does DTT or ATS transmissions come with a new PCM? I think mine is bad and am curious.

 

AFAIK none of them comes with a new PCM since it isn't necessary. DTT will add a voltage regulator for the gov. press. sensor but that's it.
What are the symptoms ?

AlpineRAM

 

well I have 5 volts at all times on both the signal wire and the supply wire of my tps wires, even when the tps is not plugged in. I think there is a short in the PCM, its causing the tranny to not shift out of first until you let off the throttle, and no OD

 

Sorry I don't have experience with that problem. But actually I think that the TPS signal is used to control OD and lockup only, the rest is regulated by comparing governor pressure with line pressure (that depends on the throttle valve cable adjustment- maybe worthwhile to look into it.)
When was your last fluid and filter change? Did you adjust your light throttle shift points sometime?

Just pondering

AlpineRAM

 

No they don't. You'll have to go to the dealer and buy a new one.

 

Have you tried a new TPS? If I remember right, the TPS should have 5 volts on one wire all the time, and since it is letting it all through to the signal wire I would think it is bad. Alpine is right, our trannies are HYD. controlled, there are 2 pressures (throttle and line pressure) and they interact and control the shifting. PCM only controls OD and TC lockup. PCMs are like 600 bucks from my dealer

 

the TPS wasn't even connected and it showed 5 volts on both wires, thats why I think the PCM is bad, it may be a short somewhere in the wiring, but I need to check that first.

 

Just call Bill @ DTT and you'll get the right answer.. He has never had a problem with answering ANY of my questions.. even calling his cell phone on a weekend and talking for over 20 minute's. And then he call's me back later to check on how thing's worked out..You cant beat that!!

 

so anyone have a PCM for a 95 they wanna sell?

 

Well, I tried putting a new PCM in and nothing worked. not only did the trans not shift correctly, but the alternator would not charge, and half the lights on my dash would not come on. and no AC either. what do you guys suggest? I put my old one back in. should I go get it reprogrammed at the dealer or somethin?

if so, what would cause it to go into this mode?

 

The TPS is somewhat adjustable due to slop in the mounting bolts. You can test your TPS yourself with a VOM. Insert the leads into the proper plug wire pins, and with engine off, ign on, rotate the TPS through it's range of motion. If the voltage signal move steadily the TPS is likely good. If the reading is erratic or jerky the TPS is bad. The entire diagnostic procedure may be found on http://dodgeram.org/

 

It really sounds like on of the solenoids on your valve body could be bad I had shifting problems on a 47re and that was my resolution

 

see I tried this and it appears as if the TPS is putting out 5 volts all the time on the signal wire that goes to the PCM, and I checked its not the 5 volt supply wire. but when I unplug the TPS and stick the probes in again, I get 5 volts on both wires still. when there should be 5 on the supply wire and nothin on the other am I right?

with the TPS un plugged I kinda checked its resistance variance and it seems to be working, so it should be good.

 

Try to unplug it from the ECM and check for a short between the 5V supply and the signal wire. If you find 0 ohms between the 2 pins you know it's in the wiring loom and then the fun begins- for testing purposes you can wire a parallel wire from the TPS to the PCM- best if placed far away from other wires so you have a noise reduction.
The bad shiftpoints in the lower gears lead me to some other suspicion. Maybe also some wires going to the tranny are bad or you've got an internal short in the tranny sensors or solenoids themselves.

HTH

AlpineRAM

 

I did that. I cut the signal wire right at the ECM and checked for shorts and the 5 volts was actually coming right from the ECM on both wires.

it actually skips right over 2nd gear. Even if I physically put it in 2nd it stays in 1st. then when it shifts, it goes straight to Drive.