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Old 04-08-2016, 01:22 PM   #1
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Default MS noob, vtps help!

So I just got my first Miata in Nov-ish, and I have picked up a diy megasquirt ms2extra, and Ive been doing a bunch of research so I can install it on a weekend day without any serious issues coming up.

So its been about two weeks since I picked up the ecu, its got a sequential injection board on there, and Ive looked over what to do so many times Im sure I could do it in my sleep at this point. My only other issue is setting up the tps. I found a vtps throttle body from a 90-93 1.6 automatic, and this is another toy I want to throw on when I do the ecu install. I have looked through all of the megasquirt sticky threads, diyautotune, miata forums, mx5 nutz, tampa bay miatas, google, and anywhere else I could find.

Ive come to the conclusion that one of the wires under the hood on the vtps wont be used, okay understood. And I need to remove R6 and R7 and then run jumpers from 22, an 26 to 1N and 2L. That is pretty damn clear, no problems there.

The problem I am having, however, is that because I didnt build this ecu, I have no idea where the hell pins 22 and 26 are...... The previous owner said he had a vtps wired on, and I can see where he had it soldered before and taken them back out. They are in the proto area next to the injs 3&4 board. Is this what I should be looking at? If not, where are pins 22&26 located on the board?

Im sure words would help me find it, but maybe someone could take a picture for me so I know exactly where?

Im at work so I cant take a pic of my board, and Im not sure what numbers are on the board except n76, which I understand is a 76 pin board.... This is my first time ever playing around with an ecu, usually Im under the hood. Any help will definitely be appreciated!!
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Old 04-08-2016, 01:46 PM   #2
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Originally Posted by Miatainthehills View Post

Ive come to the conclusion that one of the wires under the hood on the vtps wont be used, okay understood. And I need to remove R6 and R7 and then run jumpers from 22, an 26 to 1N and 2L. That is pretty damn clear, no problems there.

??????????????????????


what makes you think you need to do this?
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Old 04-08-2016, 02:01 PM   #3
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From Joe Perez (and numerous other places on the interwebs) under ECU and Tuning>Megasquirt>SUPER important megasquirt threads>How to wire analog TPS to 90-93 car:

At the Megasquirt, connect pin 26 (Vref) to the green / white wire at position 2L of the ECU harness, and connect pin 22 (TPS) to the red wire at position 1N of the ECU harness.
[....]
If you are using the TPS from a '90-'93 automatic car, the wiring at the MS is the same, and the wiring at the TPS is as follows: The red / black wire of the TPS goes to the red wire of the car. The green / red wire of the TPS goes to the green / white wire of the car, and the black / green wire of the TPS goes to the black / green wire of the car.

If I have been misled and I dont need to do this, all the better. Like I said, I dont normally mess with ECUs, but I am willing to make mistakes to learn....

The guy I bought the Megasquirt from said you helped him out a lot, Brain...
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