
I find my diagnostic unit which looks like this...

gently opening it, I find a myraid amount of pins! 0h n0es..

but theres none that are labelled Test ENgine or GND (or anything else for that matter.)
Where have I gone wrong

oh and I have gigantic versions of these pics + a few more, I'm happy to host them and put them in the FAQ after some editing to label them up? Hows that sound!