Patent ID: 7431022

Claim:
An evaporative emission canister purge actuation monitoring system for a motor vehicle having a vapor canister, an engine, and at least one control unit said system comprising: an integrated valve body and a cover mounted to said valve body so as to define a vent chamber between the cover and the valve body, said cover having a fresh air port providing fluid communication between ambient air and said vent chamber; said integrated valve body having a main flow passage and a canister port adapted to establish fluid communication between the vapor canister and said main flow passage; a first one-way umbrella valve mounted to said integrated valve body and responsive to a predetermined positive pressure in said main flow passage to control the flow of fluid from the vapor canister to the ambient air through said vent chamber and said fresh air port; a second one-way umbrella valve mounted to said integrated valve body and responsive to a predetermined negative pressure in said main flow passage to control the flow of ambient air through said fresh air port and said vent chamber and through said main flow passage and said canister port; and a vacuum actuated switch supported by said integrated valve body and in electrical communication with the control unit, said switch including a diaphragm operatively supported by a retainer with said retainer mounted to said integrated valve body, a flexible switch element and a pair of terminals supported by said integrated valve body, said switch element responsive to movement of said diaphragm to connect said pair of terminals in response to a predetermined negative pressure in said main flow passage to send a signal indicative of the predetermined negative pressure to the control unit.