No voltage at test port

[SR71]

I have no voltage and or signal at the test port for reading trouble codes. It is a 90 Eclipse non-turbo auto. 2.0L Is this an indication of a faulty computer or should I look at some other things first? The car cranks fine but there is no spark. Also if it is the computer do I need one from another auto car?

 

[crankbender]

if you have no codes the fault spot should only have voltage at the beginning for a few seconds i believe.

Build yourself an LED blinker and just leave it in the glove box.