TrailBlazer 2WD L6-4.2L VIN S (2003)
Canister Purge Solenoid: Description and Operation
EVAP PURGE SOLENOID
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.
