Diesel PCM to TCM for 4L80
 

This is not a 3rd gen question but on a 94 Chevy truck. Since this is the most knowledgeable place I know for the inner workings of GM products, I'm hoping someone can help.

I have a 94 K1500 6.5l diesel which had the electronic injection pump. I converted to a mechanical pump and used the single TPS signal to feed APP 2 in order for the transmission to operate. It does an OK job of running but I think there should be a way to split the TPS signal and feed APP 1 or APP 3 to get better operations (shifts hard at times).

I can wire and run a standalone TCM, but don't want to do that. The current PCM has the capability to operate the trans I just need help figuring how to duplicate or bypass the APP/TPS signal.

Also, if this is the wrong forum, where to post it?

Attached is the 94 wiring diagram. Any help, guidance, insight or alternative methods are greatly appreciated.

Re: Diesel PCM to TCM for 4L80
 

I'm not understanding how your proposal differs from '92, when the PCM controlled the 4L80E but not the 6.5TD?

Re: Diesel PCM to TCM for 4L80
 

The 92 used only 1 TPS input, the 94 has 3 different APP inputs (the same as TPS) from the electronic accelerator. The 94 is a drive by wire system, no throttle cable.

Looking for a way to duplicate the needed TPS signals and feed them to the APP inputs using the existing PCM. I want to use the existing PCM to properly control the trans, don't want to have to wire and install a TCM.