Too Long Time

Too long time

Checking communication
Check whether the communication is working. Read off the combustion preheater module (CPM) P/N in the VIDA communication input for example.
Test whether the fault is only limited to the combustion preheater module (CPM) or if there are communication faults with other nodes as well. The fault has been localized if the only problem is in establishing contact with the combustion preheater module (CPM).
If the communication works and the P/N can be read off, the fault is intermittent.

Continue - Checking communication

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Activate the combustion preheater module (CPM).
Check that the engine coolant heater is activated.

Is the engine coolant heater working?

Yes - Troubleshooting procedure complete

No - 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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Attempt New Test - Checking communication

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Checking communication
Check the cable between combustion preheater module (CPM) terminal #6 and central electronic module (CEM) terminal #C32. Check for a short-circuit to ground. Check for loose connections.

Hint: All communication between the combustion preheater module (CPM) and the central electronic module (CEM) is via this cable.

Also check the connectors.
Remedy as necessary.

Other information
- Connecting the breakout box Pinout Values and Diagnostic Parameters
- Combustion preheater module (CPM): Signal specification Signal Specification
- Central electronic module (CEM): Signal specification Signal Specification
- Checking wiring and terminals Checking Wiring and Terminals





Continue - Verification

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