* Sigh*
Where to even start with this.
Considering that this thread was two pages back, one might be tempted to think I haven't been doing anything.
Nothing could be farther from the truth....I've probably spent 30+ hours trying to figure out how to get what I want to happen with my ecu.
Well,.......What is it that you want your ecu to do Mike?
I want the damn thing to turn on my cooling fan,...AND my water pump....separately.
What at first seemed like a simple matter of enabling a couple of circuits has turned into a series of "What The Hells".
When I built the thing, I chose to not use an IAC to control my idle. I use a simple solenoid that opens and closes to allow more air into the intake when the engine is cold. That " controlled vacuum leak" allows the engine to run a little faster until it reaches operating temp.
Doing that frees up the IAC circuit. Doing that, frees up two seperate outputs that allows you to control other things.
Things like a cooling fan,...AND a water pump.....separately.
Only my IAC circuit has partially failed....only one of the two outputs work.
For the " anti-Megasquirt" crowd...here's another instance of a example of how frustrating this thing can be.
For the first 16 hours spent dicking with thing, and three emails sent to DIY Autotune over the subsequent three following days...the tech at DIY determines that I have a defect.
DURRRRRR.
Here's where I'm gonna lose 90% of you...
On the end of a MSII case are three LEDs. Those LEDs are also outputs. They're supposed to be reconfigurable, and reassign able....only you gotta figure out how to do that yourself.
Again what seems like a simple solution, and another email to DIY where they could email you back a supplemental schematic and set of instructions, nets another couple of wasted days waiting on an answer from their tech department. And nothing.
Out of frustration I call them.
Matt Cramer is one of the lead techs working there...He must also be involved in some way with the company as well.
I get passed to him and he gets on the line. Tells me that what I want to do with the LEDs is doable, but I've got my ecu wired wrong in order to be able to do it. Superficially tells me that I have to change this wire ( JS10) , to that wire, (JS0) and then goes silent......like he's waiting for me to say thanks, and hang up.
Which is what I do...thinking that I should be able to find some instance of somebody documenting this change to the wiring schematic. So I start searching...............There is nothing out there.....No instance if anybody doing anything like I want to do........EVER!
Enter Steve....
Remember the cartoon where some guys driving a old car...it breaks down on the side of the road, he opens the hood, starts throwing crap out from under the hood, shuts the hood gets in, starts the car, and drive off?
That's what Steve did to my ECU.
He gets on the phone, tells me to change this, turn this off, turn this on, disable that,.........and start the car.
So I do.........and it starts, and runs.
But.......
He has me changing stuff that don't make no sense. Signal wires that are supposed to essential to the engine running with my particular ignition system are now turned off....in effect thrown out from under my hood.
Other things like a tach output turned off.....also laying on the road next to the car now....
But, but.......Don't I need these things Steve?....
Who am I to question his madness? It runs. I should be grateful, and just move on....
But,..but...What happens when you stop being a Mustang guy Steve, and start dicking with Spaceships?...
What'll I tell that weiner at DIY then?.... "Uhhh I don't know what I got,..some guy just threw a bunch of junk out of my ecu on the ground and now it runs"?
up... just build a separate circuit in the proto area and redo the jumpers. A simple 12v protected circuit is 2 resistors and a single transistor.... I unwired my iac circuit and rejumpered both pt6(iac1) and pt7(iac2) so they act like a switch.
i just cut the fat so to speak. Your tach is fed from the edis module... so no need for the ecu to send a tach signal.. i bet there isnt even a wire attached to tachout on the board. 
