Test Description

WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The number below refer to the step number on the diagnostic procedure.

2

Ensure that the engine can reach proper operating temperature in a timely manner before continuing with ECT sensor diagnosis.

3

This step determines if the AF ECM can monitor an open ECT signal circuit (high voltage).

4

This step determines if the AF ECM can monitor a shorted ECT signal circuit (low voltage).

5

This step determines if the ECT sensor is accurately monitoring engine coolant temperature.