The Honda Odyssey Canister Purge Valve serves an important function in preventing fuel vapors from entering the atmosphere by piping the vapors from the charcoal canister to the intake where they burn with the normal air-fuel mixture. Acting like a traffic light for hydrocarbons, this small, electrically controlled Canister Purge Valve opens when the engine computer senses the right temperature, speed, and load, allowing the manifold vacuum to draw fresh air through activated charcoal so stored fumes flow into the cylinders and combust cleanly. Early versions of pre-OBD-II Odyssey models employed a simple vacuum-operated design, and later versions of the Honda Odyssey come with a solenoid-driven Canister Purge Valve that operates in conjunction with a vent solenoid and a tank pressure sensor, enabling the ECM to produce a sealed system, pull test vacuum, and flag for leaks if pressure has not dropped. Despite these tweaks over the generations, the basic goal is the same for all Honda Odysseys, to trap vapors first and purge them only when the engine can burn them, greatly reducing smog-forming hydrocarbons and stopping raw fuel odors. There is no alternative style other than the original vacuum type and the current electronically commanded Canister Purge Valve, and the primary difference is the diagnostic capability of the newer design to help a Honda driver detect a loose fuel cap or a sticking Canister Purge Valve before emissions climb.
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