P0645

Tests 1 - 3:

Tests 4 - 8:

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 problem
- A/C clutch relay circuit wiring harness intermittent problem
- Fused ignition switch output circuit open
- A/C clutch relay control circuit open
- A/C clutch relay control circuit short to ground
- A/C clutch relay
- PCM (A/C clutch relay)