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Symptom: P0480-FAN 1 CONTROL CIRCUIT OPEN CIRCUIT When Monitored and Set Condition: P0480-FAN 1 CONTROL CIRCUIT OPEN CIRCUIT When Monitored: With the ignition on. Set Condition: The ECM detects an open or short to ground on the Radiator Fan Relay No. 1 Control circuit. POSSIBLE CAUSES INTERMITTENT CONDITION ECM/PCM RELAY OUTPUT CIRCUIT OPEN RADIATOR FAN RELAY NO. 1 LOW SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO GROUND LOW SPEED RADIATOR FAN CONTROL CIRCUIT OPEN ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 NOTE: If the ECM detects and stores a DTC, the ECM also stores the All Yes → Go To 2 No → Go To 3 83 DRIVEABILITY - DIESEL |