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 engine coolant leaks.