P0463 HIGH VOLTAGE DETECTED AT THE FUEL LEVEL SENSOR

When Monitored and Set Condition:

When Monitored: Ignition on and battery voltage above 10.4 volts.
Set Condition: The signal voltage from the sensor goes above a calibrated value for a calibrated amount of time.

POSSIBLE CAUSES

• FUEL LEVEL SENSOR
• (G8) SIGNAL CIRCUIT SHORTED TO GROUND
• INTERMITTENT CONDITION
• ECM

DIAGNOSTIC PROCEDURE

1. Disconnect the ECM harness connectors. Disconnect the Fuel level sensor harness connector. Check connectors - Clean/repair as necessary. Measure the resistance of the Fuel level sensor across the (G8) signal circuit and return (K4) circuit. Is the resistance less than 10 ohms?
   Yes --> Go To 2
   No --> Replace the Fuel level sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
2. Measure the resistance between the (G8) signal circuit in the sensor harness connector and battery negative. Is the resistance less than 10 Ohms?
   Yes --> Repair the (G8) signal circuit shorted to ground. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 3
3. Reconnect the ECM harness connector. While monitoring with the DRBIII®, disconnect the Fuel level sensor harness connector. Did the DTC P0462 set?
   Yes --> Test Complete.
   No --> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).