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diagnostic box

Old 09-14-2011, 03:26 PM
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does anyone know if the SGND and the GND in the diagnostic box are actually the same thing ?
I see all the pics and info says jump out TEN and GND ,yet everything pints or shows the SGND and Ten so just wondering if they are two different pins or are they the same thing
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Old 09-15-2011, 12:37 PM
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signal ground vs ground.

both ground, just to different locations.
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Old 09-15-2011, 12:43 PM
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I would assume a Signal ground would be a ground for a sensor, or something sending a signal. A regular ground would be something for a motor (IAC, Fuel Pump, etc..).

I could be wrong, but at least it makes sense.
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Old 09-15-2011, 04:54 PM
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I took both of them were the same just wanted to double check
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Old 09-15-2011, 06:11 PM
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I will say that when I use S-GND it didn't allow me to go into open-loop for setting idle. but when I used GND, open-loop worked just fine.
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Old 09-15-2011, 06:33 PM
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Originally Posted by Track View Post
I will say that when I use S-GND it didn't allow me to go into open-loop for setting idle. but when I used GND, open-loop worked just fine.
Is it possible that you did not get a good connection with your jumper when you went to SGND ? The reason I ask is when I di dmine the other day I was sure it was in open loop. When I did it again yesterday I realized it that it wasn't. The first one I did several days ago I looked at the tach before applying the jumper and then again after I put it on . The Rpm had dropped down so I thought the jump was good. When I did it yesterday the car died ,and I had to raise it up quite a bit
Being a 99 there may actually be a difference in the two pin locations not sure though
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Old 09-15-2011, 07:06 PM
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the pinout for NB is different from the NA. you can see both in the "How-to: intake manifold.." in my sig.
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Old 09-15-2011, 09:21 PM
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Originally Posted by Track View Post
the pinout for NB is different from the NA. you can see both in the "How-to: intake manifold.." in my sig.
Track I read your article and that is really good, the only thing I think you have wrong is the diagnostic box labeling the one marked for NB is the NA and the one marked NA is for the NB.
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Old 09-15-2011, 09:23 PM
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Originally Posted by mytwo View Post
Track I read your article and that is really good, the only thing I think you have wrong is the diagnostic box labeling the one marked for NB is the NA and the one marked NA is for the NB.
Glad you enjoyed it and thanks for the correction, but how do you know? I am led to believe otherwise...
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Old 09-15-2011, 10:09 PM
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I just went out and looked at my 96 ,the difference in it and the one below is I have SGND on the left where it has GND
here is a 94 diag box 1.8
http://forum.miata.net/vb/attachment...chmentid=78406
here is a 96
http://gnu.20m.com/miata/miata.html
here is a 97
http://forum.miata.net/vb/showthread.php?t=409119
here is the 99
http://miatas.livejournal.com/47206.html
I don't say they all do or not do the same function I have no idea Just know both of our 96 looks like the pic of the 96
I did read that both SGND and the GND in a 99 is different than the 97 and earlier ,it is two different functions in the 99
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