EVAP Vent Solenoid
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The EVAP vent solenoid controls fresh airflow into the EVAP canister. The solenoid is normally open. The control module commands the solenoid ON, closing the solenoid during some EVAP tests, allowing the system to be tested for leaks.