Radiator Cooling Fan: Testing and Inspection

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.




Component Function Check
1.CHECK COOLING FAN FUNCTION
With CONSULT-III
1. Turn ignition switch ON.
2. Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-III.
3. Touch "LOW" and "Hi" on the CONSULT-III screen.
4. Check that cooling fan operates at each speed.
Without CONSULT-III
1. Perform IPDM E/R auto active test and check cooling fan motor operation. Auto Active Test.
2. Check that cooling fan operates at each speed.
Is the inspection result normal?
YES - INSPECTION END
NO - SEE Diagnosis Procedure.




Wiring Diagram














Diagnosis Procedure
1.CHECK IPDM E/R POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E44.





3. Check the voltage between IPDM E/R harness connector and ground.





OK or NG
OK - GO TO 3.
NG - GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
- 50 A fusible link (letter J)
- Harness for open or short between IPDM E/R and battery
- Repair open circuit or short to ground in harness or connectors.
3.CHECK IPDM E/R GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connectors E46 and E48.
3. Check the continuity between IPDM E/R harness connector and ground.





4. Also check harness for short to power.
OK or NG
OK (Models with A/C)-GO TO 4.
OK (Models without A/C)-GO TO 6.
NG - Repair open circuit or short to power in harness or connectors.
4.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 8.
NG - GO TO 5.
5.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
- Resistor E5
- Repair open circuit or short to ground or short to power in harness or connectors.
6.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 8.
NG - GO TO 7.
7.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.
8.CHECK COOLING FAN MOTOR
SEE Component Inspection.
OK or NG
OK - GO TO 9.
NG - Replace cooling fan motor. Removal and Replacement.
9.CHECK INTERMITTENT INCIDENT
Perform Trouble Diagnosis For Intermittent Incident.
OK or NG
OK - Replace IPDM E/R. Service and Repair.
NG - Repair or replace harness or connector.




Component Inspection

COOLING FAN MOTOR

Model with A/C





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. Removal and Replacement Disassembly and Assembly, "Removal and
Installation".

Models without A/C





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. Removal and Replacement.