I am installing my 700R4 in my car, and want to put the park/neutral switch connection to the computer. Does anyone know the polarity of this wire? I presume that it needs to be grounded when the car is in park or neutral. Is that correct?

I'm assuming this because My wiring diagram shows a switch to ground, and then it says "Park Neutral Switch (A/T) (12V) (except P)" on the diagram.

Also, based on that description and the fact that this signal has a 100K input resistor and a diode to +5V on the schematics, I am assuming that it will tollerate +12V.

I am going to run my park/neutral switch to ground on one side, and to the computer and to a relay on the other side, so it will give my computer what it wants and still disable start when not in park/neutral.

Any help greatly appreciated.

 

The P/N wire goes to one side of the switch and the other side of the switch goes to ground.

 

can it just be grounded so it won't matter?

 

Yes, I understand that. The question is, is it grounded when in park and neutral, or grounded when in gear (1, 2, 3, OD, reverse)?

 

Grounded for park/neutral, open for drive.

RBob.

 

This isn't recommended. It will work, but idle control will be lost. It also affects areas of the fueling logic.

RBob.

 

Thanks. I will do that.

 

Yep...what Rbob said. That was one of the problems I was having when I first started logging with the Jeep. I hooked the P/N switch up and all was fine...till I found the #$#%@ vacuum leak I had. Now I gotta fix THAT!!!
It never ends...

 

If I have a manual bin, would it still need that input? Just wondering how I could work it out if needed. Maybe a switch on gas pedal, so that when not on gas, ECM would know I'm in neutral or park.

Math

 

Left open, can even remove the pin/wire from the ECM connector. For a stick the ECM wants it 'in drive' all of the time.

RBob.