Aerostar AWD V6-183 3.0L (1991)
Canister Purge Solenoid: Description and Operation
Canister Purge Solenoid
Canister purging is regulated by a Purge Control Solenoid Valve, which is electronically controlled by the EEC-IV Module. The normally closed
solenoid valve is located within the vapor line between the charcoal canister and the throttle body vacuum fitting. The solenoid valve is designed to
block fuel vapors from entering the intake manifold, while the engine is not running, and allows precise control of canister purging.
In order to calculate the timing and duration that the canister is purged, the EEC-IV Module monitors engine speed, load, and temperature until
conditions are favorable. When the solenoid valve is opened, manifold vacuum is applied to the canister, and the fuel vapors are drawn into the
induction system to be consumed.
As the fuel vapors are being purged, fresh air is drawn into the charcoal canister from under the fresh air inlet cap, located on top of the canister.