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Symptom: P0645-A/C CLUTCH RELAY CIRCUIT When Monitored and Set Condition: P0645-A/C CLUTCH RELAY CIRCUIT When Monitored: With the ignition on. Battery voltage greater than 10 volts. A/C Switch on. Set Condition: An open or shorted condition is detected in the A/C clutch relay control circuit. One Trip Fault. POSSIBLE CAUSES A/C CLUTCH RELAY OPERATION (A17) FUSED IGNITION SWITCH OUTPUT CIRCUIT A/C CLUTCH RELAY RESISTANCE (C28) A/C CLUTCH RELAY CONTROL CIRCUIT OPEN (C28) A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, actuate the A/C Clutch Relay. Is the A/C Clutch Relay operating? All Yes → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. No → Go To 2 2 Turn the ignition off. All Yes → Go To 3 No → Repair the open or short to ground in the (A17) Fused Ignition Switch Output circuit. Check and replace any open fuses. 249 DRIVEABILITY - NGC |