Inspection of Electric Cooling Fan Components

1. Inspect coolant fan ECC for circuit






Disconnect the cooling fan ECU, and check the connector on the wiring harness side as shown in the chart.






2. Inspect water temperature sensor

Using an ohmmeter, measure the resistance between the terminals.

Resistance:
Approx. 1.53 k/ohms at 80°C (176°F)
Approx. 1.18 k/ohms at 90°C (194°F)
Approx. 1.03 k/ohms at 95°C (203°F)

If resistance is not as specified, replace the sensor.

3. Inspect engine main relay
4. Inspect No.1 cooling fan relay ("FAN NO.1")






5. Inspect No.2 cooling fan relay ("A/C FAN NO.2")

A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuity between terminals 2 and 6.
(b) Check that there is continuity between terminals 1 and 3.
(c) Check that there is no continuity between terminals 1 and 4.

If continuity is not as specified, replace the relay.






B. Inspect relay operation
(a) Apply battery voltage across terminal 2 and 6.
(b) Using an ohmmeter, check that there is no continuity between terminals 1 and 3.
(c) Check that there is continuity between terminals 1 and 4.

If operation is not as specified, replace the relay.

6. Inspect No.3 cooling fan relay ("A/C FAN NO.3")






7. Inspect cooling fan motors
(a) Connect battery and ammeter to the fan motor connector.
(b) Check that the fan motor rotates smoothly, and check the reading on the ammeter.

Standard amperate: No.1 12.1 - 15.1 A
No.2 6.0 - 7.4 A