Leak Detection Solenoid: Description and Operation
CANISTER VENT (CV) SOLENOIDTypical Canister Vent (CV) Solenoid:
During the evaporative emissions (EVAP) leak check monitor, the CV solenoid seals the EVAP canister from the atmospheric pressure. This allows the EVAP canister purge valve to obtain the target vacuum in the fuel tank during the EVAP leak check monitor.