P0463

DTC P0463 Fuel Level Sensor Circuit High Voltage:

Fuel Level Sensor Circuit:

Circuit Description
The Fuel Level sensor is an important input to the Vehicle Control Module (VCM) for the Enhanced Evaporative System Diagnostic. The VCM 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 Evaporation Emission (EVAP) system. Several of the Enhanced Evaporative System Diagnostic sub-test 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%). This DTC is a type D DTC.

Conditions For Setting The DTC
The Following Conditions will set the DTC:

^ The Fuel Tank Level Slosh Test is completed.
^ The Fuel Tank Level Main Test is completed.
^ The Fuel Tank Level Data Valid.
^ The Fuel Level signal voltage is greater than 4.6 volts for 20 seconds.

Action Taken When The DTC Sets
The VCM will not turn on the Malfunction Indicator Lamp (MIL).

Conditions For Clearing The MIL/DTC
The VCM turns the MIL off 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.

Test Description
Number(s) below refer to step number(s) on the Diagnostic Tables

2. This step determines if the problem is a VCM problem or a vehicle wiring problem.