PSOM Reprogram Mileage Reading
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Joined: Sep 2001
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PSOM Reprogram Mileage Reading
I've seen the information about recalibrating the PSOM for tire size etc. Does anyone have the information on how to reprogram the actual mileage reading? I have a different one that I'd like to use, but would like to program the actual mileage, so that it matches the truck.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
Anybody with a EPROM burner can just copy the mileage from one board to the other boards EEPROM chip. It is not rocket science.
Or you can buy a eprom burner off of ebay and do it yourself.
Or you can un-solder the EEPROM and solder it into the other board with or without a soldered socket.
Or you can buy a eprom burner off of ebay and do it yourself.
Or you can un-solder the EEPROM and solder it into the other board with or without a soldered socket.
Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
Anybody with a EPROM burner can just copy the mileage from one board to the other boards EEPROM chip. It is not rocket science.
Or you can buy a eprom burner off of ebay and do it yourself.
Or you can un-solder the EEPROM and solder it into the other board with or without a soldered socket.
Or you can buy a eprom burner off of ebay and do it yourself.
Or you can un-solder the EEPROM and solder it into the other board with or without a soldered socket.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
You might want to read through these links:
https://www.ford-trucks.com/forums/1...r-display.html
https://www.ford-trucks.com/forums/1...splay-fix.html
The red square is the EEPROM chip.
/
https://www.ford-trucks.com/forums/1...r-display.html
https://www.ford-trucks.com/forums/1...splay-fix.html
The red square is the EEPROM chip.
/
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Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
Subford.
I just swapped in a 93 lightning 120mph speedo into my 92 f150 90mph.
Is it still possible to swap the 92 eeprom chip into the lightning psom and it still work correctly and keep my org mileage?
The threads mention the eeprom keeping the mileage and gear ratio, i just want to make sure the speedo isn't affected.
I just swapped in a 93 lightning 120mph speedo into my 92 f150 90mph.
Is it still possible to swap the 92 eeprom chip into the lightning psom and it still work correctly and keep my org mileage?
The threads mention the eeprom keeping the mileage and gear ratio, i just want to make sure the speedo isn't affected.
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Fleet Owner
Joined: Aug 2005
Posts: 23,668
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From: Easton,Ks
I think the program in the large chip is what decides on how far to drive the needle. But this is just a guess. The EEPROM chip is just an information storage device for when the power is off.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
As for resetting mileage to a specific number, I have not figured out the data encoding parity, so no go(yet)on changing mileage beyond swapping data sets around.
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Joined: Sep 2001
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It looks like he is sending a false signal so it thinks its being driven. That would work to add miles but not take them off. It would take a while to have it come back around and up to the correct mileage doing that. From what I understand it rolls over to zero again after 400k.
Thread Starter
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Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
Subford.
I just swapped in a 93 lightning 120mph speedo into my 92 f150 90mph.
Is it still possible to swap the 92 eeprom chip into the lightning psom and it still work correctly and keep my org mileage?
The threads mention the eeprom keeping the mileage and gear ratio, i just want to make sure the speedo isn't affected.
I just swapped in a 93 lightning 120mph speedo into my 92 f150 90mph.
Is it still possible to swap the 92 eeprom chip into the lightning psom and it still work correctly and keep my org mileage?
The threads mention the eeprom keeping the mileage and gear ratio, i just want to make sure the speedo isn't affected.