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 Engine Coolant Temperature (ECT) and Intake Air Temperature (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.
- Check the Throttle Position (TP) sensor for proper operation. With the throttle blade fully at rest the monitored TP sensor voltage on a scan tool should be less than 0.85 volt. If the TP sensor is not near the expected voltage check for the following conditions:
- A faulty TP sensor.
- A faulty TP sensor circuit.
- A sticking throttle shaft or linkage/cable assembly.
- Check for proper operation of the Crankshaft Position (CKP) sensor.
- Check for proper operation of the MAP sensor (if equipped).