durt

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.

cosmick

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

durt

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.