P0645 A/C Clutch Relay Circuit

SYMPTOM
P-0645 A/C CLUTCH RELAY CIRCUIT

WHEN MONITORED
With the ignition key on and battery voltage greater than 10 volts.

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

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- A/C clutch relay resistance >= 100 ohms
- A/C clutch relay ckt wiring harn observable def
- A/C clutch relay control circuit open
- A/C clutch relay control circuit short to ground
- AC clutch rly ckt wiring harn intermittent def
- PCM defective