Radiator Cooling Fan: Testing and Inspection

Cooling Fan Circuit Check

Description

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

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.
Refer to Wiring Diagram.






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;
cooling fan motor terminal 1 and IPDM E/R terminal 20,
cooling fan motor terminal 2 and IPDM E/R terminal 24.
Refer to Wiring Diagram.






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 MOTOR GROUND CIRCUIT FOR OPEN OR SHORT

1 Check harness continuity between the following;
cooling fan motor terminal 3 and ground,
cooling fan motor terminal 4 and ground.
Refer to Wiring Diagram.






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.

4. CHECK COOLING FAN MOTOR

Refer to "Component Inspection".

OK or NG
OK
GO TO 5.
NG
Replace cooling fan motor. Refer to [Engine Cooling Fan: Exploded View] Engine Cooling Fan Exploded View.

5. CHECK INTERMITTENT INCIDENT

Perform [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.

OK or NG
OK
INSPECTION END
NG
Repair or replace harness or connector.

Component Inspection

Cooling Fan Motor

1) Disconnect cooling fan motor harness connectors.





2) Supply cooling fan motor terminals with battery voltage and check operation.





Cooling fan motor should operate.

If NG, replace cooling fan motor.