P0507 Idle Air Control System-RPM Higher than Expected - Kia Forum
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#1 (permalink) Old 02-08-2010, 12:55 PM
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Default P0507 Idle Air Control System-RPM Higher than Expected

Did anyone encounter problem with IAC?
Description of DTC:

When the TP sensor’s signal indicates closed throttle position and the engine is idling, the ECM adjusts the idle air control valve so that the engine runs at the correct idling speed, regardless of coolant temperature, load and etc. When the additional load applied in the engine, the air flow through the IAC valve is increased momentarily to raise the idling speed.

Sorento '03 4X4 110500 miles.
Recently cleaned the throttle body - it may be related.


Help to resolve it. TIA.
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#2 (permalink) Old 02-08-2010, 01:18 PM
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Originally Posted by maksik View Post
Did anyone encounter problem with IAC?
Description of DTC:

When the TP sensor’s signal indicates closed throttle position and the engine is idling, the ECM adjusts the idle air control valve so that the engine runs at the correct idling speed, regardless of coolant temperature, load and etc. When the additional load applied in the engine, the air flow through the IAC valve is increased momentarily to raise the idling speed.

Sorento '03 4X4 110500 miles.
Recently cleaned the throttle body - it may be related.


Help to resolve it. TIA.
1)Might have done a really good job of cleaning it and vac ports out now. And need to reset ECM/ECU to fast learn mode to correct it. Or it will just stay in slow learn and get around to it in a few 100-1000 miles.
2)Or now the old dirty IAC Valve has not enough adjustment in it to give you a perfect idle. All it is really is a AIR BLEED OFF/ARTIFICIAL VAC LEAK. If teh seat for the plunger is dirty and worn asking it to now do it job like new with a brand new or cleaned to that state Throttle Body might be unable to get.
3)Or depending on whom did it and what they use to clean it. You messed up sensors and or plastic parts inside Throttle body or IAC and it is now defective. Gum Cutter like BERKIBLE 2+2 that is safe for ALL parts should have been used. Brake clean was not one of them or the like. Even some TANK parts washers are off limits unless you are for sure rebuilding the unit. and replaceing plastic washers and grommets and and gaskets and things.

Hope this gives you some direction to look and go.
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#3 (permalink) Old 02-08-2010, 01:39 PM
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I cleaned throttle body and TB was removed from manifold (but TBP sensor was still attached) and I used "Throttle body cleaner" (sorry don't remember manufacturer) not brake cleaner.

I did removed ECM fuse for more then 10 secs. after cleaning.

To remove IAC valve do I have drain coolant?

Last edited by maksik; 02-08-2010 at 10:05 PM.
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#4 (permalink) Old 02-09-2010, 11:54 AM
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I cleaned throttle body and TB was removed from manifold (but TBP sensor was still attached) and I used "Throttle body cleaner" (sorry don't remember manufacturer) not brake cleaner.

I did removed ECM fuse for more then 10 secs. after cleaning.

To remove IAC valve do I have drain coolant?
IAC should not have coolant lines? no reason I know for it. It is jsut a AIR BLEED (artificial internal vac leak/bypass) valve to get an idle. And no heat nor fluid is required to do its job. Just air to bleed/bypass. Anything is possible thou.

If you removed the fuse then did it work and you got a base idle that is now fine tuneing itself? and you can not wait 250 miles for a perfect one like you had? You do not drive much. Or is that why your here now, you waited 250 and from day one it never gave you even a slightly imperfect but getting there ldle after cleaning. And it is now clear you have a real issue? sits at 400 or 1500-2000 all day or hunts (surgeing) all day in gear or park from 500-2000 and back.

I covered all the versions of this in my other post. Pick 1-2-3 and solve for the fix or implied one it required. If you did the Throttle Body R&R job correct. Bits and peices of info given out from time to time only makes for long drawn maybe and theories situation. Car is there, we are in cyberspace, mech that you can go to and will see and hear and feel all info infront of them in REAL TIME is on the corner.

P.S. not in any way the sure cure. But smart money would look at number 2 and reread it twice again. For a 2003 vech with 110,5000. Sorta something a mech would see and stop at fast. That is if the level of the R&R and number 3 is ruled out and number 1 was done till the end with no success or you do not seem to be unable to do and live with the 250 rule if still in progress. See second paragraph above.

Last edited by 04SorentoLX; 02-09-2010 at 12:22 PM.
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#5 (permalink) Old 02-09-2010, 12:35 PM
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Thanks for guidance. I'll remove IAC and start there.
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#6 (permalink) Old 06-30-2010, 10:49 PM
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Can someone please point out where the ECU or ECM fuse is located ? (2003 Sorento)
Have done some searching but cannot find.... I must be blind

Thanks
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#7 (permalink) Old 07-01-2010, 03:11 PM
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Originally Posted by TbF View Post
Can someone please point out where the ECU or ECM fuse is located ? (2003 Sorento)
Have done some searching but cannot find.... I must be blind

Thanks
Under the hood by the battery you'll see black box fuse in there. I believe it's 10Amp, but if I remember correctly there is marking on box cover.
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