Too Long Time

Too long time

Checking communication
Check whether the communication is working. Read off the control module P/N in the VIDA communication input for example.
Check if the fault is limited to the Combustion Preheater Module (CPM) or if several nodes have communication problems. If the problem is limited to contact with the auxiliary heater, the fault has been located.
If the communication works and the P/N can be read off, the fault is intermittent.
Remedy as necessary.

Continue - Checking communication

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Checking communication
Check the cable between Combustion Preheater Module (CPM) #6 and Central Electronic Module (CEM) #18A for a loose connection as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and short-circuit to ground, Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: All communication between the additional heater and the central electronic module (CEM) is via this cable.

Also check the connectors.
Remedy as necessary.

Other information:
- To access the control module / connect the breakout box, see Connecting the breakout box Pinout Values and Diagnostic Parameters.
- For information about additional heater module signals, see Signal specification Signal Specification.
- For information about central electronic module signals, see Signal specification Signal Specification.









Continue - Verification

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Verification




Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Connect connector, install components etc.
- Ignition on.

Note! It is important that only the ignition is on for the heater to start up.

- Activate the heater.
A buzzing sound should be heard from the heater.
Check the function of the heater as described in Engine coolant heater, test running Engine Coolant Heater, Test Running.

Additional information:
- For a description of the parameters, see Description of parameters Description of Parameters.
- For a description of activations, see Activating components/functions Activating Components/Functions.





Does the heater work?

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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