Faulty Signal or Signal Missing

Faulty signal or signal missing

Checking the connectors and components
Check the battery voltage.
Check the charging function of the generator (GEN).
Check the fuse before the circuit. If the fuse is blown, check the circuit. Check for a short-circuit to ground.
Check the cable between system relay terminal #5 and control module terminal #A17 (#A17). Check for an open-circuit.
Check the engine control module (ECM) and system relay connectors. Check for contact resistance and oxidation.
Remedy as necessary.
Try a new system relay if no fault is found during the above fault-tracing.

Hint: Read off the voltage from the system relay to the engine control module (ECM).

Other information
- To fault-trace the charging system, see Fault-tracing and testing the voltage supply system Fault-Tracing And Testing the Electrical Generating
- For further information about the fuses and relays, see the Wiring Diagram
- To connect the breakout box and access the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals










Continue - Verification

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

Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Ignition on
- Read off the voltage from the system relay to the engine control module (ECM).
The voltage must be approximately 12 V.









Is the voltage correct?

Yes - VERIFIED

No - VERIFICATION FAILED

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

VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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

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 connectors and components

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