1.6 Ms3 Pinout to Break out Box
 

Hey guys. I have another thread going but got another answer on stuff. I started working on fixing the break out board. I have a MS3 but it has the MS3x expansion board. The idea is to not use the Ms3x expansion board unless I need to. Trying to clean up the wiring. I have a the 76 pin break out box. MS3 is a v3.57 unit.

I am looking at this wiring diagram for the MS3 DB37 Connector.

https://www.diyautotune.com/product/...l_1436_3&pid=1

I am using this for the 1.6 Miata ecu pinout

https://www.miata.net/garage/ECU%20P...90-93%20MT.pdf

My questions now are I need to wire in the CAS and TPS. Been following the ms3 wiring harness from the db37 connector for just the MS3 not the expansion card. Connector one with 22 pins goes to the same Connector one on the break out board. Connector two is a 26 pin which is connector four on the break out board. So going to reference connector two from the 1.6 as connector four.

So the shielded twisted pair of wires. Got white and black. Plus a grey 5v wire, for the CAS. From the ecu pinout there are pins 4E and 4G. However on the pinout they both say 5v. The ms3 has stuff for the crank sensor on the shielded twisted pair of white and black wire. It is also showing maybe sending a 5v reference from a grey wire. Miata is a VR style sensor. How would you wire this out to the break out box.

Next up I am looking at the TPS Wiring. We are going to be doing a BMW TPS.
Stock Pinouts are 1N for the Idle Sense and 2L/4L for the WOT sense. On the ms3 harness there is a Light Blue wire going to the tps but also a grey sense wire. Which ones need to go where.

Also on the stepper motor. Should I use the Light Green wire for the PWM Idle Valve or L/W 1A wire coming out of the MS3 Harness.

Do I need to do anything for the Igniter terminal B on spot 1G and Igniter Teminal G on 1H.

I have the injectors(Batch fire so just using one of the two available wires), coolant temp, ignition output, oxygen sensor, and the fuel pump relay figured out.

I am also curious on coolant relay or will the stock wiring take care of that with the sensor at the front of the engine. Or is pin 1R for when the AC would came on.

I made up a spreadsheet tonight if y'all could take a look at it. I color coded stuff so it would be easier to match things. I do have a lot of questions by the look of it.

https://docs.google.com/spreadsheets...it?usp=sharing

Didn't totally follow all of what you're trying to do, or why you don't want to use MS3x. All I have to add is, why not just go to trubokitty.com and follow the guide there?

Well was trying to keep it simple. But had not found tubrokitty website when hunting the other night. Going to start back over and use the expansion card. That link is what I needed. Thanks a ton.