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Canister Purge Control Valve: Description and Operation
EVAP Vacuum Switch:
DESCRIPTION The Evaporative Emissions
(EVAP) Canister Purge Vacuum Switch is a normally open switch which closes when vacuum is applied. It is an input to the
PCM to signal that the EVAP solenoid has opened, allowing manifold vacuum to draw fuel vapors from the charcoal canister into the intake manifold.