1A6X - 2

Condition







Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the engine control module (ECM) is not operating.

NOTE: In the event of CEM-1A6x diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a communication fault in the Control area network.

Substitute value

- None.

Possible source

- No power supply to the engine control module (ECM).
- Open-circuit in the ground lead to the engine control module (ECM).
- Contact resistance in the terminals.
- Open-circuit in the wiring for the CAN high speed network to the engine control module (ECM).
- The engine control module (ECM) is not intended for this car (for example a used control module with different software/hardware).

Hint: If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the high speed network, this indicates a common fault in the Control area network, see the wiring diagram.

Fault symptom[s]

- The starter motor turns but the engine does not start.
- The engine cuts out.
- Engine feels sluggish.
- Malfunction indicator lamp (MIL) lit.
- Message in the display.