Radiator Cooling Fan Motor: Testing and Inspection

COOLING FAN SYSTEM
ON-VEHICLE INSPECTION
1. CHECK COOLING FAN OPERATION AT A 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 engine coolant temperature sensor. Check for disconnection or circuit open between them.
c. Disconnect the engine coolant temperature sensor connector.
d. Check that the cooling fan rotates.
If not, check the fuses, cooling fan relay, ECM and cooling fan. Check for short in a circuit between the cooling fan relay and engine coolant temperature sensor.
e. Reconnect the engine coolant temperature sensor connector.
2. CHECK COOLING FAN OPERATION AT A HIGH TEMPERATURE (Above 93°C (199°F))
a. Start the engine, and raise coolant temperature to above 93°C (199°F).

HINT: Coolant temperature is detected by the engine coolant temperature sensor on the water outlet.

b. Check that the cooling fan rotates.
If not, replace the engine coolant temperature sensor.
3. INSPECT COOLING FAN
a. Disconnect the cooling fan connector.
b. Connect a battery and ammeter to the cooling fan.
c. Check that the cooling fan rotates smoothly. Also, check the reading on the ammeter.
Standard amperage: 11.7 to 14.7 A
d. Reconnect the cooling fan connector.

INSPECTION





1. INSPECT COOLING FAN RELAY
a. Inspect the resistance.
1. Using an ohmmeter, measure the resistance between the terminals.





Specified condition

If the result is not as specified, replace the cooling fan relay.





2. INSPECT COOLING FAN RELAY NO.2
a. Inspect the resistance.
1. Using an ohmmeter, measure the resistance between the terminals.





Specified condition

If the result is not as specified, replace the cooling fan relay No. 2.
3. INSPECT COOLING FAN RESISTOR
a. Using an ohmmeter, measure the resistance between the terminals.
Resistance: 1.17 to 1.43 ohms at 20°C (68°F)