Short-Circuit To Ground

Short-circuit to ground

IMM-312 Communication link to the engine control module (ECM)

Fault counter
Read off diagnostic trouble code (DTC), the status message and fault counter according to Read off fault counter Read Off Fault Counter.

Does the fault counter display zero (0) ?

Yes - Checking permanent short-circuit

No - Check for an intermittent short-circuit

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Checking permanent short-circuit
Check cables for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Caution! The engine control module (ECM) must not be disconnected until at least 4 minutes after switching off the ignition and the engine cooling fan (FC) stopping.

- Cars with Fenix 5.2, the cable between immobilizer control module #2 and engine control module (ECM) #B5.
- Cars with M4.4, MSA 15.7, cable between immobilizer control module #4 and engine control module (ECM) #B36.









Select "Continue" when the fault has been repaired.

Continue - Verification

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Check for an intermittent short-circuit
Check cables for a short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Caution! The engine control module (ECM) must not be disconnected until at least 4 minutes after switching off the ignition and the engine cooling fan (FC) stopping.

- Cars with Fenix 5.2, the cable between immobilizer control module #2 and engine control module (ECM) #B5.
- Cars with M4.4, MSA 15.7, cable between immobilizer control module #4 and engine control module (ECM) #B36.









Select "Continue" when the fault has been repaired.

Continue - Verification
FAULT FOUND

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Verification




Verification

Hint: After repair the check that the repair is successful and that the fault is corrected as follows.

- Ignition on.
- Erase diagnostic trouble codes (DTCs)
Start the engine a number of times.





Continue - Verification, continued

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Verification, continued




- Ignition on.
Read diagnostic trouble codes (DTCs).





Is the diagnostic trouble code (DTC) still stored?

Yes - VERIFICATION FAILED

No - VERIFIED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test


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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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