Radiator Cooling Fan: Testing and Inspection

ELECTRICALLY-CONTROLLED COOLING FAN COUPLING





Component Function Check
1.CHECK COOLING FAN FUNCTION
WITH CONSULT-III
1. Start the engine.
2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode with CONSULT-III.
3. Check that cooling fan speed varies according to the percentage.

NOTE:
Speed changes gradually as the percentage changes.
WITHOUT CONSULT-III
1. Start the engine and warm up the engine until engine coolant temperature reaches at least 98�C (209�F).
2. Check that cooling fan speed increase.
Is the inspection result normal?
YES - INSPECTION END
NO - Proceed to SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK DRIVE BELT
1. Turn ignition switch OFF.
2. Check that the drive belt is not broken.
Is inspection result normal?
YES - GO TO 2.
NO - Replace drive belt.
2.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING POWER SUPPLY
1. Disconnect electrically-controlled cooling fan coupling harness connector.
2. Turn ignition switch ON.
3. Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.





Is inspection result normal?
YES - GO TO 3.
NO - Perform trouble diagnosis for power supply circuit.
3.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check the continuity between electrically-controlled cooling fan coupling harness connector and ground.





Is inspection result normal?
YES - GO TO 4.
NO - Repair or replace error-detected parts.
4.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL SIGNAL
WITH CONSULT-III
1. Start the engine.
2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode of "ECM" with CONSULT-III.
3. Set the Duty value to 100%.
4. Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.

CAUTION:
Wait for 1 minute or more to measure.






WITHOUT CONSULT-III
1. Start the engine and warm up the engine until engine coolant temperature reaches at least 98�C (209�F).
2. Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.

CAUTION:
Wait for 1 minute or more to measure.






Is the inspection result normal?
YES - GO TO 7.
NO - GO TO 5.
5.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between electrically-controlled cooling fan coupling harness connector and IPDM E/R harness connector.





4. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace error-detected parts.
6.CHECK CAN COMMUNICATION
Trouble Diagnosis Flow Chart.
Is inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Repair or Replace error-detected parts.
7.CHECK COOLING FAN SPEED SENSOR
P0527.
Is inspection result normal?
YES - Replace electrically-controlled cooling fan coupling. Removal and Installation.
NO - Repair or replace error-detected parts.