PLEASE HELP!!!

[repairman54]

Now that you know which circuit is the problem you need a wiring schematic to figure it out.

May be a pinched wire from prev. work, critter damage, etc. .

I use Alldatadiy for information for my "fleet" . A one year subscription will pay for itself and they have all the wiring diagrams.

[Taekdown918]

It is weird. By replacing the PNP Switch it should of went away. For some reason when I take it out of park it grounds out the low voltage reference signals. Only thing I have not checked is the sensor up further. The chiltons book has not been much help. Maybe Haynes will be better. This has been fun tracking down. Electrical can drive you nuts. From what I read the PNP tells the ECM which gear it is in but why would it run great unplugged, I lknow why. It is not killing the systems low voltage reference for all of the sensors. Some how when the shift lever moves it is causing a ground out. I just need to figure out which one. I will keep you updated. If anyone has any other ideas let me know.

[Mike GMC]

The only thing I can think of is that at least 1 of those 3 powered wires is grounding out somewhere. I have no idea what they are for.

[Taekdown918]

I am going to see if I can buy the diagrams.