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Symptom: P0645-A/C CLUTCH RELAY CIRCUIT SHORT CIRCUIT When Monitored and Set Condition: P0645-A/C CLUTCH RELAY CIRCUIT SHORT CIRCUIT When Monitored: With the ignition on. Set Condition: The ECM detects a short to voltage on the A/C Clutch Relay Control circuit. POSSIBLE CAUSES A/C CLUTCH RELAY INTERMITTENT OPERATION INTERMITTENT CONDITION FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN INTEGRATED POWER MODULE A/C CLUTCH RELAY IPM FUSE/RELAY CENTER A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE ECM TEST ACTION APPLICABILITY 1 NOTE: If the ECM detects and stores a DTC, the ECM also stores the t, actuate the A/C Clutch Relay. Does the A/C Clutch Relay cycle on and off? All Yes → Go To 2 No → Go To 4 2 Turn the ignition on. t, actuate the A/C Clutch Relay. Wiggle the wiring harness from the A/C Clutch Relay to the ECM. All Yes → Repair as necessary. Perform ROAD TEST VERIFICATION - VER-2. No → Go To 3 151 DRIVEABILITY - DIESEL |