Circuit Description

Fuel level is an important input to PCM for Enhanced Evaporative System Diagnosis (EESD). PCM needs fuel level information to know the volume of fuel in tank. Fuel level input is required to gauge rate of change in air pressure in EVAP system. Several EDSD sub-test are dependent upon correct fuel level information. EESD test will not be performed when fuel level is 85 percent or more or less than 15 percent (full tank).

When DTC sets, PCM illuminates MIL as soon as fault was detected. PCM will store conditions present when DTC was set as FREEZE FRAME data in the FAILURE RECORDS data. A history DTC is set.

PCM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC will clear after 40 consecutive ignition cycle which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.