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the purge valve controls the return of vapour which has been stored in the carbon canister during the period when the engine is switched off. the valve is 'pulsed' by the ecm to give control over the rate at which the canister is purged.
la válvula de purga controla el retorno de vapor que ha sido almacenado en el cartucho de carbono durante el periodo de apagado del motor. el ecm da pulso a la válvula para tener control de la frecuencia de purga del cartucho.