Silverado 3500 2WD V8-6.0L VIN U (2004)
Canister Purge Solenoid: Description and Operation
EVAP PURGE SOLENOID VALVE
The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when
commanded ON by the control module. 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.
