P0463

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Fuel Level sensor is an important input to the 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 the air pressure in the EVAP system. Several of the Enhanced Evaporative System Diagnostic sub-test are dependent upon the 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%).

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 2.9 volts for a period greater than 20 seconds

ACTION TAKEN WHEN THE DTC SETS

The VCM will not turn ON the MIL.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The VCM turns the MIL OFF after 3 consecutive drive trips when the' test has Run and Passed and not Failed.

^ A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle).

^ Use the scan tool Clear Information function.

^ Disconnect the VCM battery feed for 30 seconds.

DIAGNOSTIC AIDS

Check for the following conditions:

^ A poor connection or damaged harness - Inspect VCM harness connectors for the following:

- Backed out terminals

- Improper mating

- Broken locks

- Poor wire to terminal connections

^ Intermittent test - monitor a scan tool or digital voltmeter connected between the related circuits while moving the connectors and harnesses. If the failure is induced, the voltage reading will change. This will help locate a circuit problem.

TEST DESCRIPTION

The numbers below refer to the step numbers in the diagnostic table.

4. This step checks the signal circuit and the VCM.