I am trying to connect a ms3labs Can module to a diyautotune ms3 that was built by braineack for a 95 Miata. I was wondering if anyone could point out the location of the CanH and CanL wire on the harness I can't seem to find any diagram that is matching my wires.

 

Take apart the ECU and post pictures of the top and bottom of the blue main board.

Check if any wires are going to the SPR3 and SPR4 pins.

 

MS3 Board:


MS3 Pinout (easier to read):


CANH and CANL pins are on the left, 2nd from bottom - use a multimeter on these pins and the harness to find the correct harness wires.

 

That's the ms3pro.

 

I partially opened up the board fearing of breaking any important connections. So here are some pictures, i dont think it looks the board posted above.

 

Looks like it's not wired up. Here is the page from the ms3 Manuel.

 

Awesome!! Ill go ahead and solder in those wires. Now since they werent wired in that means those slots on the DB harness should be empty as well and i would have to solder in new wires for them correct?

 

Those jumpers connect CPU pins to the DB connector, they will be on pin 3 and 4 on the MS3 DB port. You may need to add those wires to your harness on the other side, can probably just solder the twisted pair directly into the DB37 plug though. All the ones I've seen were solder cup.

Check the wiring here. I would also twist the jumper wires you add inside the ms3 too, just for kicks.

http://www.msextra.com/doc/pdf/MS3XV30_Hardware-1.3.pdf

 

As long as something else isn't using spr3 and 4 you should have to add a new wire.

im pretty sure those aren't direct CPU connections. They should have some protection circuits on the ms3 card.

 

Yup they were open. Checkded PNP harness and they were empty as well for pin 3-4.

Twisted the jumper cables



Too dark now, will run the CAN module cables to the harness pins and hopefully everything starts up.

 

Installed the new module into the car and now I have another issue. In the the tunerstudios the afr is stuck at 14.7 no matter what throttle. And the guage in the car reads --- but responds and richens up when throttled. Goes back to --- in idle. Car idles fine. I think I need to lift the car and check the aem wideband wires.