P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW





For a complete wiring diagram Refer to Section 8W.



Possible Causes
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
FUEL LEVEL SENSOR
TIPM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



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


No

2. FUEL LEVEL SENSOR



Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Ignition on, engine not running.
Using a fused jumper wire, jump the (K900) Sensor Ground circuit to the (N4) Fuel Level Sensor No.1 Signal circuit in the Fuel Pump Motor harness connector.

Did the Fuel gauge level change from empty to full?

Yes


No

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



Turn the ignition off.
Disconnect the C7 TIPM harness connector.
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


No

4. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT



Measure the resistance between the (N4) Fuel Level Signal circuit and the (K900) Sensor Ground circuit from the Fuel Pump Module harness connector.

Is the resistance below 5.0 ohms?

Yes


No

5. TOTALLY INTEGRATED POWER MODULE

NOTE: Before continuing, check the TIPM 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 any problems found?

Yes


No