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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 550 (DTCS P0463 To P0573) >> Diagnosis And Testing >> P0463-Fuel Level Sensor 1 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  FUEL LEVEL SENSOR VOLTS ABOVE 4.9 VOLTS 
    NOTE: Diagnose any CAN - B and CAN - C 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 

    1. Go To step  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2)  FUEL LEVEL SENSOR 

    Turn the ignition off.

    Disconnect the Fuel Pump Module electrical harness connector.

    Ignition on, engine not running.

    Did the Fuel Level gauge change from full to empty? 

    Yes 

    1. Replace the Fuel Level Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  3).
  3. 3)  (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 1: Checking Fuel Level Signal Circuit
    GC0027132Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C1 Cluster 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 0 volts? 

    Yes 

    1. Repair the short to battery voltage in the (N4) Fuel Level Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  4).
  4. 4)  (Z910), (Z210) GROUND CIRCUIT OPEN 
    Fig 2: Checking Ground Circuit
    GC0027129Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Using a 12-volt test light connected to B+, probe (Z910) and (Z210) Ground circuits at the Fuel Pump Module harness connector.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the open in the (N4) Fuel Level Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  INSTRUMENT CLUSTER 
    NOTE: Before continuing, check the Instrument Cluster 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 

    1. Repair as necessary.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace and program the Instrument Cluster per Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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