System Inspection

Back-Up Voltage Inspection
1. Ignition "OFF"
2. Disconnect PCM connector.
3. Ignition "ON"
4. Measure voltage between terminal 6 of the PCM harness connector and chassis ground.
  Specification : Remain stable at battery voltage
5. Are circuits remaining stable at battery voltage?
  YES
  - Using a scan tool, check PCM software version and upgrade as necessary. If version is the newest one, check PCM for contamination, deterioration, or damage. Substitute with a known-good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to VERIFICATION OF VEHICLE REPAIR procedure.
  NO
  - If voltage fluctuates, check circuit for loose, bent or corroded terminals, Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.