Coolant Temperature Sensor / Switch HVAC: Testing and Inspection
ENGINE COOLANT TEMPERATURE (ECT) SWITCHINSPECTION
1. DRAIN ENGINE COOLANT FROM RADIATOR
HINT: It is not necessary to drain out all coolant.
2. REMOVE ECT SWITCH
a. Remove the RH engine under cover
b. Disconnect the ECT switch connector.
c. Remove the ECT switch
3. INSPECT ECT SWITCH CONTINUITY
a. Using an ohmmeter, check no continuity exists between terminals when the coolant temperature is above 90 °C (194 °F).
If continuity exists, replace the switch.
b. Using an ohmmeter, check continuity exists between terminals when the coolant temperature is below 83 °C (181 °F).
If no continuity exists, replace the switch.
4. REINSTALL ECT SWITCH
a. Install a new O-ring with the ECT switch.
Torque: 7.4 N.m (75 kg.cm, 65 in.lb)
b. Connect the ECT switch connector.
c. Install the RH engine under cover.
5. REFILL WITH ENGINE COOLANT