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More Information on the IAT modification – Follow Up

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IAT Modification Scam - Do not bite this bait!

After publishing our article about IAT resistors, many people have been requesting related information not included in the mentioned post. Here we are including some
of that info.

The original article may be accessed at:
http://qcwo.com/technicaldomain/?p=64#more-64

NOTE: For easy calculating the resistor you need, just use the online resistor color code calculator: Resistor Color Code Calculator

What does “IAT” stands for?

IAT = “Intake Air Temperature” sensor. On some vehicles, the info of this sensor is very relevant, making considerable changes depending on the value present on this sensor, while in other vehicles it will cause very small changes.

What is the resistance of X model?

Honda IAT:

Degrees F Degrees C Equivalent Resistance
-4 -20 15k – 18k Ohms
68 20 1k – 4k Ohms
176 80 200 – 400 Ohms

BMW IAT:

Degrees F Degrees C Equivalent Resistance
20 -7 4.7k – 5.2k Ohms
68 20 2.2k – 2.7k Ohms
120 49 760 – 910 Ohms

Toyota IAT:

We don’t have the info on the Toyota Corolla handy at this moment, but below you will find how to identify the connection of the iat from the maf sensor. That should be enough for doing some simple temperature tests as described in the first published article about this. Just search for “IAT” on the form at the top of this page or look at the link elsewhere at the beginning of this article.

Toyota Corolla MAF / IAT Wiring

As you will see in the image above, the pinout seems to be inverted. This is because the reference is taken from the harness connector terminal and not from the MAF connector terminal. Only two wires (4 and 5) connect to the internal IAT. They are; Yellow with a black stripe and Brown (or Orange in some models). Remember that the IAT has no polarity and it can be connected without taking care of that.

Hyundai IAT:

Degrees F Degrees C Equivalent Resistance
32 0 3.3k – 3.7k Ohms
68 20 2.4k – 2.8k Ohms
104 40 1.6k – 2.0k Ohms
176 80 500 – 900 Ohms

Where can I find the IAT sensor?

IAT sensor for Honda Civic:

Below is pictured the location of the Honda Civic and Integra location of the IAT sensor. It is right after the intake air hardware, at the beginning of the plenum. This is a two-wire connector.

Honda Civic / Integra IAT sensor location

IAT sensor for BMW 325i:

The BMW manual for the IAT sensor location is very simple and do not provide location pictures. They are describes as follows:

92-93 BMW 325i: “on throttle body assembly, behind throttle valve switch

93-95 BMW 325i: “on left side of engine” (Dohh!)

IAT sensor for 2004-2005 Corolla:

You will find the MAF / IAT installed in the incoming air path, right on top of the air filter on the 2004-2007 Toyota Corolla. It has a 5-wire connector.

Toyota Corolla MAF / IAT sensor location

These are based on search statistics. Any other model you wish to be added, please just requested below in this page’s “comments” area.

Thanks for reading,

Richard

(C) Copyright - TechnicalDomain.Net

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Comments
March 21, 2009

heeeyyyyyy!!! thanks!!! been looking for this info for long. will try it tomorrow!

PostedbyPaul
March 21, 2009

I am glad to help. I just hope that you don’t be disappointed if the IAT mod doesn’t do anything. I mean, be mentally prepared as we are just giving away this information in an attempt to stop people scamming on eBay and now beyond eBay. This is provided as an option for people who want to try the IAT resistor modification anyway, so they can do it without paying a pennie to those scammers.

Soon we will be posting the info on the color codes for resistors as a complement. While it is done, you will easily find that information on Google or Wikipedia.

Regards,

Richard

Postedbyadmin
March 23, 2009

Step out from those placebo resistors! Get high quality performance chips at:

http://www.OtherDeal.com

Postedbyadmin
July 1, 2009

gr8 info about the iat mod
but 4 me a little bit late
I’v been mailed mine
now I must try it out
pls. need u’r help
where is the IAT in my nissan Altima 04 2.5

pic’s help if av available

Postedbydesertdude
July 2, 2009

Hello. I am amazed that many people still have success selling such a rip off and they don’t even send installing instructions.

Your info is as follows:

The IAT sensor in the 2004 Nissan Altima is embedded with the MAF sensor.

The MAF sensor is located in the incoming air path at the left side (driver’s side) of the engine compartment.

The MAF has 5 wires on its connector and the IAT is directly wired to the wire #5, which color is YELLOW with GREEN.

The resistor can be wired from that wire #5 to any of the two black wires in the same connector, which are #3 and #6 (Yes, it has 5 wires, but for some reason they are numbered 2,3,4,5 and 6).

Please remember, one lead of the resistor is wired to one of the black wires, but the black wire is NOT cut or disconnected from the MAF sensor. Otherwise you will cut an important ground connection needed by this sensor, making possible erratic behavior of the vehicle.

The other resistor lead is wired to the #5, and the wire must be cut from the MAF, leaving enough length on the wire that goes to the MAF, so it can be reconnected in any future time you wish to do so. Just cover it with electrical tape or a wire nut.

I am sorry, but at this moment I have no picture for this, but the connection will be something similar to what is explained in the pictured diagram on the following Ford article:

http://qcwo.com/technicaldomain/?p=368

By the way, I don’t know what you bought, but typical resistance values for the IAT of the 2004 Nissan Altima is as follows:

14 F (-10 C) = 7900 – 9300 Ohms
77 F (25 C) = 1900 – 2100 Ohms
176 F (80 C) = 310 – 370 Ohms

Good luck,

Richard

Postedbyadmin
July 2, 2009

1st. cheers & lots of thanks 4 u’r info and help
I’m ready to try it out
hoping 4 some kind of change

2nd. sorry 4 my Ignorance
but whats (resistance values) and whats its importance to a dope like me

yours truly

Postedbydesertdude
July 5, 2009

Desertdude:

The incoming air temperature read by the ecu, will be altered (fooled) by the resistor replacing the IAT and this false registered temperature will depend on the amount of the resistance.

Please check the first article on this on the link below:

http://qcwo.com/technicaldomain/?p=64

Regards,

Richard

Postedbyadmin
July 20, 2009

“спасибо за инфу”

PostedbyХакер
July 20, 2009

Your welcome Xakep

Postedbyadmin
August 28, 2009

i have an 06 3.0 v6 ford fusion my MAF and IAT sensor are one in the same but i have 6 wires how do i find out which wires to connect the resistor to also im not wanting it to be a fixed resistor i have plans to place a toggle switch in the mix if you can help please do.

PostedbyAj
August 29, 2009

Hello Aj.

Yes, in the Fusion, there are 6 wires in the MAF, of which, the internal IAT is wired to #1 (Violet/Gray) and #5 (Black/Green).

In this case, the connection must be done by opening (cutting) wire #1 and connecting one lead of the resistor to the part of the cut wire that goes to the ecu and the other resistor lead must be connected to wire #5, without cutting it from the MAF.

For a clearer idea on using a switch to be able to select between “Normal” and “Mod”, you may check this image:

2006 Ford Fusion IAT sensor using a switch

Cheers,

Richard

Postedbyadmin
September 3, 2009

again I would like to say thanks for the help on my 06 ford fusion the diagram was perfect now i heard this rumor that if you take the resister and hook it to a 3way toggal switch that you can set the top position to run rich the center as stock/off and bottom to run lean is this true or possible?

PostedbyAj
September 3, 2009

Hello Aj.

Well, electrically, it is possible. You can use a toggle switch, putting its common terminal to the IAT wire that goes to the ecu and then select any of the three possible positions, being them, (1) one connector to the normal IAT on the MAF, and the other two to a couple of resistor values, (2) one for rich and (3) one for lean.

As you may have noticed, it will take one three way switch and two resistors, not just one.

Check the picture below:

2006 Ford Fusion IAT sensor using a 3-state selector switch

It all depends on your car. If you are getting any change in performance, consumption, fueling or ignition, then you are on your way. Otherwise, it will be a waste of time.

Best regards,

Richard

Postedbyadmin
September 15, 2009

Sir,

I wish I had come across your information before wasting the time and money for that resistor sold to me on ebay as a fuel performance chip. Man do I feel like a dummy.

But I do have the chip, and know where the MAF is, but do not know which of the wires to hook it to. Perhaps you can help. I have a 2010 toyota tundra V8 4.6 ltr engine. I am saving to buy a full program.

I appreciate any help or assistance you can give me to atleast try it out.

Have a great day -Duck

PostedbyDuck
September 15, 2009

Hello Duck.

Unfortunately, I don’t have the information on the 2010 model, but if like it is been happening so far, the MAF from a prior model might have the same configuration.

I have the information on the MAF for the 2008 Tundra. The only thing is that it is supposed to be 4.7L instead of 4.6L as you mentioned.

Anyway, the MAF from the 2008 model has 5 wires, on which the IAT is connected to wire #4 (Yellow/Black), so the connection should be made in the same manner as the other ones explained on this article, across that wire #4 and a ground reference, which is wire #5 (Brown).

2008 Toyota Tundra MAF / IAT sensor resistor

In a note apart from the topic, eBay buyers like you should take action and leave a negative feedback to these sellers as this is dishonest business and sellers know it. Most of them are kids selling a concept that doesn’t work and once they have your money, as in this case, they don’t even give installation instructions.

I think that the word should be spread and tell people about this article so they don’t get fooled. I am not selling the idea nor the instructions or even asking for money for information on this blog. Just giving people the choice to do it their selves if they have any doubt on if this either works or not, without being ripped off.

Well excuse me for this. Good luck on your project.

Thanks for reading this article,

Richard

Postedbyadmin
September 16, 2009

Mr. Richard,

Thank you so much for your time and consideration in this matter. I have contacted ebay about this scam and got back some pretty sad news from the seller. He is only worried about his feedback rating. I researched his previous feedback and he has 9 negative feedback on the same situation.

Once again I greatly appreciate your assistance.

Have a great day – Duck

PostedbyDuck
September 21, 2009

I bought one of these off ebay for 25 bucks, he said it was a chip, got it in the mail 7 days later. cracked that case open to see a resistor hot glued into a plastic case with wires wrapped around each end. I filed claims reported scam to ebay and I finally did get my money back, got to keep the 20 cent resistor too! I just hope Ebay will get rid of these jokers, they’re making thousands of dollars every month selling at 25 dollars a pop. and selling 10 or 20 a week. if i had no heart i’d probably open up my own “ebay store”…but i wont.

thanks for the info…if only i had done the research a week earlier… ;)

Postedbybruce
September 21, 2009

PS. I too contacted the seller and after giving him a negative feedback he told me that if i reversed it to positive he’d give me a refund. I’m not rich so i had to do it. :(

Postedbybruce
September 21, 2009

Thanks for your comments Bruce. Very well appreciated.

Postedbyadmin
September 22, 2009

you can show me a celica gt 2001 MAF/Ait i need to know what cables are de AIT PLEASE HELP ME

PostedbyRichard rosario rivera
September 23, 2009

Hello Richard.

In your car, the MAF/IAT has 5 wires also.

The IAT is wired at #4, which is [Blue/Red]. In this case, the hook up must be done like in the last drawing above, by cutting wire #4 (MAF side) and attaching one lead of the resistor on that same wire at ECU side.

The other resistor lead, must be connected to wire #5 (Brown), without disconnecting it from the MAF.

It is the same as the last drawing above. Just some colors change.

The pinout is as follows:

#1-Black/Red (MAF B+)
#2-Yellow/Green (MAF E2G)
#3-Green/White (MAF VG)
#4-Blue/Red (IAT)
#5-Brown (Ground)

Cheers,

Richard

Postedbyadmin
September 25, 2009

hello, I have an Audi A3 1.6 8v 2002 102 hp
can you tell me where is my iat sensor?
I am very grateful if you help me

thanks

PostedbyMAX
September 25, 2009

Hello Max. I regret I don’t have any information on A3 models. The best way I can try to help you is showing below, the location of the IAT on the 2002 Audi A4.

May be the location on the A3 is the same or at leat, may give you a clue.

Best regards,

Richard

2002 Audi A4 IAT sensor location
Postedbyadmin
October 2, 2009

I seem to be having trouble finding my iat wires. I have a 1993 ford escort gt with a 1.8L DOHC. It has an iat sensor combo with seven wires. Does anybody know what two wires i\’m looking for?

PostedbyPeaBodyX
October 3, 2009

Hello PeaBodyX.

The seven wires are as follows (not in a exact order):

- Red / Black stripe (IAT)
- Black / Lt Green stripe (GND)
- Red (VAF)
- Lt Green / Red stripe (VREF)
- Black / White stripe (SigRET)
- Lt Green (DtaLNK)
- Black (DtaLNK GND)

As you can see, the IAT is wired to the first one in the list above (Red w/ Black stripe), so the resistor should be connected from there to the next one in the list, which is a ground (Black w/ Lt Green).

The first wire should be cut and the side that goes to the ecu is to be connected to one of the resistor’s leads and the other lead should be connected to the second wire (GND), whithout disconnecting it (No cutting) from the Flow Meter sensor.

Cheers,

Richard

Postedbyadmin
October 3, 2009

Excellant, Thank you

PostedbyPeaBodyX
October 9, 2009

Hello I’m Gianluca, are very grateful if you tell me
Where is my IAT sensor.
I have a Peugeot 206 1.6 16v with Debimetro Bosch 6 pin.
I think it is the same as the Mazda.
Please help me …

PostedbyGianluca
October 9, 2009

Hello Gianluca. We don’t have much (almost nothing)) information on Peugeot models. But anyway, I will try to help. What model year is your car?

Postedbyadmin
October 18, 2009

what shold i use in a honda accord 98 i whona bring the air to like -4 or more what ohms shod i bye this 3.3k – 3.7k Ohms

please help ?? TX

Postedbymelo
October 18, 2009

Hello Melo.

On that car, with a 3.3K – 3.7K resistor, you will simulate around 68F degrees (20C degrees).

The Honda Accord values are as follow:

-4F (-20C) = between 15K and 18K
68F (20C) = between 1K and 4K
176F (80C) = between 0.2K and 0.4K (200-400 ohms).

Good luck and thanks for reading.

Richard

Postedbyadmin
December 15, 2009

please help for resistor ohm and cable colour for IAT sensor for hyunday elantra 1995?
kind regards

Postedbyaura
December 15, 2009

Hello Aura. Thanks for reading.

About your 1995 Hyundai Elantra, the IAT is embedded with the MAF sensor which has 6 wires. The IAT is directly connected to wire #4 (Green/Blue) and #6 (Black/Green). The wiring is as follows:

Wire #1- Green / Red
Wire #2- Red
Wire #3- Green / White
Wire #4- Green / Blue (IAT #1)
Wire #5- Brown
Wire #6- Black / Green (IAT #2)

Best regards,

Richard

PostedbyRichard
December 15, 2009

thanks… great forum.. fast solution, will follow again

kind regards….

PostedbyAura
December 15, 2009

i am sorry but i do not how ohm to use resistor for hyunday elantra 1995 ?kind regards…

PostedbyAura
December 15, 2009

Aura, I am sorry. I forgot to write the resistance values.

Here they are:

Temperature Resistance
—————– —————–
32F (0C) 6K (6000 Ohms)
68F (20C) 2.7K (2700 Ohms)
176F (80C) 0.4K (400 Ohms)

Remember, the values don’t need to be exact. You can use commercial available resistors with approximate values. For example, for 6K, you can use 6.2K or 5.6K which are the closest available values.

Richard

PostedbyRichard
December 16, 2009

:D thank you very much for faster respon. wish you success.

kind regards

PostedbyAura
December 16, 2009

Hi,

I am looking for color code used for the wire which sends the temperature signal to ECU from IAT in 2007 Suzuki SX4 1.6 Petrol. There are 5 wires in the plug
1) Blue & Grey
2) Yellow & Black
3) Green & Black
4) Grey and
5) Red & Black

I have purchased the performance chip from magnumtuning.com named by them as Dyno Boost and would want to try it out, which I know may not work.

PostedbySAM
December 17, 2009

Hello SAM.

We don’t have the information about the color code on that model, but we do have a picture of its configuration. The picture below will help you do the connection.

Thanks for reading,

Richard

2007 Suzuki SX4 IAT Sensor inside the MAF
PostedbyRichard
January 12, 2010

How anout Toyota Echo 2003 where is ITA ?

PostedbyMKD
January 16, 2010

>>How anout Toyota Echo 2003 >>where is ITA ?

You mean IAT? It is embedded with the MAF and is located near the battery.

The MAF has 5 wires, where the IAT is directly connected to #4 and Ground #5. It is as follows:

#1 – BLACK (MAF)
#2 – VIOLET (MAF)
#3 – PINK (MAF)
#4 – YELLOW/BLACK (IAT)
#5 – BROWN (Ground)

Good luck,

Richard

PostedbyRichard
January 17, 2010

After reading all the info, I’m confused as to your final opinion of these resistors. On one hand, you seem to be giving lots of advise for people to DIY their own but on the the other hand, you call them a “scam”? The only scam seems to be that people are buying a part for $25 that may only cost a couple of dollars to make but that isn’t a scam – it’s just business and if you applied that same logic to most of products you buy from WalMart that are made in China – the same “scam” would apply. So the question really is – do these resistors actually work and provide any performance increase? With so many people here looking for DIY advise, the answer would seem to be YES?

Postedbythomas norman
January 19, 2010

Hello Thomas.

Thanks for reading.

I hope you have already read both articles on this blog about this topic.

About your comments, I do think it is a scam for three major reasons.

(1) You pay $15, $20 ,$30 or more for something disguised as high technology circuit box, when it is just a resistor which you can get for less than 50 cents, even less if you buy in large quantities. Now that this information is public, they are using fake circuits to sell their scam.

(2) There is not even a single case where the power gain using these boxes or resistors have been proved in a dynamometer (dyno). So if there is any gain, it is not noticeable, at least by instrumentation. What it is been proved so far is the placebo effect, that with the mere fact that something has been installed on the engine, people think they feel some gain at least.

(3) And the worst reason is that who sell these resistors disguised in fancy boxes, claim gains as large as 20, 30 and even 50 horsepower, which is a mere and blatant lie. Making such a statement is even an insult to customers looking at the “product”, like saying “I know you are dumb and will believe whatever crap I put in this sale”.

The reason I put the information and even help people find the facts for their cars, is for those who won’t just take my words and would like to try it anyway. That is an intelligent way of thinking and I am in favor of that, so the least I can do, having the knowledge, experience and information on hand, is to help them do it them selves without paying a dime to those scammers.

I am pretty sure that most of those who have tried so far, have realized that it is not worth it.

I invite all of them to leave their comments about this, as I am generalizing and may be it was worth doing for someone.

I hope that with the new FTC laws, those scammers with their fake testimonials are taken down, out of business, if that can be called a business.

Again, Thomas, thanks for reading and you are welcome to leave your comments any time.

Best regards,

Richard

PostedbyRichard
January 21, 2010

The following comment was sent to me through email form Ian. I asked for permission for posting it here, so it can be shared for for the benefit of other readers and see “the both sides of the coin”.

——-

“Hi, I just bought an IAT “module” from Ebay for my 89 supra turbo. Inside as you state just a 12k resistor! IT WORKS!! on a supra anyway. I have put a switch on the side of the little plastic box so I can switch it ,on-off, When the weather is hot I guess. It was worth a fiver for the info. So there you go it will work on an old supra! Lev.”

Ian, thanks for your comments. In cases that people is satisfied with the results, like in your case, at least you could have saved some money just by reading the information here before buying.

I appreciate your comments very much,

Richard

PostedbyRichard
February 23, 2010

i need maf diagram or pics.for a 1995 bmw 325i lookin for the ground and the signal wires on the maf?or the maf sensor pin lables?

Postedbypete
February 23, 2010

need the ground and the singnal wires to hook up a chip from midwest autosports performence modules…..not sure about it????

Postedbypete
March 7, 2010

Hi.can you help me out with the iat sensor wiring on my 03 a4 3l engine.i had bought one of those resistor off ebay from xlm motorsport.

Postedbyhung
April 2, 2010

Purchased a SLR Motorsports performance chip for my 2006 Tundra 4.7L V8. I have a Hitachi sensor AFH70M-47 Number 5 pin blk/wh, #4 yel/gr, #3 red/yel, #2 blk/yel, #1 red. The point being, the diagram they sent for hook-up did not even apply to my wiring configuration (colors / location). I need your advice for this year model truck, as per installing this chip. Or should I go ahead and admit that I have been completely suckered and return the chip before cutting my wires and possiably causing future damage to the circuit? B41

PostedbyBobby
July 2, 2010

where is iat sensor for honda accord 2003 v6, i cant seen to know which one i should put it on since there 2 wires

PostedbyXenoGear
July 2, 2010

oh to be exact what im asking for is here the signal wire for the iat sensor and sry for double post

PostedbyXenoGear
July 2, 2010

Hello XenoGear.

The IAT on your Accord is located at the top-left rear of the intake manifold.

As per our records, it has two wires, (1) Green/Yellow and (2) Red/Yellow, where the first one is sensor ground and the second one is the IAT sensor output signal to the ecu (Red/Yellow).

Bellow is a drawing that might help locating the IAT.

Best regards,

Richard

2003 Honda Accord IAT sensor Location
PostedbyRichard
July 2, 2010

Thx that helped a lot

PostedbyXenogear

Thanks for reading!