◄back to faultcode library page

 DTC                   Description           Possible Cause        Diagnosis
____________________________________________________________________________________________________

: P1000 - Monitor        : The on board           : *  Vehicle is new from : The DTC does not need  :
: Testing Not Complete   : diagnostic II (OBD II) :    the factory         : to be cleared from the :
:                        : monitors are performed : *  Battery or PCM had  : PCM except to pass an  :
:                        : during the OBD II      :    recently been       : inspection/maintenance :
:                        : Drive Cycle. The DTC   :    disconnected        : test.                  :
:                        : will be stored in      : *  An OBD II monitor   :
:                        : continuous memory if   :    failure had         :
:                        : any of the OBD II      :    occurred before     :
:                        : monitors do not        :    completion of an    :
:                        : complete.              :    OBD II drive cycle  :
:                        :                        : *  PCM DTCs have       :
:                        :                        :    recently been       :
:                        :                        :    cleared with a scan :
:                        :                        :    tool                :
:                        :                        : *  PTO circuit is      :
:                        :                        :    shorted to VPWR or  :
:                        :                        :    B+ or PTO is on     :
:                        :                        :    during testing      :
____________________________________________________________________________________________________

: P1001 - KOER Not Able  : This Non-MIL           : *  Incorrect Self-Test : Rerun Self-Test        :
: To Complete, KOER      : (Malfunction Indicator :    Procedure.          : following QT1 in       :
: Aborted                : Lamp) code will be set : *  Unexpected response : Section 3, Symptom     :
:                        : when Key On Engine     :    from Self-Test      : Charts, STEP 1: PCM    :
:                        : Running (KOER) Self    :    monitors.           : Quick Test.            :
:                        : -Test does not         : *  rpm out of          :
:                        : complete in the time   :    specification.      :
:                        : intended.              :
____________________________________________________________________________________________________

: P1100 - Mass Air Flow  : The MAF sensor circuit : *  Poor continuity     : While accessing the    :
: (MAF) Sensor           : is monitored by the    :    through the MAF     : MAF V PID on the scan  :
: Intermittent           : PCM for sudden voltage :    sensor connectors   : tool, lightly tap on   :
:                        : (or air flow) input    : *  Poor continuity     : the MAF sensor or      :
:                        : change through the     :    through the MAF     : wiggle the MAF sensor  :
:                        : comprehensive          :    sensor harness      : connector and harness. :
:                        : component monitor      : *  Intermittent open   : If the MAF V PID       :
:                        : (CCM). If during the   :    or short inside the : suddenly changes below :
:                        : last 40 warm-up cycles :    MAF sensor.         : 0.23 volt or above     :
:                        : in key ON engine       :                        : 4.60 volts, an         :
:                        : running the PCM        :                        : intermittent fault is  :
:                        : detects a voltage (or  :                        : indicated.             :
:                        : air flow) change       :
:                        : beyond the minimum or  :
:                        : maximum calibrated     :
:                        : limit, a continuous    :
:                        : memory diagnostic      :
:                        : trouble code (DTC) is  :
:                        : stored.                :
____________________________________________________________________________________________________

: P1101 - Mass Air Flow  : The MAF sensor circuit : *  Low battery charge  : A MAF V PID reading    :
: (MAF) Sensor Out of    : is monitored by the    : *  MAF sensor          : greater than 0.27      :
: Self-Test Range        : PCM for an out of      :    partially connected : volts (KOEO) or a MAF  :
:                        : range air flow (or     : *  MAF sensor          : V PID reading outside  :
:                        : voltage) input. If     :    contamination       : the 0.46 volt to 2.44  :
:                        : during key ON engine   : *  PWR GND open to MAF : volts range (KOER)     :
:                        : OFF the air flow (or   :    sensor              : indicates a hard       :
:                        : voltage) reading is    : *  MAF RTN circuit     : fault.                 :
:                        : greater than (grams    :    open to PCM         :
:                        : /second equivalent     : *  Damaged MAF sensor  :
:                        : chart in pinpoint test : *  Damaged PCM         :
:                        : DC [0.27 volt]), the   :
:                        : test fails. Likewise,  :
:                        : if during key ON       :
:                        : engine running an air  :
:                        : flow (or voltage)      :
:                        : reading is not within  :
:                        : (gram/second           :
:                        : equivalent chart in    :
:                        : pinpoint test DC [0.46 :
:                        : volt to 2.44 volts]),  :
:                        : the test fails.        :
____________________________________________________________________________________________________

: P1109 - Intake Air     : Indicates IAT2 circuit : *  Damaged harness     : Monitor IAT2 on scan   :
: Temperature 2 Sensor   : became intermittently  : *  Damaged sensor      : tool, look for sudden  :
: Intermittent           : open or shorted while  : *  Damaged harness     : changes in reading     :
:                        : engine was running.    :    connector           : when harness is        :
:                        :                        : *  Damaged PCM         : wiggled or sensor is   :
:                        :                        :                        : tapped.                :
____________________________________________________________________________________________________

: P1112 - Intake Air     : Indicates IAT sensor   : *  Damaged harness     : Monitor IAT on scan    :
: Temperature (IAT)      : signal was             : *  Damaged sensor      : tool, look for sudden  :
: Sensor Intermittent    : intermittent during    : *  Damaged harness     : changes in reading     :
:                        : the comprehensive      :    connector           : when harness is        :
:                        : component monitor.     : *  Damaged PCM         : wiggled or sensor is   :
:                        :                        :                        : tapped.                :
____________________________________________________________________________________________________

: P1114 - Intake Air     : Indicates the sensor   : *  Grounded circuit in : Monitor IAT2 PID.      :
: Temperature 2 Circuit  : signal is less than    :    harness             : Typical IAT2           :
: Low Input              : Self-Test minimum. The : *  Improper harness    : temperature should be  :
:                        : IAT2 sensor minimum is :    connection          : greater than IAT1.     :
:                        : 0.2 volts.             : *  Damaged sensor      : Refer to Section 6:    :
:                        :                        : *  Damaged PCM         : Reference Values for   :
:                        :                        :                        : ranges.                :
____________________________________________________________________________________________________

: P1115 - Intake Air     : Indicates the sensor   : *  Open circuit in     : Monitor IAT2 PID.      :
: Temperature 2 Circuit  : signal is greater than :    harness             : Typical IAT2           :
: High Input             : Self-Test maximum. The : *  Sensor signal short : temperature should be  :
:                        : IAT2 sensor maximum is :    to power            : greater than IAT1.     :
:                        : 4.6 volts.             : *  Improper harness    : Refer to Section 6:    :
:                        :                        :    connection          : Reference Values for   :
:                        :                        : *  Damaged sensor      : ranges.                :
:                        :                        : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1116 - Engine Coolant : Indicates the ECT      : *  Overheating         : Engine coolant         :
: Temperature (ECT)      : sensor is out of Self  :    condition           : temperature must be    :
: Sensor Out of Self     : -Test range. Correct   : *  Malfunctioning      : greater than 10øC      :
: -Test Range            : range is 0.3 to 3.7    :    thermostat          : (50øF) to pass the     :
:                        : volts.                 : *  Damaged ECT sensor  : KOEO Self-Test and     :
:                        :                        : *  Low engine coolant  : greater than 82øC      :
:                        :                        : *  Damaged harness     : (180øF) to pass the    :
:                        :                        :    connector           : KOER Self-Test.        :
:                        :                        : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1117 - Engine Coolant : Indicates ECT circuit  : *  Damaged harness     : -  Monitor ECT on scan :
: Temperature (ECT)      : became intermittently  : *  Damaged sensor      :    tool, look for      :
: Sensor Intermittent    : open or shorted while  : *  Damaged PCM         :    sudden changes in   :
:                        : engine was running.    : *  Damaged harness     :    reading when        :
:                        :                        :    connector           :    harness is wiggled  :
:                        :                        : *  Low engine coolant  :    or sensor is        :
:                        :                        :                        :    tapped.             :
____________________________________________________________________________________________________

: P1120 - Throttle       : The TP sensor circuit  : *  TP circuit with     : A TP PID (TP V PID)    :
: Position (TP) Sensor   : is monitored by the    :    frayed wires        : between 3.42 and 9.85% :
: Out of Range Low       : PCM for a low TP       : *  Corrosion on TP     : (0.17 and 0.49 volt)   :
: (RATCH too Low)        : rotation angle (or     :    circuit connectors  : in key ON engine OFF,  :
:                        : voltage) input below   : *  VREF open to TP     : continuous memory or   :
:                        : the closed throttle    :    sensor              : key ON engine running  :
:                        : position through the   : *  VREF short to SIG   : indicates a hard       :
:                        : comprehensive          :    RTN                 : fault.                 :
:                        : component monitor      : *  TP sensor loose     :
:                        : (CCM). If during key   :    pins                :
:                        : ON engine OFF or key   :
:                        : ON engine running the  :
:                        : TP rotation angle (or  :
:                        : voltage) remains       :
:                        : within the calibrated  :
:                        : self-test range but    :
:                        : falls between 3.42 and :
:                        : 9.85% (0.17 and 0.49   :
:                        : volt), the test fails. :
____________________________________________________________________________________________________

: P1121 - Throttle       : The PCM monitors a     : *  Air leak between    : Drive vehicle and      :
: Position (TP) Sensor   : vehicle operation      :    MAF sensor and      : exercise throttle and  :
: Inconsistent with MAF  : rationality check by   :    throttle body       : TP sensor in all       :
: Sensor                 : comparing sensed       : *  TP sensor not       : gears. A TP PID (TP V  :
:                        : throttle position to   :    seated properly     : PID) less than 4.82 %  :
:                        : mass air flow          : *  Damaged TP sensor   : (0.24 volt) with a     :
:                        : readings. If during    : *  Damaged MAF sensor  : LOAD PID greater than  :
:                        : key ON engine running  :                        : 55% or a TP V PID      :
:                        : self-test the          :                        : greater than 49.05%    :
:                        : comparison of the TP   :                        : (2.44 volts) with a    :
:                        : sensor and MAF sensor  :                        : LOAD PID less than 30% :
:                        : readings are not       :                        : indicates a hard       :
:                        : consistent with        :                        : fault.                 :
:                        : calibrated load values :
:                        : , the test fails and a :
:                        : diagnostic trouble     :
:                        : code is stored in      :
:                        : continuous memory.     :
____________________________________________________________________________________________________

: P1124 - Throttle       : The TP sensor circuit  : *  Binding or bent     : A TP PID (TP V PID)    :
: Position (TP) Sensor   : is monitored by the    :    throttle linkage    : reading not between    :
: Out of Self-Test Range : PCM for an out of      : *  TP sensor not       : 13.27 and 23.52% (0.66 :
:                        : range TP rotation      :    seated properly     : and 1.17 volts) in key :
:                        : angle (or voltage)     : *  Throttle plate      : ON engine OFF or key   :
:                        : input. If during key   :    below closed        : ON engine running      :
:                        : ON engine OFF or key   :    throttle position   : indicates a hard       :
:                        : ON engine running the  : *  Throttle plate      : fault.                 :
:                        : TP rotation angle (or  :    /screw misadjusted  :
:                        : voltage) reading is    : *  Damaged TP sensor   :
:                        : less than 13.27% (0.66 : *  Damaged PCM         :
:                        : volt) or greater than  :
:                        : 23.52% (1.17 volts),   :
:                        : the test fails.        :
____________________________________________________________________________________________________

: P1125 - Throttle       : The TP sensor circuit  : *  Poor continuity     : While accessing the TP :
: Position (TP) Sensor   : is monitored by the    :    through the TP      : V PID on the scan tool :
: Intermittent           : PCM for sudden TP      :    sensor connectors   : , lightly tap on the   :
:                        : rotation angle (or     : *  Poor continuity     : TP sensor or wiggle    :
:                        : voltage) input change  :    through the TP      : the TP sensor          :
:                        : through the            :    harness             : connector and harness. :
:                        : comprehensive          : *  Intermittent open   : If the TP V PID        :
:                        : component monitor      :    or short inside the : suddenly changes below :
:                        : (CCM). If during the   :    TP sensor           : 0.49 volt or above     :
:                        : last 80 warm-up cycles :                        : 4.65 volts, an         :
:                        : in key ON engine       :                        : intermittent fault is  :
:                        : running the PCM        :                        : indicated.             :
:                        : detects a TP rotation  :
:                        : angle (or voltage)     :
:                        : changes beyond the     :
:                        : minimum or maximum     :
:                        : calibrated limit, a    :
:                        : continuous diagnostic  :
:                        : trouble code (DTC) is  :
:                        : stored.                :
____________________________________________________________________________________________________

: P1127 - Exhaust Not    : The HEGO monitor uses  : *  Engine not          : Monitor HO2S Heater    :
: Warm Enough,           : an exhaust temperature :    operating long      : PIDs to determine      :
: Downstream Sensor Not  : model to determine     :    enough prior to     : their ON/OFF state.    :
: Tested                 : when the HO2S heaters  :    performing KOER     : DTC P1127 will be      :
:                        : are cycled ON. The     :    self-test.          : present if the exhaust :
:                        : test fails when the    : *  Exhaust system too  : is not hot.            :
:                        : inferred exhaust       :    cool.               :
:                        : temperature is below a :
:                        : minimum calibrated     :
:                        : value.                 :
____________________________________________________________________________________________________

: P1128 - Upstream       : The HEGO monitor       : *  Crossed HO2S        :
: Oxygen Sensors Swapped : checks and determines  :    harness connectors  :
: from Bank to Bank      : if the HO2S signal     :    (upstream).         :
: (HO2S-11-21)           : response for a fuel    : *  Crossed HO2S wiring :
:                        : shift corresponds to   :    at the harness      :
:                        : the correct engine     :    connectors          :
:                        : bank. The test fails   :    (upstream).         :
:                        : when a response from   : *  Crossed HO2S wiring :
:                        : the HO2S(s) being      :    at the 104-pin      :
:                        : tested is not          :    harness connectors  :
:                        : indicated.             :    (upstream).         :
____________________________________________________________________________________________________

: P1129 - Downstream     : The HEGO monitor       : *  Crossed HO2S        :
: Oxygen Sensors Swapped : checks and determines  :    harness connectors  :
: from Bank to Bank      : if the HO2S signal     :    (downstream).       :
: (HO2S-12-22)           : response for a fuel    : *  Crossed HO2S wiring :
:                        : shift corresponds to   :    at the harness      :
:                        : the correct engine     :    connectors          :
:                        : bank. The test fails   :    (downstream).       :
:                        : when a response from   : *  Crossed HO2S wiring :
:                        : the HO2S(s) being      :    at the 104-pin      :
:                        : tested is not          :    harness connectors  :
:                        : indicated.             :    (downstream).       :
____________________________________________________________________________________________________

: P1130 - Lack of HO2S   : The HEGO Sensor is     :    Electrical:         : A fuel control HO2S    :
: -11 Switch, Fuel Trim  : monitored for          :   *  Short to VPWR in  : PID switching across   :
: at Limit               : switching. The test    :      harness or HO2S   : 0.45 volt from 0.2 to  :
:                        : fails when the HO2S    :   *  Water in harness  : 0.9 volt indicates a   :
:                        : fails to switch due to :      connector         : normal switching HO2S. :
:                        : circuit or fuel at or  :   *  Open/Shorted HO2S :
:                        : exceeding a calibrated :      circuit           :
:                        : limit.                 :   *  Corrosion or poor :
:                        :                        :      mating terminals  :
:                        :                        :      and wiring        :
:                        :                        :   *  Damaged HO2S      :
:                        :                        :   *  Damaged PCM       :
:                        :                        :    Fuel System:        :
:                        :                        :   *  Excessive fuel    :
:                        :                        :      pressure          :
:                        :                        :   *  Leaking           :
:                        :                        :      /contaminated     :
:                        :                        :      fuel injectors    :
:                        :                        :   *  Leaking fuel      :
:                        :                        :      pressure          :
:                        :                        :      regulator         :
:                        :                        :   *  Low fuel pressure :
:                        :                        :      or running out of :
:                        :                        :      fuel              :
:                        :                        :   *  Vapor recovery    :
:                        :                        :      system            :
:                        :                        :    Induction System:   :
:                        :                        :   *  Air leaks after   :
:                        :                        :      the MAF           :
:                        :                        :   *  Vacuum Leaks      :
:                        :                        :   *  PCV system        :
:                        :                        :   *  Improperly seated :
:                        :                        :      engine oil        :
:                        :                        :      dipstick          :
:                        :                        :    EGR System:         :
:                        :                        :   *  Leaking gasket    :
:                        :                        :   *  Stuck EGR valve   :
:                        :                        :   *  Leaking diaphragm :
:                        :                        :      or EVR            :
:                        :                        :    Base Engine:        :
:                        :                        :   *  Oil overfill      :
:                        :                        :   *  Cam timing        :
:                        :                        :   *  Cylinder          :
:                        :                        :      compression       :
:                        :                        :   *  Exhaust leaks     :
:                        :                        :      before or near    :
:                        :                        :      the HO2S(s)       :
____________________________________________________________________________________________________


: P1131 - Lack of HO2S   : A HEGO sensor          : See Possible Causes    :
: -11 Switch, Sensor     : indicating lean at the : for DTC P1130          :
: Indicates Lean         : end of a test is       :
:                        : trying to correct for  :
:                        : an over-rich           :
:                        : condition. The test    :
:                        : fails when the fuel    :
:                        : control system no      :
:                        : longer detects         :
:                        : switching for a        :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1132 - Lack of HO2S   : A HEGO sensor          : See Possible Causes    :
: -11 Switch, Sensor     : indicating rich at the : for DTC P1130          :
: Indicates Rich         : end of a test is       :
:                        : trying to correct for  :
:                        : an over-lean           :
:                        : condition. The test    :
:                        : fails when the fuel    :
:                        : control system no      :
:                        : longer detects         :
:                        : switching for a        :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1137 - Lack of HO2S   : The downstream HO2S    : *  Pinched, shorted,   :
: -12 Switch, Sensor     : sensors are forced     :    and corroded wiring :
: Indicates Lean         : rich and lean and      :    and pins            :
:                        : monitored by the PCM.  : *  Crossed sensor      :
:                        : The test fails if the  :    wires               :
:                        : PCM does not detect    : *  Exhaust leaks       :
:                        : the output of the HO2S : *  Contaminated or     :
:                        : in a calibrated amount :    damaged sensor      :
:                        : of time.               :
____________________________________________________________________________________________________

: P1138 - Lack of HO2S   : See DTC P1137          :
: -12 Switch, Sensor     :
: Indicates Rich         :
____________________________________________________________________________________________________

: P1150 - Lack of HO2S   : See DTC P1130          :
: -21 Switch, Fuel Trim  :
: at Limit               :
____________________________________________________________________________________________________

: P1151 - Lack of HO2S   : A HEGO sensor          : See Possible Causes    :
: -21 Switch, Sensor     : indicating lean at the : for DTC P1130          :
: Indicates Lean         : end of a test is       :
:                        : trying to correct for  :
:                        : an over-rich           :
:                        : condition. The test    :
:                        : fails when fuel        :
:                        : control system no      :
:                        : longer detects         :
:                        : switching for a        :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1152 - Lack of HO2S   : A HEGO sensor          : See Possible Causes    :
: -21 Switch, Sensor     : indicating rich at the : for DTC P1130          :
: Indicates Rich         : end of a test is       :
:                        : trying to correct for  :
:                        : an over-lean           :
:                        : condition. The test    :
:                        : fails when the fuel    :
:                        : control system no      :
:                        : longer detects         :
:                        : switching for a        :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1157 - Lack of HO2S   : See DTC P1137          :
: -22 Switch, Sensor     :
: Indicates Lean         :
____________________________________________________________________________________________________

: P1158 - Lack of HO2S   : See DTC P1137          :
: -22 Switch, Sensor     :
: Indicates Rich         :
____________________________________________________________________________________________________

: P1168 - Fuel Rail      : The comprehensive      : *  Low fuel pressure   :    A FRP PID value     :
: Pressure Sensor in     : component monitor      : *  Damaged FRP sensor  :    below 551 kpa (80   :
: Range But Low          : (CCM) monitors the FRP : *  Excessive           :    psi) indicates a    :
:                        : pressure for           :    resistance in       :    failure             :
:                        : acceptable fuel        :    circuit             :   *  Low or no fuel    :
:                        : pressure. The test     : *  Low or no fuel      :    A FRP PID value     :
:                        : fails when the fuel    :                        :    greater than 896    :
:                        : pressure falls below a :                        :    kpa (130 psi)       :
:                        : calibrated value.      :                        :    indicates a failure :
____________________________________________________________________________________________________

: P1169 - Fuel Rail      : The comprehensive      : *  High fuel pressure  :
: Pressure (FRP) Sensor  : component monitor      : *  Low fuel pressure   :
: in Range But High      : (CCM) monitors the FRP : *  Damaged FRP sensor  :
:                        : pressure for           : *  Excessive           :
:                        : acceptable fuel        :    resistance in       :
:                        : pressure. The test     :    circuit             :
:                        : fails when the fuel    :
:                        : pressure falls below   :
:                        : or exceeds a minimum   :
:                        : /maximum calibrated    :
:                        : value for a calibrated :
:                        : period of time.        :
____________________________________________________________________________________________________

: P1180 - Fuel Delivery  : The PCM receives fuel  : *  Restriction in the  :
: System - Low           : tank pressure (FTP)    :    fuel line           :
:                        : information from the   : *  Plugged fuel filter :
:                        : natural gas module     :
:                        : (NG), which uses the   :
:                        : information to infer   :
:                        : fuel rail pressure     :
:                        : (FRP). The test fails  :
:                        : when the inferred      :
:                        : pressure is less than  :
:                        : a minimum calibrated   :
:                        : value.                 :
____________________________________________________________________________________________________

: P1181 - Fuel Delivery  : The PCM receives fuel  : *  Fuel pressure       :
: System - High          : tank pressure (FTP)    :    regulator           :
:                        : information from the   :
:                        : natural gas module     :
:                        : (NG), which uses the   :
:                        : information to infer   :
:                        : fuel rail pressure     :
:                        : (FRP). The test fails  :
:                        : when the inferred      :
:                        : pressure is higher     :
:                        : than a maximum         :
:                        : calibrated value.      :
____________________________________________________________________________________________________

: P1183 - Engine Oil     : Indicates EOT circuit  : *  Damaged harness     : Using signal           :
: Temperature (EOT)      : became intermittently  : *  Damaged sensor      : simulation, disconnect :
: Sensor Circuit         : open or shorted while  : *  Damaged harness     : sensor and simulate    :
: Malfunction            : engine was running.    :    connector           : 1.0V on sensor signal  :
:                        :                        : *  Damaged PCM         : circuit. Simulated     :
:                        :                        :                        : 1.0V signal and scan   :
:                        :                        :                        : PID voltage value      :
:                        :                        :                        : should be similar. If  :
:                        :                        :                        : voltage is similar     :
:                        :                        :                        : check sensor, if       :
:                        :                        :                        : voltage is not similar :
:                        :                        :                        : check related circuit  :
:                        :                        :                        : and PCM.               :
____________________________________________________________________________________________________

: P1184 - Engine Oil     : Indicates EOT signal   : *  Damaged harness     : Using signal           :
: Temperature (EOT)      : was out of Self-Test   : *  Damaged sensor      : simulation, disconnect :
: Sensor Out of Self     : range. Correct range   : *  Damaged harness     : sensor and simulate    :
: -Test Range            : for KOER is.3-1.2      :    connector           : 1.0V on sensor signal  :
:                        : volts.                 : *  Damaged PCM         : circuit. Simulated     :
:                        :                        :                        : 1.0V signal and scan   :
:                        :                        :                        : PID voltage value      :
:                        :                        :                        : should be similar. If  :
:                        :                        :                        : voltage is similar     :
:                        :                        :                        : check sensor, if       :
:                        :                        :                        : voltage is not similar :
:                        :                        :                        : check related circuit  :
:                        :                        :                        : and PCM.               :
____________________________________________________________________________________________________

: P1229 - Supercharger   : The ICP DTC will be    : *  Pump motor open     : Check for voltage at   :
: Intercooler Pump (ICP) : set when the PCM is    :    circuited           : relay, check fuse in   :
: Pump Not Operating     : calling for the pump   : *  Pump relay coil     : power feed, check      :
:                        : to be operating but no :    open                : ground connection of   :
:                        : current is being       : *  Open circuit        : pump motor, PID        :
:                        : detected.              :    between relay and   : reading is on/off.     :
:                        :                        :    pump                :
:                        :                        : *  Damaged PCM         :
:                        :                        : *  Pump motor shorted  :
:                        :                        : *  Open circuit        :
:                        :                        :    between PCM and     :
:                        :                        :    relay               :
:                        :                        : *  Poor pump ground    :
:                        :                        :    connection          :
____________________________________________________________________________________________________

: P1232 - Low Speed Fuel : Monitors the low speed : *  Open or shorted low : -  An open circuit or  :
: Pump Primary Circuit   : fuel pump (LFP)        :    fuel pump (LFP)     :    short to ground can :
: Malfunction            : primary circuit output :    circuit             :    only be detected    :
:                        : from the PCM. The test : *  Open VPWR to low    :    with the low speed  :
:                        : fails if: When the LFP :    speed fuel pump     :    fuel pump.          :
:                        : circuit is commanded   :    relay               : -  A short to power    :
:                        : on (grounded),         : *  Damaged low speed   :    can only be         :
:                        : excessive current draw :    fuel pump relay     :    detected with the   :
:                        : is detected on the LFP : *  Damaged PCM         :    low speed fuel pump :
:                        : circuit; or when the   :                        :    commanded on.       :
:                        : LFP circuit is         :                        : -  During KOEO and     :
:                        : commanded off, voltage :                        :    KOER Self-Test, the :
:                        : is not detected on the :                        :    low speed fuel pump :
:                        : LFP circuit (the PCM   :                        :    output command will :
:                        : expects to detect VPWR :                        :    be cycled on and    :
:                        : voltage coming through :                        :    off.                :
:                        : the low speed fuel     :
:                        : pump relay coil to the :
:                        : LFP circuit).          :
____________________________________________________________________________________________________

: P1233 - Fuel System    : Note: For LS6/LS8,     : *  Inertia fuel        : The PCM expects to see :
: Disabled or Offline    : P1233 indicates the    :    shutoff (IFS)       : one of the following   :
:                        : PCM is not receiving   :    switch needs to be  : duty cycle signals     :
:                        : the fuel level         :    reset               : from the FPDM on the   :
:                        : information on SCP     : *  Open FPDM ground    : FPM circuit: 1) 50%    :
:                        : from the rear          :    circuit             : (500 msec on, 500 msec :
:                        : electronics module     : *  Open or shorted FPM : off), all OK. 2) 25%   :
:                        : (REM). Refer to the    :    circuit             : (250 msec on, 750 msec :
:                        : Workshop Manual        : *  Damaged IFS switch  : off), FPDM did not     :
:                        : Section 413-01 for     : *  Damaged FPDM        : receive a fuel pump    :
:                        : diagnostics. Monitors  : *  Damaged PCM         : (FP) duty cycle        :
:                        : the fuel pump monitor  :   -  Also for Escort   : command from the PCM,  :
:                        : (FPM) circuit from the :      /Tracer and       : or the duty cycle that :
:                        : fuel pump driver       :      Mustang:          : was received was       :
:                        : module (FPDM). With    :   -  Open FPDM PWR     : invalid. 3) 75% (750   :
:                        : the key on, the FPDM   :      circuit           : msec ON, 250 OFF), the :
:                        : continuously sends a   :   -  Open B+ circuit   : FPDM has detected a    :
:                        : duty cycle signal to   :      to constant       : fault in the circuits  :
:                        : the PCM through the    :      control relay     : between the FPDM and   :
:                        : FPM circuit. The test  :      module (CCRM) pin : the fuel pump.         :
:                        : fails if the PCM stops :      11                :
:                        : receiving the duty     :   -  Open ground to    :
:                        : cycle signal.          :      CCRM pin 18       :
:                        :                        :      (Mustang)         :
:                        :                        :   -  Damaged CCRM      :
:                        :                        :   -   Also for         :
:                        :                        :      Continental:      :
:                        :                        :   -  Open VPWR circuit :
:                        :                        :      to FPDM           :
____________________________________________________________________________________________________

: P1234 - Fuel System    : See DTC P1233. P1234   :
: Disabled or Offline    : is identical to P1233  :
:                        : except P1234 will not  :
:                        : illuminate the MIL.    :
____________________________________________________________________________________________________

: P1235 - Fuel Pump      : Note: For LS6/LS8, the : *  FP circuit open or  : The FPDM sends a 25%   :
: Control Out Of Range   : FPDM functions are     :    shorted             : duty cycle (250 msec   :
:                        : incorporated in the    : *  Damaged FPDM.       : ON, 750 msec OFF)      :
:                        : Rear Electronics       : *  Damaged PCM         : through the FPM        :
:                        : Module (REM). Also,    :                        : circuit to the PCM     :
:                        : the REM does not use a :                        : while the fault is     :
:                        : FPM circuit.           :                        : being detected by the  :
:                        : Diagnostic information :                        : FPDM. If the fault is  :
:                        : will be sent through   :                        : no longer detected,    :
:                        : SCP. Indicates that    :                        : the PDM will return to :
:                        : the FPDM has detected  :                        : sending an "all OK"    :
:                        : an invalid or missing  :                        : (50% duty cycle)       :
:                        : FP circuit signal from :                        : message to the PCM.    :
:                        : the PCM. The FPDM will :                        : The PCM will keep      :
:                        : send a message to the  :                        : P1235 stored in        :
:                        : PCM through the FPM    :                        : Continuous Memory.     :
:                        : circuit, indicating    :
:                        : that this failure has  :
:                        : been detected. The PCM :
:                        : will set the DTC when  :
:                        : the message is         :
:                        : received.              :
____________________________________________________________________________________________________

: P1236 - Fuel Pump      : See DTC P1235. P1236   :
: Control Out Of Range   : is identical to P1235  :
:                        : except P1236 will not  :
:                        : illuminate the MIL.    :
____________________________________________________________________________________________________

: P1237 - Fuel Pump      : Note: For LS6/LS8, the : *  Open or shorted FP  : -  The FPDM sends a    :
: Secondary Circuit      : FPDM functions are     :    PWR circuit         :    75% duty cycle (750 :
: Malfunction            : incorporated in the    : *  Open FP Rtn circuit :    msec ON, 250 msec   :
:                        : rear electronics       :    to FPDM             :    OFF) through the    :
:                        : module (REM). Also,    : *  Open or shorted     :    FPM circuit to the  :
:                        : the REM does not use a :    circuit in the fuel :    PCM while the fault :
:                        : FPM circuit.           :    pump                :    is being detected   :
:                        : Diagnostic information : *  Locked fuel pump    :    by the FPDM. If the :
:                        : will be set through    :    rotor               :    fault is no longer  :
:                        : SCP. Indicates that    : *  Damaged FPDM        :    detected, the PCM   :
:                        : the FPDM has detected  : *  For LS6/LS8,        :    will return to      :
:                        : a fuel pump secondary  :    circuits associated :    sending an "all OK" :
:                        : circuit fault. The     :    with the Fuel Pump  :    (50% duty cycle)    :
:                        : FPDM will send a       :    relay               :    message to the PCM. :
:                        : message to the PCM     :                        :    The PCM will keep   :
:                        : through the FPM        :                        :    P1237 stored in     :
:                        : circuit, indicating    :                        :    Continuous Memory.  :
:                        : that this failure has  :                        : -  The FPDM controls   :
:                        : been detected. The PCM :                        :    pump speed by       :
:                        : will set the DTC when  :                        :    supplying a         :
:                        : the message is         :                        :    "variable" ground   :
:                        : received.              :                        :    on the RTN circuit. :
____________________________________________________________________________________________________

: P1238 - Fuel Pump      : See DTC P1237. P1238   :
: Secondary Circuit      : is identical to P1237  :
: Malfunction            : except P1238 will not  :
:                        : illuminate the MIL.    :
____________________________________________________________________________________________________

: P1244 - Generator Load : The PCM monitors the   : *   ALI circuit open   : Verify operation of    :
: Input Low              : GLI circuit, and will  :    or short            : charging system.       :
:                        : set the DTC when the   : *   Damaged voltage    :
:                        : input is below         :    regulator/generator :
:                        : calibrated limit for a : *   Damaged PCM        :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1245 - Generator Load : The PCM monitors the   : *  ALI circuit open or : Verify operation of    :
: Input High             : GLI circuit, and will  :    short               : charging system.       :
:                        : set the DTC when the   : *  Damaged voltage     :
:                        : input is above a       :    regulator/generator :
:                        : calibrated limit for a : *  Damaged PCM         :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1246 - Generator Load : The PCM monitors the   : *  ALI circuit         : *  Verify operation of :
: Input (2.0L Contour    : GLI circuit, and will  :    concern.            :    charging system.    :
: /Mystique/Cougar)      : set the DTC when the   : *  Damaged voltage     : *  Verify battery is   :
:                        : input is not within a  :    regulator/generator :    at proper charge.   :
:                        : calibrated limit for a : *  Damaged PCM.        :
:                        : calibrated amount of   :
:                        : time.                  :
____________________________________________________________________________________________________

: P1246 - Generator Load : The PCM monitors       : *  Generator circuit   : -  Verify battery      :
: Input Failed (All      : generator load from    :    short to GND        :    voltage is 14.5V.   :
: Others)                : the generator          : *  Generator circuit   : -  Verify generator    :
:                        : /regulator in the form :    short to PWR        :    /regulator has the  :
:                        : of frequency. The      : *  Generator circuit   :    correct part        :
:                        : frequency range is     :    open                :    number.             :
:                        : determined by the      : *  Generator drive     :
:                        : temperature of the     :    mechanism           :
:                        : voltage regulator      : *  Damaged generator   :
:                        : where 97% represents   :    /regulator assembly :
:                        : full load, below 6%    : *  Damaged PCM         :
:                        : means no load.         :
____________________________________________________________________________________________________

: P1260 - Theft Detected : Indicates that the     : *  Previous theft      : Theft indicator        :
: - Vehicle Immobilized  : passive anti-theft     :    condition           : flashing rapidly or on :
:                        : system (PATS) has      : *  Anti-Theft System   : solid when ignition    :
:                        : determined a theft     :    failure             : switch is in the ON    :
:                        : condition existed and  :                        : position. Check anti   :
:                        : the engine is          :                        : -theft system for      :
:                        : disabled. This DTC is  :                        : DTCs. Typical vehicle  :
:                        : a good indicator to    :                        : symptoms are: Start    :
:                        : check the PATS for     :                        : /Stall or Crank/No     :
:                        : DTCs.                  :                        : Start. NOTE: No crank  :
:                        :                        :                        : symptom only on        :
:                        :                        :                        : vehicles equipped with :
:                        :                        :                        : PATS starter disable   :
:                        :                        :                        : feature.               :
____________________________________________________________________________________________________

: P1270 - Engine RPM     : Indicates the vehicle  : *  Wheel slippage      : The DTC indicates the  :
: /Vehicle Speed Limiter : has been operated in a :    (water, ice, mud    : vehicle has been       :
:                        : manner which caused    :    and snow)           : operated in a manner   :
:                        : the engine or vehicle  : *  Excessive engine    : which caused the       :
:                        : to exceed a            :    rpm in Neutral      : engine or vehicle      :
:                        : calibration limit. The : *  Vehicle drive at a  : speed to exceed a      :
:                        : engine rpm and vehicle :    high rate of speed  : calibrated limit.      :
:                        : speed are continuously :
:                        : monitored by the PCM.  :
:                        : The DTC is set when    :
:                        : the rpm or speed fall  :
:                        : out of calibrated      :
:                        : range. For additional  :
:                        : information on the     :
:                        : engine rpm/vehicle     :
:                        : speed limiter, refer   :
:                        : to Section 1,          :
:                        : Electronic Engine      :
:                        : Control (EC) System,   :
:                        : Powertrain Control     :
:                        : Software.              :
____________________________________________________________________________________________________

: P1285 - Cylinder Head  : Indicates an engine    : *  Low engine coolant  : On some applications   :
: Over Temperature       : overheat condition was :    level               : when this fault occurs :
: Sensed                 : sensed by the cylinder : *  Base engine         : the Engine Temperature :
:                        : head temperature       :    concerns            : warning indicator will :
:                        : sensor.                : *  Engine cooling      : illuminate and force   :
:                        :                        :    system concerns     : the temperature gauge  :
:                        :                        : *  CHT sensor concern  : to full H (Hot) zone   :
:                        :                        :                        : by ground circuit 39.  :
____________________________________________________________________________________________________

: P1288 - Cylinder Head  : Indicates the CHT      : *  Cold engine         : Bring engine to        :
: Temperature (CHT)      : sensor is out of Self  : *  Engine overheating  : operating temperature. :
: Sensor Circuit Out of  : -Test range. Engine    : *  Damaged harness     : If cold, re-run self   :
: Self-Test Range        : not at operating       :    connector           : -test. If engine over  :
:                        : temperature.           : *  Damaged PCM         : -heats check cooling   :
:                        :                        : *  Low engine coolant  : system.                :
:                        :                        :    level               :
:                        :                        : *  Damaged CHT sensor  :
____________________________________________________________________________________________________

: P1289 - Cylinder Head  : Indicates a CHT sensor : *   Grounded circuit   : Using signal           :
: Temperature (CHT)      : circuit malfunction    :    in CHT harness      : simulation, disconnect :
: Sensor Circuit High    : (shorted).             : *   Damaged CHT sensor : sensor and simulate a  :
: Input (PCM STRATEGIES  :                        : *   Improper harness   : voltage on sensor      :
: UP TO AND INCLUDING    :                        :    connection          : signal circuit.        :
: 1998)                  :                        : *   Damaged PCM        : Simulated 1.0V signal  :
:                        :                        :                        : and scan PID voltage   :
:                        :                        :                        : value should be        :
:                        :                        :                        : similar. If voltage is :
:                        :                        :                        : similar check sensor,  :
:                        :                        :                        : if voltage is not      :
:                        :                        :                        : similar check related  :
:                        :                        :                        : circuit and PCM. Note  :
:                        :                        :                        : DTC P0117 may also be  :
:                        :                        :                        : reported, this will    :
:                        :                        :                        : activate the MIL       :
:                        :                        :                        : light.                 :
____________________________________________________________________________________________________

: P1289 - Cylinder Head  : Indicates a CHT sensor : *  Open circuit in CHT : Using signal           :
: Temperature (CHT)      : circuit malfunction    :    harness             : simulation, disconnect :
: Sensor Circuit High    : (open).                : *  Damaged CHT sensor  : sensor and simulate a  :
: Input (PCM STRATEGIES  :                        : *  Improper harness    : voltage on sensor      :
: 1999 AND BEYOND)       :                        :    connection          : signal circuit.        :
:                        :                        : *  Damaged PCM         : Simulated 1.0V signal  :
:                        :                        :                        : and scan PID voltage   :
:                        :                        :                        : value should be        :
:                        :                        :                        : similar. If voltage is :
:                        :                        :                        : similar check sensor,  :
:                        :                        :                        : if voltage is not      :
:                        :                        :                        : similar check related  :
:                        :                        :                        : circuit and PCM. Note: :
:                        :                        :                        : DTC P0118 may also be  :
:                        :                        :                        : reported, this will    :
:                        :                        :                        : activate the MIL       :
:                        :                        :                        : light.                 :
____________________________________________________________________________________________________

: P1290 - Cylinder Head  : Indicates a CHT sensor : *  Open circuit in CHT : Using signal           :
: Temperature (CHT)      : circuit malfunction    :    harness             : simulation, disconnect :
: Sensor Circuit Low     : (open).                : *  Damaged CHT sensor  : sensor and simulate a  :
: Input (PCM STRATEGIES  :                        : *  Improper harness    : voltage on sensor      :
: UP TO AND INCLUDING    :                        :    connection          : signal circuit.        :
: 1998)                  :                        : *  Damaged PCM         : Simulated 1.0V signal  :
:                        :                        :                        : and scan PID voltage   :
:                        :                        :                        : value should be        :
:                        :                        :                        : similar. If voltage is :
:                        :                        :                        : similar check sensor,  :
:                        :                        :                        : if voltage is not      :
:                        :                        :                        : similar check related  :
:                        :                        :                        : circuit and PCM. Note  :
:                        :                        :                        : DTC P0118 may also be  :
:                        :                        :                        : reported, this will    :
:                        :                        :                        : activate the MIL       :
:                        :                        :                        : light.                 :
____________________________________________________________________________________________________

: P1290 - Cylinder Head  : Indicates a CHT sensor : *  Grounded circuit in : Using signal           :
: Temperature (CHT)      : circuit malfunction    :    CHT harness         : simulation, disconnect :
: Sensor Circuit Low     : (shorted).             : *  Damaged CHT sensor  : sensor and simulate a  :
: Input (PCM STRATEGIES  :                        : *  Improper harness    : voltage on sensor      :
: 1999 AND BEYOND)       :                        :    connection          : signal circuit.        :
:                        :                        : *  Damaged PCM         : Simulated 1.0V signal  :
:                        :                        :                        : and scan PID voltage   :
:                        :                        :                        : value should be        :
:                        :                        :                        : similar. If voltage is :
:                        :                        :                        : similar check sensor,  :
:                        :                        :                        : if voltage is not      :
:                        :                        :                        : similar check related  :
:                        :                        :                        : circuit and PCM. Note  :
:                        :                        :                        : DTC P0117 may also be  :
:                        :                        :                        : reported, this will    :
:                        :                        :                        : activate the MIL       :
:                        :                        :                        : light.                 :
____________________________________________________________________________________________________

: P1299 - Cylinder Head  : Indicates an engine    : *  Engine cooling      : Refer to Section 1,    :
: Over Temperature       : overheat condition was :    system concerns     : Electronic Engine      :
: Protection Active      : detected by the        : *  Low engine coolant  : Control (EC) System,   :
:                        : cylinder head          :    level               : for more information   :
:                        : temperature (CHT)      : *  Base engine         : on Fail-safe Cooling   :
:                        : sensor. An FMEM        :    concerns            : Strategy and cylinder  :
:                        : Strategy called Fail   :                        : head temperature       :
:                        : -safe Cooling was      :                        : sensor.                :
:                        : activated to cool the  :
:                        : engine.                :
____________________________________________________________________________________________________

: P1309 - Misfire        : When the misfire       : *  Camshaft position   : Verify the CMP is      :
: Monitor Disabled       : monitor is disabled,   :    sensor              : installed correctly    :
:                        : usually due to the     : *  Powertrain control  : and not out of         :
:                        : input signal generated :    module              : synchronization.       :
:                        : by the camshaft        : *  ECT, MAF, and CKP   :
:                        : position (CMP) sensor, :    sensors             :
:                        : by sensing the passage :
:                        : of teeth from the CMP  :
:                        : wheel.                 :
____________________________________________________________________________________________________

: P1380 - Variable Cam   : The comprehensive      : *  Open or short VCT   : DTC P1380 is a VCT     :
: Timing Solenoid A      : component monitor(CCM) :    circuit             : circuit check. Testing :
: Circuit Malfunction    : monitors the VCT       : *  Open VPWR circuit   : should include wires,  :
:                        : circuit to the PCM for : *  Damaged PCM         : solenoid coil and PCM. :
:                        : high and low voltage.  : *  Open or short VCT   :
:                        : If during testing      :    solenoid valve      :
:                        : voltage was to fall    :
:                        : below a calibrated     :
:                        : limit a calibrated     :
:                        : amount of time the     :
:                        : test will fail.        :
____________________________________________________________________________________________________

: P1381 - Variable Cam   : The comprehensive      : *  Cam timing          : P1381 DTC is a check   :
: Timing Over-advanced   : component monitor      :    improperly set      : of the VCT unit.       :
: (Bank 1)               : (CCM) monitors the VCT : *  No oil flow to the  : Testing should not     :
:                        : position for an over   :    VCT piston chamber  : include electrical     :
:                        : -advanced camshaft     : *  Low oil pressure    : checks. Diagnostics    :
:                        : timing. The test fails : *  VCT solenoid valve  : and repair for the VCT :
:                        : when the camshaft      :    stuck closed        : unit are located in    :
:                        : timing exceeds a       : *  Camshaft advance    : the Workshop Manual.   :
:                        : maximum calibrated     :    mechanism binding   :
:                        : value or remains in an :    (VCT unit)          :
:                        : advanced position.     :
____________________________________________________________________________________________________

: P1383 - Variable Cam   : The comprehensive      : *  Cam timing          : DTC P1383 is a check   :
: Timing Over-retarded   : component monitor      :    improperly set      : of the VCT unit.       :
: (Bank 1)               : (CCM) monitors the VCT : *  Continuous oil flow : Testing should not     :
:                        : position for over      :    to the VCT piston   : include electrical     :
:                        : -retarded camshaft     :    chamber             : checks. Engine will    :
:                        : timing. The test fails : *  VCT solenoid valve  : idle rough, hard       :
:                        : when the camshaft      :    stuck open          : starting and may       :
:                        : timing exceeds a       : *  Camshaft advance    : stall. Diagnostics and :
:                        : maximum calibrated     :    mechanism binding   : repair for the VCT     :
:                        : value or remains in an :    (VCT unit)          : unit are located in    :
:                        : retarded position.     :                        : the Workshop Manual.   :
____________________________________________________________________________________________________

: P1390 - Octane Adjust  : The octane adjust is   : *  Powertrain control  : Do not activate the    :
: (OCTADJ)               : software activated in  :    module (PCM)        : octane adjust software :
:                        : the powertrain control :                        : unless directed by a   :
:                        : module, used to retard :                        : Technical Service      :
:                        : spark timing by three  :                        : Bulletin.              :
:                        : degrees. The hardware  :
:                        : shorting bar has been  :
:                        : removed.               :
____________________________________________________________________________________________________

: P1400 - DPF EGR Sensor : The EGR monitor checks : *  DPFEGR circuit      : A DPF EGR PID reading  :
: Circuit Low Voltage    : the DPF EGR sensor     :    short to GND        : less than 0.2 volt     :
: Detected               : signal to the PCM for  : *  Damaged DPF EGR     : with the key ON and    :
:                        : low voltage. The test  :    sensor              : engine OFF or running, :
:                        : fails when the average : *  VREF short to GND   : indicates a hard       :
:                        : voltage to the PCM     : *  Damaged PCM         : fault.                 :
:                        : drops to a voltage     :
:                        : less than the minimum  :
:                        : calibrated value.      :
____________________________________________________________________________________________________

: P1401 - DPF EGR Sensor : The EGR monitor checks : *  DPF EGR circuit     : A DPF EGR PID reading  :
: Circuit High Voltage   : the DPF EGR sensor     :    open                : greater than 4.5 volts :
: Detected               : signal to the PCM for  : *  VREF short to PWR   : with the key ON and    :
:                        : high voltage. The test : *  Damaged DPF EGR     : engine OFF or running, :
:                        : fails when the average :    sensor              : indicates a hard       :
:                        : voltage to the PCM     : *  DPFEGR circuit      : fault.                 :
:                        : goes to a voltage      :    short to PWR        :
:                        : greater than the       : *  SIG RTN circuit     :
:                        : maximum calibrated     :    open                :
:                        : value.                 : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1405 - DPF EGR Sensor : While driving, the EGR : *  Upstream hose is    : -  Look for signs of   :
: Upstream Hose Off or   : monitor commands the   :    disconnected        :    water or icing in   :
: Plugged                : EGR valve closed and   : *  Upstream hose is    :    hose                :
:                        : checks the             :    plugged (ice)       : -  Verify hose         :
:                        : differential pressure  : *  Plugged or damaged  :    connection and      :
:                        : across the EGR         :    EGR tube            :    routing (no         :
:                        : orifice. The test      :                        :    excessive dips)     :
:                        : fails when the signal  :                        : -  Verify DPF EGR      :
:                        : from the DPF EGR       :                        :    sensor proper       :
:                        : sensor indicates EGR   :                        :    mounting and        :
:                        : flow is in the         :                        :    function (view DPF  :
:                        : negative direction.    :                        :    EGR PID while       :
:                        :                        :                        :    applying and        :
:                        :                        :                        :    releasing vacuum    :
:                        :                        :                        :    directly to sensor  :
:                        :                        :                        :    with a hand pump)   :
____________________________________________________________________________________________________


: P1406 - DPF EGR Sensor : While driving, the EGR : *  Downstream hose is  : -  Look for signs of   :
: Downstream Hose Off or : monitor commands the   :    disconnected        :    water or icing in   :
: Plugged                : EGR valve closed and   : *  Downstream hose is  :    hose                :
:                        : checks the             :    plugged (ice)       : -  Verify connection   :
:                        : differential pressure  : *  Plugged or damaged  :    and routing (no     :
:                        : across the EGR         :    EGR tube            :    excessive dips)     :
:                        : orifice. The test      :                        : -  Verify DPF EGR      :
:                        : fails when the signal  :                        :    sensor proper       :
:                        : from the DPF EGR       :                        :    mounting and        :
:                        : sensor continues to    :                        :    function (view      :
:                        : indicate EGR flow even :                        :    DPFEGR PID while    :
:                        : after the EGR valve is :                        :    applying and        :
:                        : commanded closed.      :                        :    releasing vacuum    :
:                        :                        :                        :    directly to sensor  :
:                        :                        :                        :    with a hand pump)   :
____________________________________________________________________________________________________

: P1408 - EGR Flow Out   : This test is performed : See Possible Causes    :
: of Self-Test Range     : during the KOER on     : for DTC P0401.         :
:                        : demand self-test only. :
:                        : The EGR system is      :
:                        : commanded ON at a      :
:                        : fixed engine speed.    :
:                        : The test fails and the :
:                        : DTC is output when the :
:                        : measured EGR flow      :
:                        : falls below the        :
:                        : required calibrated    :
:                        : minimum.               :
____________________________________________________________________________________________________

: P1409 - EGR Vacuum     : This test checks the   : *  EGRVR circuit open  : The EGR vacuum         :
: Regulator Solenoid     : electrical function of : *  VPWR open to EGRVR  : regulator solenoid     :
: Circuit Malfunction    : the EGRVR. solenoid.   :    solenoid            : resistance is from 26  :
:                        : The test fails when    : *  EGRVR circuit short : to 40 ohms.            :
:                        : the EGRVR circuit      :    to VPWR or GND      :
:                        : voltage is either too  : *  Damaged EGRVR       :
:                        : high or too low when   :    solenoid            :
:                        : compared to the        : *  Damaged PCM         :
:                        : expected voltage       :
:                        : range. The EGR system  :
:                        : must be enabled for    :
:                        : the test to be         :
:                        : completed.             :
____________________________________________________________________________________________________

: P1411 - Secondary Air  : The secondary air      : *  Electric AIR Pump   : In order to test the   :
: Injection (AIR) system : injection system does  : *  Hose from AIR pump  : AIR pump, it must be   :
: downstream flow        : not detect the         :    leak                : capable of driving the :
:                        : presence of air in the : *  AIR bypass solenoid : HO2S lean.             :
:                        : exhaust when           :    leak/blocked        :
:                        : introduced by the      : *  Hose from AIR pump  :
:                        : secondary air          :    blocked             :
:                        : injection system       : *  AIR bypass solenoid :
:                        :                        :    stuck open/closed   :
____________________________________________________________________________________________________

: P1413                  : The secondary air      : *  Open B+ circuit     : The AIR monitor        :
:                        : injection system       : *  Open AIR circuit    : circuit is held low by :
:                        : monitor circuit is low : *  Damaged PCM         : the resistance path    :
:                        : , indicating the       : *  Air circuit short   : through the AIR pump   :
:                        : electrical AIR pump is :    to ground           : when the pump is off.  :
:                        : off although the       : *  Damaged AIR pump    : Also, look for open    :
:                        : electrical AIR pump    : *  Damaged solid state : circuit from SSR to    :
:                        : was commanded on by    :    relay               : AIR pump.              :
:                        : the PCM.               :
____________________________________________________________________________________________________

: P1414                  : The secondary air      : *  Open AIR monitor    :
:                        : injection system       :    circuit from the    :
:                        : monitor circuit is     :    pump                :
:                        : high, indicating the   : *  AIR circuit short   :
:                        : electrical AIR pump is :    to power            :
:                        : on although the        : *  Damaged solid state :
:                        : electrical AIR pump    :    relay               :
:                        : was commanded off by   : *  Open AIR pump       :
:                        : the PCM.               :    ground              :
:                        :                        : *  Damaged AIR pump    :
:                        :                        : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1443 - Very Small Or  : A fuel tank pressure   : *  Blocked fuel vapor  : Check for blockages    :
: No Purge Flow          : change greater than a  :    hose between EVAP   : between the fuel tank, :
: Condition              : minus (-) 7 inches of  :    canister purge      : EVAP canister purge    :
:                        : H (2) O in 30 seconds  :    valve and FTP       : valve and engine       :
:                        : has occurred with      :    sensor.             : intake manifold. Check :
:                        : purge (fuel vapor)     : *  Blocked fuel vapor  : obstructions in the    :
:                        : flow less than 0.02    :    hose between EVAP   : EVAP canister purge    :
:                        : pounds per minute.     :    canister purge      : valve diaphragm and    :
:                        :                        :    valve and engine    : ports.                 :
:                        :                        :    intake manifold.    :
:                        :                        : *  Blocked vacuum hose :
:                        :                        :    between EVAP        :
:                        :                        :    canister purge      :
:                        :                        :    valve-solenoid and  :
:                        :                        :    engine intake       :
:                        :                        :    manifold.           :
:                        :                        : *  EVAP canister purge :
:                        :                        :    valve stuck closed  :
:                        :                        :    (mechanically).     :
____________________________________________________________________________________________________

: P1450 - Unable to      : Monitors the fuel      : *  Blockages or kinks  :
: Bleed Up Fuel Tank     : vapor vacuum and       :    in EVAP canister    :
: Vacuum                 : pressure in the fuel   :    tube or EVAP        :
:                        : tank. The system       :    canister purge      :
:                        : failure occurs when    :    outlet tube         :
:                        : the EVAP running loss  :    (between fuel tank, :
:                        : monitor detects        :    EVAP canister purge :
:                        : excessive fuel tank    :    valve and EVAP      :
:                        : vacuum with the engine :    canister)           :
:                        : running (but not at    : *  Fuel filler cap     :
:                        : idle).                 :    stuck closed (no    :
:                        :                        :    vacuum relief)      :
:                        :                        : *  Contaminated fuel   :
:                        :                        :    vapor elbow on EVAP :
:                        :                        :    canister            :
:                        :                        : *  Restricted EVAP     :
:                        :                        :    canister            :
:                        :                        : *  CV solenoid stuck   :
:                        :                        :    open (partially or  :
:                        :                        :    fully)              :
:                        :                        : *  Plugged CV solenoid :
:                        :                        :    filter              :
:                        :                        : *  EVAP canister purge :
:                        :                        :    valve stuck open    :
:                        :                        : *  VREF circuit open   :
:                        :                        :    (harness near FTP   :
:                        :                        :    sensor, FTP sensor  :
:                        :                        :    or PCM)             :
:                        :                        : *  Damaged FTP sensor  :
____________________________________________________________________________________________________

: P1451 - EVAP Control   : Monitors the canister  : *  VPWR circuit open   : -  Monitor EVAPCV PID  :
: System Canister Vent   : vent (CV) solenoid     : *  CV solenoid circuit :    and voltage between :
: Solenoid Circuit       : circuit for an         :    shorted to PWR GND  :    canister vent       :
: Malfunction            : electrical failure.    :    or CHASSIS GND      :    solenoid signal and :
:                        : The test fails when    : *  Damaged CV solenoid :    PWR GND in output   :
:                        : the signal moves       : *  CV solenoid circuit :    test mode with key  :
:                        : outside the minimum or :    open                :    ON engine OFF (or   :
:                        : maximum allowable      : *  CV solenoid circuit :    in key ON engine    :
:                        : calibrated parameters  :    shorted to VPWR     :    RUNNING mode)       :
:                        : for a specified        : *  Damaged PCM         : -  EVAPCV PID at 0%    :
:                        : canister vent duty     :                        :    and voltage less    :
:                        : cycle by PCM command.  :                        :    than 1.0 volt (or   :
:                        :                        :                        :    EVAPCV PID at 100%  :
:                        :                        :                        :    and voltage greater :
:                        :                        :                        :    than 0.5 volt)      :
:                        :                        :                        :    indicates a hard    :
:                        :                        :                        :    fault               :
____________________________________________________________________________________________________

: P1460 - Wide Open      : NOTE: For applications : *  Open or shorted WAC : -  When the WACF PID   :
: Throttle A/C Cutout    : that use a normally    :    circuit             :    reads YES, a fault  :
: Primary Circuit        : open relay to control  : *  Damaged WAC relay   :    is currently        :
: Malfunction            : the A/C clutch, the    :    (or CCRM)           :    present             :
:                        : following description  : *  Open VPWR circuit   : -  An open circuit or  :
:                        : applies to the A/C     :    to WAC relay        :    short to ground can :
:                        : clutch relay control   : *  Damaged PCM         :    only be detected    :
:                        : circuit. Monitors the  :                        :    when the PCM is not :
:                        : wide open throttle A/C :                        :    grounding the       :
:                        : cutoff (WAC) circuit   :                        :    circuit             :
:                        : output from the PCM.   :                        : -  A short to power    :
:                        : The test fails if:     :                        :    can only be         :
:                        : When the PCM grounds   :                        :    detected when the   :
:                        : the WAC circuit,       :                        :    PCM is grounding    :
:                        : excessive current draw :                        :    the circuit         :
:                        : is detected on the WAC :                        : -  During KOEO and     :
:                        : circuit; or with the   :                        :    KOER self-test, the :
:                        : WAC circuit not        :                        :    WAC circuit will be :
:                        : grounded by the PCM,   :                        :    cycled ON and OFF   :
:                        : voltage is not         :                        : -  Verify A/C and      :
:                        : detected on the WAC    :                        :    defrost were OFF    :
:                        : circuit (the PCM       :                        :    during KOEO and     :
:                        : expects to detect VPWR :                        :    KOER self-test      :
:                        : voltage coming through :                        :    (Check ACCS PID to  :
:                        : the WAC relay coil to  :                        :    verify)             :
:                        : the WAC circuit).      :                        : -  If vehicle is not   :
:                        :                        :                        :    equipped with A/C,  :
:                        :                        :                        :    DTC P1460 can be    :
:                        :                        :                        :    ignored             :
____________________________________________________________________________________________________

: P1461 - Air            : ACP inputs a voltage   : *  ACP sensor circuit  : Verify VREF voltage    :
: Conditioning Pressure  : to the PCM. If the     :    short to PWR        : between 4.0 and 6.0V.  :
: Sensor (ACP) Sensor    : voltage is above a     : *  ACP circuit open    :
: High Voltage Detected  : calibrated level the   : *  Damaged PCM         :
:                        : DTC will set.          : *  ACP circuit short   :
:                        :                        :    to VREF             :
:                        :                        : *  ACP circuit short   :
:                        :                        :    to SIGRTN           :
:                        :                        : *  Damaged ACP sensor  :
____________________________________________________________________________________________________

: P1462 - Air            : ACP inputs a voltage   : *  ACP circuit short   : Verify VREF voltage    :
: Conditioning Pressure  : to the PCM. If the     :    to GND or SIGRTN    : between 4.0 and 6.0V.  :
: Sensor (ACP) Sensor    : voltage is below the   : *  VREF circuit open   :
: Low Voltage Detected   : calibrated level the   : *  Damaged PCM         :
:                        : DTC will set.          : *  Open ACP circuit    :
:                        :                        : *  Damaged ACP sensor  :
____________________________________________________________________________________________________

: P1463 - Air            : Each time the A/C      : *  A/C system          : Verify A/C system      :
: Conditioning Pressure  : clutch engages, the    :    mechanical failure  : function, including    :
: Sensor (ACP)           : PCM is looking for a   : *  Open ACP or VREF    : refrigerant charge.    :
: Insufficient Pressure  : pressure change in the :    circuit             :
: Change                 : refrigerant. If the    : *  A/C sensor damaged  :
:                        : change in pressure is  : *  A/C system          :
:                        : outside of the         :    electrical failure  :
:                        : calibration the DTC    : *  A/C clutch always   :
:                        : will set.              :    engaged             :
____________________________________________________________________________________________________

: P1464 - A/C Demand Out : Indicates the ACCS     : *  A/C was on during   : If A/C or defrost were :
: Of Self-Test Range     : input to the PCM was   :    self-test           : on during self-test,   :
:                        : high during Self-Test. : *  A/C Clutch PWR      : turn off and rerun     :
:                        :                        :    circuit short to    : test.                  :
:                        :                        :    power (applications :
:                        :                        :    with N/C WAC relay  :
:                        :                        :    contacts)           :
:                        :                        : *  ACCS circuit short  :
:                        :                        :    to power            :
:                        :                        : *  Damaged A/C demand  :
:                        :                        :    switch              :
:                        :                        : *  Damaged WAC relay   :
:                        :                        :    (or CCRM)           :
:                        :                        : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1469 - Low A/C        : Indicates frequent A/C : *  Mechanical A/C      : -  An intermittent     :
: Cycling Period         : compressor clutch      :    system concern      :    open circuit,       :
:                        : cycling.               :    (such as low        :    although possible,  :
:                        :                        :    refrigerant charge, :    is unlikely         :
:                        :                        :    damaged A/C cycling : -  This test was       :
:                        :                        :    switch)             :    designed to protect :
:                        :                        : *  Intermittent open   :    the transmission.   :
:                        :                        :    between the cycling :    In some strategies, :
:                        :                        :    pressure switch and :    the PCM will unlock :
:                        :                        :    pin 41 (ACCS) to    :    the torque          :
:                        :                        :    the PCM             :    converter during A  :
:                        :                        : *  Intermittent open   :    /C clutch           :
:                        :                        :    in IGN RUN circuit  :    engagement. If a    :
:                        :                        :    to cycling pressure :    concern is present  :
:                        :                        :    switch (if          :    that results in     :
:                        :                        :    applicable)         :    frequent A/C clutch :
:                        :                        :                        :    cycling, damage     :
:                        :                        :                        :    could occur if the  :
:                        :                        :                        :    torque converter    :
:                        :                        :                        :    was cycled at these :
:                        :                        :                        :    intervals. This     :
:                        :                        :                        :    test will detect    :
:                        :                        :                        :    this condition, set :
:                        :                        :                        :    the DTC and prevent :
:                        :                        :                        :    the torque          :
:                        :                        :                        :    converter from      :
:                        :                        :                        :    excessive cycling.  :
____________________________________________________________________________________________________

: P1474 - Low Fan        : Monitors the low fan   : *  Open or shorted LFC : -  When the LFC PID    :
: Control Primary        : control (LFC) (fan     :    /FC circuit         :    reads YES, a fault  :
: Circuit Failure        : control [FC] for one   : *  Open VPWR circuit   :    is currently        :
:                        : speed fan application) :    to low speed fan    :    present             :
:                        : primary circuit output :    relay               : -  An open circuit or  :
:                        : from the PCM. The test : *  Damaged fuel pump   :    short to ground can :
:                        : fails if: When the PCM :    relay (or CCRM)     :    only be detected    :
:                        : grounds the LFC/FC     : *  Damaged PCM         :    when the PCM is not :
:                        : circuit, excessive     :                        :    grounding the LFC   :
:                        : current draw is        :                        :    /FC circuit         :
:                        : detected on the LFC/FC :                        : -  A short to power    :
:                        : circuit; or with the   :                        :    can only be         :
:                        : LFC/FC circuit not     :                        :    detected when the   :
:                        : grounded by the PCM,   :                        :    PCM is grounding    :
:                        : voltage is not         :                        :    the LFC/FC circuit. :
:                        : detected on the LFC/FC :                        :    During KOEO and     :
:                        : circuit (the PCM       :                        :    KOER Self-Test, the :
:                        : expects to detect VPWR :                        :    LFC/FC circuit will :
:                        : voltage coming through :                        :    be cycled on and    :
:                        : the low speed fan      :                        :    off                 :
:                        : relay [or CCRM] coil   :
:                        : to the LFC/FC          :
:                        : circuit).              :
____________________________________________________________________________________________________

: P1474 - Hydraulic      : This test checks the   : *  HCF circuit open    : The HCF solenoid is    :
: Cooling Fan Primary    : electrical function of : *  HCF circuit short   : integrated in the HCF  :
: Circuit Failure (HCF)  : the (HCF) primary      :    to power            : pump which looks like  :
:                        : circuit. The test      : *  HCF circuit short   : a power steering pump. :
:                        : fails if: the PCM      :    to ground           : The electrical         :
:                        : detects voltage either : *  Damaged HCF         : resistance of the      :
:                        : too high or too low    :    solenoid            : solenoid windings is   :
:                        : when compared to the   : *  Damaged PCM         : nominally 10 ohms.     :
:                        : expected voltage range :
:                        : on the (HCF) primary   :
:                        : circuit.               :
____________________________________________________________________________________________________

: P1479 - High Fan       : Monitors the high fan  : *  Open or shorted HFC : -  When the HFC PID    :
: Control Primary        : control (HFC) primary  :    circuit             :    reads YES, a fault  :
: Circuit Failure        : circuit output from    : *  Open VPWR circuit   :    is currently        :
:                        : the PCM. The test      :    to high speed fan   :    present             :
:                        : fails if: With the HFC :    relay               : -  An open circuit or  :
:                        : output commanded on    : *  Damaged high speed  :    short to ground can :
:                        : (grounded), excessive  :    fan relay (or CCRM) :    only be detected    :
:                        : current draw is        : *  Damaged PCM         :    when the PCM is not :
:                        : detected on the HFC    :                        :    grounding the HFC   :
:                        : circuit; or with the   :                        :    circuit             :
:                        : HFC circuit commanded  :                        : -  A short to power    :
:                        : off, voltage is not    :                        :    can only be         :
:                        : detected on the HFC    :                        :    detected when the   :
:                        : circuit (the PCM       :                        :    PCM is grounding    :
:                        : expects to detect VPWR :                        :    the HFC circuit     :
:                        : voltage coming through :                        : -  During KOEO and     :
:                        : the high speed fan     :                        :    KOER self-test, the :
:                        : relay [or CCRM] coil   :                        :    HFC circuit will be :
:                        : to the HFC circuit).   :                        :    cycled on and off   :
____________________________________________________________________________________________________

: P1500 - Vehicle Speed  : Indicates the VSS      : *  Intermittent VSS    :
: Sensor (VSS)           : input signal was       :    connections         :
: Intermittent           : intermittent. This DTC : *  Intermittent open   :
:                        : is set when a VSS      :    in VSS harness      :
:                        : fault interferes with  :    circuit(s)          :
:                        : other OBDII tests,     : *  Intermittent short  :
:                        : such as Catalyst       :    in VSS harness      :
:                        : efficiency monitor,    :    circuit(s)          :
:                        : EVAP monitor, HO2S     : *  Damaged VSS         :
:                        : monitor, etc.          : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1501 - Vehicle Speed  : Indicates the VSS      : *  Noisy VSS input     : Check for VSS input to :
: Sensor (VSS) Out of    : input signal is out of :    signal from Radio   : be 0 mph when vehicle  :
: Self Test Range        : Self Test range. If    :    Frequency           : transmission is in     :
:                        : the PCM detects a VSS  :    Interference/       : Park.                  :
:                        : input signal any time  :    Electro-Magnetic    :
:                        : during Self Test, a    :    Interference (RFI   :
:                        : DTC P1501 will be set  :    /EMI) external      :
:                        : and the test will      :    sources such as     :
:                        : abort.                 :    ignition wires,     :
:                        :                        :    charging circuit or :
:                        :                        :    after market        :
:                        :                        :    equipment.          :
____________________________________________________________________________________________________

: P1502 - Vehicle Speed  : Indicates the          : *  Refer to possible   : Refer to diagnostic    :
: Sensor (VSS)           : powertrain control     :    causes for P0500.   : aids for P0500.        :
: Intermittent           : module (PCM) detected  :
:                        : an error in the        :
:                        : vehicle speed          :
:                        : information. Vehicle   :
:                        : speed data is received :
:                        : from either the        :
:                        : vehicle speed sensor   :
:                        : (VSS), transfer case   :
:                        : speed sensor (TCSS),   :
:                        : anti-lock brake system :
:                        : (ABS) control module,  :
:                        : generic electronic     :
:                        : module (GEM), or       :
:                        : central timer module   :
:                        : (CTM). This DTC is set :
:                        : the same way as P0500. :
:                        : However, it is         :
:                        : intended to flash the  :
:                        : transmission control   :
:                        : indicator lamp (TCIL)  :
:                        : for first time VSS     :
:                        : circuit error          :
:                        : /malfunctions.         :
____________________________________________________________________________________________________

: P1502 - Vehicle Speed  : Indicates the          : Refer to possible      : Refer to diagnostic    :
: Sensor (VSS)           : powertrain control     : causes for P0500       : aides for P0500        :
: Intermittent (TCIL     : module (PCM) detected  :
: illuminates)           : an error in the        :
:                        : vehicle speed          :
:                        : information. Vehicle   :
:                        : speed data is received :
:                        : from either the        :
:                        : vehicle speed sensor   :
:                        : (VSS), anti-lock brake :
:                        : system (ABS) control   :
:                        : module, generic        :
:                        : electronic module      :
:                        : (GEM), or central      :
:                        : timer module (CTM).    :
:                        : This DTC is set the    :
:                        : same way as P0500.     :
:                        : However, it is         :
:                        : intended to flash the  :
:                        : transmission control   :
:                        : indicator lamp (TCIL)  :
:                        : for first time VSS     :
:                        : circuit error          :
:                        : /malfunctions.         :
____________________________________________________________________________________________________

: P1504 - Idle Air       : This DTC is set when   : *  IAC circuit open    : -  The IAC solenoid    :
: Control (IAC) Circuit  : the PCM detects an     : *  VPWR to IAC         :    resistance is from  :
: Malfunction            : electrical load        :    solenoid open       :    6 to 13 ohms.       :
:                        : failure on the IAC     : *  IAC circuit short   :   *  IAC valve stuck   :
:                        : output circuit.        :    to PWR              :      open              :
:                        :                        : *  IAC circuit short   :   *  Vacuum leaks      :
:                        :                        :    to GND              :   *  Failed EVAP       :
:                        :                        : *  Damaged IAC valve   :      system            :
:                        :                        : *  Damaged PCM         :   *  Damaged PCM       :
:                        :                        :                        : -  The IAC solenoid    :
:                        :                        :                        :    resistance is from  :
:                        :                        :                        :    6 to 13 ohms.       :
____________________________________________________________________________________________________

: P1506 - Idle Air       : This DTC is set when   : *  IAC circuit short   : Disconnect IAC valve   :
: Control (IAC)          : the PCM detects engine :    to GND              : and look for little or :
: Overspeed Error        : idle speed that is     : *  Damaged IAC valve   : no change in engine    :
:                        : greater than the       :                        : rpm as an indication   :
:                        : desired rpm.           :                        : of a stuck or damaged  :
:                        :                        :                        : valve.                 :
____________________________________________________________________________________________________

: P1507 - Idle Air       : This DTC is set when   : *  IAC circuit open    : -  The IAC solenoid    :
: Control (IAC)          : the PCM detects engine : *  IAC circuit short   :    resistance is from  :
: Underspeed Error       : idle speed that is     :    to PWR              :    6 to 13 ohms        :
:                        : less than the desired  : *  VPWR to IAC         : -  Disconnect IAC      :
:                        : rpm.                   :    solenoid open       :    valve and look for  :
:                        :                        : *  Air inlet is        :    no change in engine :
:                        :                        :    plugged             :    rpm as an           :
:                        :                        : *  Damaged IAC         :    indication of a     :
:                        :                        :    solenoid            :    stuck or damaged    :
:                        :                        : *  Damaged PCM         :    valve               :
____________________________________________________________________________________________________

: P1516 - Intake         :
: Manifold Runner        :
: Control Input Error    :
: (Bank 1)               :
____________________________________________________________________________________________________

: P1517 - Intake         : The IMRC system is     : *  Mechanical concern  : -  An IMRCM PID        :
: Manifold Runner        : monitored for failure  :    - bind, seize,      :    reading at closed   :
: Control Input Error    : during continuous or   :    damage or           :    throttle that is    :
: (Bank 2)               : key ON engine OFF self :    obstruction of IMRC :    less than VREF may  :
:                        : -test. Each DTC will   :    hardware            :    indicate a fault    :
:                        : distinguish the        :                        : -  An IMRCM PID        :
:                        : corresponding failed   :                        :    reading near 1 volt :
:                        : bank for IMRC actuator :                        :    or greater with     :
:                        : assemblies with dual   :                        :    engine rpm of at    :
:                        : monitor switches. The  :                        :    least 3000 may      :
:                        : test fails when the    :                        :    indicate a fault    :
:                        : signal on the monitor  :
:                        : pin is outside an      :
:                        : expected calibrated    :
:                        : range.                 :
____________________________________________________________________________________________________

: P1518 - Intake         : The IMRC system is     : *  IMRC monitor signal : An IMRCM PID reading   :
: Manifold Runner        : monitored for failure  :    circuit shorted to  : approximately near 1   :
: Control Malfunction    : during continuous, key :    PWR GND or SIG RTN  : volt at closed         :
: (Stuck Open)           : ON engine OFF or key   : *  Damaged IMRC        : throttle may indicate  :
:                        : ON engine running self :    actuator            : a fault                :
:                        : -test. The test fails  : *  Damaged PCM         :
:                        : when the signal on the :
:                        : monitor pin is less    :
:                        : than an expected       :
:                        : calibrated range at    :
:                        : closed throttle.       :
____________________________________________________________________________________________________

: P1519 - Inlet Manifold : The IMRC system is     : *  IMRC monitor        : An IMRCM PID reading   :
: Runner Control         : monitored for failure  :    circuit open        : at VREF with engine    :
: Malfunction (Stuck     : during continuous, key : *  IMRC control        : rpm of at least 3000   :
: Closed)                : ON engine OFF or key   :    circuit open        : may indicate a fault.  :
:                        : ON engine running self : *  IMRC monitor        :
:                        : -test. The test fails  :    circuit short to    :
:                        : when the signal on the :    VREF                :
:                        : monitor pin is more    : *  IMRC monitor return :
:                        : than an expected       :    circuit open        :
:                        : calibrated range with  : *  Damaged IMRC        :
:                        : IMRC activated.        :    actuator            :
:                        :                        : *  IMRC VPWR circuit   :
:                        :                        :    open                :
:                        :                        : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1549 - Intake         : The IMCC or intake     : *  Open IMT valve      : -  An IMT valve fault  :
: Manifold Communication : manifold tuning (IMT)  :    circuit             : PID (IMTVF) displaying :
: Control Circuit        : valve system is        : *  Open VPWR circuit   : YES status may         :
: Malfunction            : monitored for failure  : *  Shorted IMT valve   : indicate a fault       :
:                        : during continuous or   :    circuit             : -  The DTC indicates   :
:                        : key ON engine OFF self : *  Damaged IMT valve   :       the PSP sensor   :
:                        : -test. The test fails  : *  Damaged PCM         :       is out of Self   :
:                        : when the PCM detects a : *  PSP sensor damaged  :       -Te              :
:                        : concern with IMT valve : *  Damaged PCM         :
:                        : output circuit.        :
____________________________________________________________________________________________________

: P1550 - Power Steering : The PSP sensor input   :
: Pressure (PSP) Sensor  : signal to PCM is       :
: Malfunction            : continuously           :
:                        : monitored. The test    :
:                        : fails when the signal  :
:                        : falls out of a maximum :
:                        : or minimum calibrated  :
:                        : range.                 :
____________________________________________________________________________________________________

: P1605 - Keep Alive     : Indicates the PCM has  : *  Reprogramming       : If KAPWR is            :
: Memory Test Failure    : experienced an         : *  Battery terminal    : interrupted to the PCM :
:                        : internal memory test   :    corrosion           : , because of a battery :
:                        : failure. However there : *  Damaged PCM         : or PCM disconnect, DTC :
:                        : are external items     : *  KAPWR to PCM        : can be generated on    :
:                        : that can cause this    :    interrupt/open      : the first power-up.    :
:                        : DTC.                   : *  Loose battery       :
:                        :                        :    connection          :
____________________________________________________________________________________________________

: P1633 - Keep Alive     : Indicates that the     : *  Open KAPWR circuit  :
: Power Voltage Too Low  : Keep Alive Power       : *  Damaged PCM         :
:                        : (KAPWR) circuit has    : *  Intermittent KAPWR  :
:                        : experienced a power    :    Circuit             :
:                        : interrupt.             :
____________________________________________________________________________________________________

: P1635 - Tire/Axle      : This Diagnostic        : *  Incorrect tire size : Using the scan tool,   :
: Ratio Out Of           : Trouble Code (DTC)     : *  Incorrect axle      : view the tire and axle :
: Acceptable Range       : indicates the tire and :    ratio               : parameters within the  :
:                        : axle information       : *  Incorrect VID       : VID. They must match   :
:                        : contained in Vehicle   :    configuration       : vehicle hardware.      :
:                        : ID block (VID) does    :    parameters          :
:                        : not match vehicle      :
:                        : hardware.              :
____________________________________________________________________________________________________

: P1640 - Powertrain     : Vehicles using a       : *  DTCs stored in a    : Call-up PID address    :
: DTC's Available in     : secondary Engine       :    secondary module,   : 0946 to determine      :
: Another Module         : Control Module can     :    which requested the : secondary module       :
:                        : request that the       :    MIL to be turned    : requesting MIL         :
:                        : Powertrain Control     :    on.                 : illumination. Once     :
:                        : Module illuminate the  :                        : secondary module is    :
:                        : Check Engine Light     :                        : determined request     :
:                        : when a failure occurs  :                        : DTCs from module.      :
:                        : which affect emission. :
____________________________________________________________________________________________________

: P1650 - Power Steering : In Key On, Engine Off  : *  Steering wheel must :
: Pressure (PSP) Switch  : Self-Test, this DTC    :    not be turned       :
: Malfunction            : indicates the PSP      :    during Key On,      :
:                        : input to the PCM is    :    Engine Running Self :
:                        : high. In Key On,       :    -Test               :
:                        : Engine Running Self    : *  PSP switch/shorting :
:                        : -Test, this DTC        :    bar damaged         :
:                        : indicates that the PSP : *  SIG RTN circuit     :
:                        : input did not change   :    open                :
:                        : state.                 : *  PSP circuit open or :
:                        :                        :    shorted to SIGRTN   :
:                        :                        : *  PCM damaged         :
____________________________________________________________________________________________________

: P1651 - Power Steering : The PCM counts the     : *  Vehicle towed with  : -  Check, if possible, :
: Pressure (PSP) Switch  : number of times        :    engine running      :    if vehicle was      :
: Signal Malfunction     : vehicle speed          : *  Power steering      :    towed or power      :
:                        : transitions from 0 to  :    hydraulic concern   :    steering service    :
:                        : a calibratable speed.  :    was repaired but    :    was performed.      :
:                        : After a calibratable   :    DTC was not erased  : -  Observe PSP V PID   :
:                        : number of speed        : *  PSP switch/shorting :    while checking      :
:                        : transitions the PCM    :    bar damaged         :    wires for           :
:                        : expects that the PSP   : *  SIG RTN circuit     :    intermittents.      :
:                        : input should have      :    open                :
:                        : changed. This DTC is   : *  PSP circuit open or :
:                        : set if the transition  :    shorted to SIGRTN   :
:                        : is not detected.       : *  PCM damaged         :
____________________________________________________________________________________________________

: P1703 - Brake Switch   : Indicates that during  : *  Open or short in    : Check for proper       :
: Out of Self-Test Range : Key On Engine Off      :    (BPP) circuit       : function of stoplamps. :
:                        : (KOEO) Self-Test, BPP  : *  Open or short in    : Follow correct Self    :
:                        : signal was high. Or    :    stoplamp circuits   : -Test procedures,      :
:                        : during Key On Engine   : *  Damaged PCM         : refer to Section 2     :
:                        : Running (KOER) Self    : *  Malfunction in      : Quick Test.            :
:                        : -Test, the BPP signal  :    module(s) connected :
:                        : did not cycle high and :    to BPP circuit      :
:                        : low.                   :    (Rear Electronic    :
:                        :                        :    Module [REM]        :
:                        :                        :    Windstar and LS6    :
:                        :                        :    /LS8 and Lighting   :
:                        :                        :    Control Module      :
:                        :                        :    (LCM) Continental   :
:                        :                        :    and Town Car)       :
:                        :                        : *  Damaged Brake       :
:                        :                        :    Switch              :
:                        :                        : *  Misadjusted Brake   :
:                        :                        :    Switch              :
____________________________________________________________________________________________________

: P1705 - Transmission   :
: Range Sensor Out of    :
: Self-Test Range        :
____________________________________________________________________________________________________

: P1709 - Park/Neutral   : The DTCs indicate that : *  PNP/CPP circuit     : When exercising either :
: Position Switch Out of : the voltage is high    :    short to PWR        : the PNP or CPP switch  :
: Self-Test Range        : when it should be low. : *  Damaged PNP or CPP  : the voltage should     :
:                        :                        :    switch              : cycle from 5.0V to low :
:                        :                        : *  PNP/CPP circuit     :
:                        :                        :    open in the SIGRTN  :
:                        :                        : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1729 - 4x4L Switch    : The 4x4L switch is an  : *  4x4L harness open   : Verify the 4x4L switch :
: Malfunction            : ON/OFF. If the PCM     :    or shorted          : cycles ON/OFF.         :
:                        : does not see low       : *  Damaged electronic  :
:                        : voltage when the       :    shift module        :
:                        : switch is ON a DTC     : *  Damaged PCM         :
:                        : will set.              :
____________________________________________________________________________________________________

: P1780 - Transmission   : During KOER self-test  : *  TCS circuit short   : Verify the TCS switch  :
: Control Switch Out of  : the TCS has to be      :    or open             : cycles ON/OFF          :
: Self-Test Range        : cycled, if not cycled  : *  Damaged TCS switch  :
:                        : a DTC is set.          : *  Damaged PCM         :
____________________________________________________________________________________________________

: P1781 - 4x4L Switch    : The 4x4L switch is an  : *  4x4L harness open   : Verify the 4x4L switch :
: Out of Self-Test Range : ON/OFF. If the PCM     :    or shorted          : cycles ON/OFF          :
:                        : does not see low       : *  Damaged electronic  :
:                        : voltage when the       :    shift module        :
:                        : switch is on a DTC     : *  Damaged PCM         :
:                        : will set.              :
____________________________________________________________________________________________________

: P1900 - Output Shaft   : See DTC P0723          :
: Speed sensor circuit   :
: intermittent failure   :