FixVault
Home › Jeep › 2003 › Grand Cherokee Overland › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0463: Fuel Level Sending Unit Volts Too High › Testing

DTC P0463: Fuel Level Sending Unit Volts Too High: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read the fuel level sensor voltage. Is the fuel level sensor voltage above 4.9 volts? If yes, go to next step. If no, go to INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the Fuel Pump Module electrical harness connector. Fuel pump module is mounted in top of fuel tank. Connect a jumper wire between the (K226) Fuel Level Sensor Signal circuit and the (K4) Sensor ground circuit at the Fuel Pump Module harness connector. Turn 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 volt? If yes, replace the Fuel Level Sensor. If no, go to next step.
    NOTE: Remove the jumper wire before continuing.
  3. Turn the ignition off. Disconnect PCM harness connectors. Turn the ignition on, engine not running. Measure the voltage of the Fuel Level Sensor Signal circuit at the Fuel Pump Module harness connector. Is the voltage above 10.0 volts? If yes, repair the fuel level sensor signal circuit short to voltage. If no, go to next step.
    4. NOTE: Check connectors. It is critical that the connector is free from any signs of corrosion or deformities. Clean and repair as necessary.
  4. Measure the resistance of the (K226) Fuel Level Sensor Signal circuit from the PCM harness connector to the Fuel Pump Module harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K226) Fuel Level Sensor Signal circuit for an open.
  5. Measure the resistance of the (K4) Sensor ground circuit from the PCM harness connector to the Fuel Pump Module harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K4) Sensor ground circuit for an open.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
About FixVault