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EPROM’s
- Thread starter twisted60
- Start date
Basically yes but for the later PCS TCMs which do not use a PROM.
Some are EPROMS and some are PROMS, the difference is the EPROMS can be erased using UV and re-programmed and a PROM is a one time use device, no difference to the end user.
I have some of the hex files and can erase and program them, I would like to build a library of the different files, then if I got really bored I could dig into the hex files and decipher the differences and even come up with custom shift points/DTCs etc.
The "major" differences are the NA and turbo chips and likely has more to do with the gearing than the weight, they may have also added or dropped what DTC codes would and would not light the trans light and possibly what actual perimeters set DTC codes and fixed any bugs as time went by.
Some are EPROMS and some are PROMS, the difference is the EPROMS can be erased using UV and re-programmed and a PROM is a one time use device, no difference to the end user.
I have some of the hex files and can erase and program them, I would like to build a library of the different files, then if I got really bored I could dig into the hex files and decipher the differences and even come up with custom shift points/DTCs etc.
The "major" differences are the NA and turbo chips and likely has more to do with the gearing than the weight, they may have also added or dropped what DTC codes would and would not light the trans light and possibly what actual perimeters set DTC codes and fixed any bugs as time went by.
Last edited:
NEWS | July 7, 2021
HMMWV: TCM Has Replaced EPROM
Photo by Sgt. Kristina Truluck
Mechanics, make a note that the erasable programmable read only memory (EPROM) has been replaced by the one-piece transmission control module (TCM), which is needed to operate your unit’s HMMWVs.
If you have a HMMWV that’s NMC because it needs a 2-piece EPROM and you try to order a replacement for it, your requisition is going to be rejected.
You also don’t want to order a transmission because it won’t come with an EPROM.
Send any questions you have about ordering correct parts to the HMMWV maintenance team mailbox at:
HMMWV: TCM Has Replaced EPROM
Photo by Sgt. Kristina Truluck
Mechanics, make a note that the erasable programmable read only memory (EPROM) has been replaced by the one-piece transmission control module (TCM), which is needed to operate your unit’s HMMWVs.
If you have a HMMWV that’s NMC because it needs a 2-piece EPROM and you try to order a replacement for it, your requisition is going to be rejected.
You also don’t want to order a transmission because it won’t come with an EPROM.
Send any questions you have about ordering correct parts to the HMMWV maintenance team mailbox at:
HMMWV: TCM Has Replaced EPROM
Mechanics, make a note that the erasable programmable read only memory (EPROM) has been replaced by the one-piece transmission control module (TCM), which is needed to operate your unit’s HMMWVs. ...
www.psmagazine.army.mil
Re: Which E-PROM
Post by 86humv » Thu Aug 05, 2021 4:51 am
Here's the line up :
TCM-2100AA, AB, AC are turbo trucks.
TCM-2100BA, BB are M1097A2 NA trucks.
Post by 86humv » Thu Aug 05, 2021 4:51 am
Here's the line up :
TCM-2100AA, AB, AC are turbo trucks.
TCM-2100BA, BB are M1097A2 NA trucks.
I have heard some swap them, I can't remember which way, IIRC they put a turbo chip in a NA truck and it shifts "better" in their opinion, but again I do suffer from CRS.
The later TCMs are crazy expensive compared to simply getting a refurb older style.
You can get a refurb for about the same price
If somebody can point me to a refurbished one for $200 that would be great.
I have a failed tcm-2100.
@twisted60 How did testing for spares work out?
I trying to figure out the most economical way ahead to get my truck on the road. Has anyone found a rebuild service that is reasonable. Is it possible to pull a unit from a GM truck and used that?
I have been told that BSE tcm609 works but the pictures look completely different.
I would appreciate any help.
Thanks
I have a failed tcm-2100.
@twisted60 How did testing for spares work out?
I trying to figure out the most economical way ahead to get my truck on the road. Has anyone found a rebuild service that is reasonable. Is it possible to pull a unit from a GM truck and used that?
I have been told that BSE tcm609 works but the pictures look completely different.
I would appreciate any help.
Thanks
He has a failed TCM so he is looking for the info on replacing it with the older style.