Communication Problems With the Engine Control Module (ECM)

Communication problems with the engine control module (ECM)

Information
Hint: In the event of communication problems, the fault may exist in other parts of the communications network. The role of the central electronic module (CEM) is to control the communications network and to store diagnostic trouble codes (DTCs) in the event of communication problems between control modules.

If there are diagnostic trouble codes (DTCs) for communication problems stored for the brake control module (BCM) in the central electronic module (CEM), these must be fault traced first.

Were diagnostic trouble codes (DTCs) stored in the central electronic module (CEM)?

Yes - DONE

No - Checking diagnostic trouble codes (DTCs) in the engine control module (ECM)

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Checking diagnostic trouble codes (DTCs) in the engine control module (ECM)
The diagnostic trouble code (DTC) is stored because the torque signal or engine speed signal from the engine has been missing for more than 500 ms. The signals are used by the brake control module (BCM) to control the stability function. Read off diagnostic trouble codes (DTCs) in the engine control module (ECM). Fault-trace according to the relevant information.

Continue - DONE

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