Test Description

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

1. 1
   
   The System Check MUST be performed before proceeding with this diagnostic test. Failure to perform the System Check will result in misdiagnosis.
2. 2
   
   With ignition on, with engine off, the Powertrain Control Module (PCM) should continuously illuminate the MIL.
3. 3
   
   The scan tool will command BOTH the PCM and the AF ECM to turn the MIL OFF.
4. 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.