K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Canister Purge Control Valve: Description and Operation
EVAP PURGE VALVE
The EVAP purge valve controls the flow of vapors from the EVAP system to the intake manifold. This normally closed valve is Pulse Width Modulated
(PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP
testing, allowing engine vacuum to enter the EVAP system.
