Rover common ECU failure.

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EDC 400 series diesels, all years, suffer from electronic failure.  Injection pumps cost a fortune to overhaul £700+ so off car testing (PDC5) very cost effective.  If only to eliminate suspect pump control module from replacement.  800 series rovers electronics are weak in all areas! ABS integrated control boxes adjacent to right inner wing common failure for rebuild.

Rover 800 ABS Modules  800 series rovers electronics are weak in all areas! ABS integrated control boxes adjacent to right inner wing common failure for rebuild (not too expensive).  Main ECU under seat, can make some unusual noises, but carry on functioning for years!  Coms from faultcode reading kit normally fail, when faultcode reading not available on most attempts, scope-ing sensors normally the only time consuming route one can take!

The Bosch /Rover EDC pump unit fitted to 200/400/600 diesels from May 95 - May 00, and Freelander with L series diesel engines are now becoming a common failure. This ECU (PSG-5) is particularly susceptible to voltage surge when jump starting your car.

Rover 75 early models >2001 can can suffer mileage display problems.  Fault presents itself as "999999" or "111111" on LCD, any hexidecimal faultcodes retrieved will make no sense.  Fault maybe in the white multiplug connecting the combi instrument panel to the wiring harness or an internal fault with the combi unit.  Main ECM engine control modules on these models are very robust, only suffering overfueling or no injector pulse when damaged with voltage spikes from jumpstarting.

MEMS units.  Rover models from 1991 to 1999 suffer a number of minor failures of the MEMS (Modular Engine Management System) fitted to many 1XX, 2XX and 4XX series.  Identify this ECU type by looking for Rover label with M.E.M.S. initials.  Note that some Rover models are fitted with PGM-F1 engine management system - this system is Honda design and normally very reliable.  Common symptoms include idle control problems which can be intermittent.  Typically car idles at up to 3000rpm but can also cause low idle with stalling at traffic lights and junctions.  Also the battery discharges over 3 or 4 day period.  For idle speed problems, first check operation of throttle position switch, making sure throttle linkage is not catching on anything.  Also check operation of idle valve and wiring. If both ok, then ECU is suspect.  Wherever possible, carry out tests for induction side airleaks as these can also cause high idle speeds.  For battery discharge problems, turn ignition OFF and check battery current draw - look for about 400 milliamps drain with EVERYTHING turned off. 

Note:  That disconnecting battery will sometimes reset the ECU and problem will go away - until the next time!  Do not leave battery disconnected for long periods as you will lose radio security codes.

MEMS module testing.

MEMS 19 complete security set.

Over riding Rover / MG Key fob (Plip) programming.  There are 2 common security systems fitted to MG / Rover models across the year range 1996 to 2006, ‘Lucas5AS’ and ‘Pektron SCU’. These systems can be easily identifiable from the remote fob, or Plip, as follows:

  Lucas 5AS system (1996 – 2003)

 SCU system 2 button remote (2003 – 2006)

  SCU system 3 button remote (2003 – 2006)

Lucas 5AS (1996 – 2003)  Vehicle coverage: Rover 200 400 25 45  MG ZR ZS F TF

ECU Programming functions: Find-source the EKA code.  This code allows a manual override of the security system via the drivers door lock. A code of ‘5137’ would be entered by turning the key in the drivers door lock as follows:

5 Turn UNLOCK, 1 Turns LOCK, 3 Turns UNLOCK, 7 Turns LOCK

Pektron SCU System (2003 - 2006)

Vehicle coverage:  Rover 25 45  MG ZR ZS TF

ECU Programming functions:  Find-source the EKA code.  This code allows a manual override of the security system via the drivers door lock. A code of ‘5137’ would be entered by turning the key in the drivers door lock as follows:

5 Turn UNLOCK, 1 Turns LOCK, 3 Turns UNLOCK, 7 Turns LOCK

EKA codes can be extracted from the control unit with basic diagnostic equipment, some Rovers were supplied with the code from new in the "owners document pack".

Page updated 25-01-15