System Inspection

■ Back-Up Voltage Inspection 

1. Ignition "OFF"
2. Disconnect PCM/ECM connector.
3. Ignition "ON"
4. Measure voltage between terminal Memory Power of the PCM/ECM harness connector and chassis ground.

   Specification:  Remain stable at battery voltage

5. Are circuits remaining stable at battery voltage?

   YES 

   • Using a GDS, check PCM/ECM software version and upgrade as necessary. If version is the newest one, check PCM/ECM for contamination, deterioration, or damage. Substitute with a known-good PCM/ECM and check for proper operation. If the problem is corrected, replace PCM/ECM 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.