Evaporative Emission System: Notes
Hydrocarbon (HC) generated in the fuel tank are absorbed by the active carbon in the evaporative emission canister and stored. HC stored in the evaporative emission canister is introduced to the intake manifold when engine is in operation where it is mixed with intake air and combusted. ECM introduces optimum HC amount according to driving conditions and so performs duty control on the evaporative emission purge solenoid. Also, the evaporative emission purge solenoid is closed during deceleration or immediately after engine start to restrict change in air-fuel ratio and prevent engine from stalling.