2014 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P0463-FUEL LEVEL SENSOR 1 CIRCUIT HIGH

For a complete wiring diagram, refer to the Wiring Information.


Theory of Operation

The Fuel Level Sensor information is a bussed message to the Powertrain Control Module (PCM) from the Totally Integrated Power Module (TIPM).


Possible Causes

CAN BUS FAILURE
FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE TIPM
FUEL TANK
OBSTRUCTION TO THE FUEL LEVEL SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. ACTIVE DTC



NOTE: Diagnose any Communication DTCs before continuing.
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With the scan tool, select View DTCs.

NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.


Is the DTC Active or Pending at this time?

Yes


No


2. VISUALLY INSPECT FUEL TANK

1. Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving.


Is the Fuel Tank OK?

Yes


No


3. FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE TIPM



Are any Fuel Level Sensor Circuit DTCs set in the TIPM?

Yes


No


4. INTERNAL INSPECTION OF THE FUEL TANK

WARNING:

The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury.

1. Remove the Fuel Tank in accordance with the Service Information. (Refer to 14 - Fuel System/Fuel Delivery/TANK, Fuel - Removal) .
2. Remove the Fuel Pump Module. (Refer to 14 - Fuel System/Fuel Delivery/MODULE, Fuel Pump - Removal) .
3. Visually inspect the inside of the Fuel Tank for any obstructions or deformities.
4. Inspect the Fuel Pump Module Float arm for damage.


Were any problems found?

Yes


No


5. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Totally Integrated Power Module (TIPM) and the Powertrain Control Module (PCM).
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 Sensor and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.


Were there any problems found?

Yes


No