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Symptom: P1491-RAD FAN CONTROL RELAY CIRCUIT POSSIBLE CAUSES RADIATOR FAN CONTROL RELAY CIRCUIT WIRE HARNESS INTERMITTENT PROBLEM RADIATOR FAN CONTROL RELAY CIRCUIT WIRE HARNESS OBSERVABLE PROBLEM RADIATOR FAN RELAY GROUND CIRCUIT OPEN RAD FAN RELAY CONTROL CIRCUIT OPEN RADIATOR FAN RELAY CONTROL CIRCUIT SHORT TO GROUND RADIATOR FAN CONTROL RELAY PCM TEST ACTION APPLICABILITY 1 Turn the ignition on. t, actuate the Radiator Fan Relay. Does the Radiator Fan Motor Cycle on and off? All Yes → No → 2 Turn the ignition on. t, actuate the Radiator Fan Relay. Wiggle the wiring harness from the Radiator Fan Relay connector to the PCM All Yes → Repair as necessary where wiggling caused the cycling to be No → 3 Turn the ignition off. All Yes → Repair as necessary. No → Test Complete. 4 Turn the ignition off. All Yes → No → Repair the open Ground Circuit. 180 DRIVEABILITY - GAS |