The Engine Coolant Temperature (ECT) sensor's function is to advise the ECM of changes in engine temperature by monitoring the changes in coolant temperature. The sensor must be handled carefully during removal. It can be damaged (thereby affecting engine performance) by impact.
See Figures 1 and 2
- Disconnect the engine wiring harness from the ECT sensor.
- Connect an ohmmeter between the ECT sensor terminals.
- With the engine cold and the ignition switch in the OFF position, measure and note the ECT sensor resistance.
- Connect the engine wiring harness to the sensor.
- Start the engine and allow the engine to reach normal operating temperature.
- Once the engine has reached normal operating temperature, turn the engine OFF .
- Once again, disconnect the engine wiring harness from the ECT sensor.
- Measure and note the ECT sensor resistance with the engine hot.
- Compare the cold and hot ECT sensor resistance measurements with the accompanying chart.
- If readings do not approximate those in the chart, the sensor may be faulty.
REMOVAL & INSTALLATION
See Figures 3, 4, 5 and 6
- Drain the engine coolant.
- Disconnect the ECT sensor wiring.
- Remove the sensor and gasket.
- Install the new sensor with gasket. Tighten the sensor to 17 ft. lbs. (25 Nm).
- Connect the wiring to the sensor.
- Refill the engine with coolant and water mixture.