EVAP Canister Purge Solenoid
WARNING: This page is about a different car, the 2003 Dodge Intrepid, 2003 Chrysler Intrepid, 2003 Chrysler Concorde, and 2003 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
All vehicles use a proportional purge solenoid. See Figure . The solenoid regulates the rate of vapor flow from the EVAP canister to the throttle body. The Powertrain Control Module (PCM) controls the solenoid. During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The purge solenoid operates at a frequency of 200 Hz and is controlled by an engine controller circuit that senses the current being applied to the purge solenoid and then adjusts that current to achieve the desired purge flow. The purge solenoid controls the purge rate of fuel vapors from the vapor canister and fuel tank to the engine intake manifold.