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Rover 400 OBD

MEMS vs OBD II

OBD, refers to the vehicle's self-diagnostic and reporting capability. OBD Systems were first implemented in American vehicles in the 1970's as part of the drive by vehicle manufacturers to meet EPA standards. Central to achieving this was the inclusion of electronic control systems, sensors and a centralised computerised control system. Early OBD was very much manufacturer specific with limited information generating capabilities, and indication could be just illumination of the engine fault light (MIL).

Current OBD II systems give the technician access to far more information on various vehicle sub-systems, and sensors. The type and amount of diagnostic information available via OBD II still varies widely between manufacturers but the standardised digital communications port has been adopted by almost all.

Now the bad news Rover didn't start fitting OBDII to it's cars until 2001, prior to this the vehicles were fitted with a system called MEMS. As a result generic OBD II code readers can't be used on any Rover manufactured before this date. To access engine information on the 400 series Rover specific equipment T4 program and interface module, will be required.

For later vehicles:-

Rover OBD II Port Rover OBD II Port info



P-Codes

P-Codes, or OBD II codes beginning with the designation P-0xxx are Society of Automotive Engineers (SAE) defined codes. These are generic to all vehicles and vehicle manufacturers selling into the US and Europe. The DTCs originally developed for OBD-II systems are based on SAE J2012 standards.

P-Codes beginning with the designation P-1xxx are manufacturer specific codes which may be associated with a particular ECM, component or system. In such cases there may not be an equivalent SAE code definition.

Generic plug-in diagnostic tools can be used to read fault or error codes, but as many Rover codes are manufacturer specific, all but the most expensive code readers will require that you also have access to a manual or other reference to find out what the codes mean.

MEMS page





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