Hi Guys!! A little update on this August 2014. As an owner of a 1998 200SX SE-R using a 1997 ECU I asked JWT (Ben Pila) about this and here's the official response:
Hi Luis,
I double checked with our lab engineer about the pin 112 to pin 111 wiring question you mentioned. Pin 112 is a ground and if you notice on the factory pin out diagram, that it ties into the same ground wires as pins 106, 118, 38, 10, 19, 44, 40, 41, 45, 43 and 39 and maybe a few others. All these tie to each other and then go back to the engine block or intake manifold as their final termination. Our engineer says the 3 ground wires attached next to pin 112 are all the same ground plane therefore are "redundant" grounds. So borrowing one of those grounds to make the ground happen to pin 111 which is the O2 sensor heater circuit, is not a problem. So our diagram is correct and our wiring information is also correct. It is much easier and cleaner to simply de-pin the pin 112 and move it to pin 111 than to try to physically solder on a jumper between pin 112 and pin 111. Pin 111 on the 98 does not even have a pin or pin/wire in that location. So moving physically pin 112 into pin 111 is the best option for a reliable and functioning circuit. So the SR20 forum person/people that made the posts about this are incorrect and our information is correct.
Just wanted to share this info with you all.
Luis