# GM MAT sensor spec - free custom title
**URL:** https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137
**Category:** NYSpeed Automotive
**Created:** [June 17, 2008, 10:00am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137 "2008-06-17T10:00:30Z")
**Posts on this page:** 20
**Page:** 2
### Author:  [@justa4door](https://forums.speedlife.net/u/justa4door)
#### Post date: [June 17, 2008, 11:56am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/21 "2008-06-17T11:56:27Z")
im getting there i have 1/2 a paper so far
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### Author:  [@justa4door](https://forums.speedlife.net/u/justa4door)
#### Post date: [June 17, 2008, 11:58am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/22 "2008-06-17T11:58:38Z")
5v in 43k r = .581 (w) and .116 (I)
2 min edit :
w= e2/r
w=5 (2) /43k
w= .5841
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### Author:  [@justa4door](https://forums.speedlife.net/u/justa4door)
#### Post date: [June 17, 2008, 12:03pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/23 "2008-06-17T12:03:05Z")
i would need more time … i have not done this in like 3 years
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### Author:  [@Fry](https://forums.speedlife.net/u/Fry)
#### Post date: [June 17, 2008, 12:03pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/24 "2008-06-17T12:03:24Z")
You’re off by a factor of 1000 😛
Not enough info to solve. Fuzzy’s on the right track by getting another value.
justa4door you’re, um, somewhere in left field if you’ve got half a paper for (V1/R1)=(V2/R2)
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 17, 2008, 12:16pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/25 "2008-06-17T12:16:08Z")
> [@Fry](#):
>
> Not enough info to solve. Fuzzy’s on the right track by getting another value.
I know there is a value missing to calc the output… but I can’t remember what it would be. ☹
Its pretty academic at this point anyways. 🙂
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### Author:  [@Bacon](https://forums.speedlife.net/u/Bacon)
#### Post date: [June 17, 2008, 12:24pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/26 "2008-06-17T12:24:33Z")
Okay, I’m come up with at least some method of getting where we need to be I think.
R1 = MAT/IAT
R2 = Load at ECU
IT = Total load
VI = Input voltage (In this case 5)
VE = Voltage at ECU
IT (Amperage) = VI / (R1 + R2)
VE = VI - (R1 + IT)
The problem is we don’t know the value of R2.
To do that you will need to hook an ammeter up to determine the current load. Once you know the resistance of the MAT and current you can then find R2 by the following
R2 = (VI/IT) - R1
Cliffs: Hook an ammeter up in series, get a value with the key on engine off. Then get the resistance of the MAT at the same temp. You can use that to find the load at the ECU or at least close to it.
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### Author:  [@justa4door](https://forums.speedlife.net/u/justa4door)
#### Post date: [June 17, 2008, 12:30pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/27 "2008-06-17T12:30:22Z")
home run…:gotme:
i dont know where i was going
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 17, 2008, 12:34pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/28 "2008-06-17T12:34:55Z")
clamp ammeter suffice?
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### Author:  [@Bacon](https://forums.speedlife.net/u/Bacon)
#### Post date: [June 17, 2008, 12:36pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/29 "2008-06-17T12:36:51Z")
As long as it’s reasonably accurate, the more so the better.
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 17, 2008, 12:41pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/30 "2008-06-17T12:41:01Z")
should be, fluke, only like 3 yrs old.
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### Author:  [@psychopjv](https://forums.speedlife.net/u/psychopjv)
#### Post date: [June 17, 2008, 2:27pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/31 "2008-06-17T14:27:01Z")
if it’s reading -40 the sensor is doing anything. thats it’s default.
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 17, 2008, 2:40pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/32 "2008-06-17T14:40:09Z")
yea, i fingered it out on the app specific site.
> [@Nikuk](#):
>
> Its pretty academic at this point anyways.
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### Author:  [@psychopjv](https://forums.speedlife.net/u/psychopjv)
#### Post date: [June 18, 2008, 10:08am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/33 "2008-06-18T10:08:15Z")
saved by the bell. whee another ford running.
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 18, 2008, 10:59am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/34 "2008-06-18T10:59:33Z")
Saved by the Pat, FTW.
Burnouts, coming soon to a lawn near you.
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### Author:  [@Anonymity](https://forums.speedlife.net/u/Anonymity)
#### Post date: [June 18, 2008, 11:01am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/35 "2008-06-18T11:01:32Z")
> [@Nikuk](#):
>
> Saved by the Pat, FTW.
>
> Burnouts, coming soon to a lawn near you.
dont do burn outs… something will break.
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 18, 2008, 11:46am UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/36 "2008-06-18T11:46:09Z")
lol. chain drive FTL.
Besides, aren’t you selling that nice concrete driveway anyways? :naughty:
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### Author:  [@psychopjv](https://forums.speedlife.net/u/psychopjv)
#### Post date: [June 18, 2008, 2:04pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/37 "2008-06-18T14:04:10Z")
where’s my custom title!!! teehee…
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [June 18, 2008, 2:09pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/38 "2008-06-18T14:09:49Z")
:thankyou:
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### Author:  [@psychopjv](https://forums.speedlife.net/u/psychopjv)
#### Post date: [June 18, 2008, 2:31pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/39 "2008-06-18T14:31:00Z")
> [@Nikuk](#):
>
> :thankyou:
teeheeeeee. i like it.
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### Author:  [@Firehawk853](https://forums.speedlife.net/u/Firehawk853)
#### Post date: [June 18, 2008, 8:28pm UTC](https://forums.speedlife.net/t/gm-mat-sensor-spec-free-custom-title/50137/40 "2008-06-18T20:28:01Z")
Can’t you calibrate the stock sensors under MS-I? I know you can in MS-II. If not I have the Ford bias resistors at the shop and a soldering iron ready
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