P0464

DTC P0464: Fuel Level Sensor Circuit Intermittent

Wiring Diagram:

Circuit Description
The Engine Control Module (ECM) uses the fuel level input from the Fuel Level Sensor to calculate expected vapor pressures within the fuel system. Vapor pressures vary as the fuel level changes. Vapor pressure is critical in determining if the Evaporative emission (EVAP) system is operating properly. Fuel level is also used to determine if the fuel level is too high or too low to be able to accurately detect EVAP emission system faults. This Diagnostic Trouble Code (DTC) detects a faulty fuel level sensor which send out "noisy" signal.

Conditions for Setting the DTC
- Fuel level sensor output change is greater than 3.9%.
- No relevant DTCs are set.
- Intake Air Temperature (IAT) is greater than -10 °C (14 °F).
- The change in Manifold Absolute Pressure (MAP) is less than 10 kPa.
- The change in RPM is less than 50 rpm.
- Vehicle Speed Sensor (VSS) is greater than 0.6 mph (1 km/h).
- Throttle position is less than 2%.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history Diagnostic Trouble Code (DTC) is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF after four consecutive validation cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.

Diagnostic Aids
If DTC P0463 is also displayed, go to DTC P0463 first.
Inspect harness connector for backed-out terminal, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connection.
Inspect wiring harness for damage.A stuck fuel level sensor may cause the DTC set. If the DTC P0462 cannot be duplicate, the information included on the Failure record data can be useful in determine vehicle conditions when the DTC was first set.
Resistance checks for fuel level sensor:
- Empty = 280ohms or over
- Half Full = about 90 ohms
- Full = 38 ohms or less

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. The On-Board Diagnostic (OBD II) System Check prompts the technician to complete some basic checks and store the Freeze Frame and Failure Records data on the scan tool if applicable.
This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on scan tool for later reference.
2. Determine if fault is present. Review Freeze Frame data to determine when the DTC set.
Always record this information.

Step 1-6:

Step 7-12:

Troubleshooting