1G Megasquirted GSX, IAC/ISC wiring Q's

[artsvetkov]

I know this is a wrong forum, but due to my user "limitations" I can't post in Tunning/Tech section.

I have 91 GSX auto with 16g and other small goodies that I run on MSII spark and Fuel, I would like to wire up IAC/ISC to megasquirt because it is my daily driver and it stalls due to weather/temp change with no proper IAC. Has anyone ran IAC of a Megasquirt, if so, I noticed there are 6 wires in DSM schematics, but MS only needs 4, which one's do I hook up? Any input if I should run IAC and PW or always on?

If it wasn't for automatic, I wouldn't bother


Thanks!

 

[Lofty]

Im not familiar with MS but what do the four wires for it supposed to do/sense? If you tell us that im sure I can figure it out for you.

Here you go
http://www.megamanual.com/ms2/IAC.htm

 

[artsvetkov]

There should be 2 coils inside of IAC, 2 wires per coil to change polarity, but wiring diagram shows extra 2 hot wires(Now that I think, 2 wires per coil is 2 possible ground paths). It would of been just nice if anyone has done it before so I dont have to pioneer the way If i get enough tech posts by the time I figure it out, I will post write up.

Looks like what I/we got is Unipollar stepper motor, It doesn't say exactly to to wire it, but I assume it's like Bipolar one without H-bridge. I will try to email Matt at DIYautotune and see if he got any input on it. I also need to know # of steps open to close.

 

[ramsack]

There are two coils in our IAC. They have two coils with taps in the middle. You would just ignore the middle two pins.

 

[Lofty]

Your avatar oh man! Good info ramsack!

Id assume you have enough info to figure this out now!

 

[ramsack]

The tires in the picture were once on the DSM I owned. And there is a spare tire cover on top. It made for a decent seat. I get my license back more than a year from, now. Needless to say I will probably just get a car and not even bother with licensing ever again.