DTC P0447-00: Evaporative Emission System-Vent Control Circuit Open: General Description

The PHEV fuel vapor recovery system includes a Fuel Tank Isolation Valve (FTIV), which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum the PHEV fuel vapor recovery system.