Hi there again!

I am reading this post and realized that I was buzzing around the first part of this post with some explanation of how the ECU OR ICU work off the CPS signal and turns on the fuel relay.

So now I think I will try to tell you what I know of the diagnostic box. For the most part it is a "full bunk box." It can only direct you to many possibilities!

Whoa, shucks I might be as bad! I will not claim that I know all there is about the codes.

It is my opinion and is its mostly agreed by some on the board that it's only a shotgun blast at a blank wall. The direction it gives only locates a wall.
You have to unscramble the blast pattern on that wall of possibilities and start picking!

Oh well here goes with my limited knowledge!

The number two socket is only for emissions purposes. If there is a CEL it means there is a emissions problem or something that can cause one. In your case you are not emitting anything because it's not running or not running enough to throw up a code. For the moment it's a black hole or blank box!

The number six socket is for checking a limited number of components.
I don't remember that the CPS is one of those.
The number six port is a static check. That means the engine is not running so for the CPS there is no test per say!

The port two socket when engaged might reveal a code for no RPM signal. Fail componet or bad wire, bad reception going to the ICU or ECU is a guess for me.
Art might have tricks he has found to test all of these but he is the Master Guru! I am the little lost Grass Hopper. In grass around the shade tree at times.

With that said, I will shout around the tree to a fellow car owner, you, that several of us have been there done that!
If you leave things unplugged and crank the car it might throw the codes, so along somewhere, you find yourself trying to diagnose the little box and not the working components of the car.
Some people call that going down a rabbit trail or chasing a wild goose!

I am afraid that there is a simple explanation for your dead car and it's something basic to the fuel burning triangle.

Just work patiently in increments and with all of us. We shall find it.

Phil