Hi there.

I recently build a DIYPNP (MS2/extra), board 1.5B. My first build. I am (~94%) confident that I got all the connections down by the book. I used these instructions: https://www.diyautotune.com/support/...oard-assembly/

I then flashed the firmware (without boot jumper, but it seemed to work anyway), and the .msq/basemap (attached)

Unplugged my stock ECU, plugged in Megasquirt. The car crancks over, but doesn’t start. Not even a splutter. The car is stock , I still even got the MAF in.



Clues:
I checked the spark output in test mode. Sparks seems to be working.
I tried to see if ignition was at 10 BTDC, but I couldn’t see whith the engine cranking over at ~200rpm.
With original ECU, timing reads 14 BTDC.

When I turn the key to power the MS, I hear a pump go on for a few sec. I assume this is the MS taking control of the fuel pump, right? – I also remembered to unplugged the ST SIG fuse before starting.

In Autotune studio, I found that the settings was out of spec with what I was expecting. For instance the engine displacement was set to 350cc, and injector flow was at 0cc. Changing them to 1600cc and 240cc did not make the car start. Are these settings not supposed to be incorporated in the .msq file, or do the .msq file only configure spark and fuel tables? If I should fill in all setting myself, is there a list of the settings I need somewhere? I attached a log file I recorded while trying to start the engine and the basemap I was using. I am not too sure one how to use trouble shoot using the log file though.

I am sorry for the noobness, this is the first car I am tuning (or hopefully will be tuning ).

My car is a European mx-5 1,6 (116hp) if that makes any difference.

Any help is appreciated. Kind regards, Søren, Denmark.

 

By the way. I checked the spark plugs after trying to get the car started with the MS plugged in. They seemed very dry, so I think it might be something with the injektor setting. I am on stock injectors as the car is only getting a m45 (jackson racing) supercharger

 

Check injectors in test mode too. Make sure all 4 are clicking, euro models might be like cali models here, with sequential injection. If those are working fine, its most likely an issues with your crank/cam signal.

 

Thank you

I reinstalled the MS and turned on ignition. The summing noise from the pump came on for a moment. Then I realized I forgot to remove the ST SIG fuse. So, now I probably fried something in the MS L
Anyway. I went to test mode:
Spark test: I could hear the clicking.
Fuel pump test: I could not hear the pump go on. Probably because I forgot the SG SIG fuse L - I will still be able to drive the car with my stock ECU, right? This is my daily driver
Tested injectors: I could not hear anything. How loud are they supposed to be when tested?

 

also, according to this thread, 1990 Uk Engine Into 1997 Uk Mx5? - Mechanical & Electrical - MX5Nutz Forum, my car should have batch fire injection.

King regards, Søren

 

sounds like you are not getting good cam and crank signals. the the st sign fuse, it sounds like you did fry the fuel pump circuit in the MS if you are no longer hearing it come on at key on. You can get around it by wiring it like braineack does.

For the CAS signal, you will need to do a composite logger to see if you are getting good signals from them.

 

Alright. So I will get the fuel pump circuit fixed, but for now will just jumper F/P to ground in the diagnostic box.
How do I do a composite log? If it is a bad signal from these, should this not affect the stock ecu as well? Car starts and runs great when I plug in the stock ecu.

Kind regards, Søren

 

you will be getting a good signal on the chassis side, but your MS isnt reading them right or your jumpers inside the ecu arent right.

Did you follow https://www.diyautotune.com/support/...3-mazda-miata/

Did you do the jumpers for VR2 and Opto?

 

Yes, that is the guide I followed. And yes, I did the OPTO and VR2 jumpers. Is there any way I can see if my MS is reading the crank correctly in the log-file I attached? I cant seem to find it anywhere.

Thanks a lot for helping me out J

 

Take a composite log. It's a tab in tunerstudios, right by auto tune. Click "save to file", name it whatever, try to crank it for ~15 seconds, attach that here.

 

Okay, Thanks a lot Curly. I will do the test as soon as i get back from vacation

 

Hi there. I finally got some time on my hands to fiddle with my miata
I followed Curlys advice and made a composition log file (attached). To my eyes it seems that the MS reads the crank. Any suggestions?
Kind regards Søren Bobek

 

Hi guys. I found out that i had soldered the VR+ to 4G on the adaptor board instead of VR2 to 4G. Also, on the microsquirt module, the 10 pin connector had not been soldered lol. I dont know how i could have missed that. But hopefully my car will start after i fix this Sorry for the trouble.

Kind regards Søren

 

Just a follow up: THE CAR IS RUNNING NOW YAY

 

lololol. well there you go. That'll do it everytime. Now you can play with tuner studio and tuning. Plenty there to learn and to keep you busy.