P0645

Tests 1 - 3:

Tests 4 - 8:

SYMPTOM
P0645 - 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 circuit wiring harness observable defect
- A/C clutch relay control circuit open
- A/C clutch relay control circuit shorted to ground
- A/C clutch relay circuit wiring harness intermittent defect
- PCM defective