PCM Controlled Warning Lamps Diagnosis

Diagnostic Aids
^ An Intermittent problem may be caused by a PC connection, rubbed through wire insulation, or a wire that is broken inside the insulation.
^ Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for the following items:
- Improper mating
- Broken locks
- Poor terminal to wiring connections
- Physical damage to the wiring harness

Test Description
The number(s) below refer(s) to the step number(s) on the Diagnostic Table.
1. The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the fault occurred. The scan tool stores this data for later reference.
3. If the volts telltale lamp is not operating, the IPC or the BFC is malfunctioning.
6. If no malfunctions are present at this point, refer to Diagnostic Aids for additional checks and information.