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Diagnostic Procedure

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P0463-FUEL LEVEL SENSOR NO. 1 HIGH DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIII®, 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 SYMPTOM .
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
2 Turn the ignition off.
Disconnect the Fuel Pump Module electrical harness connector.
Connect a jumper wire between the (N4) Fuel Level Signal circuit and the (K900) Sensor ground circuit at the Fuel Pump Module harness connector.
Ignition on, engine not running.
With the DRBIII®, 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?
Yes --> Replace the Fuel Level Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 3
NOTE: Remove the jumper wire before continuing.
 All
3 Turn the ignition off.
Disconnect the C2 and C3 PCM harness connectors.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.

Ignition on, engine not running.
Measure the voltage on the (N4) Fuel Level Signal circuit at the Fuel Pump Module harness connector.
Is the voltage above 5.3 volts?
Yes --> Repair the short to voltage in the (N4) Fuel Level Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 4		 All
4 Turn the ignition off.
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.

Measure the resistance of the (N4) Fuel Level Signal circuit from the Fuel Pump Module harness connector to the appropriate terminal in special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 5
No --> Repair the open in the (N4) Fuel Level Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
5
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.
Measure the resistance of the (K900) Sensor ground circuit from the Fuel Pump Module harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?Yes --> Go To 6No --> Repair the open in the (K900) Sensor ground circuit.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
6
NOTE: Before continuing, check the PCM 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.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
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