Toyota 77740-08020 Canister Assy, Charcoal

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The function of the evaporative emissions control system is to draw fuel vapors from the fuel tank and fuel system, store them in a charcoal canister and then burn them during normal engine operation. On 1998 to 2000 models, the canister is up front, under the air filter housing. On later models, it is at the rear of the vehicle, near the fuel tank. A cover may have to be removed for access on the later models. The most common symptom of a fault in the evaporative emissions system is a strong fuel odor in or around the vehicle. If a fuel odor is detected, inspect the charcoal canister. Check the canister and all hoses for damage and deterioration. Check the charcoal canister for damage and the hose connections for cracks and damage - on 2001 and later models, the EVAP canister is located at the rear of the vehicle, ahead of the fuel tank.

The fuel tank vapor pressure sensor monitors changes in pressure inside the tank. When the pressure exceeds a preset threshold, it opens a vacuum switching valve (VSV), allowing fuel tank vapors into the canister.