Evaporative Emissions System: Description and Operation

The evaporative emission system consists of the vapor separator, the two way check valve, the evaporative emission canister, the purge solenoid valve, the engine control module (ECM), and the input devices. The amount of evaporative vapors introduced into the engine and burned is controlled by the purge solenoid valve to correspond to the engine's operating conditions. To maintain the best engine performance, the purge solenoid valve is controlled by the ECM.