Test Description

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

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.