Signal Missing

Signal missing

Checking fuses
Check that the fuse for the function in question is intact.
For information about fuses, see the wiring diagram.

Was a fault detected?

Yes - Verification

No - Checking the wiring

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

Checking the wiring








- Ignition off
- Disconnect central electronic module (CEM) connector C.
The diagnostic trouble code (DTC) indicates that the communication between the combustion preheater module (CPM) and central electronic module (CEM) is not working. This may be due to a fault in the signal cable between the control modules or a damaged communication device in one or both of the control modules.
Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between central electronic module (CEM) terminal #C32 (#32) and combustion preheater module (CPM) terminal #6.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Pinout Values and Diagnostic Parameters
- Location of components Locations
- Control module engine coolant heater, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals

Was a fault detected?

Yes - Verification

No - Replacing the control module

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

Replacing the control module
Try a new combustion preheater module (CPM).
Remedy as necessary.

Other information
- Control module engine coolant heater, replacing Service and Repair


Continue - Verification

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

Verification




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 - VERIFIED

No - VERIFICATION FAILED

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

VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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

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

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

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the wiring

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