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
  
(K900) SENSOR GROUND CIRCUIT OPEN
  
FUEL LEVEL SENSOR
  
TIPM
  

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 VOLTS

NOTE: Diagnose any CAN - B and CAN - C Communication DTCs before continuing.





Is the Fuel Level Sensor voltage above 4.9 volts?

Yes
  • Go To 2


No

2.FUEL LEVEL SENSOR









Did the Fuel Level voltage change from approximately 5 volts to 0 volts?

Yes


No
  • Go To 3

    NOTE: Remove the jumper wire before continuing.


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








Is the voltage above 0 volts?

Yes


No
  • Go To 4

4.(N4) FUEL LEVEL SIGNAL CIRCUIT OPEN






Is the resistance below 5.0 ohms?

Yes
  • Go To 5


No

5.(K900) SENSOR GROUND CIRCUIT OPEN




CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.




Is the resistance below 5.0 ohms?

Yes
  • Go To 6


No

6.TOTALLY INTEGRATED POWER MODULE

NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.





Were any problems found?

Yes


No