The EVAP purge solenoid controls the flow of
vapors from the EVAP system to the intake
manifold. This normally closed solenoid is pulse
width modulated (PWM) by the control module to
precisely control the flow of fuel vapor to the
engine. The solenoid will also be opened during
some portions of the EVAP testing, allowing
engine vacuum to enter the EVAP system.
Engine Emission Purge Valve Description

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