Fuel Gage Inaccurate or Inoperative

FUEL GAGE INACCURATE OR INOPERATIVE

DIAGNOSTIC AIDS
- Ensure that the fuel level is in the same range as the customer concern.
- For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
- Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Tank Level Remaining (%) parameter is available on the scan tool in the engine control module (ECM) enhanced evaporative emission (EVAP) data list.

IMPORTANT: When inspecting for a deformed or warped fuel tank, measure the resistance of the suspect fuel level sensor at empty, with the sensor in the fuel tank, and again with the sensor removed from the fuel tank. The measured resistance values should be the same at empty. If the measured resistance values are not the same, refer to Fuel Tank Replacement - Left or Fuel Tank Replacement - Right for the 6.0L engine.

TEST DESCRIPTION

Step 1 - Step 4:

Step 5 - Step 13:

Step 14 - Step 18:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sensor.
13. DTCs will be set in the ECM when you perform this diagnostic table.