The Jeep Compass Canister Purge Valve channels stored fuel vapors towards the engine where they are burned instead of released into the atmosphere. The valve, situated between the charcoal canister and intake manifold, opens as manifold vacuum rises and draws fresh air through adsorbing charcoal which carries hydrocarbons into the cylinders for combustion. Every Jeep Compass since the 1970s depends on its Canister Purge Valve to regulate vapors. The initial Jeep Compass model was equipped with a vacuum-operated Canister Purge Valve that opened once the engine warmed. On the contrary, later Jeep Compass models come with an electronically actuated Canister Purge Valve that is activated by the engine control module. It can seal the system during self tests. It can also report leaks via trouble codes. While both types share the same aim of cutting smog forming hydrocarbons, the newer unit pairs with a vent solenoid and pressure sensor that gives on board diagnostics and tighter vapor control. A malfunctioning Canister Purge Valve can trip your check engine light, raise emissions, and create rough starts, but knowing its purpose will help owners understand this important component.
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