Diagnosis Procedure

COOLING FAN


Description

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].

COOLING FAN MOTOR

Models without A/C
The cooling fan operates at each speed when the current flows in the cooling fan motor as per the following.






Models with A/C
The cooling fan operates at high (HI) speed when the current flows, and operates at low (LOW) speed when cooling fan motor and the resistor are circuited in series.





COOLING FAN


Diagnosis Procedure

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E21. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connection.
2.CHECK COOLING FAN MOTOR CIRCUIT
1. Disconnect cooling fan motor harness connector.
2. Check the continuity between IPDM E/R harness connector and cooling fan motor harness connector.





3. Check the continuity between cooling fan motor harness connector and ground.





4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 4.
NG - GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between cooling fan motor and IPDM E/R
- Harness for open or short between cooling fan motor and ground
- Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK COOLING FAN MOTOR
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 - Replace IPDM E/R. With I-Key (WITH I-Key) or Without I-Key (WITHOUT I-Key).
NG - Repair or replace harness or connector.