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Old 11-25-2013, 11:07 AM   #1
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Default mspnp2 failure from diyautotune?

Hey guys finally broke down and got a megasquirt and wow I was blown away how well my car ran even on the base tune. However after 300 miles something went terribly wrong. I set out on a road trip and about 80 miles in, injectors 1 and 3 were stuck wide open. I reloaded the base tune and nothing. A buddy at the shop i hang out at said it might be a injector driver. Diyautotune has been helpful, but has anyone else had a bad pnp? Were they willing to fix the mistake? Anyways I also checked my entire harness for shorts and it runs ok on the stock ecu. Just a little disappointed for 820 dollars... I guess it could happen
with anything. Also on a side note diyautotune needs a phone number haha!
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Old 11-25-2013, 11:17 AM   #2
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We had a supplier change transistors on us without warning to ones that had a slightly different package size. These could contact the case and short out. As soon as we found out about the problem, we came up with a way to fix it, but a couple slipped out before we realized what's going on. Sounds like you got one from that batch. We can get these repaired and turned around in a few days; it's an easy fix. Sorry for the inconvenience.
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Old 11-25-2013, 07:33 PM   #3
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No problem I appreciate the fast response. I'll test it out of the casing, and keep you guys updated. I've been working with Stephen a little bit on the issue. Can't wait to get off work and be able to drive the miata again!
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Old 11-27-2013, 03:20 PM   #4
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Hey just following up I took it out of the case and set it on a antistatic mat. Injectors still stuck. Where should I go from here?
Thanks!
Chase
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Old 12-12-2013, 01:15 PM   #5
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Hey Matt, are you guys closed for the holidays? Ive sent 3 emails with no response. Hoping to get back on the road soon. Thanks!
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Old 12-13-2013, 02:25 PM   #6
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Quote:
Originally Posted by claurence42 View Post
Hey Matt, are you guys closed for the holidays? Ive sent 3 emails with no response. Hoping to get back on the road soon. Thanks!
I also had not heard anything from Matt since Monday. I got a response today after leaving a voicemail yesterday. I guess one of the techs was on the road all week and the other was dealing with some urgent issues.
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Old 12-18-2013, 12:03 PM   #7
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Originally Posted by Leach0789 View Post
I also had not heard anything from Matt since Monday. I got a response today after leaving a voicemail yesterday. I guess one of the techs was on the road all week and the other was dealing with some urgent issues.
Pretty much - most of our techs were at PRI. Things are back to normal now.
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Old 01-06-2014, 12:49 AM   #8
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Just wanted to say that Matt and his team were very helpful and got everything cleared up, even shipped it two day air to CA. Thanks guys!
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Old 07-17-2014, 07:04 PM   #9
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Hacksaw worked for me
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Old 07-18-2014, 10:51 AM   #10
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That was about what the fix was, until we could get a new board spin out.



You can see the new design uses an internal heat sink (at left) designed for the new packaging.
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Old 07-18-2014, 03:24 PM   #11
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curious about this hacksaw fix...
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Old 07-18-2014, 03:41 PM   #12
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Sorry, should have been more descriptive ....

So basically I came across a situation where the MSPNP worked great when not in the enclosure, but as soon as I buttoned it up the car would behave very strangely. This includes rough idle, rich AFR, poor starting, and operational changes with connections/disconnections of the USB cable. I discovered that we were getting battery voltage into the case, which was creating various shorting paths (through the USB cable for example). This is measurable by using a DMM between any of the connector shells to the GND reference. You will see a non-zero voltage.

The cause is a TO package mounted to the connector panel (presumably for heat dissipation) shorting the TAB connection to the enclosure close to the screw from the connector panel into the extrusion. I simply used a hack-saw to cut the tab back (on a diagonal) such that the tab no longer made contact with the enclosure when closed. The hacksaw fix damaged the insulation pad under the TO package, so I used electrical tape to provide electrical insulation.

It should be noted that I doubt this unit was DOA. It was given to me by a miata buddy who has gone Hydra. I am pretty sure he picked it up pre-owned, so I have to think somebody used it before, with good results.

So if your car starts running super rich, and showing operational changes with USB connect/disconnect events, I would look here first. I do not have a picture handy, but if I were to describe the location; it is on the baro sensor side, MS connector panel (not the car side), last TO package in the bank of 4.
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