P0462
P0462-LOW VOLTAGE DETECTED AT THE FUEL LEVEL SENSORP0462 - Low Voltage Detected At The Fuel Level Sensor:
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
- (N4) Signal circuit open
- (N4) Signal circuit shorted to voltage
- Intermittent condition
- ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. FUEL LEVEL SENSOR
Turn the ignition off.
Disconnect the Fuel Level Sensor harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the sensor across the (N4) signal circuit and (K900) return circuit.
Q: Is the resistance less than 10 ohms?
YES: Go To 2
NO: Replace the fuel level sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
2. (G8) SIGNAL CIRCUIT OPEN
Disconnect the ECM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the (N4) signal circuit between the ECM harness connector and the sensor harness connector.
Q: Is the resistance less than 10 ohms?
YES: Go To 3
NO: Repair the open (N4) signal circuit. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
3. (G8) SIGNAL CIRCUIT SHORTED TO VOLTAGE
Measure the voltage between the (N4) signal circuit and battery negative.
Q: Is the voltage greater than 1 volt?
YES: Repair the (N4) signal circuit shorted to voltage. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 4
4. ECM
Reconnect the ECM harness connector.
While monitoring with the scan tool, connect a jumper wire between the (N4) signal circuit in the sensor harness connector and battery negative.
Q: Did the DTC P0463 set?
YES: Test Complete.
NO: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1