EVAP Vent Solenoid
WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
The EVAP vent solenoid controls fresh air flow into the EVAP canister. EVAP vent solenoid is mounted on frame rail, near fuel tank. See Fig 1 . The solenoid is normally open. The control module will command the solenoid closed during some EVAP tests, allowing the system to be tested for leaks.