Canister Purge Control Valve: Description and Operation

Evaporative Canister Vent Valve:

DESCRIPTION
The Evaporative Canister Vent Valve replaces the fresh air vent used on past EVAP canisters.

OPERATION
The vent valve now not only allows the fresh outside air to the EVAP canister during the purge modes, but also allows the diagnostic to pull a vacuum on the fuel tank by closing the vent valve. This valve is normally open.