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Its been a while since I had one of these, and I'm not able to get at my resources at the moment, but I seem to remember the 93 DX being prone to ECU failure. Try removing it and taking the cover off the ECU, there was a spot on the board that would be noticeably burnt. Also, and I apologize if you already mentioned this, if the CEL is on but no code is stored, it's bad.
There is no bench test that I am aware of. The dealer uses an inline breakout box to test the circuits in conjunction with the service manual.
Good luck!
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