P0645

Tests 670 - 674:

Tests 675 - 677:

SYMPTOM
P0645 - A/C CLUTCH RELAY CIRCUIT

WHEN MONITORED
With the ignition key in the RUN position and battery voltage above 10 volts.

SET CONDITION
An open or shorted condition is detected in the A/C clutch relay control circuit.

POSSIBLE CAUSES
- A/C clutch relay circuit wiring harness observable defective
- A/C clutch relay circuit wiring harness intermittent defective
- Fused ignition switch output circuit open
- A/C clutch relay control circuit open
- A/C clutch relay control circuit shorted to ground
- A/C clutch relay defective
- PCM defective (A/C clutch relay)