TrailBlazer 4WD L6-4.2L VIN S (2002)
Malfunction Indicator Lamp (MIL) Inoperative - Steps 8-14
The numbers below refer to the step numbers on the diagnostic table.
3. This step determines if the condition is with the MIL control circuit or the PCM.
4. This step determines if a voltage is constantly being applied to the control circuit.