Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-U010000

Condition
The control modules communicate with each other for exchange of information in a network via a standardized serial communication procedure - CAN (Controller Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Interrupted or missing communication with the Engine control module (ECM).
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met. The diagnostic trouble code (DTC) indicates a fault in the communication across the CAN network and does not isolate an individual node. Do not replace the central electronic module (CEM) unless fault-tracing indicates a damaged control module.





Substitute value
- None.

Possible source
- Voltage supply to the Engine control module (ECM) missing.
- Open circuit in engine control module (ECM) ground cable.
- Contact resistance in the terminals.
- Open-circuit or short-circuit in the wiring for the control area network (CAN).
- The Engine control module (ECM) is not intended for this vehicle, for example, it is a used control module with other software/hardware.

Hint: If several diagnostic trouble codes for communication errors with other control modules in the high-speed network are stored in the Central electronic module (CEM), this indicates some common problem in the CAN-network (see wiring diagram).

Fault symptom[s]
- Starter motor does not operate
- Engine stalls
- Lack of power
- Malfunction indicator light (MIL), on
- Message in information display