Powertrain Control Module (PCM), NGC

P0463-FUEL LEVEL SENSOR 1 CIRCUIT HIGH







- When Monitored:
Ignition on and battery voltage above 10.4 Volts.

- Set Condition:
The fuel level sensor signal voltage is greater than the maximum acceptable value. One Trip Fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC

NOTE: Diagnose and repair any system voltage DTCs before continuing with this test.

NOTE: Diagnose and repair any communication DTCs before continuing with this test.

1. Start the engine and allow it to reach operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

2. With the scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition Test

2. FUEL LEVEL SENSOR




1. Turn the ignition off.
2. Disconnect the Fuel Pump Module electrical harness connector.
3. Ignition on, engine not running.
4. Connect a jumper wire between the (N4) Fuel Level Signal circuit and the (G109) Ground circuit in the Fuel Pump Module harness connector.
5. With the scan tool, read the Fuel Level Sensor voltage.

Did the Fuel Level Sensor voltage change from above 4.8 Volts to below 0.4 of a volt with the jumper wire installed?

Yes

- Verify that there is good pin to terminal contact at the Fuel Pump Module and the Totally Integrated Power Module (TIPM) connectors. Replace the Fuel Level Sensor if no problems were found at the connectors.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 3 NOTE: Remove the jumper wire before continuing.


3. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the C7 TIPM harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (N4) Fuel Level Signal circuit in the Fuel Pump Module harness connector.

Is there any voltage present?

Yes

- Repair the short to voltage in the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 4

4. (N4) FUEL LEVEL SIGNAL CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the C7 TIPM harness connector.
3. Measure the resistance of the (N4) Fuel Level Signal circuit from the Fuel Pump Module harness connector to the C7 TIPM harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

- Repair the open in the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

5. (G109) GROUND CIRCUIT OPEN




1. Disconnect the C7 TIPM harness connector.
2. Measure the resistance of the (G109) Ground circuit from the Fuel Pump Module harness connector to the C7 TIPM harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 6

No

- Repair the open in the (G109) Ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

6. TOTALLY INTEGRATED POWER MODULE
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pump Module and the Totally Integrated Power Module.
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Fuel Pump Module and the Totally Integrated Power Module connectors.
4. Search for any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST, Body Verification Test.

No

- Replace and program the Totally Integrated Power Module.
- Perform the BODY VERIFICATION TEST Body Verification Test