Engine Temperature Sensor: Testing and Inspection
ENGINE COOLANT TEMPERATURE (ECT) SWITCHINSPECTION
1. DRAIN ENGINE COOLANT
2. INSPECT NO.1 ECT SWITCH
a. Remove the No. 1 ECT switch.
b. Inspect the No. 1 ECT switch.
1. Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is above 98°C (208°F).
If there is no continuity, replace the switch.
2. Check that there is no continuity, between the terminals when the coolant temperature is below 88°C (190°F).
If there is continuity, replace the switch.
c. Reinstall the No. 1 ECT switch.
3. INSPECT NO.2 ECT SWITCH
a. Remove the No. 2 ECT switch.
b. Inspect the No. 2 ECT switch.
1. Using an ohmmeter, check that there is continuity between terminals when the coolant temperature is above 93°C (199°F).
If there is no continuity, replace the switch.
2. Check that there is no continuity between the terminals when the coolant temperature is below 83°C (181°F).
If there is continuity, replace the switch.
c. Reinstall the No. 2 ECT switch.
4. REFILL ENGINE COOLANT
5. START ENGINE AND CHECK FOR COOLANT LEAKS