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Symptom: P0481-FAN 2 CONTROL CIRCUIT OPEN CIRCUIT When Monitored and Set Condition: P0481-FAN 2 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 2 Control circuit. POSSIBLE CAUSES INTERMITTENT CONDITION ASD RELAY OUTPUT CIRCUIT OPEN HIGH SPEED RADIATOR FAN RELAY HIGH SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO GROUND HIGH 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 96 DRIVEABILITY - DIESEL |