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 numbers below refer to the step numbers on the diagnostic test procedures.

1

The System Check MUST be performed before proceeding with this diagnostic test. Failure to perform the System Check will result in misdiagnosis.

2

With ignition on, with engine off, the Powertrain Control Module (PCM) should continuously illuminate the MIL.

3

The scan tool will command BOTH the PCM and the AF ECM to turn the MIL OFF.

5

This step tests if the MIL Input circuit is requesting MIL illumination. There should not be a MIL Input while the MIL is commanded OFF.