P0463

P0463-HIGH 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 goes above a calibrated value for a calibrated amount of time.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test


1. FUEL LEVEL SENSOR

Disconnect the ECM harness connectors.

Disconnect the Fuel level sensor harness connector.


NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Fuel level 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 SHORTED TO GROUND





Measure the resistance between the (N4) signal circuit in the sensor harness connector and battery negative.

Is the resistance less than 10 Ohms?

Yes

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

No

- Go To 3

3. ECM

Reconnect the ECM harness connector.

While monitoring with the scan tool, disconnect the Fuel level sensor harness connector.

Did the DTC P0462 set?

Yes

- Test Complete.

No

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