P0462

P0462-LOW VOLTAGE DETECTED AT THE FUEL LEVEL SENSOR





For complete wiring diagrams refer to Diagrams/Electrical.


- 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.







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.

Is the resistance less than 10 ohms?

Yes

- Go To 2

No

- Replace the fuel level sensor.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. (N4) 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.

Is the resistance less than 10 ohms?

Yes

- Go To 3

No

- Repair the open (N4) signal circuit.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

3. (N4) SIGNAL CIRCUIT SHORTED TO VOLTAGE





Measure the voltage between the (N4) signal circuit and battery negative.

Is the voltage greater than 1 volt?

Yes

- Repair the (N4) signal circuit shorted to voltage.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

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.

Did the DTC P0463 set?

Yes

- Test Complete.

No

- Replace the ECM.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test