P0463

DTC P0463 Fuel Level Sensor Circuit High Input




Circuit Description
The Fuel Level sensor is an important input to the PCM for the Enhanced Evaporative System Diagnostic. The PCM needs the fuel level information in order to know the volume of fuel in the tank. The fuel level affects the rate of change in air pressure in the EVAP system. Several of the Enhanced Evaporative System Diagnostic sub-tests are dependent upon correct fuel level information. The diagnostic will not run when the tank is greater than 85% or less than 15% full. (This sensor signal disables the misfire when the fuel levels are less than 15%). If the PCM detects a continuous short to voltage in the Fuel Level sensor or circuit, then a DTC P0463 will set.
DTC P0463 is a type D code.

Conditions for Setting the DTC
- The Fuel Tank Level Slosh Test is completed.
- The Fuel Tank Level Main Test is completed.
- The Fuel Tank Level Data is valid.
- The Fuel Level signal voltage is greater than 4.9 volts for a period greater than 20 seconds.

Action Taken When the DTC Sets
- The PCM will not turn on the MIL.

Conditions for Clearing the DTC
- The PCM turns the MIL oft after 3 consecutive driving trips without a fault condition present.
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 40 °F from the start-up coolant temperature and the engine coolant temperature exceeds 160 °F during that same ignition cycle) or the Scan Tool clearing feature has been used.

Steps 1 - 7:

Steps 8 - 11:

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Chart:
5. This step checks the wiring, connections, and the PCM.
7. This step checks the wiring, connections, and the PCM.