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?

▶ 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.

▶ If voltage fluctuates, check circuit for loose, bent or corroded terminals, Repair as necessary and go to "Verification of Vehicle Repair" procedure.

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