P0462

P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW






For a complete wiring diagram refer to: Electrical Diagrams

When Monitored
Ignition on and battery voltage above 10.4 volts.

Set Condition
The fuel level sensor signal voltage goes below 0.4 of a volt for more than 90 seconds. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes
- (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND]
- (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO (Z210)
- FUEL LEVEL SENSOR RETURN CIRCUIT
- FUEL LEVEL SENSOR
- INSTRUMENT CLUSTER

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. FUEL LEVEL SENSOR VOLTAGE BELOW 0.4 OF A VOLT





NOTE: Diagnose any CAN - B or CAN -C Communication DTCs before continuing.
Ignition on, engine not running.
With the scan tool, read the Fuel Level Sensor voltage.

Is the Fuel Level Sensor voltage below 0.4 of a volt?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
2. FUEL LEVEL SENSOR
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Ignition on, engine not running.
With the scan tool, read the Fuel Level Sensor voltage.

Did the Fuel Level Sensor voltage change from below 0.4 of a volt to above 4.0 volts?
Yes >> Replace the Fuel Level Sensor.
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
No >> Go To 3
3. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND





Turn the ignition off.
Disconnect the C2 Cluster harness connectors.
Measure the resistance between ground and the (N4) Fuel Level Signal circuit in the Fuel Pump Module harness connector.

Is the resistance below 100 ohms?
Yes >> Repair the short to ground in the (N4) Fuel Level Signal circuit.
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
No >> Go To 4
4. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (Z210) FUEL LEVEL SENSOR GROUND CIRCUIT





Measure the resistance between the (N4) Fuel Level Signal circuit and the (Z210) Fuel Level Sensor Ground circuit in the Fuel Pump Module harness connector.

Is the resistance below 5.0 ohms?
Yes >> Repair the short between the (Z210) Fuel Level Sensor Ground circuit and the (N4) Fuel Level Signal circuit.
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
No >> Go To 5
5. INSTRUMENT CLUSTER

NOTE: Before continuing, check the Instrument Cluster harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?
Yes >> Repair as necessary
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
No >> Replace and program the Instrument Cluster per Service Information.
Perform BODY VERIFICATION TEST-VER 1.