Diagnostic Trouble Code (DTC) Information CPM-E003: Notes
Condition
The combustion preheater module (CPM) compares its configuration ID with the signal configuration transmitted on the control area network (CAN) by the central electronic module (CEM). If the configuration IDs do not correspond the fault code is stored. The diagnostic trouble code (DTC) is also stored if the communication between the combustion preheater module (CPM) and the central electronic module (CEM) is interrupted.
NOTE:
In the event of an open-circuit in both the control area network (CAN) cables, it is not possible to communicate with the combustion preheater module (CPM). Therefore it will only be possible to read off the diagnostic trouble code (DTC) if this type of fault is intermittent. When the diagnostic trouble code (DTC) is stored, the combustion preheater module (CPM) responds to the diagnostic commands. However normal control area network (CAN) communication does not work ("Expulsion mode").
Substitute Value
- None.
Possible Source
- Incorrect control area network (CAN) configuration ID (the node is not intended for this car - for example a used control module with different software/hardware)
- Open-circuit in the control area network (CAN) wiring between the combustion preheater module (CPM) and the central electrical module (CEM).
Fault symptom[s]
- Poor heating in the passenger compartment
- The parking heater does not operate.