K 2500 Truck 4WD V8-6.0L VIN U (1999)
Canister Purge Solenoid: Description and Operation
EVAP Purge Solenoid
The EVAP purge solenoid valve is mounted on the top of the intake manifold. The EVAP purge solenoid valve isolator (2) and mounting fastener (3)
must never be substituted. The EVAP purge solenoid valve allows manifold vacuum to purge the canister through the vacuum port (4). The Powertrain
Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). The EVAP purge solenoid control is Pulse Width
Modulated (PWM) or turned on and off several times a second.
