Signal Too Low

Signal too low

Checking the connectors and components
Check the battery voltage.
Check the charging function of the generator (GEN).
Check the engine control module (ECM) and system relay connectors. Check for contact resistance and oxidation.
Check the cable between system relay terminal #5 and control module terminal #A17 (#A17). 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) by clicking on the VCT2000 symbol.

Other information
- To fault-trace the charging system, see Fault-tracing and testing the voltage supply system Component Tests and General Diagnostics
- To connect the breakout box / access the control module, see Connecting the breakout box, B5254T2 Connecting the Test Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals









Continue - Verification

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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).
Check that the voltage is correct. The voltage must be approximately 12 V.









Is the voltage correct?

Yes - Verification completed

No - Fault-tracing information

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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 - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the connectors and components

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