SOLENOID, Evaporative Emissions Purge: Operation: Operation

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.

All vehicles use a linear purge valve. The linear purge valve is a solenoid that regulates the rate of vapor flow from the evaporative emission (EVAP) canister to the intake manifold. The powertrain control module (PCM) operates the linear purge valve.

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 linear purge valve operates at a frequency of 200 hz and is controlled by an engine controller circuit that senses the current being applied to the linear purge valve and then adjusts that current to achieve the desired purge flow. The linear purge valve controls the purge rate of fuel vapors from the vapor canister and fuel tank to the engine intake manifold.