I think I found how to wire a MAP into a Coyote PCM

[Artorias]

Did some searching around and comparing the wiring diagrams/connector pinouts of a 2015 F150 w/ Coyote and a 2015 Mustang w/ Coyote. Found it intriguing that the Mustang is MAF and the F150 is MAP, but it's the same engine (to an extent)

So maybe someone can help finish connecting the dots here before I order a Bosch 3 bar and blast a hole in my 2018 GT manifold. Here are some photos:


F150 Pinout:
f150.png

Mustang Pinout:
mustang 1.png
mustang2.png


Here is a photo of the Bosch pinout with which I believe is the correct pinning to a Mustang PCM:
bosch.png


The F150 C1381E connector of the PCM uses pin 27 for IAT, 29 for signal return, 32 for manifold pressure, 34 for voltage reference. The Mustang PCM connector C175E uses the same pin 27 for IAT, 29 is unused, 32 is unused, 34 is the same voltage reference. However, the Mustang has signal return on pin 49 instead of 29 like the F150. I don't think this would effectively matter if signal return went to pin 49 instead of 29, but maybe someone knows something I don't.

So in theory, if we turn on the MAP Sensor option in the calibration of a 2015-2017 Mustang GT, the unused pin 32 would turn on and accept input from a MAP sensor. Could even cut IAT from the MAF and reroute it to a MAP capable of IAT, like the Bosch 4 wire sensors. So everything goes in the same exact spot as the F150 except signal return potentially going to pin 49.


Anyone gotten this far and tried this? I don't see why this wouldn't work given that the stock OS for a 15-17 GT has an option to turn on a MAP even though no 15-17s came with MAP, and coincidentally pin 32 for the Coyote F150's MAP input is unused for the Mustang. If I don't get any responses I'll probably just order a MAP w/ IAT and pin it in just to see if the scanner actually gets a reading to the "Manifold Absolute Pressure" PID. I don't even know what it'll say given the voltage scaling of different bar range sensors and how the PCM will translate the reported voltage to pressure.

I'm also unsure if the Mustang would even do anything with the information being told it's fitted with a MAP sensor. Would it just report the information and leave it at that or do we think it'll actually do something with the new sensory information? On top of that, what about the barometric reading? Should the barometric sensor option also be enabled since barometric can be read via a MAP? Lots of possibilities if this works.

[Rob@HPTuners]

Your ECU should already be fitted with a barometric pressure sensor. They are typically internal which is why you won't find them on the pinout.

I can't say whether or not you'll get a sensor reading, but my suspicion is no. If you do, it would take some additional work before you could actually make use of it for something like a fueling model. Moreover, if the goal was to make a centrifugal or turbo setup work better, this wouldn't do too much to help.

[Artorias]

I can't say whether or not you'll get a sensor reading, but my suspicion is no. If you do, it would take some additional work before you could actually make use of it for something like a fueling model. Moreover, if the goal was to make a centrifugal or turbo setup work better, this wouldn't do too much to help.

At the very least, I like the idea of having a MAP input even if the PCM isn't doing anything with the information beyond just reporting it through the existing Manifold Absolute Pressure PID. Having the information, even if it's not applying corrections in real time, is still very useful for manual adjustments in speed density and other areas. It's nice to get closer to perfect. And nice not hijacking another sensor for input like the AC pressure switch. I'm already stealing that for fuel pressure.

My suspicion is that it gets a reading through pin 32, but it would be inaccurate and very dependent on the voltage scaling/pressure range of the chosen sensor (2bar, 2.5bar, 3bar, etc. based within 0.5-4.5v) if it reports in actual pressure and not just raw voltage of the sensor. I'm hoping for raw voltage so we can manually scale and translate it but I don't think that's going to happen.

Your ECU should already be fitted with a barometric pressure sensor. They are typically internal which is why you won't find them on the pinout.

Regarding baro, I'm under the impression there is no baro sensor at all and it's not internal to the PCM. I'm fairly certain baro is inferred via throttle body model and calculated airmass from MAF unless I'm wrong and there truly is a sensor. Then if there is a sensor, that begs the question of why stock calibrations have the barometric sensor as "not fitted" instead of fitted.

baro.png

[murfie]

Probablly the same cost as a MAP sensor. Garanteed to work. Polling rate will be way faster than OBDii data.

https://www.hptuners.com/product/pro...set-for-mpvi2/

PROLINK FOR mpvi2

https://www.hptuners.com/product/pro_link/

PROLINK for mpvi2+ and MPVI3

https://www.hptuners.com/product/pro-link-plus/

[SiriusC1024]

$250 for pro feature set. Might as well get the MPVI3 if you have the 2 or 2+. The 3 comes with it.

This is the sensor I'd go with. Has both IAT and MAP in the same sensor. Very useful for boost situations because the measurements are taken in the manifold. Various boost levels available. Check Associated Parts tab.
https://www.bmotorsports.com/shop/pr...oducts_id/1720

[veeefour]

Your PCM has no MAP logic - switch path in code leads to nowhere. It wont work.

There is no baro in that PCM either, baro is inferred in this model.

[Rob@HPTuners]

Regarding baro, I'm under the impression there is no baro sensor at all and it's not internal to the PCM. I'm fairly certain baro is inferred via throttle body model and calculated airmass from MAF unless I'm wrong and there truly is a sensor. Then if there is a sensor, that begs the question of why stock calibrations have the barometric sensor as "not fitted" instead of fitted.

On this ECU, I think you're correct. This isn't the case universally on all MAF based Ford ECU's. On some, that switch is set to "fitted", which was confusing considering the wiring diagram showed nothing. Cracking the ECU open and observing the PCB revealed a surface mounted sensor.

[veeefour]

On this ECU, I think you're correct. This isn't the case universally on all MAF based Ford ECU's. On some, that switch is set to "fitted", which was confusing considering the wiring diagram showed nothing. Cracking the ECU open and observing the PCB revealed a surface mounted sensor.

In +2018 Fords for example Mustang, there is no baro inside PCM either even tho the switch is set to enable, baro is send though CAN by another module.
Never seen any 298 or 1799 with baro inside the PCM - got any pic?

[Rob@HPTuners]

Baro.jpg

This is either a 1767 or 1797, I cannot remember

[veeefour]

Baro.jpg

This is either a 1767 or 1797, I cannot remember

Cool, not to be found on the ones Ive taken apart. Funny this is how its going to perform in encapsulated case.

[Seishuku]

The control modules have a vent that allows a controlled amount of breathing, that's that black button thingy on the outside of the case.
Beside allowing pressure equalization for baro measurement, it's also a gas pressure release incase a capacitor or chip decides to let the magic smoke out, so the module doesn't blow up like a balloon.

[veeefour]

The control modules have a vent that allows a controlled amount of breathing, that's that black button thingy on the outside of the case.
Beside allowing pressure equalization for baro measurement, it's also a gas pressure release incase a capacitor or chip decides to let the magic smoke out, so the module doesn't blow up like a balloon.

Well yes I know that but this vent wont fix the pressure problem entirely. You will still have to infer some parameters to compensate the temp etc.
This feature is like a safety valve in case what you mentioned but really helping the baro inside to not have any fluctuactions.

In any case baro sensors inside - maybe 20-30% of existing PCMs now days. Some of them will use external sensor like 2016 Camaro.
TC1799 can use external baro as some Whipple calibrations does GT350 for example.

[Davem3261]

I have a temporary map sensor on my GT350. I used a 2020 GT500 map sensor. I unplugged the ac pressure sensor and made a temporary harness to plug into that. User defined math to turn the voltage from the AC pressure sensor input into MAP. I then verified that its accurate by plugging my temporary harness into my wifes explorer ST.

[radcartuning]

I have a temporary map sensor on my GT350. I used a 2020 GT500 map sensor. I unplugged the ac pressure sensor and made a temporary harness to plug into that. User defined math to turn the voltage from the AC pressure sensor input into MAP. I then verified that its accurate by plugging my temporary harness into my wifes explorer ST.

Quick question... where are you are all tee'ing in the map sensor? On one of the vacuum lines just past the tb on the intake?

I am trying to get my innovate map to work on the ac pressure sensor, but no luck so far...

[Davem3261]

Quick question... where are you are all tee'ing in the map sensor? On one of the vacuum lines just past the tb on the intake?

I am trying to get my innovate map to work on the ac pressure sensor, but no luck so far...

I get my reference from the supercharger lid. I added a tee off of the boost reference port to my fuel pressure regulator.

[tae715]

Any update to this? I see Rob shoemaker has a kit to do MAP sensor conversion on the gen 3 mustangs but has anyone figured out how to get MAP on gen 2s yet?