U0423
U0423
Diagnosis information - CAN
Fault entry in specified control unit NOTE: Internal function test completed. Diagnostic conditions
The control unit initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.Control unit wake-up through:- Event-induced CAN message
- Wake-up signal via wake-up line
- key contact (terminal S)
- Ignition on
Possible fault causes
- Control unit is incorrectly coded
- Periphery connected to specified control unit is incorrect
- Control unit faulty (in most cases the cause is not the control unit but incorrect coding.)
Fault effects
- The specified control unit sends only substitute values via the CAN.
- Other control units detect these substitute values and set this fault code.
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