Engine Controls - MIL ON/Code 2AFD Diagnostics

SI B 12 04 09
Engine Electrical Systems

February 2009
Technical Service

SUBJECT
M3 S65 - Diagnosis for DME Fault Code 2AFD

MODEL
E90, E92, E93 (M3) with S65

SITUATION
The Service Engine Soon lamp is illuminated and fault code 2AFD (Relative time plausibility, time signal implausible, currently not present) is stored in the MSS60 DME control module.

CAUSE
Error in the diagnostic software of the DME control module, causing an incorrect evaluation of the difference between the engine oil temperature and the coolant temperature under cold weather conditions

The situation may be reproduced only at low ambient temperatures (below 0� C). After the warmed engine is turned off, the customer activates the IHKA "REST" function (Residual heat mode) for 10-15 minutes, and then turns the engine on again.

CORRECTION
At present, clear the DME fault memory and release the vehicle to the customer. Do not replace any components (e.g., DME) for this type of complaint.

Inform the customer that DME fault code 2AFD does not affect emissions or the drivability of the vehicle. Also, advise that prolonged use of the "REST" heat feature may cause the Service Engine Soon lamp to be illuminated.

The improved DME software is planned for release in September 2009.

WARRANTY INFORMATION
For information only





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