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EC-390 < COMPONENT DIAGNOSIS > [VQ40DE] COOLING FAN COOLING FAN Description INFOID:0000000004297633 COMPONENT DESCRIPTION Cooling Fan Motor The cooling fan operates at each speed when the current flows in the cooling fan motor as follows. Diagnosis Procedure INFOID:0000000004297634 1. CHECK IPDM E/R GROUND CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect IPDM E/R harness connectors E122, E124. 3. Check harness continuity between IPDM E/R terminals 38, 59 and ground. 4. Also check harness for short to power. OK or NG OK >> GO TO 2. NG >> Repair open circuit or short to power in harness or connectors. 2. CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN AND SHORT 1. Disconnect cooling fan motor harness connector. 2. Check harness continuity between the following; 3. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 3. CHECK COOLING FAN MOTER GROUND CIRCUIT FOR OPEN OR SHORT 1. Check harness continuity between the following; 2. Also check harness for short to power. OK or NG OK >> GO TO 4. NG >> Repair open circuit or short to power in harness or connectors. Cooling fan speed Cooling fan motor terminals (+) ( − ) Low (LOW) 1 3 and 4 2 3 and 4 High (HI) 1 and 2 3 and 4 Continuity should exist. Continuity should exist. BBIA0555E Continuity should exist. 2009 Pathfinder |