Evaporative Emissions Control System - Engine Running
When the engine is running, a vacuum is applied to the purge hose (4) from the inlet manifold.
At certain times, the ECM opens the purge valve. The vacuum applied to the purge hose (4) now begins to draw stored vapour from the carbon filled area of the canister and returns it to the inlet manifold for burning in the engine.
In order to control the speed at which the vapour is purged from the canister, the engine management system shuttles the purge control valve between the open and closed positions.
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