How to test a rotary type Idle Speed Control Valve

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How to test a rotary type Idle Speed Control Valve

Рет қаралды 101,058

Күн бұрын

Idle speed control valves are responsible for providing a fast idle from cold start to ensure an engine warms up quickly. They also allow the ECU to increase engine RPM should a large load be applied by say the power steering pump, Air Conditioning compressor or even if the alternator is having to produce a high output.
In this video I cover the removal, inspection, resting and operation of a Toyota rotary type Idle Speed Control Valve. These are very common unit used on may Japanese vehicles. There are actually quite reliable as a unit but do become contaminated by dirt over time. They are also a possible source of an internal coolant system leak, often very difficult to detect too...
If you have any questions or comments then please add them below.
Andy Mechanic.

Пікірлер: 181

@curious_chris Жыл бұрын

The best explanation you can ever get on IACV operations

@AadilsVlog 5 ай бұрын

The best technical video I've seen! No one else can give such a 100% perfect and clean idea about the throttle body like Andy! I have benefited so much that I do not know how to thank you!

@barryward7633 3 ай бұрын

Thanks Andy, great YT episode this the first time watching you, I am a retired Electronic service technician, so this is the other side of the my trade profession that I am used to, my mechanical limit is 2 or 4 stroke scooters that I own one been a 1986 SH-50T Yamaha Mint and the other a 1988 CN-250 Honda Maxi scooter, once again cheers and thanks for the time and effort put into making this. I currently enjoy repairing for family and friends electronic keyboards and radio's among other things as a interest to keep me busy but not for monetary gain.

@chungaleta1234 7 жыл бұрын

A better explanation, so detailed and well prepared you won't find it anywhere. Amazing

@AndyMechanic 7 жыл бұрын

+chungaleta1234 Thanks for the feedback & pleased you found the video helpful. Cheers for now, Andy

@peterlogan1623 2 күн бұрын

explained in a plain and simple way, thank you .

@haditwithwork 6 жыл бұрын

Excellent, excellent, excellent! VERY well illustrated and explained. You, sir, Andy, stand amongst the 1% of instructors that truly CAN teach! Thank you for sharing!

@AndyMechanic 6 жыл бұрын

Cheers for the feedback :-) Pleased I could be of help. Have a great day. Andy

@fieldsofomagh 5 жыл бұрын

Have cleaned this type of IAC on a Toyota in the past, but had no idea how it functioned. Took off the coil part, needlessly, and cleaned the rest of the carbon gunk. Congrats on giving an in depth explanation of how everything works. The art of teaching is not lost on you.

@User-sssss-543 3 ай бұрын

Appreciate for the video sharing, it really helped me understand the very important point of the device, and how it works in the system, thanks again!

@davidpeel8431 Жыл бұрын

Brilliant mate, yours is the best video, explanation with clear instructions anywhere. I followed your explanations, instructions and now my old Camry V6 (the YEAR 2000) is back to running smoothly and consistently idle, thank you

@tnamen1307 5 жыл бұрын

Keeping Andy mechanic alive is much more important than fixing cars!!! Great video ....keep it up!!!

@warunandg 4 жыл бұрын

You are the man Mr.Mechanic this is what we need thank you very much

@niaz.shovon 3 жыл бұрын

I had some idle issues in my Corolla, and my mech replaced throttle body with an used one. The problem was fixed. During my leisure time and out of curiosity I decided to fix my old throttle body. The main valve opens and closes perfectly fine, so I opened the IAC valve that I learned from youtube. I found huge carbon deposits in there, I cleaned up all with a carburator cleaner. Then I supplied 12v using a power adapter, and found the IAC valve closes and then back opens immediately like a springy mechanism, like an electric calling bell. Yesterday I was searching hundreds of videos to check whether this is normal or not, but found nothing. Then today youtube suggested this video and now I understand the whole working mechanism of this IACV system. I can't thank you enough :). Now my only problem is the rubber gasket got bigger than it's normal size. Looks like I have to cut and join that using super glue to make that short. I'll also apply some RTV gasket sealer.

@macegarage9603 4 жыл бұрын

Yes i've been doing this befre for years. So nice of you to share this iAcV mechanism., very much informative and detailed good for others to know. i'll continue to watch this later, see you.

@gabrielkishinevski1473 2 жыл бұрын

Excellent explanation. Thanks to you, I understand that valve now and feel confident that I won't screw it up taking it apart to clean. Thank you

@siphenathindabazonke8895 2 жыл бұрын

Wow, now he answered my question, I have my honda with similar but not exact iacv with the coolant lines disconnected and now I see where to begin with my idle issue. What a valuable information I got from this video.

@andrewbarr4611 2 жыл бұрын

By far the best explanation of these gremlins I've seen so far!

@HafizurRahman-mw8bp 2 жыл бұрын

A great teacher, tutor and mentor.

@lorenreyes2855 2 жыл бұрын

Great video! It was amazing to actually see the idel control valve working on the mechanical side and electronic side!

@babangidakawuji3239 4 жыл бұрын

Andy you are amazing you have cleared many of my doubts and worries on IAC valve.Thanks a lot

@captainwho1 Жыл бұрын

This is what I was looking for so thanks so much! My 96 Honda Civic service manual doesn't explain jack about how this device works! They don't write em like they used to!

@truthseeker803 5 жыл бұрын

Thanks man. The best video online that teach how IAC valve works. I'm lucky you explaining it on Toyota.

@AndyMechanic 5 жыл бұрын

Cheers :-)

@truthseeker803 5 жыл бұрын

Andy Mechanic sorry for bother you. I have corolla 2007, 2 years ago I took the iac valve apart to clean while I was cleaning the throttle body. I don't remember when the current rough idle started, now the car idle is rough, when i engage the AC, the idle shakes a lot. But when it's cold, the idle is great, but immediately after few minutes when the car gets hot, the idle is rough and the rpm drops to 730 to 750.Someone told that i might have messed up the factory calibration when i took it apart. But since i had no clue, i don't remember anything when i took it apart. What do you suggest and think? Thanks

@truthseeker803 5 жыл бұрын

@@AndyMechanic I tested the resistance of the coil and one side gives me 19.8 kohm, but the other 47.2 kilo ohm. I did your visual test and made a circuit and doesn't open at all even though the RSO resistance is 19.8 but still doesn't open at all. the RSC does even close and has resistance of 47 kohm. what do you think?

@AndyMechanic 5 жыл бұрын

The primary side of the coil should have low resistance (thick wire, few turns) the secondary winding high resistance (thin wire many many turns) - it looks like your coil is faulty...

@truthseeker803 5 жыл бұрын

Andy Mechanic thanks for the reply. First what do you mean by primary and secondary winding?. Secondly, But I'm wondering if it's faulty why it doesn't trigger check engine sign?

@takundachigumbu4764 3 жыл бұрын

Thanks Andy, I had this problem after replacing my Toyota Wish 1ZZ FE engine and reused my old inlet manifold and throttle body. Today I managed to resolve my high idle speed by doing exactly what is in your clip.

@johntroyplacido364 4 ай бұрын

great video. very clear and informative. got enlightened with this one. God bless!

@tomrepurpose2770 2 жыл бұрын

Smart man. Even better an educator. Even asking to share utube so others may have their query satisfied

@davidswezene1102 Жыл бұрын

Better than the "Average Bear" can even attempt to explain. Am much older than you, but know excellent teaching skills when we see this. More like this? Bravo Mate! 😳

@kumars172 8 ай бұрын

just blown away by your explanation

@dougg1075 4 жыл бұрын

I see a lot of channels saying it fixes idle.. yes it does but it also can fix idle + hesitant acceleration, so drive ability as well

@areid1440 Жыл бұрын

You are indeed a great teacher!

@OG101ful 4 жыл бұрын

Keep doing the good work. This video has helped me alot.

@marvinhenry5821 2 жыл бұрын

Very Detailed explanation. Great job!

@simonburns1055 5 жыл бұрын

Amazing video solved my problem with Corolla thank you so much for your in depth tutorial and insight, very rare these days. A Bi-metal spring wow.

@davidsstfarrelltighe 7 жыл бұрын

great video dude they didn't teach us about this in collage so really helpful and very well and clearly explained

@AndyMechanic 7 жыл бұрын

Thanks David for your feedback, it's most welcome and helps give me the motivation to continue making the videos. I'm happy you find them helpful. Cheers Andy

@romeoquijano7186 3 жыл бұрын

Thank you sir Andy! More power!

@owengabriels549 3 жыл бұрын

Thank you Andy very profesional just what i need. RSA

@MrRobert1603 7 жыл бұрын

any isc valve i removed needed a IMPACT SCREW DRIVER YOU GOT LUCKY thanks from new york city USA.

@AndyMechanic 7 жыл бұрын

+MrRobert1603 Haha! Yes, you are probably right! Pleased you liked the video & Cheers for the feedback. :-)

@froglegs4910 4 жыл бұрын

Great video ! I believe your customers really enjoy your auto mechanical service you done for them ! thanks lot !

@ALI-yi9vr 3 жыл бұрын

Dear Andy, explained well,got depth knowledge. and enjoyed ur vedio.

@edh656 5 жыл бұрын

Dude...you have a gift for teaching... great...great... great video!!!

@AndyMechanic 5 жыл бұрын

Cheers Ed, appreciate your feedback. Have a great day. Andy

@thabisovanrooi8809 Жыл бұрын

Thanks very much for Andy

@diongswa7538 4 жыл бұрын

just caught your work. Got a subaru 93 and it quit idling on me. Gave me some good info. Thanks.

@ChristosCMelbAustral Жыл бұрын

I had same problem with my 1991 Subaru Liberty. This is what I did: First, I disconnected both battery cables. I then disconnected Throttle Valve Sensor. I then took off the air supply to the throttle valve, you know the big round pipe. I then pushed the gas/petrol pedal to the floor and kept it there with a long stick against the car seat or you can put a heavy brick or other object against the pedal. Find a piece of 4mm thick masonite and cut to the following dimensions: 300mm(length) x 250mm(width). Attach a piece of lint free rag. Tie the rag on the masonite with a strong string. Spray ONLY throttle sensor cleaner on the rag and start cleaning throttle valve and the sides gently. Be careful you don't drop anything in the throttle valve barrel. It could end up on top of a piston. When rag is dirty replace with new one. Do not spray throttle sensor cleaner directly inside throttle valve area. When you finish cleaning take the pedal stick away, reconnect the throttle valve sensor, then reconnect Battery ( + ) cable first and then Battery (-) cable. Reconnect air supply pipe and hoses that you may have taken off to help you to access the throttle valve. Start your car and let it idle until engine is warm. The ECU may need a few days driving to adjust to the new settings. Before you start have a look at some KZfaq videos to understand how to clean the Throttle Valve. Some videos are on Subaru throttle valves. If cleaning the throttle valve doesn't help then you might need to go for the Idle Speed Control Valve. I haven't tried cleaning that yet. There is more involved with taking that off and cleaning it. You will need to disconnect and block coolant hoses. Good luck. My car used to stall at lights or as I was driving along. I then started again go 50 metres and then it would stall again. My mechanic tried to fix it twice but was unsuccessful. I'll never go to him again.

@GustavoHomemLuz 4 жыл бұрын

Exactly what i was lookin for, thank you so much man!

@frankdooley6451 2 жыл бұрын

Brilliant explanation, cheers.

@sean-pauldemercado4212 Жыл бұрын

Great watching your videos

@linlaobei1 3 ай бұрын

Great instructions!

@e.stgo.7998 3 жыл бұрын

Is a solenoid valve with two magnetic fields.👍👍👍👍👍EXCELLENT VIDEO, very informative, accurate and verywell explained. 👍👍🇵🇷👍👍

@ThisaraGunathilaka 5 жыл бұрын

Nice explanation. Good job.

@carlososorto721 3 жыл бұрын

Nice excellent explanation about IAC I like

@hughmiller9595 5 жыл бұрын

just what i wanted to know, well presented ,many thank you's.

@dougjones4987 6 жыл бұрын

Excellent teaching

@AndyMechanic 6 жыл бұрын

+Doug Jones Thanks :-)

@on-site4094 3 жыл бұрын

thats a great in depth explanation 👍

@pasucones6822 6 ай бұрын

Excellant discription

@chrispulham4779 Жыл бұрын

Hi Andy,, MERRY XMAS to you all. I did my valve clearances( in-0.10,,,,,ex- 0.18) and as you said the exhaust was a real bustard. Motor sure rattles now. Reset the computer, cleaned the ICV and all is going again like new. Thanks for all your help. Cheers Chris (Qld, Au)

@kelvinskada5619 4 ай бұрын

Excillent, helpful, thanks brother

@majidhajiaghamohammad7775 2 жыл бұрын

thank it was very help full

@jimschiltz5343 5 жыл бұрын

Excellent teaching, Andy! Greetings from the U.S.A. Subscribed!

@AndyMechanic 5 жыл бұрын

Thanks James :-)

@eduardofan357 3 жыл бұрын

Thumbs up ! The best explanation

@muratgun7490 Жыл бұрын

awesome vid bro. thanks a lot.

@rhkips 7 жыл бұрын

If you can find an IAC noid light, it makes for a great little disco light on a properly functioning system! It was really neat seeing this rotary style IAC taken apart! I had no idea they had an entirely mechanical fast idle like that. Cool! :D

@AndyMechanic 7 жыл бұрын

Thanks rhkips for your feedback, I'll most likely be making some more videos covering other types of IACs at some point too :-)

@tallman8ft 2 жыл бұрын

Thank you ever so much for sharing your experience with us.have a Honda and that valve has been giving me hell.must information I have ever gotten on those valves , definitely subscribing....cheers

@shadreckmilala7647 2 жыл бұрын

You are simply the best

@terencexavier6139 6 ай бұрын

just brilliant A clear explanation

@enhancesoutheast5964 3 жыл бұрын

Excellent video.. Very clear..

@maesterkrab763 Жыл бұрын

what a very nice explanation about the principle operation of aicv, i subscribe for more man! more power!👍😀

@donaldwilliams2270 11 ай бұрын

Great Vid Professor , just don't forget to clean unblock the water ports

@oswaldogil8387 2 жыл бұрын

Thank you Andy Great lesson!!

@Ozzy3333333 9 ай бұрын

Awesome, well done, thx!

@gazwanasadi7437 3 жыл бұрын

You are the best .... thank you sir

@enhancesoutheast5964 5 ай бұрын

Excellent video..how technical video's should be made..❤

@michaelsanchez8457 4 жыл бұрын

Great breakdown. In other people's advice on this part, they have discused diagnosing through a use of an underhood diagnostic box, where you can jumper across a terminal, and the rpm should increase, which I guess means it is signaling the IAC to open? So it must be a jump of ground to the RSO terminal?

@matthewbrown5677 Жыл бұрын

Very very good video….If my 2002 Toyota is idling high at 2000 rpm would the little door be fully open

@essamhassanel-baghdady3511 3 жыл бұрын

Man .. This was beyond amazing and interesting video I enjoyed watching it. Can you please make other videos about other types of IACV's, also about other sensors dismantling and testing? .. Cheers.

@DananjayaYogieHartanto 7 ай бұрын

The TPS sensor and the IACV shown in this video have the same shape and appearance as my Suzuki G16B engine.

@johnburns4017 4 жыл бұрын

The grunge inside the water section can be removed by radiator flush fluid, without removing the valve from the throttle body.

@rickfyi 6 жыл бұрын

Excellent video!

@Chelnaya 2 жыл бұрын

Very helpful!

@everardocamacho5063 5 жыл бұрын

Great video andy, very well explained, cheers from Ontario ca

@cameronmay843 3 жыл бұрын

Great video! Was going to comment about how slow you get to the point But it was well worth the 5 minute introduction.

@puremongrel100 7 жыл бұрын

hi andy ,great info & more important delivered easy style ,great work ,left in no doubt of i.a.c. funtion much obliged

@jamespaterson7597 4 жыл бұрын

very interesting thank you

@thabisovanrooi8809 Жыл бұрын

Mr please help me to know if throttle valve is bad because it doesn't closed properly

@abbashassan6536 7 жыл бұрын

Really really you are a creator

@richardbrooks213 4 жыл бұрын

thank you

@nobrizzle Жыл бұрын

The part about the duty cycle is what surprised me. That being said, I tested the signal coming to the ISC connectorand I only get a solid reading of above 12V on the RSC pin (uppermost pin from ground) to the center B+ pin (battery positive) and I'm wondering what could cause that? If this is "duty cycle", I'm assuming there's signal going to both ground pins and the computer is varying it according to the needs of the motor like you said. I'm guessing the RSO (Lowest pin) should have some larger value of voltage than the RSC pin when starting cold. The reason I say that is when I connected just the RSO pin as ground with 12 volts positive to the B+ pin with a jumper cable, it idles high like it should when the engine is cold. When testing with a multimeter, the RSO pin voltage shoots up to 9V and then drops immediately w/o me doing anything when the ignition is in the ON position w/o starting it. I double checked this by using a computer from an old same model car (Toyota Previa) I had, and the same 9v initial voltage jump happened and went back to 0. Whoever is reading this, if you're idle is working correctly, taking this reading would only take a few minutes and would help me tremendously. Maybe when I fixed my MAF awhile back (apparently the solder joints are temporary - kzfaq.info/get/bejne/eb5zo7ybktjDnH0.html) I soldered something that now is causing this problem...hmm....still thinking about that one...

@jaccolenoco6548 10 ай бұрын

Hi Andy, this is good stuff! Just a quick question though... when you removed the isc motor from the housing, is the sealant orignal from the factory? Thank you

@AndyMechanic 10 ай бұрын

Golly, sorry, it was a few years ago & I can't be sure. Andy

@RosendoRamos-wb7lf Жыл бұрын

great info

@shimxininahi8024 5 ай бұрын

How do the Engine Coolant Temp Sensor and this Idle Speed Control Valve relate to idle speed? On a Camry 1mzfe the ECT sensor reads at the outlet if temp is up ECU should drop idle speed vise-a versa. To drop the speed, do the ISCA receive an influence from what the ECT read? I understand the ISCA also reads the temp from inlet temp before the thermostat valve to influence the the ISCA bi-metallic coil. Is either one more dominate? What is possibly keeping the idle high at 1400rmp if the ECT sensor outlet and ISCA are already at Operating Temp? I got a new OEM ECT Sensor. Occasional, 400rmp made me change the ECT sensor. And idle would drop from 1100 to 400rmp if the old ECT Sensor was disconnected but there is no change if the new ECT Sensor is installed. I hope I didn't missing something in your great explainable video.

@alexbermudo2525 2 жыл бұрын

Thank you verry much sir,,,from the Philippines,,,what about the power supply of the idle up,,GOD BLESS YOU AS ALWAYS,

@asurwyatt 2 ай бұрын

Would that cause the idle to fluctuate, up-and-down, if something were wrong with that

@AndyMechanic 2 ай бұрын

Yes, definitely

@ziggassedup 7 жыл бұрын

Good job mate.

@AndyMechanic 7 жыл бұрын

Cheers & thanks for the feedback. Andy

@markpersaud5768 3 жыл бұрын

Yo u are good bro keep it up

@donanderson4756 4 жыл бұрын

Enjoyed the video! Nicely done., very detailed and well explained operation of these little devices. I have toyota which has sat for a while. It starts and runs well wit throttle open but at idle stumbles to a stop like choking itself to a stop. I have cleaned and loosened this valve as it was stuck but still have the problem. Any suggestions?

@AndyMechanic 4 жыл бұрын

Hmmm....could be a few things, have you checked fuel pressure & quality? Fuel can go off over time so maybe drain the tank & give it some fresh fuel, just to eliminate that possibility Other than that I'd test map sensor & check all the vacuum pipes as these perish over time. Hope this helps. Cheers Andy

@raffuy9745 2 жыл бұрын

Very informative. Thanks, Andy! subscribe and like

@reidjones8677 Жыл бұрын

Great detail, mine is on a 22-RE truck 86 and it has a different air valve. Mounted below the throttle body and connects the air by rubber tube. It only has two terminals and the Ohm reading is correct based on the Toyota Manual. My truck works perfect until idle and then it will just go dead. Or it might run 4 days perfect then die. Have replaced or checked everything except this valve and the CPU or main board. Is it a given that if the Ohm's are correct that the valve works? I haven't opened the engine water temp side to check it. The opening at 65 degrees was closed too much so I opened it to match the manual. Any advice this has been going on for over a year. All the 22-RE guys are too busy to work on it. Thanks,

@LNSKPRODUCTIONS Жыл бұрын

Go ahead remove the IACV and there is an adjustment screw.

@frankdooley6451 2 жыл бұрын

My Toyota Avensis 2016 1.6 ltr petrol cold start sometimes revs up and down while idling to the point of almost cutting out until the engine warms up then drives perfectly ok. After I've stopped it can be hard to start but only if it's had the revs up and down issue during the initial starting other than that starts fine. Any thoughts.

@AndyMechanic 2 жыл бұрын

Hmmm....it could be that the fuel pressure non return valve on the fuel pump is leaking so pressure is not maintained when engine is turned off. This could also prevent fuel pressure meeting spec so it's a little low for cold start. I'd fit a fuel pressure gauge & check that first Cheers Andy

@leveshramchurran2072 4 ай бұрын

Andy! MAYDAY! Lol. My 2006 corolla idles fine when cold but once the engine is warm, the idle drops and feels as if its going to stall when stationary. When i turn on the AC or Lights etc., the idle increases. Could it be that the iac valve is the culprit?

@forgetfulme1719 2 жыл бұрын

Sir, what is the function of the vacuum pipe outlet on the IAC? where it connects to?

@7thplanet121 Жыл бұрын

If the engine doesn’t idle less than 1200rpm. Does it mean that when I reassembled the valve I was a bit off with the valve plate? I moved the adjustment screw on the accelerator until it makes no difference on the idle speed. It started at 1500rpm wanted to take it down to around 800 to 1000rpm. Any suggestions?

@lingli314 4 жыл бұрын

I mistakenly dissemble that w/o marking then i have the problem about the exact position and nobody explain that the heat change the property of the spring.

@cemirosi 3 жыл бұрын

Thank you very much for this detailed video. I have a trouble shooting on iac valf of Toyota corolla ae101 4 afe . I cleaned the throttle body and replaced it. But idle speed is little bit high, the speed is 1250 in minute . On lpg is normal but when I activate the fuel benzine is 1250 rpm in one minute. I touched the iac valve shaft during the cleaning it. Please tell me which side I should adjust the idle shaft for regular position left or rihgt side thank you very very much for help.