Check my MS harness...
 

Ok... 1993 miata... MS standalone... (fans on thermoswitch for now)

DB37 ---- Miata
7-9 ----> 2A (ground)
17-19 ----> 2C (ground)
20 ----> 2P (Intake air temp)
21 ----> 2Q (Coolant temp)
22 ----> 1N (tps 0v - Vb)
23 ----> 2N (O2 sensor)
24 ----> 2E (ignition input, CKP, primary)
25 ----> 2G (ignition input, CMP, secondary)
26 ----> 2L (tps vref)
28 ----> 1B (main relay power)
31 ----> 1H (Ignitor B, 2/3)
32-33 ----> 2U (Injector 1/4)
34-35 ----> 2V (Injector 2/3)
36 ----> 1G (Ignitor A, 1/4)
37 ----> wired in car to lt.green for Fuel Pump

Here is the link for the ecu pinout sheet on the car..
https://www.miataturbo.net/~web1_bra.../ecupinout.jpg
Here is the DIYautotune mods
http://www.diyautotune.com/tech_arti...azda_miata.htm

Hows that look? Wrong/right....

Anyone? I have 30min to mod it before i spend 2.5hrs getting to the car to work on it tonight....

If all is well... I'll be starting car up tonight on Akaryrye's 550cc Al Hounos based map...

I can't note on the ECU pinouts but the MS side of it is correct and same as how i wired up my '99. Are you using bullet connectors or something like that?

I'm using the 18" Diyautotune harness and a boomslang obd1 Plug. I'm aiming for the only non plug/play wire to be the fuel pump... until i figure out which car harness wire i'll give up and tap for that purpose.

For getting the car running... i'll find it under the dash for now.

One of my concerns btw is the TPS vref and TPS... I've got a manual.... and will be using a Nissan TB/tps... so i'll be using the wiring from the miata on a nissan tps...

Take a soldering iron with you.
Not saying i know that something is backwards but when i was getting spark to work i had my coil wires backwards and the car wouldn't fire. Never looked to see if i had it wrong compared to the documentation or what but that fixed my spark problem. The nissan TPS will be an interesting setup. Take pics of how you adapt it to the miata.

I doubt it will matter. All tps's are just 5 volt potentiometers. Scott might be able to shed some more light though since he just wired up the auto tps to the manual harness.

Thats exactly what I'm looking for... basically if i got it right :p.

Well.. my picture host from my build is down... but with the intake manifold we built we used a Nissan TB... bigger than the miata one and variable tps... basically we used it because it was sitting in the garage :p

I basically wired the 3 wires the same. switch > switch, ground > ground, TPS > WOT, then I'm tapping the 5ref off the line that goes into 2M off the AFM harness.

I see, i didn't know you were using the Nissan TB. I was assuming you were making a sweet little adapter for a nissan TPS to mate it to the miata TB. Stock throttle cable gonna work for you fine?

Stock cable is working fine. Custom manifold made it easy to use something else. We had a complete (with real tps) Nissan one sitting around and used it. I can easily goto a even larger TB later by retapping and boring out our TB baseplate.

So no start... not feeding fuel or spark. Ignitor gets warm, but nothing untouchable. Fuel pump primes (I found the lt.grn wire inside the cabin... i took pictures for reference later).

Grounds are good I believe.... thoughts?

Are you getting an RPM signal when you crank it?

You know, I don't think there was RPM when my friend cranked it while I watched the gauges in MT....

Btw. "stim as wheel" gets me RPM fine in MT with the stim attached (off when on car of course).

Found one flaw in the DIY autotune harness. It is supposed to have blue (14 gauge) at pins 32+33 and green (14 gauge) at pins 34+35. I just opened db shell and checked wires with a meter... its reversed. Blue is 34+35 and green is 32+33. So I know my ignition stuff was reversed... I'll remedy that by just switching the blue/green on my obd1 harness.

Here's my exact wire up... (without the green/blue swap)
ECU - DIy harness color - Diy Harness pinout
1B - red - pin28
1G - brown - pin36
1H - grn/wht - pin31
1N - blue - pin22
2A - blk (14/big) - pin7-9
2C - blk (14/big) - pin17-19
2E - shielded white - pin24
2G - blue/white - pin25
2L - gray - pin26
2N - pink - pin23
2P - orange - pin20
2Q - yellow - pin21
2U - blue (14/big) - pin34+35
2V - green (14/big) - pin32+33

2U and 2V (blue/green) are ones I believe are incorrect according to originally following diy harness pinout/wires vs checking it physically.

Boy i hope i didn't fry my ignitor (that would happen with reversed ignition wiring right?). At least knowing I haven't gotten fuel yet means its something else off also.

Oh... the ecu pinouts are from the ecupinout.jpg curtosey of Braineack.
ECU pinouts as per the sheet, wording is off sheet... [] used for my comments.
1B = Main relay power
1G = Igniter
1H = Igniter
1N = Throttle Sensor (idle point) 0V-Vb [on/off? or maybe 5-0v...shrug]
1R = Fan switch (wanna figure out this for ecu to control fan)
2A = Ground (Injector)
2C = Ground (CPU)
2E = Crank Angle Sensor (Ne-signal)
2G = Crank Angle sensor (G-Signal)
2I = Igniter (unsure what this is compared to the Igniters on the 1 plug)
2L = Throttle Sensor (Power terminal) [wot - 5v and closed - 0v)
2N = Oxygen Sensor
2P = Airflow sensor (intake air thermosensor) [GM IAT wired in]
2Q = Water Thermosensor
2U = Injector (nos. 1,3)
2V = Injector (nos. 2,4)

Reversed injector pinout shouldn't be an issue, but I'll check some of our stock of harnesses to be sure they aren't labeled incorrectly.

Oh yeah duh, the reversed ones are batched injectors. No ignitor frying there :p Still, its something I at least found I could fix.

So... any thoughts?

Did you double check this?

how is your spark output mod? like the DIY's writeup? I'd suggest it may need to be reversed and altered slightly.

X 2

Until you get a RPM reading in MT, you dont need to mess with other stuff.

My build/mods are per the DIY autotune page.

I get RPM with the stim as wheel setting in MT... never got a chance to check it on car. Won't be at car until this weekend... and its back to its home 1.5hrs away :(... and no internet there for some assistance.

if you dont get spark try this....I never got spark with the way they show it. and once i did it was reversed. I believe this is how it should have been written up.


https://www.miataturbo.net/braineack/MS/sparkmod.jpg

Whats strange to me is that I wasn't getting fuel either.

If I'm not getting a valid rpm signal... would that prevent all firing of fuel/spark?

Remember.. I'm not getting spark or fuel (checked for both).

Just swapped the blue/green. So hopefully thats at least heading in the right direction.

Won't know anything until this weekend though sadly. And being 1.5hrs away... lots of trip to diagnose stuff I kinda need help on.

So toss out ideas... I'll compile them... and try them all until the darn thing works :)

Oh... just in case... any way to confirm/deny igniter is bad/good? It was good when I parked the car... hopefully I didn't have wiring goofy for MS and hurt it.

If there is no rpm signal, the engine must not be turning, right? So if the engine isn't turning, there is no need for fuel.

MS will fire a prime pulse upon startup, and then wait for an rpm signal to start injecting fuel. no rpm = no fuel or spark

Plugs I've checked have had 0 fuel so far. (no start up of course)

I have fuel pressure and the MS primes the fuel pump without issue.

Dual feed fuel rail, stock fpr and freshly cleaned 550cc RX7 injectors btw.

https://www.miataturbo.net/braineack/MS/jumpers.jpg

Just redid my ignition stuff to this format.

Also... realized my fuel wire running to the microprocessor pin... was 1 off :p.

So... wish me luck this weekend.

It's ALIVE!

The plug/play harness works :)

whadaja have to do?

I switched from the DIY autotune MS config for ignition to the one picture I posted of Neogenesis's board.... worked. I also fixed a fuel wiring issue of my own fault.... was off by one pin on one wire.

yeah that board is mine, Brian wired it and it wouldnt spark either, modded it like that and it was fine. That why i suggested the diagram i posted, I believe it's what diy intended to post.

Got yah, I went off the picture Neo passed on to me basically because it worked. And... thats good enough for me :)

Maybe we need to see if anyone else has had spark issues with the DIY autotune mods as per their page... and if so... suggest they update it with the above modifications.

we have suggested, they claim it works for them. I say for it to work there must be some other things that need to be done to the board.

Welcome to the sickness!