MAP Temperature high

downside190 · Post by **downside190** » Thu Apr 02, 2015 12:31 pm

Hi,

I'm using the 2.2 m1 extra board and have wired it up to use a maf sensor, when I connect it to tunerstudio I get a reading but it says the temperature is 75 degrees Celsius. I live in the uk and its April so this is clearly not the case.

Do I need to change any settings in tunerstudio to get the correct reading or is this actually correct?

Post by **jsmcortina** » Thu Apr 02, 2015 3:00 pm

MAF, MAT or MAP ? I'm a little confused by your question.

What do you have wired where and what settings are you using?

James

downside190 · Post by **downside190** » Fri Apr 03, 2015 1:26 am

jsmcortina wrote:MAF, MAT or MAP ? I'm a little confused by your question.

What do you have wired where and what settings are you using?

James

I wired up a maf as perinstruction here http://www.msextra.com/doc/ms1extra/MS_ ... al.htm#maf but in Tunerstudio the manifold air temperature is showing as 75 degrees Celsius. So not sure if this is correct.

In tunerstudio under advanced code options i've set Maf airflow to afm on x7 with air density correction built into afm. In project properties i've set the sensor to narrow band (as this is what it is) and fueling algorithms to air flow meter. Map sensor is set to mpx4115 -115kpa, ms v101 (this was defualt so haven't changed it).

2swe · Post by **2swe** » Fri Apr 03, 2015 2:32 am

so you have MAT sensor buid in MAF..

you need correct airdentfactor.inc and matfactor.inc files for your MAT sensor, either from someone who uses the same sensor, or you can create those files using EasyTemp, or you can edit those files manually.

downside190 · Post by **downside190** » Fri Apr 03, 2015 3:57 am

2swe wrote:so you have MAT sensor buid in MAF..

you need correct airdentfactor.inc and matfactor.inc files for your MAT sensor, either from someone who uses the same sensor, or you can create those files using EasyTemp, or you can edit those files manually.

Well the sensor in the car is a 230k kompressor one but I also have one from an Audi A3 thats used in a lot of VW's which I can swap in. I've downloaded easytherm (couldn't find easytemp but easytherm sounds like it does the same thing).

It seems quite complicated to configure is there tutorials other than the one on he spitfireEFI website?

Post by **jsmcortina** » Fri Apr 03, 2015 4:50 am

Unfortunately "EasyTherm" is not so easy... (it is easier than the previous historical method where you had to work out the numbers by hand and recompile the firmware.) I've used it once or twice long ago, but have forgotten what you have to do.

That's one of a number of areas where MS2 is superior. Decent sensor calibration in the tuning software.

One workaround option would be to use a standard GM calibration air temp sensor in addition.

James

2swe · Post by **2swe** » Fri Apr 03, 2015 10:19 am

sorry for confusing you, EasyTherm is the right name

I've used easytherm few times long ago, but I still remember something..

you have to measure the MAT and CLT sensor resistance at 3 different tepmeratures, fill the measured ressistance and corresponding temperature into easytherm, and click "write .inc and S19 files" button.

easytherm will create 3 .inc files (thermfactor - CLT,matfactor - MAT and airdentfactor - IAT correction), those files should be in "firmware dir/src" directory. and it will also create new msns-extra.S19

run TunerStudio, save you current MSQ, close TS, run download-firmware.bat it will load new *.S19 into MS, run TS burn your saved MSQ..

downside190 · Post by **downside190** » Fri Apr 03, 2015 1:42 pm

2swe wrote:sorry for confusing you, EasyTherm is the right name

I've used easytherm few times long ago, but I still remember something..

you have to measure the MAT and CLT sensor resistance at 3 different tepmeratures, fill the measured ressistance and corresponding temperature into easytherm, and click "write .inc and S19 files" button.

easytherm will create 3 .inc files (thermfactor - CLT,matfactor - MAT and airdentfactor - IAT correction), those files should be in "firmware dir/src" directory. and it will also create new msns-extra.S19

run TunerStudio, save you current MSQ, close TS, run download-firmware.bat it will load new *.S19 into MS, run TS burn your saved MSQ..

Thanks i''ll attempt this tomorrow, hopefully it won't be as hard is at seems. Just one question, how do you measure the resistance of the MAF? A google search isn't throwing up much helpful information.

Post by **jsmcortina** » Fri Apr 03, 2015 2:47 pm

What MAF is this?

Some MAFs have just a mass-air-flow sensor, others have an air temperature sensor also.

What wiring diagram do you have for the MAF? Please post it.

James

downside190 · Post by **downside190** » Fri Apr 03, 2015 3:19 pm

jsmcortina wrote:What MAF is this?

Some MAFs have just a mass-air-flow sensor, others have an air temperature sensor also.

What wiring diagram do you have for the MAF? Please post it.

James

Its one with an air temp sensor built in. I don't have full wiring instructions but know what each pin on the sensor does which is:

Pin 1 - air temp sensor
Pin 2 - 12v live
Pin 3 - ground
Pin 4 - 5v
Pin 5 - maf signal

I've then wired it up to megasquirt as per the link in my 2nd post

Post by **jsmcortina** » Fri Apr 03, 2015 4:09 pm

The air temp sensor will almost certainly be connected to ground internally. So to do the temperature calibration, measure the resistance between "air temp sensor" and "ground" with the MAF unplugged.

Are you sure that the sensor has 5V AND 12V ?

The ones with pinouts in the MS2 manual don't. http://www.msextra.com/doc/pdf/html/MS2 ... e-3.3.html

James

downside190 · Post by **downside190** » Fri Apr 03, 2015 11:59 pm

jsmcortina wrote:The air temp sensor will almost certainly be connected to ground internally. So to do the temperature calibration, measure the resistance between "air temp sensor" and "ground" with the MAF unplugged.

Are you sure that the sensor has 5V AND 12V ?

The ones with pinouts in the MS2 manual don't. http://www.msextra.com/doc/pdf/html/MS2 ... e-3.3.html

James

All the instrutctions I could find had 12v and 5v but this is a 5 pin narrowband maf sensor. All the ones I could find relating to Megasquirt are all 4 pin. I also have this maf as a spare if it helps http://www.ebay.co.uk/itm/171148119279? ... EBIDX%3AIT

Edit: Just to add when I plug in the maf I got as a spare the temperature reading is 10 degrees lower than the one currently in car.

downside190 · Post by **downside190** » Sat Apr 04, 2015 4:40 am

Ok I've tried easytherm route but measuring the resistance on the sensor is proving difficult, I can only getting readings at room temperature and as soon I as try to measure it at 0 degrees or there about I get no reading at all from the sensor. I made sure the multimeter was set Ohms and tried changing it to various different ranges but still only get readings at room temp.

Is there a GM sensor I could buy that would be easier to set up and fit the same sort slot as the one I'm using? The one I have fits a slot like this http://imgur.com/qGgkzhi

downside190 · Post by **downside190** » Sun Apr 05, 2015 10:19 am

Bump

Can anyone recommend a gm sensor thats easy to find in the UK?

downside190 · Post by **downside190** » Tue Apr 07, 2015 5:50 am

In case anyone finds this thread during a search, I gave up on the MAF sensor route and have bought a MAP sensor, hopefully I can get it to run properly this way instead of messing around with complicated a MAF

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