P0462

P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW






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 4.4 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 the (K310) sensor ground circuit
- Fuel level sensor
- CAN C BUS circuit open or shorted
- BCM
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

DIAGNOSTIC TEST

1. FUEL LEVEL SENSOR VOLTAGE BELOW 0.4 OF A VOLT

NOTE: Diagnose all CAN C communication DTCs before continuing.

Ignition on, engine not running.
With the scan tool, read the Fuel Level Sensor voltage.

Q: Is the Fuel Level Sensor voltage below 0.4 of a volt?

YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Component Tests and General Diagnostics
Perform the POWERTRAIN VERIFICATION TEST. Powertrain 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.

Q: 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 the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 3

3. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND




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

Q: Is the resistance below 100 ohms?

YES: Repair the short to ground in the (N4) Fuel Level Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 4

4. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K310) SENSOR GROUND CIRCUIT




Measure the resistance between the (N4) Fuel Level Signal circuit and the (K310) Sensor ground circuit in the Fuel Pump Module harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Repair the short between the (K310) Sensor ground circuit and the (N4) Fuel Level Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 5

5. BCM

NOTE: Before continuing, check the BCM 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.

Q: Were there any problems found?

YES: Repair as necessary.
Perform the BODY VERIFICATION TEST. Body Verification Test
NO: Replace and program the Body Control Module.
Perform the BODY VERIFICATION TEST. Body Verification Test