Avalon, Camry, Sienna, Tacoma, T100 & 4Runner

Start engine and warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in appropriate ADJUSTMENTS article.
Shut engine off. Disconnect and plug vacuum hose at throttle opener near throttle body. See Fig 1-122. Start engine and note engine speed. Engine speed should be 900-1950 RPM.
If engine speed is not within specification, replace throttle body. Shut engine off. Reinstall vacuum hose on throttle opener. Start engine and ensure engine returns to proper idle speed.

Fig 1: Locating Throttle Opener (Avalon)

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Fig 2: Locating Throttle Opener (Camry)

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Fig 3: Locating Throttle Opener (Sienna)

Fig 4: Locating Throttle Opener (Tacoma, T100 & 4Runner)