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.
Other information:
- If there are also communication problems with other control modules, check according to Central Electronic Module (CEM) Section 36.
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 Connecting the Breakout Box.
- For information about additional heater module signals, see Signal specification Signal Specification.
- For information about central electronic module signals, see Signal specification Pinout Values and Diagnostic Parameters.
Continue - Verification
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Verification
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 - VERIFIED
No - VERIFICATION FAILEDPAPER
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - Fault Found
PAPER - No Fault Found
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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 - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Checking communication
FAULT FOUND - Fault Found
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