This is my first time posting but I'm not sure what else to do about the problem I'm having with my truck. I have a 1996 Xlt and can't figure out what to do with trying to figure out whats wrong with my truck. Me and my buddy went and put it on IDS and there were no codes until we did a key on key off test and the only code that came up was p1667. Its not the IDM because we switched it out with another truck of the same year and it didn't change a thing. So I'm basically left with it being a possible short somewhere or the PCM is bad. i want to check if it is a short before i go and buy a PCM. I don't have a breakout box and am wondering what to do next. I just want some input on this.