P0463-FUEL LEVEL SENSOR 1 CIRCUIT HIGH
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 at the PCM goes above 4.9 volts 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 BATTERY VOLTAGE |
| (N4) FUEL LEVEL SIGNAL CIRCUIT OPEN |
| (K310) SENSOR GROUND CIRCUIT OPEN |
| FUEL LEVEL SENSOR |
| CAN C BUS CIRCUITS OPEN OR SHORTED |
| BCM |
| PCM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1. FUEL LEVEL SENSOR VOLTS ABOVE 4.9 VOLTSNOTE: Diagnose and CAN C Bus communication DTCs before continuing.
Ignition on, engine not running.
With a scan tool, read the Fuel Level Sensor voltage.
Is the Fuel Level Sensor voltage above 4.9 volts?
Yes
- Go To 2
No
- Refer 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 electrical harness connector.
Ignition on, engine not running.
Connect a jumper wire between the (N4) Fuel Level Signal circuit and the (K310) Sensor ground circuit in the Fuel Pump Module harness connector.
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
- Replace the Fuel Level Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 3
NOTE: Remove the jumper wire before continuing.
3. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 BCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (N4) Fuel Level Signal circuit in the Fuel Pump Module harness connector.
Is the voltage above 5.2 volts?
Yes
- Repair the short to battery voltage in the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 4
4. (N4) FUEL LEVEL SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (N4) Fuel Level Signal circuit from the Fuel Pump Module harness connector to the C2 BCM 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. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5. (K310) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K310) Sensor ground circuit from the Fuel Pump Module harness connector to the C2 BCM harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go To 6
No
- Repair the open in the (K310) Sensor ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
6. BCM
NOTE: Before continuing, check the BCM 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 there any problems found?
Yes
- Repair as necessary.
- Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace and program the Body Control Module per Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)