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Home >> Dodge and Ram >> 2002 >> Durango R/T, 5.9 Z >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - NGC >> Diagnostic Tests >> DTC P0463: Fuel Level Sensor #1 High >> Testing

DTC P0463: Fuel Level Sensor #1 High: Testing

  1. Turn the ignition on, with the engine off. With the DRBIII(R), read the Fuel Level Sensor voltage. Is the Fuel Level Sensor voltage more than 4.9 volts? If yes, go to next step. If no, see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS.
    2. 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.
  2. Turn the ignition off. Disconnect the Fuel Pump Module harness connector. Turn ignition on, with the engine off. Measure the voltage on the Fuel Level Sensor Signal circuit in the Fuel Pump Module harness connector. Is the voltage more than 5.3 volts? If yes, repair the short to battery voltage in the Fuel Level Sensor Signal circuit. If no, go to next step.
  3. Turn the ignition off. Connect a jumper wire between the Fuel Level Sensor Signal circuit and the Sensor Ground circuit in the Fuel Pump Module harness connector. Turn the ignition on, with the engine off. With the DRBIII(R), read the Fuel Level Sensor voltage. Did the Fuel Level Sensor voltage change from more than 4.8 volts to less than 0.4 volt? If yes, replace the Fuel Level Sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If no, go to next step.
    4. 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.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the Fuel Level Sensor Signal circuit from the Fuel Pump Module harness connector to the appropriate terminal in the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the Fuel Level Sensor Signal circuit.
    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.
  5. Measure the resistance of the Sensor Ground circuit from the Fuel Pump Module harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the Sensor Ground circuit.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  6. There are no possible causes remaining, replace the PCM.
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