I know the feeling.

It shows .70

I think that could be a short. I would email diy autotune. Do you have a soldering iron? Where are you located?

I have a soldering iron but not a very steady hand, and I'm over in SC.

I was reading on msextra and DIY said the right leg should be 5v and the left should be 12v.
Megasquirt Support Forum (MSEXTRA) • board voltage wrong (View topic)
3rd post down

Yeah that could be right I'm going off memory. But either way you weren't getting voltage there right?

No sir.

Yeah, u5 could be shot. or it could be something on the way to u5. Either way someone else knows more than me.

Nothing looks burnt, nothing looks jointed except for these two.

Attachment 235239

q23 and q22

Also q2 and q19 look the same. The solder is touching on these.

did I build this ms?

The guy I bought it from said you did.

https://www.miataturbo.net/miata-par...9/#post1169300

i didnt read the thread, i just saw that last pic. looks like it's mine.

im going to assume harv did something to the MS and why he sold it...

Any suggestions?

have you installed the vTPS yet? if not, did you unplug the stock tps switch? if not, do that.

Yeah the VTPS is installed already.

Wait wait wait....

The MS3x uses the same ground as the stock ecu right? I think I just figured it out.....

I'm going to shoot myself in the foot, brb.

it grounds directly through the oem harness. unplug the vTPS if you didnt figure it out. if wired wrong that will introduce a 5v fault to ground and the MS wont connect and have power just like youre seeing.

I think my problem is I have the ground unhooked on the back of the head.

If this isn't it I will try to unplug the vtps.

Fuck me. It was the ground.

Here is the tune that's loaded on the ms3x. You think this would be OK to try and start my '92?
550cc injectors
greddy turbo
no afm
no cat

Ok so let this rest for a week. I apologize for my stupidity, something so simple.

Anyways, I need to know where on the AFM connector I need to push these two wires in for the GM IAT sensor, and on a MS3x, do I need to worry about the fuel pump not coming on? Or do I need to do something with that circuit as well?