Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the secondary fuel level sensor.
- Ignition ON, scan tool installed, verify that the scan tool Fuel Tank Level Remaining parameter is greater than 98 percent.
- If less than 98 percent, test the secondary signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
- If all circuits test normal, perform the fuel level sensor component test before replacing the secondary (left) fuel level sensor.