Evaporative Emission Control System (EECS)

This is canister purge control. The ECM controls vacuum to purge valve in charcoal canister through a solenoid valve. When engine is operating in open loop mode, solenoid valve is energized and blocks vacuum to purge valve. When engine is operating in closed loop mode above prescribed RPM, solenoid valve is de-energized and vacuum is applied to purge valve. This draws collected vapors into intake manifold.