No Communication

No communication

Status check





Reading off the status of the diagnostic trouble code (DTC)

Engine control module (ECM)

Reading off the status of the diagnostic trouble code (DTC):
Note! When reading off the DTC status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.

- Start the engine. Let it idle for at least 15 seconds.
- Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).





Was the status of the relevant diagnostic trouble code (DTC) permanent?

Yes - PERMANENT

No - INTERMITTENT

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PERMANENT - Other diagnostic trouble codes (DTCs)

INTERMITTENT - Intermittent fault

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Other diagnostic trouble codes (DTCs)
The immobilizer function is integrated in the central electronic module (CEM).
This diagnostic trouble code (DTC) can be caused by missing CAN communication. If there are diagnostic trouble codes (DTC) stored in the central electronic module (CEM), fault trace accordingly.
Read off the diagnostic trouble codes (DTCs) for the central electronic module (CEM).





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

Yes - Fault Found

No - Replacing and programming the engine control module (ECM)

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Replacing and programming the engine control module (ECM)
The engine control module (ECM) has registered an internal communication problem.

Caution! A new engine control module (ECM) is delivered without software. The engine control module (ECM) must be programmed when it has been replaced.

For information about programming and replacing the engine control module (ECM), see Engine control module (ECM), replacing Service and Repair.






Continue - Fault-tracing information

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Intermittent fault
The engine control module (ECM) has previously detected a fault in the communication between the immobilizer function in the central electronic module (CEM) and the engine control module (ECM).

Other information:
- To access/replace the central electronic module (CEM): Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- Engine control module (ECM), replacing Service and Repair
- For information on engine control module (ECM) signals: Signal specification Signal Description / Specification
- For information about the central electronic module (CEM) signals, see Signal specification Pinout Values and Diagnostic Parameters.


Continue - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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Attempt New Test - Status check

FAULT FOUND - DONE

DONE - DONE

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Fault-tracing information




Information

Fault-tracing information
In case of this defect, troubleshooting is not followed by verification.
The information can be displayed again or the fault-tracing for this fault can be interrupted.

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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Attempt New Test - Status check

FAULT FOUND - DONE

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