Evaporative Emissions Control System: Notes

NOTE: For EVAP system component locations, see appropriate illustration in COMPONENT LOCATIONS .

NOTE: For vacuum hose and circuit identification, see VACUUM DIAGRAMS article.

Evaporative Emissions (EVAP) control system is used to reduce hydrocarbon (HC) emissions emitted into the atmosphere from the fuel system. Reduction of HC emissions is accomplished by activated charcoals in the EVAP canister. Fuel vapors from the fuel tank are stored in the EVAP canister when engine is not running and during refueling. Vapors are then purged into intake manifold while engine is running. EVAP canister purge volume is controlled by the ECM. EVAP canister purge is shut off during deceleration and idle periods.