The function of the Toyota Avalon Canister Purge Valve is to route the fuel vapors that are stored in the charcoal canister into the engine so they are burned rather than expelled into the atmosphere. The device known as the Canister Purge Valve is a solenoid valve mounted between the canister and the intake manifold. The valve opens when the engine computer determines that the operating conditions are suitable, speed and temperature. The opening of the valve allows manifold vacuum to pull fresh air through activated charcoal granules. The fresh air sweeps the hydrocarbon vapor within the canister into the engine for combustion. The early Avalon models applied a vacuum-actuated Canister Purge Valve. Later OBD-II Toyota models switched to an electronically controlled solenoid style. This is a different type that works with a tank pressure sensor and vent valve to let the ECM run leak tests. The revised configuration has a faster response time, provides onboard diagnostics, and activates the check engine light if the vacuum does not reach the target levels. This generally occurs due to either a loose cap or a sticking Canister Purge Valve. No matter the generation, the Canister Purge Valve keeps smog-forming vapors contained. This allows every Toyota Avalon to meet emissions regulations while ensuring smooth, efficient driving.
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