Idle Air Control Valve

MONCHO6685

MEMBER
2003 TOYOTA COROLLA
1.8L
4 CYL
2WD
AUTOMATIC
231,532 MILES

Hi. This valve is constantly with 12v? Or is just a pulse from the computer to control the idle?

Thursday, July 29th, 2021 AT 10:24 AM

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Which wire did you check this voltage on? You should have three wires at the throttle body and yes, there should be 12 volts on one of them all the time. Then the other will be a varying signal on the RSO terminal from the PCM. Basically the PCM takes inputs from all the other sensors and then tells the idle air control where it needs to be on this RSO signal wire.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Please take a look at the info below from the manual that runs through all this info plus the testing for the IAC.

Let me know if you have other questions. Thanks

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Thursday, July 29th, 2021 AT 7:54 PM

MONCHO6685

MEMBER
118 POSTS

Hi kasekenny1. Thank you so much with the information you bring me I found the problem and solve it.
I attached some photos of the problems.
On the photo with gloves was the main problem of the idle air control valve. Someone cut the black wire.
Now the car is like brand new.
Thanks kasekenny1.
Att. Juan mar� n

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Friday, July 30th, 2021 AT 9:12 AM

KASEKENNY

MECHANIC
18,907 POSTS

Some people amaze me with why they do things. Great find and thanks so much for returning again to tell us what you found.

That info will surely help others that visit in the future. Please come back again next time you need something. Thanks

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Friday, July 30th, 2021 AT 3:12 PM