K 1500 Yukon XL 4WD V8-5.3L VIN T (2001)
Canister Purge Control Valve: Description and Operation
EVAP PURGE VALVE
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
by the PCM in order to precisely control the flow of the fuel vapor to the engine. The valve will also be opened during some portions of the EVAP
testing, allowing the engine vacuum to enter the EVAP system.
