I'm sure most of you know that the computers on these trucks will eventually need to be either replaced, rebuilt, or bypassed. My truck is a 1992 D350 dually with an automatic transmission. We had a replacement computer at one point and it worked great, but when someone was driving it they kicked the fuse box and ruined the computer so the original computer is in it. We would send the original to be rebuilt but we've had bad luck with sending the replacement computer (we never got it back), And we dont have enough time for the truck to be down. The problems we're having (and we assume they're due to the computer) is that the speedometer, cruse control, and odometer dont work, the A/C compressor isn't getting any voltage to it, and the TPS gets out of adjustment very fast. We've replaced the speedometer sensor that's in the side of the transmission and we've also replaced the plug that plugs into the sensor, and we've tried making a jumper on the plug to see if it would make the speedometer do anything. I don't want to bypass anything because id like to keep it as original as possible so i'd rather not have a bunch if buttons and switches mounted into the dash. We've looked for trucks in junkyards but we cant find any trucks. We've looked online to see if we can find a computer and we haven't had any luck. Any help would be greatly appreciated.

 

I think I have at least one auto PCM for a '92/'93 Cummins truck here.
PM me if you would like.

 

Car-Part.com--Used Auto Parts Market ?

If/when you exhaust your search...

https://ramchargercentral.com/diesel...your-dodge%27/

 

If Oliver doesn't have one.. I saw that one a few weeks ago.


There's a guy on Ebay rebuilding them. Not sure what is done... not sure what's inside. Tempted to open one up strictly to see what's inside.

 

they just try to repair blow traces and if possible replace burned resistors usually they don't last long as every single chip has spent 26 years undergoing the same heating/cooling cycles and oxidation does form at the microscopic level on the chips surfaces so in the end attempting to "refurbish" one is just a matter of chasing your tail as if ya restore one blown chip then it simply overworks another 26 year old chip etc...

Basically if you can't find a working replacement (preferably one that has not been sitting stored out doors collecting oxidation) then your only option left is to follow the decomputerize option linked in the post above... they stopped making spare parts for these trucks in 2002 (government requires they keep up spares for 10 years) or so and no real after market support

BTW; HOW did someone kick the fuse block? its buried under the steering column and is mounted faced away from the driver... or is yours just hanging loose under the steering column insteada being mounted behind the panel?

 

Possibly some spontaneous activity of an amorous nature triggered a sudden muscle spasm resulting in unintended damage......Ben

 

Have you replaced the CPS sensor and ensured you have the proper gap, you functions that are not working are all controlled/turned on when the PCM sees a signal from the CPS to let it know the motor is running.

 

If the battery is still charging, doesn't the CPS and part of the PCM have to be ok?

 

I have no idea how someone could have kicked it. It happened before i could drive. It was one of the times my dad let by sister borrow the truck.

 

I think maybe Fordzilla may have nailed it lol