P0462

P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW





For a complete wiring diagram Refer to the Wiring Information.

- When Monitored:
Ignition on and battery voltage above 10.4 volts.

- Set Condition:
The fuel level sensor signal voltage goes below the minimum acceptable value. One Trip Fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. ACTIVE DTC

NOTE: Diagnose any CAN - C or CAN - B Communication DTCs before continuing.

1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With a scan tool, select View DTCs and record the related Freeze Frame data.

NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

2. FUEL LEVEL SENSOR




1. Turn the ignition off.
2. Disconnect the Fuel Pump Module harness connector.
3. Ignition on, engine not running.
4. Using a fused jumper wire, jump the (K91) 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

- Verify that there is good pin to terminal contact at the Fuel Pump Module, and the Totally Integrated Power Module connectors. If OK, replace the Fuel Level Sensor/Fuel Pump Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Go To 3

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




1. Turn the ignition off.
2. Disconnect the C7 TIPM harness connector.
3. 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 the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Go To 4

4. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K91) SENSOR GROUND CIRCUIT




1. Measure the resistance between the (N4) Fuel Level Signal circuit and the (K91) Sensor Ground circuit from the Fuel Pump Module harness connector.

Is the resistance below 5.0 ohms?

Yes

- Repair the short between the (K91) Sensor Ground circuit and the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Go To 5

5. EXCESSIVE RESISTANCE IN THE (N4) FUEL LEVEL SIGNAL CIRCUIT




1. Turn the ignition off.
2. Measure the resistance of the (N4) Fuel Level Signal circuit from the Fuel Pump Module harness connector to the C7 TIPM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 6

No

- Repair the excessive resistance in the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

6. TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pump Module and the Totally Integrated Power Module (TIPM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Fuel Pump Module and the TIPM connectors.
4. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Replace the Totally Integrated Power Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.