Radiator Cooling Fan: Testing and Inspection
COOLING FAN SYSTEMON-VEHICLE INSPECTION
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 engine coolant temperature sensor, and check if there is 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, and check for short in the circuit between the cooling fan relay and engine coolant temperature sensor.
e. Reconnect the engine coolant temperature sensor connector.
2. CHECK COOLING FAN OPERATION WITH 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 an ammeter to the cooling fan.
c. Check that the cooling fan rotates smoothly, and 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)