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EVAP canister purge valve (321)

EVAP canister purge valve (321)


The EVAP canister purge valve comprises a solenoid valve located in the line between the EVAP emission canister and the intake manifold. It is used to govern the amount of air/hydrocarbons from the emission canister that is passed to the engine for combustion. The purge valve is also used during the tank integrity diagnosis.

The purge valve is normally closed. It is supplied with current from the main relay and is controlled with a 16Hz PWM from control module pin 27. During the tank integrity diagnosis, the frequency is 8Hz.