IAC Issue

I've got a check engine light with code p0505 for the IAC. I've confirmed with three different sensors that the sensor itself is not the problem. The throttle body is clean. I believe I'm having a wiring issue. I was wondering if there is a typical problem like what I'm having or if I just need to start tracing wires? I can't find a wiring diagram that can help...

if known good sensors do not solve the issue (btw are you resetting codes before changing sensors?) it must be wiring best bet is to chase wires (i looked at the diagram they just join with the engine harness and go straight to the ecm)