The canister vent solenoid:

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Is normally open.
Seals the EVAP system for the inspection and maintenance (I/M 240) test and OBD II leak and pressure tests.
Is mounted to the evaporative emission canister.
Is repaired as a separate item.