Checking the Feeds

Checking the feeds

Checking supply




- Ignition on.
Check the supply to Combustion Preheater Module (CPM) #9 for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , or a loose connection as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Also check fuse 9 in the engine compartment.
Check the cable between #1 on the Ext-X relay (2/29) and #15 on the Combustion Preheater Module (CPM) for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , or for a loose connection as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Also check the relay (2/29), the supply to the relay and passenger compartment fuse 24.
Check that the ground lead is undamaged by checking the cable between additional heater #3 and the ground terminal.
Also check the intermediate connectors.

Other information:
- To replace the relay, see Central electronic module (CEM), replacing .
- For other values, see Signal specification Signal Specification.
Remedy as necessary.













Continue - 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 - Verification complete

No - Fault-tracing information

-------------------------------------------------

Fault-tracing information




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

------------------------

Attempt New Test - Checking supply

-------------------------------------------------