The Chrysler 200 Canister Purge Valve ensures fuel vapors do not leak from the gas tank, routing them to the engine to burn instead of polluting. The Canister Purge Valve mounts between the charcoal canister and the intake manifold. It opens when engine vacuum and a signal from the computer occur, allowing air to draw the stored hydrocarbons through the activated charcoal and into the combustion chambers. A second style of Canister Purge Valve was introduced on OBD II models, which is still vacuum actuated but is now monitored by an electronic vent solenoid and a fuel tank pressure sensor that allows the computer to seal the system and verify leak tightness during self tests. Prior designs incorporated a basic Canister Purge Valve operating predominantly on vacuum and temperature without integrated diagnostics. Hence, it was unable to activate the dash warning light when jammed. The valve on the mid-size Chrysler 200 sold after 2011 gets a constant twelve-volt feed while the powertrain module pulses ground to control flow. The later Chrysler 200 line has the same compact 200 device, and knowing its function can help Chrysler owners act quickly if the final Canister Purge Valve sticks or leaks, raising emissions and turning on the dash lamp.
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