Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection

INSPECTION





1. Drain engine coolant.
2. Remove ECT switch.
a. Disconnect the connector.
b. Remove the ECT switch.
c. Remove the O-ring from the ECT switch.





3. Inspect ECT switch.
a. Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 93 °C (199°F).
If there is continuity, replace the switch.
b. Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 83°C (181°F).
If there is no continuity, replace the switch.
4. Reinstall ECT switch.
a. Install a new O-ring to the ECT switch.
b. Install the ECT switch.
c. Connect the connector.
5. Refill with engine coolant.
6. Start engine and check for coolant leaks radiator fan main relay.