Temperature Sensor (Gauge): Testing and Inspection

ECT Sending Unit Testing
1. Remove the engine cover.





2. Disconnect the YEL/GRN wire from the ECT sending unit.





3. Using an ohmmeter, measure the change in resistance between the positive terminal and the engine (ground) with the engine cold and with the engine at operating temperature.
4. If the obtained readings are substantially different from the specifications, inspect the coolant level and the cooling system. If the cooling system is OK, replace the sending unit.