Question about 2002 Toyota Sienna
The IAC is on the back side of the trottle body on the bottom side. It is near the fire wall and difficult to get to. There will be 2 rubber hoses coming off of it as well. If it is acting up you may be able to spray carb cleaner into it to remove the gunk and build up inside it. There are some simple videos about cleaning this set up on youtube. Once you clean it, it may function fine. Replacing it can be a little more difficult.
Posted on Apr 17, 2014
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Posted on Jan 02, 2017
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The Idle Air Control (IAC) valve controls the amount of air that bypasses the throttle valve, which controls the engine idle speed. The IAC valve consists of windings, an armature, a return spring, and a rotary slide. The engine control module (ECM) pulses the voltage to the winding, the opposing forces on the armature by the return spring cause it to maintain a fixed position, adjusting the amount of bypass air to maintain the correct idle speed.
Removal & Installation
Checking Idle Air Control Valve (IAC) Triggering
Fig. IAC Connector
Fig. Showing the IAC Valve
WARNING Do NOT check for ease of movement by prying on the rotary slide with a screwdriver or other tools that could cause scratching or other damage.
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