Circuit/System Testing
- Ignition OFF, disconnect the fuel level sensor connector.
- Ignition ON, with the scan tool observe the Fuel Tank Level Remaining parameter. Verify the Fuel Tank Level remaining parameter is 4 percent or less.
- If the Fuel Tank Level Remaining parameter indicates a value greater than 4 percent, test the fuel level sensor signal circuit for a short to ground. If the fuel level sensor circuit tests normal, replace the ECM.
- If all circuits tests normal, test or replace the fuel level sensor.