System Inspection
- Back up Voltage Inspection
- Ignition "OFF".
- Disconnect ECM connector.
- Ignition "ON".
- Measure voltage between terminal 6 of the ECM harness connector and chassis ground.
Specification: Remain stable at battery voltage
- Are circuits remaining stable at battery voltage?
YES
- Using a scan tool, check ECM software version and upgrade as necessary. If version is the newest one, check ECM for contamination, deterioration, or damage. Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- After TPS adaptation, the system normality should be confirmed by reading out "FMY" on the Scan Tool.
NO
- If voltage fluctuates, check circuit for loose, bent or corroded terminals, Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.