Note. For circuit reference, see WIRING DIAGRAMS article.
Circuit Description
The PCM uses fuel level input in order to calculate expected vapor pressures within the fuel system. The vapor pressures will vary as fuel level changes. Vapor pressure is critical in determining if EVAP system is operating properly. PCM also uses fuel level information to determine if the fuel level is too high or too low to accurately detect an EVAP system malfunction.
Fuel level sensor value should be less than 3.5 percent for more than 25 seconds to set DTC.