Diagnosis Procedure

COOLING FAN


Description


COMPONENT DESCRIPTION

Cooling Fan Motor
The cooling fan operates at each speed when the current flows in the cooling fan motor as follows.








COOLING FAN


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.

Continuity should exist.

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.

Continuity should exist.

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.

Continuity should exist.

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.
5.CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident.
OK or NG
OK - INSPECTION END
NG - Repair or replace harness or connector.