DIYPNP 1994 No spark, No RPM signal.
07-31-2015, 05:28 PM
#1
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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.
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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07-31-2015, 06:06 PM
#5
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...
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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07-31-2015, 06:38 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?
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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07-31-2015, 07:48 PM
#12
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.
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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08-01-2015, 01:04 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.
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01-12-2020, 11:39 PM
#18
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Not the OP, but I had a very similar sounding issue with my diypnp (96 though). What ended up being the issue was some extreme feedback from my iacv. I installed a flyback diode across the leads on my iacv and bam everything fired right up.
if you haven’t give that a shot I highly recommend it. You should have a spare diode in your kit. If not, pm me. I bought 100 off amazon and I’ll send you.
if you haven’t give that a shot I highly recommend it. You should have a spare diode in your kit. If not, pm me. I bought 100 off amazon and I’ll send you.
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01-13-2020, 11:14 AM
#19
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Wow, I never would have guessed that being the reason for the missing cam signal. I didn't build this diypnp so I don't have any extra diodes laying around. I'll take you up on that offer to send me one. Thanks for the help!
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