DIYPNP 1994 No spark, No RPM signal. - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-31-2015, 06:28 PM   #1
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Angry DIYPNP 1994 No spark, No RPM signal.

Hey guys,

I recently built a diypnp v1.5b for my miata, with the intention of boosting it. The car is currently NA, and I'm trying to get it running on megasquirt before I turbo it.

I built the board with the offical DIYPNP guide, and then performed every cross connection, pull up, and configuration from this writeup:
DIYPNP MegaSquirt installation for the Mazda Miata
Everything works on tunerstudio, I have intake temp, coolant temp, and fuel, but the ignition circuit appears to be entirely absent. I have checked every connection having to do with the rpm and ignition signals, including testing from the microsquirt pins to the output pins of the converter board itself, and everything checks out perfectly. However, there is no rpm displayed while cranking, except for it changes to 1rpm from 0rpm when I begin cranking. I'm really pulling my hair out on this one, I've tried every single thing suggested in every forum post related to this issue, with no change whatsoever. Any help with this would be appreciated.
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Old 07-31-2015, 06:32 PM   #2
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I should add that the car still runs perfectly using the stock ECU.
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Old 07-31-2015, 06:50 PM   #3
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what didnt you do correctly?
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Old 07-31-2015, 06:56 PM   #4
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If I knew that I wouldn't be posting
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Old 07-31-2015, 07:06 PM   #5
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You had to have built it wrong, or you've been bit by the "loading a 3.3+ MS3 firmware on a 3.2 MS2 basemap" glitch that may not exist that I don't care enough to try and replicate.

DIYautotune's website has nice pictures showing what the board looks like populated, I suggest you compare side by side like those old newspaper "spot the difference" games...
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Old 07-31-2015, 07:06 PM   #6
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Is there a way to manually test the cam angle sensor circuit? I feel like my problem lies somewhere in there.
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Old 07-31-2015, 07:08 PM   #7
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I literally just told you, visually compare it. If you don't get a rpm signal cranking, it's ******* toast in settings or hardware.
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Old 07-31-2015, 07:11 PM   #8
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No need to get feisty- I posted that reply before yours showed up.

I'm doing a visual inspection ASAP
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Old 07-31-2015, 07:20 PM   #9
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Checked the board, nothing looks wrong. I feel like it's a software thing.
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Old 07-31-2015, 07:26 PM   #10
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Which firmware did you load?

Compare these settings to yours, they may be in different places if you loaded a MS3-esque firmware.



Stuff I underlined may be different. Don't use those numbers.
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DIYPNP 1994 No spark, No RPM signal.-d7uukxj.png  
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Old 07-31-2015, 07:38 PM   #11
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I am using the ms2/extra 2.10. It's old, I used it because it was the firmware quoted in the crossover guide that I used.

My ignition settings window looks different than yours, and I'm not sure what the red highlighting means, but everything else looks alright.

would you recommend I use a later firmware?

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DIYPNP 1994 No spark, No RPM signal.-80-bjkilfyuil_fbedad693e782b80fbfb3607679344cd16e3ad72.png  
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Old 07-31-2015, 08:48 PM   #12
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If you don't see any indication of crank or cam signals from the composite logger then you built the DIYPNP wrong in some way or another. I don't see loading a newer firmware helping. Jumper configuration does not change via firmware, but I have a hunch loading old tunes on new firmware has the potential to scramble some renamed settings.

Tunerstudio layouts change by firmware, I don't know what the red bars mean but I bet it's because those are pretty critical settings, not error checking or anything like that.
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Old 07-31-2015, 08:56 PM   #13
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Flashed a new firmware and took a log of cranking, not sure exactly what I am looking at but it looks like I have input from the CAS.
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DIYPNP 1994 No spark, No RPM signal.-80-erg_6fc9d6d83865f3af6691a173f5857c290357eff5.png  
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Old 07-31-2015, 10:45 PM   #14
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you're not getting a cam signal.

why did you load such an old *** firmware?

use 3.4.0.



you either did the jumper wrong or forgot the pullup.


pics of assembly.
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Old 08-01-2015, 02:04 PM   #15
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Here's some pics of my assembly. I left out the radiator fan and A/C pullups, but those should not be crucial to getting a spark. I've also got mixed information on weather or not I have to jump the ignition pins near the top of the board.






Attached Thumbnails
DIYPNP 1994 No spark, No RPM signal.-80-board1_180ab04e6016b56fcfe2838e8d327bfa83b527c1.jpg   DIYPNP 1994 No spark, No RPM signal.-80-board2_d768a78cd1b1bc985bfb3e579bfa4da1e66f5d97.jpg   DIYPNP 1994 No spark, No RPM signal.-80-board3_fc4184c8f2a6390c0634ab493abda91954d10d4f.jpg  
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