For a complete wiring diagram Refer to Section 8W.When Monitored:Ignition on and battery voltage above 10.4 volts.Set Condition:The fuel level sensor signal voltage goes below 0.4 of a volt for more than 90 seconds. One Trip Fault. Three good trips to turn off the MIL.Possible Causes(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUITFUEL LEVEL SENSORTIPMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. FUEL LEVEL SENSOR VOLTAGE BELOW 0.4 OF A VOLTDiagnose any CAN - B or CAN -C Communication DTCs before continuing.Ignition on, engine not running.With the scan tool, read the Fuel Level Sensor voltage.Is the Fuel Level Sensor voltage below 0.4 of a volt?YesGo To 2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. FUEL LEVEL SENSOR

Turn the ignition off.Disconnect the Fuel Pump Module harness connector.Ignition on, engine not running.Using a fused jumper wire, jump the (K900) Sensor Ground circuit to the (N4) Fuel Level Sensor No.1 Signal circuit in the Fuel Pump Motor harness connector.Did the Fuel gauge level change from empty to full?YesReplace the Fuel Level Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoGo To 33. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Turn the ignition off.Disconnect the C7 TIPM harness connector.Measure the resistance between ground and the (N4) Fuel Level Signal circuit in the Fuel Pump Module harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (N4) Fuel Level Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoGo To 44. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Measure the resistance between the (N4) Fuel Level Signal circuit and the (K900) Sensor Ground circuit from the Fuel Pump Module harness connector.Is the resistance below 5.0 ohms?YesRepair the short between the (K900) Sensor Ground circuit and the (N4) Fuel Level Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoGo To 5 5. TOTALLY INTEGRATED POWER MODULEBefore continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Totally Integrated Power Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)