Miata Turbo Forum - Boost cars, acquire cats. - Can't get my RPM to sync MSPNP2 Exocet build

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- - Can't get my RPM to sync MSPNP2 Exocet build (https://www.miataturbo.net/mspnp-55/cant-get-my-rpm-sync-mspnp2-exocet-build-101818/)

Can't get my RPM to sync MSPNP2 Exocet build

I've been searching everywhere for a solution to my issue and I've tried several "fixes" but I'm just out of ideas and apparently knowledge.

I've got a 1999 engine and a second hand MSPNP2 (I know, first mistake) and am just getting my feet wet in the whole standalone ECU and tuning world.

I have everything hooked up as it should be, I think, with an Innovate MTX-L and the GM IAT sensor. No turbo yet. Everything seems to be working fine except that I'm not getting any spark and I'm getting the "not RPM synced" red button illuminated.

The OEM ECU works fine which tells me my crank sensor is set correctly and the car runs perfect with the OEM ECU.

I've downloaded the most recent firmware and followed several videos on setting up the base map for the '99. I've tried several different settings based on some forum recommendations but they make no difference. I'm concerned at this point that my MS2PNP is suspect. Since I didn't build this one I really don't know where to begin on troubleshooting the damn thing, so here I am.

Pics below of the MS2PNP innards and I've included my tune files if anyone is interested in helping.

I'm so close with my turbo build and I'm in the final stretch but this one has me stumped.
https://cimg5.ibsrv.net/gimg/www.mia...e4d828aca7.jpg
https://cimg7.ibsrv.net/gimg/www.mia...47735ffe5c.jpg
https://cimg9.ibsrv.net/gimg/www.mia...4ef39ba798.jpg
https://cimg1.ibsrv.net/gimg/www.mia...a43eb5f3dd.jpg

I forgot to respond to your text. I'm unsure how to help with this one. Maybe someone else can offer something.

That's a DIYPNP, not an MSPNP2. Was it wired for an NB1? Run a composite log so you can see the cam and crank signals to see what's the culprit.

Quote:

Originally Posted by acedeuce802 (Post 1558413)

That's a DIYPNP, not an MSPNP2. Was it wired for an NB1? Run a composite log so you can see the cam and crank signals to see what's the culprit.

DIYPNP. My mistake. The guy I bought from had it running in his ‘99 Miata so I’m assuming it was wired correctly for the NB1’s. I included an attachment of my composite log. I’m not really sure what I’m looking at. I see that the RPM is zero but not sure where to look for cam and crank signals.

It seems like everyone who has had this issue downloads an updated firmware and then they stop posting. I’m assuming the firmware fixed their issue. I downloaded the Microsquirt firmware. Is there another firmware version I should be using instead?

I’m afraid to just start swapping firmware because I read that using the wrong firmware can fry your ignition.

Can anyone point me in the right direction on which firmware I should be using for my build version?

Thanks

Forget the firmware change for now. It's not likely to be your issue.

Do a composite log as already suggested.

Quote:

Originally Posted by SpartanSV (Post 1558445)

Forget the firmware change for now. It's not likely to be your issue.

Do a composite log as already suggested.

My first post has my composite log attached. I attached my tune and composite log. I’m pretty sure the .msl file is a composite log, correct?

Quote:

Originally Posted by Garman (Post 1558447)

I’m pretty sure the .msl file is a composite log, correct?

Nope.

Quote:

Originally Posted by SpartanSV (Post 1558451)

Nope.

Shit. Okay.

I’ll have to figure out how to do that tomorrow.

Okay. I see what the composite log is now. I’ll log and post it up tomorrow.

I appreciate the help.

You are on the right track

I should be back at it this weekend. I'll get that composite log up by Saturday.

Here’s a photo of my composite log.
https://cimg0.ibsrv.net/gimg/www.mia...1483eb720.jpeg

Here's the composite log file.

Missing cam signal.

What year miata was this ECU built for? What alternator are you running? What harness are you running?

It was built for a 99 which is the same as mine. I’ve got the original 99 harness.

I’ve got the stock alternator I think.

I've only built a MS3. I don't really have any experience with MS2. I believe MS2 does not support alternator control which means you'll have issues with a NB alternator

Edit: To clarify, I believe the lack of alternator control applies to a DIYPNP. Which is what you have. A MS2PNP has a separate circuit for alternator control. That's why I'm a bit suspicious of this ecu being built for a 99 chassis.

Mine has the alternator control board but I’m not sure if I need to do anything to get it working. It has a tuneable pot for adjustment.
https://cimg2.ibsrv.net/gimg/www.mia...12e6b651a7.jpg

I was told this is an MS2PNP but apparently it’s DIYPNP?

Sorry for my lack of knowledge on this. I’m just getting into this tuning world. I’ve read about every thread on this but I just can’t get a clear grasp on it.

Ok back to the main issue then. That separate board should handle the alternator. I can't make out the pictures of the spaghetti. What is VR2 connected to?

https://www.diyautotune.com/support/...0-mazda-miata/

That's DIY's assembly instructions. VR2 is your cam signal AFAIK. 3H should be correct. Make sure the pullup resistor is in place and jumper settings are correct

Cool. I’ll double check the assembly.

So it looks like the pull-up for VR2 is installed to the 12v. From everything I’ve read it should be 5v right? It ohms out at 466 so that seems okay.
https://cimg8.ibsrv.net/gimg/www.mia...023baeaf6.jpeg

Hot damn! I switched that resistor over to the 5V instead of 12V and she started right up! I need to get some things sorted out but it's running now. Thanks for everyone's input.

Awesome! Glad you got it going.