P0462 LOW 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 falls below a calibrated value for a calibrated amount of time.

POSSIBLE CAUSES

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

DIAGNOSTIC PROCEDURE

1. Turn the ignition off. Disconnect the Fuel Level Sensor harness connector. Check connectors - Clean/repair as necessary. Measure the resistance of the sensor across the (G8) signal circuit and (K4) return 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. Disconnect the ECM harness connectors. Check connectors - Clean/repair as necessary. Measure the resistance of the (G8) signal circuit between the ECM harness connector and the sensor harness connector. Is the resistance less than 10 ohms?
   Yes --> Go To 3
   No --> Repair the open (G8) signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
3. Measure the voltage between the (G8) signal circuit and battery negative. Is the voltage greater than 1 volt?
   Yes --> Repair the (G8) signal circuit shorted to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 4
4. Reconnect the ECM harness connector. While monitoring with the DRBIII®, connect a jumper wire between the (G8) signal circuit in the sensor harness connector and battery negative. Did the DTC P0463 set?
   Yes --> Test Complete.
   No --> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).