P0462: Diagnosis and Testing

P0462 - Fuel Level Sensor 1 Circuit Low






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 1 input voltage is below the minimum 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: P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW?

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 - ATTEMPT TO SET THE OPPOSITE DTC

• Turn the ignition off.

• Disconnect 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 HIGH?

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 3

Test Step 3 - CHECK THE (N4) FUEL LEVEL SIGNAL CIRCUIT FOR A SHORT TO GROUND







• Turn the ignition off.

• Disconnect the Fuel Pump Module harness connector.

• Disconnect the TIPM C7 harness connector.

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

Is the resistance above 10k Ohms?

Yes

• Go to Test Step 4

No

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

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

Test Step 4 - CHECK THE (N4) FUEL LEVEL SIGNAL CIRCUIT FOR A SHORT TO THE (P37) SWITCH RETURN CIRCUIT







• Measure the resistance between the (P37) Switch Return circuit and the (N4) Fuel Level Signal circuit at the Fuel Pump Module harness connector.

Is the resistance above 10k Ohms?

Yes

• Go to Test Step 5

No

• Repair the short between the (P37) Switch Return circuit and the (N4) Fuel Level Signal circuit.

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

Test Step 5 - 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