MAP sensor wiring help PLEASE!

[thegenius46m]

I am using the Turner Harness and that is why I used the unoccupied Pin 16 for my MAP ground as opposed to de-pinning pin 17. Pin 17 provides ground to the MAF which in turn provides ground to the IAT when using the Tuner harness.

So MAP wiring for me was as follows:
pin 18 Signal
pin 16 Ground
pin 7 (spliced into existing wire) Power

I will be wiring the flap soon and off hand I don't know if the Turner deal will screw with the wiring I have done or not, I can't imagine it will. One other nice thing about the Turner harness with a CSL intake is you can simply cut off the extra unused MAF connector and splice there for whatever you need rather than having to pull wires to the DME.

Yup. This is exactly why I was one of the early adopters of the Turner harness when it came out. Hack the turner harness and not the oem wiring harness lol.

Ok so currently I appear to have the same Map wiring setup as you now, but noticed no change in output with the car off compared to having the map spliced into pin 17.

Looking at this diagram below, it appears pins 22 and 25 are power and ground on the dme side, which in turn connect to pins 1 and 2 (IAT functioning pins) on the MAF harness. Given that you normally would cut these out of the maf harness and tuck the rest away, I wonder now if pin 17 is actually causing the issue and needs to be unplugged and left out? May give it a try. Thought I read pin 17 is actually to power the MAF connector for a non-csl car?



I would like to have the ability to run the flap later on down the road, so curious what you come up with the turner harness in the equation.

[Cubieman]

...Also, for anyone running the Turner Harness plugged into the MAF sensor harness for the sake of not having to hack the oem harness, would you care to share your wiring? ...

I am using the Turner Harness and that is why I used the unoccupied Pin 16 for my MAP ground as opposed to de-pinning pin 17. Pin 17 provides ground to the MAF which in turn provides ground to the IAT when using the Tuner harness.

So MAP wiring for me was as follows:
pin 18 Signal
pin 16 Ground
pin 7 (spliced into existing wire) Power

I will be wiring the flap soon and off hand I don't know if the Turner deal will screw with the wiring I have done or not, I can't imagine it will. One other nice thing about the Turner harness with a CSL intake is you can simply cut off the extra unused MAF connector and splice there for whatever you need rather than having to pull wires to the DME.

[thegenius46m]

Is your graph also the same way as the others with the Kassel set up? If you look at everyone’s graph including mine it shows around 4.1 with engine off and around 1 bar,

Pretty much actually. 4V and 996mbar of pressure at ACC, around 1.5v and 2-3xx mbar of pressure at idle iirc. Looking to move the sensor to the booster area once the t tubes are available but any idea what's causing the voltage and pressure discrepancies?

[COVID-19]

Post # 2

http://www.cslregister.com/forum/showthread.php?t=14786

[COVID-19]

You da man! Lmk when you have these available as I'm local. Hard to believe I've been running the Kassel setup for almost 2yrs now and hard to believe I've had all these minor issues.


Also, for anyone running the Turner Harness plugged into the MAF sensor harness for the sake of not having to hack the oem harness, would you care to share your wiring? I'm going to dig into this further tomorrow, but I believe there may be a wiring issue with my setup as I'm only getting around 4V at ACC with pressure at 1bar, but at idle I believe I was getting close to 1.5v with almost double the map pressure ecuworx specifies.

Plan with the turner harness was to use the two iat wires on the maf connector and plug them into the turner harness but forgo the remaining terminals but I'm thinking something is going on here that is affecting the MAP sensor output.

Played around tonight and noticed on the MAP sensor wiring side I had the following:

Initial setup:
-Pin 18 plugged in from MAP
-Pin 17 spliced with MAP sensor ground and oem ground
-Pin 7 spliced with red/green on map and red/green oem pin

Next I tried unsplicing 17 and connecting the oem ground back to pin 17, then used the map sensor brown wire into pin 16. Surprisingly no change in readings on testo.

Lastly (and I knew this was a longshot of doing anything), swapped pins 16 and 17 in the harness and unsurprisingly got the same output of 4V DC and 997mbar pressure via testo with the car off like cubieman posted a few pages back.

I'll pull the snorkel tomorrow and check how the turner harness is integrated as it has been a while since I did this with a friend, but wanted to see if you all had any ideas as to what could be up with my wiring? It sounds like something is up with the turner harness, but I swear my IATs were good last time I checked? Hmm...

Is your graph also the same way as the others with the Kassel set up? If you look at everyone’s graph including mine it shows around 4.1 with engine off and around 1 bar,

[thegenius46m]

I ordered them a while back they been stuck there for almost 2 weeks. I just found someone local to 3D print them with a slight modification so it can fit a bit more flush.

You da man! Lmk when you have these available as I'm local. Hard to believe I've been running the Kassel setup for almost 2yrs now and hard to believe I've had all these minor issues.


Also, for anyone running the Turner Harness plugged into the MAF sensor harness for the sake of not having to hack the oem harness, would you care to share your wiring? I'm going to dig into this further tomorrow, but I believe there may be a wiring issue with my setup as I'm only getting around 4V at ACC with pressure at 1bar, but at idle I believe I was getting close to 1.5v with almost double the map pressure ecuworx specifies.

Plan with the turner harness was to use the two iat wires on the maf connector and plug them into the turner harness but forgo the remaining terminals but I'm thinking something is going on here that is affecting the MAP sensor output.

Played around tonight and noticed on the MAP sensor wiring side I had the following:

Initial setup:
-Pin 18 plugged in from MAP
-Pin 17 spliced with MAP sensor ground and oem ground
-Pin 7 spliced with red/green on map and red/green oem pin

Next I tried unsplicing 17 and connecting the oem ground back to pin 17, then used the map sensor brown wire into pin 16. Surprisingly no change in readings on testo.

Lastly (and I knew this was a longshot of doing anything), swapped pins 16 and 17 in the harness and unsurprisingly got the same output of 4V DC and 997mbar pressure via testo with the car off like cubieman posted a few pages back.

I'll pull the snorkel tomorrow and check how the turner harness is integrated as it has been a while since I did this with a friend, but wanted to see if you all had any ideas as to what could be up with my wiring? It sounds like something is up with the turner harness, but I swear my IATs were good last time I checked? Hmm...

[Cubieman]

Terra, just for the record, which MAP sensor are you using? Is this the same model as what comes with the Kassel adapter?



Cubie, when you did the back to back data collection between the Kassel adapter and the inline brake booster adapter, did you use the exact same MAP sensor? or did you have a second one? If you had a second, were the two you had the same exact model?

Just want to rule out any potential variables here...

I used the MAP sensor included with the Kassel "kit" in both tests as well as Kassel's wiring. So as far as the pre-made kits go I had it easy, the brake servo adapter put the sensor it the correct spot and the Kassel wiring made wiring stupid easy after I got over the fear factor of course. But I could have easily created the wiring, the parts are out there.

[Cubieman]

Test Sample

Nice man!

[duracellttu]

My pictures are of the OE CSL sensor with the OE CSL rail FWIW

Terra, just for the record, which MAP sensor are you using? Is this the same model as what comes with the Kassel adapter?

Its the physical location of the sensor making those patterns you are seeing. I did those 2 tests about 10 minutes apart and you could see a direct result when the sensor was moved from the throttle body (Kassel) location to the brake servo line location. But again nobody has said if there is anything inherently "bad" with the Kassel location, tons of people use it, they just aren't busting out the laptops with testo and viewing the data like we are.
I could not tell one but of difference driving the car with the sensor moved to a different location but thats NOT to say that it isn't affecting the DME in some way when it oscillates like that. That is something I do NOT know and would be curious to find out.

Cubie, when you did the back to back data collection between the Kassel adapter and the inline brake booster adapter, did you use the exact same MAP sensor? or did you have a second one? If you had a second, were the two you had the same exact model?

Just want to rule out any potential variables here...

[COVID-19]

Test Sample

[COVID-19]

So you bought the remaining stock of them? Lol.

And for anyone having issues with Testo prompting for COM port 9, just change the COM port requirement in the .ini file to use COM port 1 so you don't need to go into device manager each time you use a different app. That's what I did.

I ordered them a while back they been stuck there for almost 2 weeks. I just found someone local to 3D print them with a slight modification so it can fit a bit more flush.

[thegenius46m]

12mm but most packages are stuck in the UK. (Even from Ebay vendors) Last order I got was from an eBay vendor with expedited shipping and the price was a bit too expensive.

So you bought the remaining stock of them? Lol.

And for anyone having issues with Testo prompting for COM port 9, just change the COM port requirement in the .ini file to use COM port 1 so you don't need to go into device manager each time you use a different app. That's what I did.

[Cubieman]

Its the physical location of the sensor making those patterns you are seeing. I did those 2 tests about 10 minutes apart and you could see a direct result when the sensor was moved from the throttle body (Kassel) location to the brake servo line location. But again nobody has said if there is anything inherently "bad" with the Kassel location, tons of people use it, they just aren't busting out the laptops with testo and viewing the data like we are.
I could not tell one but of difference driving the car with the sensor moved to a different location but thats NOT to say that it isn't affecting the DME in some way when it oscillates like that. That is something I do NOT know and would be curious to find out.

[duracellttu]

My refresh rate is set at 10Hz (default).

I'll go back and check again with 10Hz setting, but it didnt make a difference when I was toggling between realtime and 50Hz.

[Cubieman]

My refresh rate is set at 10Hz (default).