IAC Valve

[duendeverde]

Can anyone tell me where is the IAC located for a Yaris Sedan 2010? I want to clean this part since i bought m car used :/ want to clean all possible things related to Air like MAF Sensor (already cleaned), Throttle (already cleaned), put new hose, already install an AEM CAI, PCV valve (already cleaned) and the IAC valve (not yet cleaned)

Thanks:iono:

[KCALB SIRAY]

Should be connected right to your throttle body.

[duendeverde]

Should be connected right to your throttle body.

Thanks, found it this morning :bonk::bonk:

[tmontague]

Let me know where abouts on the TB it is and how easy it was to clean. I forgot to clean it when I cleaned my TB this past spring.

[duendeverde]

Let me know where abouts on the TB it is and how easy it was to clean. I forgot to clean it when I cleaned my TB this past spring.

Sure, will do this saturday. I went to buy MOC Premium Throttle-Body & Air-Intake Cleaner at Toyota. One of the mechanics recommended me to remove the complete throttle body for optimum cleaning. The sensor should be attached to the TB but i haven't look around to see where it actually is

[CrankyOldMan]

Maybe I don't understand the name correctly, but I think that in a throttle-by-wire system the throttle butterfly is the IAC valve. The throttle is driven by a servo motor, so the ECU can change the valve position automatically. A throttle-by-cable system can't adjust the butterfly, so some of them use a separate valve to adjust the idle air intake.

Perhaps someone else understands the difference better?

Edit: here's a picture of an IAC system. The 4-bolt drive-by-wire TB doesn't have any of the stuff that bypasses the butterfly.

[duendeverde]

Maybe I don't understand the name correctly, but I think that in a throttle-by-wire system the throttle butterfly is the IAC valve. The throttle is driven by a servo motor, so the ECU can change the valve position automatically. A throttle-by-cable system can't adjust the butterfly, so some of them use a separate valve to adjust the idle air intake.

Perhaps someone else understands the difference better?

Edit: here's a picture of an IAC system. The 4-bolt drive-by-wire TB doesn't have any of the stuff that bypasses the butterfly.

So what u r telling me is that an electronic throttle doesn't have that kind of valve, is just a throttle with the butterfly valve? I haven't disassemble the throttle yet :/

[WeeYari]

Thanks, found it this morning :bonk::bonk:


Given what you've said in post#7, what is it that you actually found? I'm confused.


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[duendeverde]

Given what you've said in post#7, what is it that you actually found? I'm confused.


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Behind the throttle i saw like a black case, I thought that was the IAC since i haven't taken out the throttle yet. While looking through google images (electronic throttle) that black box

For example look the image below. Almost the same as the Yaris Throttle :/

[tmontague]

I was actually thinking what Cranky stated. A drive by wire system would likely have an IAC built into it or the parts would just be redundant. I didn't take off my TB when I cleaned it but I didn't notice any extra valce or sensor. Mind you I also wasn't looking for one.

I'm not sure if you could theoretically clean the electronic throttle, but do you even need to as I don't think it would become dirty?

[duendeverde]

I was actually thinking what Cranky stated. A drive by wire system would likely have an IAC built into it or the parts would just be redundant. I didn't take off my TB when I cleaned it but I didn't notice any extra valce or sensor. Mind you I also wasn't looking for one.

I'm not sure if you could theoretically clean the electronic throttle, but do you even need to as I don't think it would become dirty?

True...but i have seen videos on Youtube about cleaning electronic throttles, the butterfly valve gets dirty on both side, I cleaned the outside of the butterfly so it would be great to clean the inside also :iono:

[CrankyOldMan]

I'm not sure if you could theoretically clean the electronic throttle, but do you even need to as I don't think it would become dirty?

The PCV/breather system sends the excess crank case pressure back to the intake, between the MAF and butterfly. If you have blowby, you can get a LOT of soot on the butterfly valve. I take my TB completely off to clean it, but it's a lot easier with my custom intake setup than the stock airbox.

[tmontague]

and that's why I have an oil catch can ;). Agreed though, depending on the amount of blowby it will all end up going through the TB