Jitwontee

Hello so i am having a hard time calibrating my tps on my nb2 swapped 1991 na. The car has a 91 auto harness and im using a throttle body from a 99. I put a new tps sensor in yesterday thinking it would fix it but i was wrong i have wiring diagrams from a 1991 auto and the 99 diagram. I am almost 100% sure it is wired correctly i have the light green n red to light green n red, i have the green black to the red black, and i have the black red to the black light green. When i go to calibrate it on the ms it reads 56 closed and when i open the throttle nothing changes so 56 again. Am i missing something here or have it wired wrong?? Im at a loss i have been searching this problem for about a month since i got the ecu. The car starts and idles fine but thats all it can do because the ecu see no throttle change. PLEASE HELP!! thank you

Jitwontee

So this means i have one wire from my harness not used which is the solid red wire. This wire has 5v while every other wire has nothing is that a problem?

Matt Cramer

No VREF, no signal.

Jitwontee

so i need to figure out were that red wire goes?

hustler

iTrader: (6)

Jitwontee

just tryed that and it didnt work

hustler

iTrader: (6)

****, sorry, I've been jacking with this problem, forgot that a belt shredded that wiring. I just went outside to verify and when plugged-in the 1.6 wires from top to bottom should be:
mint/white
black/green
mint/red

Just verified and the computer has signal. You'll know when you get it right because the fuel pump will prime as well.

Jitwontee

See i dont have a mint white because it is a auto harness which orginally used 4 wires. The fuel pump primes no matter on my car even with no signal
the colors i have are
Red/black
red
Mint/red
Black/green

Jitwontee

Bump any input is greatly apprichated could it be a problem with the ecu?

Ted75zcar

iTrader: (2)

The wiper on the AT '91 goes to pin 2M. AFAIK most traditional MS configurations use 2L (MT configuration)

edit: there are other differences as well. As Matt mentioned, at least one of the connected wires should have ~5V KOEO, another should measure ~0 ohms to ground.

Jitwontee

the ms i have is a diy unit from braieack on the forum. It their a why i could trick it or how would i fix that?

Ted75zcar

iTrader: (2)

Well, if he configured it for a MT, and the AT pins are not connected, you can fly wire the pins inside the case.

if you bought it from him, I would contact him for his advice.

Jitwontee

i told him mutiple times that its a auto harness. He hasn't contacted me back in over a month which is very frustrating and im not really sure how too tell

Ted75zcar

iTrader: (2)

Connect red (1N) to lt grn/red
connect blk/red to blk lt grn
connect red-blk to grn blk

move pin in ecu harness from 2m to 2L, or solder a wire between 2M and 2L inside the box.

proceed at your own risk...

Ted75zcar

iTrader: (2)

You could tenporarily short 1n to 2L, confirm that the tps reading in TS rails

Jitwontee

Do you have a diagram of the connector pins i should be looking at? Never delt with this kinda stuff

Ted75zcar

iTrader: (2)

Megasquirt Support Forum (MSEXTRA) ? MS3X Miata (View topic)

this is available in a lot of places, I bet it is here in a sticky as well

Jitwontee

Ok thanks ill try to figure this out tomorrow

Jitwontee

thank you soooo much for your help.

It has been confirmed braineack FINALLY responded and he wired the ecu wrong

Ted75zcar

iTrader: (2)

right on, glad you got it figured out.