Test Description

Number(s) below refer to the step number(s) on the Diagnostic Chart:
1. The MIL ("Check Engine" lamp) should be "ON" steady with the ignition "ON"/engine "OFF" If not, Chart A-1 should be used to isolate the malfunction.
2. Checks the Class 2 data circuit and ensures that the PCM is able to transmit serial data.
3. This test ensures that the PCM is capable of controlling the MIL ("Check Engine" lamp) and the MIL ("Check Engine" lamp) driver circuit is not shorted to ground.
4. If the engine will not start, the Cranks But will Not Run chart should be used to diagnose the condition.
7. A scan tool parameter which is not within the typical range may help to isolate the area which is causing the problem.
10. This vehicle is equipped with a PCM which utilizes an electrically erasable programmable read only memory (EEPROM). When the PCM is replaced, the new PCM must be programmed. Refer to PCM Replacement and Programming Procedures in Powertrain Control Module (PCM) and Sensors.

PAGE REFERENCE:

On-Board Diagnostic (OBD II) System Check