Okay, I've narrowed my no start issue down. My question is this though.

I have theAPEXI PFC btw

I install a known corrupt/bad pfc in my car and I can see the tach bounce and car will fire right up. Even w/the screwed up MAP sensor readings. Okay so now I remove that unit and install a known properly working unit in my car, and I can't get no signal from the CAS. Tach stays dead @ 0 rpm. no fuel no nothing, just cranks.

Ok so Riddle me that please.

Going to pull the harness for the millionth time tommorow and trace the CAS wiring. This is a single turbo harness too btw. Not one that I stripped down

 

Ok so I pulled the CAS connectors and w/key on I was getting + signal from ECU to both connectors. Now when I probed the - side on G I got a reading of 1.8mV now when I probed - on NE it read nothing.

Now since both CAS share the same ground wire per FSM diagram. I should get the exact same ground mV reading on both connectors right?