PSOM Reprogram Mileage Reading
Freshman User
Joined: Dec 2018
Posts: 34
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I've been working with the PSOM and eeprom for a few days now. I upgraded my 88's mechanical speedo with the 92ish one from junkyard, but wanted the mileage to match the mechanical one. So I did, right down to the tenths. So my question is, can I post my findings here? Perhaps a moderator/admin can chime in on this. The info will allow anyone who can program an eeprom to put any mileage they want on this PSOM. Post or no post?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
You have to have an EEPROM with the mileage in it to copy to another EEPROM.
I do not know of any computer program that will translate your mileage into information to burn into a EEPROM.
The information needed example.
Attachment 284286
/
I do not know of any computer program that will translate your mileage into information to burn into a EEPROM.
The information needed example.
Attachment 284286
/
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
I've been working with the PSOM and eeprom for a few days now. I upgraded my 88's mechanical speedo with the 92ish one from junkyard, but wanted the mileage to match the mechanical one. So I did, right down to the tenths. So my question is, can I post my findings here? Perhaps a moderator/admin can chime in on this. The info will allow anyone who can program an eeprom to put any mileage they want on this PSOM. Post or no post?
Freshman User
Joined: Dec 2018
Posts: 34
Likes: 0
Subford, all you need is a base set of eeprom data, edit it by hand, and write it back to the chip. Nothing magic. Could just as well use the data you posted as a base to edit for any mileage.
Eddiec1564, I didn't figure out the entire encoding scheme, but I got pretty close. Close enough to write any value I want within a few K miles.
If I can get a nod from an admin, I'll post the info. I don't see the harm considering the age of this PSOM, but I don't want to post it if it's going to be a concern.
Eddiec1564, I didn't figure out the entire encoding scheme, but I got pretty close. Close enough to write any value I want within a few K miles.
If I can get a nod from an admin, I'll post the info. I don't see the harm considering the age of this PSOM, but I don't want to post it if it's going to be a concern.
Freshman User
Joined: Dec 2018
Posts: 34
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Freshman User
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Their software, runs on the main CPU. The eeprom is simply a storage medium to store/read data. Anyone with an eprom reader can view/edit/modify it. If I discussed the encoding and format of that data, I agree that might be an issue, so I have no intentions of doing that. My discussion scope would be limited only to a "here's what I observed" style of posting. The reader would be free to draw his/her own conclusions from what I observed.
On a side note, I would never even mention any of this for the newer vehicles. Remember this PSOM module is 20+ years old. Those vehicles are becoming antiques.
New User
Joined: Dec 2018
Posts: 13
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Yes, I agree completely in the event I was reverse engineering their software. I had concerns with this, and did a little legal digging just to be sure. This isn't what is going on.
Their software, runs on the main CPU. The eeprom is simply a storage medium to store/read data. Anyone with an eprom reader can view/edit/modify it. If I discussed the encoding and format of that data, I agree that might be an issue, so I have no intentions of doing that. My discussion scope would be limited only to a "here's what I observed" style of posting. The reader would be free to draw his/her own conclusions from what I observed.
On a side note, I would never even mention any of this for the newer vehicles. Remember this PSOM module is 20+ years old. Those vehicles are becoming antiques.
Their software, runs on the main CPU. The eeprom is simply a storage medium to store/read data. Anyone with an eprom reader can view/edit/modify it. If I discussed the encoding and format of that data, I agree that might be an issue, so I have no intentions of doing that. My discussion scope would be limited only to a "here's what I observed" style of posting. The reader would be free to draw his/her own conclusions from what I observed.
On a side note, I would never even mention any of this for the newer vehicles. Remember this PSOM module is 20+ years old. Those vehicles are becoming antiques.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Fleet Mechanic
Joined: Aug 2011
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