I counted pins as well and am completely sure that the correct wire (as far as the instructions go) is tapped. I did not solder connections. However, I just pulled this out of my buddy's car, spliced and crimped all of his existing wiring back together with no issues. I also have every function of the wot box except the two-step so I believe my connections are fine.
When trouble-shooting, I pulled the PCM again and tried re-wiring the specific yellow wire. When I went to start, I had nothing because the crank-position sensor wire had come undone. I pulled it again, re-spliced and crimped it and replaced and the car runs again. The wires should be making a solid connection. I may go out to solder it, but I doubt the issue will be fixed.
Does anyone know if the older PCM is incapable of the 2-step function possibly?
---------- Post added at 02:02 PM ---------- Previous post was at 01:12 PM ----------
I have an 02 so I can't say weather or not it works on older stangs but I can't imagine why it wouldn't but when I tapped into ecu I not only looked for the wire but I counted the pins/wires. Another thing is make sure you have a good connection, I soldered my connections.
Did you tap pin #21? Dark blue wire at the PCM. It's the crankshaft position sensor positive wire, correct? That's the exact one I tapped.