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The diagnostics box is under the hood - just behind the battery and above a big round drum (brake booster). It is a very small black box with the word "diagnostics" engraved on it - if you open it up the inside of the lid will have the pin names for the different pins in that box. If you connect ...

Sorry for the ignorant question but where are the TAT and GND pins located?

You can get engine/tranny codes yourself without the $60 computer.

For engine codes (check engine light)
http://eunos30x.com/info/CEL%20Codes%206%20Cyl%20Complete.pdf

For getting the tranny codes - similar procedure as above - but you would connect pin "TAT" (instead of "TEN") to "GND".
The codes ...

I found the correct pins to jump in several threads on this forum - but I can't find them under the hood! Where's the diagnostic box located?

So I recently - as in last week - bought a 93 MX-3 with ATX, which is the first car I've ever owned.

The hold light started flashing right away, and does so intermittently (if I turn the car off and restart it that usually helps). I gather that means the tranny might be going, but I want to pull ...