Test Description
The numbers below refer to the step numbers in the diagnostic procedures.
- 1 - MIL (CHECK ENGINE LIGHT) should be ON steady when ignition is in ON position. If MIL does not illuminate as specified, repair as necessary. See NO MALFUNCTION INDICATOR LIGHT (CHECK ENGINE LIGHT) under MALFUNCTION INDICATOR LIGHTS.
- 2 - Reduced Power Light (RPL) should be ON steady when ignition is in ON position. If RPL does not illuminate as specified, repair as necessary. See NO REDUCED POWER LIGHT under MALFUNCTION INDICATOR LIGHTS.
- 3 - This step checks that Class 2 serial data circuit and ensures that ECM is able to transmit serial data.
- 4 - This test ensures that ECM is capable of controlling MIL, and MIL driver circuit is not shorted to ground.
- 5 - This test ensures that ECM is capable of controlling RPL, and RPL driver circuit is not shorted to ground.
- 7 - This step checks for system or voltage supply DTCs.
- 8 - This step checks for ECM software errors.
- 10 - If starter motor will not start, repair as necessary. See STARTER article under ENGINE.
- 11 - If engine will not start and no DTCs are stored. Perform ENGINE CRANKS BUT WILL NOT RUN test in TROUBLESHOOTING - NO CODES article.
- 14 - A scan tool parameter not in typical range may help isolate area causing problem.
- 15 - Vehicle is equipped with a Electrically Erasable Programmable Read Only Memory (EEPROM). When ECM is replaced, the new ECM must be programmed. See EEPROM PROGRAMMING PROCEDURE under POWERTRAIN CONTROL MODULE.