Canister Purge Control Valve: Description and Operation

Tank venting valve is a solenoid valve applied in line to correctly meter additional fuel vapor drawn from carbon canister after vaporization. It is operated by DME control unit and receives a signal which is dependent on intake air flow rate and similar to fuel injector signal. When intake air flow rate is low, valve receives a short time signal. When flow rate is high, valve receives a longer time signal. This allows correct flushing air volume to be mixed in correct ratio to intake air volume.