Radiator Cooling Fan Motor: Testing and Inspection

ON-VEHICLE INSPECTION

HINT: The cooling fan may rotate when the ignition switch is turned from ACC to ON. This is normal.

1. CHECK COOLING FAN OPERATION WITH LOW TEMPERATURE (Below 83°C (181°F))
a) Turn the ignition switch ON.
b) Check that the cooling fan stops.
If not, check the cooling fan relay and ECT sensor, and check for disconnected connectors or wire breaks between the cooling fan relay and ECT sensor.
c) Disconnect the ECT sensor connector.
d) Check that the cooling fan rotates.
If not, check the fuses, cooling fan relay, ECM and cooling fan, and check for a short circuit between the cooling fan relay and ECT sensor.
e) Reconnect ECT sensor connector.
2. CHECK COOLING FAN OPERATION WITH HIGH TEMPERATURE (Above 98°C (208°F))
a) Start the engine, and raise ECT to above 98°C (208°F).
b) Check that the cooling fan rotates.
If not, replace the ECT sensor.
3. INSPECT COOLING FAN
a) Disconnect the cooling fan connector.
b) Connect battery and ammeter to the cooling fan connector.
c) Check that the cooling fan rotates smoothly, and check the reading on the ammeter.
Standard amperage: 4.9 to 8.5 A at 20°C (68°F)
If not, replace the cooling fan.
d) Reconnect the cooling fan connector.

INSPECTION
1. INSPECT RELAY (Marking: FAN NO. 1, FAN NO. 3)





a) Check the resistance of the relay.





Standard

If the result is not as specified, replace the relay.
2. INSPECT RELAY (Marking: FAN NO. 2)





a) Check the resistance of the relay.





Standard

If the result is not as specified, replace the relay.
3. INSPECT ENGINE COOLANT TEMPERATURE SENSOR





a) Check the resistance between terminals 1 and 2.





Standard

If the result is not as specified, replace the sensor.

NOTICE: When checking the ECT sensor in the water, the terminals should be kept dry. After the check, dry the sensor.