The purpose of the Toyota Camry Canister Purge Valve is to prevent gasoline vapor from escaping into the air by channeling it to the engine for clean burning. The Canister Purge Valve sits between the intake manifold and the charcoal canister. Under conditions of engine vacuum, the valve opens, allowing air to sweep through the activated charcoal. This allows stored hydrocarbons to join the air fuel charge, resulting in complete combustion rather than escaping as a pollutant. The late-seventies Camry had an entirely vacuum-operated system. Nowadays, Toyota electronics on OBD-II cars pulse the Canister Purge Valve under computer control, close the vent solenoid, and monitor the tank pressure sensor to ensure the system is staying sealed. This upgrade not only more accurately cuts unwanted gases that cause smog, it will also light the warning lamp if leaks or a sticking Canister Purge Valve increase emissions. Placement may vary, but underneath the hood or near the tank, every Toyota Camry relies on the same basic principle: a charcoal canister stores vapors and timed vapor draw brings it in. The Canister Purge Valve is key to that operation.
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