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Old 05-21-2007, 11:37 PM   #1
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Default '94-95 MS users??

I was wondering if there were any other '94-95 MS users out there?

My problems are still as they were in this thread:
https://www.miataturbo.net/forums/showthread.php?t=8809

My MS isn't getting tach input. I think there are some wiring problems with my Miatasquirt set up and I was hoping some other 94-95 users could post some pics of their boards.

I'll post a picture of my board tomorrow, for now I can tell you it's not wired up like the pictures in the DIY article.

Hopefully kingofl337 is working tomorrow so I can contact him also.

Thanks a lot.
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Old 05-22-2007, 12:03 AM   #2
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did you jump these little guys?



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Old 05-22-2007, 11:27 PM   #3
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In response to Braineack, yes those 3 look like they are jumpered correctly.'

I have some pics but I am too tired to post them. I pulled the stock ecu apart (wired to run in parallel) and there is a wire that isn't attached anywhere. Hopefully this rogue wire is the problem. I'll post some pics tomorrow, maybe later tonight if I feel ambitious.
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Old 05-23-2007, 07:48 AM   #4
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My 95 harness did not have the RPM wire where the manual, or anything else says it's supposed to be.

On the large harness connector, there was supposed to be the RPM wire, in my case it was a "blank". The RPM wire was actually on the smaller connector, where there was from all the diagrams, a blank....

Dave,
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Old 05-23-2007, 02:59 PM   #5
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ok what about jumping D1 and D2...


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Old 05-25-2007, 09:16 PM   #6
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D1 and D2 are jumped.

The rogue wire mentioned earlier in this post doesn't appear to be the problem, just an extra wire...

I imagine the problem is in the CAS wiring. How should this be set-up? Right now it looks like one CAS wire goes to pin 24 and one to pin 25. Pin 25 goes to IAC 1A however, on my MS IAC 1A isn't double wired like in the pictures posted earlier (of braineacks board) or the pics on DIY's site.

I've talked to Adam but he hasn't been very helpful. He's open to the idea of me sending the unit back to him to have it fixed but I want this car running yesterday.

I'll post pics maybe that will help.
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Old 05-25-2007, 09:36 PM   #7
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Here are the pics

Backside of MS board. Compare to Braineack's or DIY's, quite a few differences



Inside stock ecu, rogue wire, MS pin 29. Kingofl337 says it's unused/extra.



Another pic (different camera) of the backside of the MS board.



Sorry for the bad pics, I could not get a decent picture of the board. Tried three different cameras.

I'm wondering if the MS is wired all wrong, my board is quite a bit different than Braineacks or DIY's or even the pic on KingofL337 website http://www.kingofl337.com/miatasquirt/install.htm which is the pic from DIY.

Arggghhh, I wish Adam would answer is phone. This is really his problem to fix. Thanks for looking.
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Old 05-25-2007, 09:44 PM   #8
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Braineack's


Mine


DIY


So which way is right??

My MS doesn't work, people have been having problems with DIY's instructions, and Braineack's car runs...

Sorry for the triple post.
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Old 05-25-2007, 10:09 PM   #9
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so does it just crank and nothing happens? no spark? does it combust/pop/backfire but not fire over?

the wiring on the back of the board looks ok, as far as my limited knowledge can tell.

pin 29 is iac2a, you don't have anything on there, so that wire being there is fine, you can use that for EBC or Knock later.


i think the only problem with DIY's is if you mod the board like Kag's or like them and try to mix them up....
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Old 05-25-2007, 10:39 PM   #10
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It just cranks. I know I'm getting spark because the stock ecu is running it, I was trying to get it to run on fuel only first. The MS gets no tach signal so it doesn't fire any fuel. If I switch everything over to the stock computer it will run fine but the MS doesn't see tach. With megatune open and the car running on the stock computer I get other inputs (water temp, map, air temp, spark advance, etc.) but no rpm reading and no pulse width / duty cycle readings.

I never messed around with the "2nd Trigger" Wheel Decoder. What should my wheel decoder settings be. Would this affect if I'm getting tach signal or not, I assume yes because we are getting the tach input from the CAS.
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Old 05-26-2007, 08:31 AM   #11
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That would do it-- if you don't setup the wheel decoder it can't decode the trigger wheel and won't know crank speed/rpm... and nothing will work.

Here are the settings:
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Old 05-26-2007, 11:32 AM   #12
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I'll have to try that and see if it works. Unfortunately I have to drive half way across the state to work on my car. It'll be well worth it if I can get it to work.

Thanks guys, I'll keep you updated.
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Old 05-26-2007, 10:29 PM   #13
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Unfortunately it seems that changing the wheel decoder settings has made no difference. As far as I can tell the MS is still not getting signal from the CAS.

There were two times (out of ~6) when I cranked the engine over the rpm gauge (in megatune) would flash a rpm reading. This never happened before but it doesn't happen every time and the MS won't give a rpm reading when the car is running on the stock ecu (even though everything is wired up).

When cranking should the rpm gauge in megatune be getting a constant rpm signal i.e. a fluctuating number?

I think next I'll try tapping the CAS wires directly from the stock harness. These wires are white and blue/yellow right? Which should go to pin 24 and which to pin 25?

I'm frustrated, I drove half way across Iowa hoping to get this thing running this weekend but it doesn't look so good. If I don't get it running I probably won't have time to work on it again for 2 weeks.

Thanks for the input guys
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Old 05-27-2007, 01:11 PM   #14
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Well splicing the CAS wires directly to the wires coming out of MS pin 24 and 25 made no difference. Everything is acting exactly the same. Sometimes when cranking I'll get a blip of RPM reading but most of the time not.

I wan't to be positive it's a hardware problem before I send the unit back to Adam. Is there any other settings in Megatune that would prevent me from getting a proper RPM reading from the CAS?

Thanks
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Old 05-27-2007, 01:49 PM   #15
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Whoa, quadruple post. I apologize.

So I tried cranking it over again and the MS will see a rpm signal only the first time cranking after a reset. Also now when I crank it almost tries to catch right at first. So now I'm really confused, it sorta gets a rpm reading for a second and wants to catch but it won't fire. When running on the stock ecu it gets no rpm reading.

I've attached two datalogs. One with the car running on the stock ecu, and one when cranking with the MS trying to control fuel only.
Attached Files
File Type: zip datalog_idling_stockecu.zip (6.2 KB, 41 views)
File Type: zip datalog_cranking.zip (3.2 KB, 29 views)
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