P0463

DTC P0463 Fuel Level Sensor Circuit High Voltage




Circuit Description
The PCM uses the fuel level input in order to calculate the expected vapor pressures within the fuel system. These vapor pressures vary as the fuel level changes. The vapor pressure is critical in determining if the Evaporative Emissions System is operating properly. The PCM also uses the fuel level in order to determine if the fuel level is too high or too low to be able to accurately detect EVAP system malfunction.

Conditions for Setting the DTC
The fuel level sensor is more than 98% for 25 seconds or more.

Action Taken When the DTC Sets
- The PCM records the operating conditions at the time the diagnostic fails. The Failure Records buffers will store this information.
- A history DTC is stored.
- The fuel tank level defaults to 40 percent.

Conditions for Clearing the DTC
- A history DTC clears after 40 consecutive warm up cycles without a fault.
- The scan tool can clear the DTC.

Diagnostic Aids
- An intermittent problem may be caused by the following conditions:
- Poor electrical connection
- Rubbed through wire insulation
- A wire that is broken inside the wire insulation
- Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wire connection

Steps 1 - 2:

Steps 3 - 5:

Steps 6 - 10:

Steps 11 - 16:

Steps 17 - 18:

Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
2. This step determines if the malfunction is present.
3. Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.) that you observed. This will isolate when the DTC failed.
4. Use the connector test adapter kit to avoid damage to the harness connector terminals.
10. The replacement PCM must be programmed and the Crankshaft Position System Variation Learn Procedure must be performed. Refer to the latest Techline information for PCM programming.