Sensor Checks
WARNING: This page is about a different car, the 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Check the ECT sensor for proper operation by performing the following:
- Allow the engine temperature to reach ambient air temperature by leaving the engine OFF for several hours, overnight for most accurate results.
- Turn the ignition switch to RUN position while leaving the engine OFF.
- Using a scan tool, compare the ECT and IAT sensors displayed temperature. The sensors should be within 5°F (3°C) of each other.
- Replace the ECT sensor or repair the ECT sensor circuit if the ECT is not near the expected value.