P0463: Diagnosis and Testing

P0463 - Fuel Level Sensor 1 Circuit High






For a complete wiring diagram, refer to.

• When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

• Set Condition: The Fuel Level Sensor input voltage is above the maximum acceptable value.






Test Step 1 - CHECK FOR AN INTERMITTENT CONDITION

• Turn the ignition on.

• With the scan tool, clear all DTCs.

• With the scan tool, read DTCs.

Does the scan tool display DTC: P0463-FUEL LEVEL SENSOR 1 CIRCUIT HIGH?

Yes

• Go to Test Step 2

No

• Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 2 - CHECK THE (N4) FUEL LEVEL SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE







• Turn the ignition off.

• Disconnect the Fuel Pump Module harness connector.

• Disconnect the TIPM C7 harness connector.

• Turn the ignition on.

• Measure the voltage between ground and the (N4) Fuel Level Signal circuit at the Fuel Pump Module harness connector.

Is there any voltage present?

Yes

• Repair the short to voltage in the (N4) Fuel Level Signal circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Go to Test Step 3

Test Step 3 - CHECK THE FUEL LEVEL SENSOR FOR CORRECT OPERATION







• Turn the ignition off.

• Connect the TIPM C7 harness connector.

• Connect a jumper wire between the (N4) Fuel Level Signal circuit and the (P37) Switch Return circuit at the Fuel Pump Module harness connector.

• Turn the ignition on.

• With the scan tool, read DTCs.

Does the scan tool display DTC: P0463-FUEL LEVEL SENSOR 1 CIRCUIT LOW?

Yes

• Replace the Fuel Level Sending Unit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Go to Test Step 4

Test Step 4 - CHECK THE (N4) FUEL LEVEL SIGNAL 1 CIRCUIT FOR AN OPEN







• Turn the ignition off.

• Disconnect the TIPM C7 harness connector.

• Measure the resistance of the (N4) Fuel Level Signal circuit between the Fuel Pump Module harness connector and the TIPM C7 harness connector.

Is the resistance below 5.0 Ohms?

Yes

• Go to Test Step 5

No

• Repair the open in the (N4) Fuel Level Signal circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 5 - CHECK THE (P37) SWITCH RETURN CIRCUIT FOR AN OPEN







• Measure the resistance of the (P37) Switch Return circuit between the Fuel Pump Module harness connector and the TIPM C7 harness connector.

Is the resistance below 5.0 Ohms?

Yes

• Go to Test Step 6

No

• Repair the open in the (P37) Switch Return circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 6 - TOTALLY INTEGRATED POWER MODULE (TIPM)

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pump Module and the TIPM.

• Look for any chafed, pierced, pinched, or partially broken wires.

• 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 C7 harness connectors.

• Perform any Technical Service Bulletins (TSB)s that may apply.

Were any problems found?

Yes

• Repair as necessary.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Replace the TIPM.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior