P0441 Scion xB I

DTC P0441 is set if either one of the following conditions applies

1. VSV for EVAP stuck closed malfunction: The ECM checks for the malfunction by signaling the VSV for EVAP to open with the VSV for CCV (vent) closed. If a highly negative pressure does not develop in the fuel tank, the ECM determines that the VSV for EVAP remains closed and illuminates the MIL and sets the DTC.
2. VSV for EVAP stuck open malfunction: The ECM checks for the malfunction by signaling both the VSV for EVAP and VSV for CCV to close at a time when the internal fuel tank pressure level is equal to the atmospheric pressure. If a highly negative pressure develops in the fuel tank at this early stage of the check, the ECM determines that the VSV for EVAP is stuck open, and illuminates the MIL and sets the DTC.