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
-
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). -
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). -
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 -
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).
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