P0686

P0686

ECM/PCM Power Relay Control Circuit Low

Diagnostic conditions
- Ignition on

Possible cause of fault
- Short circuit to B+
- Short circuit to ground
- DME main relay faulty
- DME control module faulty

Affected terminals
DME control module connector A, pins 23 and 3

NOTE:
- NO CLASSIC OUTPUT-STAGE DIAGNOSIS.
- The diagnosis compares the voltage used to activate the main relay with the voltage after the relay is activated.

Diagnosis/troubleshooting