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Old 01-14-2014, 10:07 AM   #1
Ds1
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Default How to wire MS3X with Automatic Throttle Body VTPS?

Looking through Brain's instructions it seems they are a little out of date or something. I'm trying to wire the 90-93 VTPS up to a brain-built MS3X. I saw this thread but his wiring never worked and didn't have closure on it. Whats the right wiring? https://www.miataturbo.net/engine-pe...le-body-65547/

Also, I don't have the 4 pin connector and pigtail on my TB. I can make one no problem, but all the threads I have seen talk about the color of the wiring instead of "pin 1/pin 2/pin 3/pin 4" sort of thing.

Thanks!
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Old 03-28-2014, 12:28 AM   #2
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Bump?
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Old 03-28-2014, 08:46 AM   #3
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Quote:
Originally Posted by Ds1 View Post
Also, I don't have the 4 pin connector and pigtail on my TB. I can make one no problem, but all the threads I have seen talk about the color of the wiring instead of "pin 1/pin 2/pin 3/pin 4" sort of thing.

Thanks!
i just went and downloaded the 92 service manual.

inside, I found page 1104 which shows the wiring diagram for the TPS, both manual and auto as well as a diagram of their pinouts.

My document which tells you: B/LG is ground, R is 5v, and LG/W is TPS

So applying that knowledge, we can assume that we should wire the automatic TPS like this:

pin 1 - 5v
pin 2 - TPS
pin 3 - unused
pin 4 - Ground

IIRC pin 4 is the bottom pin.

Last edited by Braineack; 03-28-2014 at 08:57 AM.
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Old 03-28-2014, 01:32 PM   #4
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Now THATS what I needed. Thank you, sir, you're a life saver once again!
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Old 04-23-2014, 12:51 AM   #5
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Just to follow up, I did this install today and it COMPLETELY solved all my idle issues (hunting, oscillation, etc when warm but not when cold). This is a 1.6 running MS3X and "expanded" Greddy turbo.
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Old 04-23-2014, 08:42 AM   #6
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tuning will fix the rest.
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Old 03-03-2017, 01:34 PM   #7
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Quote:
Originally Posted by Braineack View Post
i just went and downloaded the 92 service manual.

inside, I found page 1104 which shows the wiring diagram for the TPS, both manual and auto as well as a diagram of their pinouts.

My document which tells you: B/LG is ground, R is 5v, and LG/W is TPS

So applying that knowledge, we can assume that we should wire the automatic TPS like this:

pin 1 - 5v
pin 2 - TPS
pin 3 - unused
pin 4 - Ground

IIRC pin 4 is the bottom pin.

This saved my life... Thanks!
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