Engine/Transmission (1994 - 1998) tc loc up pcm question

[JJanetka]

I'm pretty sure I have a short in my pcm(47rh). The wiring harness and all connections check out ok. O/D works great. TPS and speed sensor are ok. 1kohm resistor in temp sensor(temp registers as 131 f on scan tool). Lock up switch wired in and works well. A trouble code is coming up as open/short in ckt circuit. I'm ok with the switch but would like to make it automatic if possible. Has anyone sourced a new pcm and if so how much? To those you with the ATS loc up controller, is it stand alone and if so what signals/connections does it operate on?

 

[SCosgriff]

Did you get this working. I had a trouble code 37 on mine. The only things that I had found wrong was my temp sensor is flaky and I also found a broken wire going to my temp sensor.

 

[JFaughn]

From your description it sound like the way you put the sw. in , the only way to get lock up is with the sw. ? [ a wire disconnected & or in seres ]
It would seem to me that the sw. should be wired in parallel , that way it will come on auto as original , then the sw. is used to override .

 

[Howard Durand]

If you are using the switch for TC lockup only, then all you want to do is tap into the TC control wire and connect the switch between that and ground. Do not cut the control wiring.

If you are wanting to be able to unlock the TC manually, you cut the wire and connect in a little more complicated switching scheme.