Code 68 - A/C Relay Circuit Shorted
When ECM detects A/C has been requested, ECM will activate A/C clutch relay. When relay is activated, voltage should be present at both A/C compressor clutch and A/C clutch status terminal at ECM. If ECM detects voltage on A/C status line when A/C has not been commanded on, Code 68 will set. A short to voltage anywhere on A/C status line, or stuck relay contacts, will set Code 68. When Code 68 is set, ECM does not turn on SERVICE ENGINE SOON light.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Code 68 sets if voltage is detected on A/C status line for more than 20 seconds after ECM has disengaged A/C relay.
- This step will isolate ignition feed portion of circuit from clutch circuit.
- If Code 68 reappears at this step, ECM is internally shorted to voltage.