Canister Purge Valves, Canister Purge Solenoids
The canister purge valve is a part of the exhaust system. It is a valve that opens and allows fumes stored in the charcoal canister back into the engine combustion process. The fumes are recycled or sent out through the exhaust. The valve is controlled by a solenoid. A solenoid is an electromechanical device that opens and closes the valve through the use of magnets. The purge valve is open when the engine is running and closed when the vehicle is off. An additional valve, the bowl vent valve, is open when the engine is off and allows left over fumes to be stored in the charcoal canister. The process is repeated when the engine is engaged, the valves switch positions and fumes from the charcoal canister are recycled through the purge valve. The valve is controlled by the power train control module, one of the computer components of the vehicle.