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Evaporative Control System - Engine Running
When the engine is started, a vacuum is applied to the purge hose from the throttle
bodies.
At certain times, the engine ECM opens the purge valve. The vacuum applied to the
purge valve now begins to draw stored vapour from the carbon filled evaporative
canister to the throttle bodies for burning in the engine.
In order to control the speed at which vapour is purged from the canister, the engine
management system regularly shuttles the purge control valve between open and closed
positions.
1. Throttle bodies
2. Evaporative canister
3. Purge valve
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