Highest odometer reading 399,999?
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Junior User
Joined: May 2010
Posts: 85
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From: San Luis Obispo, CA
Highest odometer reading 399,999?
I've heard that for the 92-97 generation the digital odometer goes from 399,999 back to 300,000 instead of going to 400,000? Is this true?
Greg
Greg
Cargo Master
Joined: Jul 2009
Posts: 2,541
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From: Des Moines
I'm no expert, but I don't see why it would. A mechanical odometer would go up to 9 anyway, but if it's digital, it would only do it if that's how they programmed it. Course, I s'pose they don't expect their machines to last that long anymore... [we'll see how much fire that ignites. 
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Thread Starter
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Junior User
Joined: May 2010
Posts: 85
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From: San Luis Obispo, CA
I'm no expert, but I don't see why it would. A mechanical odometer would go up to 9 anyway, but if it's digital, it would only do it if that's how they programmed it. Course, I s'pose they don't expect their machines to last that long anymore... [we'll see how much fire that ignites. ]
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Thread Starter
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Junior User
Joined: May 2010
Posts: 85
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From: San Luis Obispo, CA
I've got over 217k on mine so I might beat you to it lol.
Thread Starter
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Junior User
Joined: May 2010
Posts: 85
Likes: 1
From: San Luis Obispo, CA
I'm no expert, but I don't see why it would. A mechanical odometer would go up to 9 anyway, but if it's digital, it would only do it if that's how they programmed it. Course, I s'pose they don't expect their machines to last that long anymore... [we'll see how much fire that ignites. ]
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Tuned
Joined: Feb 2011
Posts: 462
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From: Lovettsville, VA
There's a Ford TSB about this. Yes our trucks digital odometers roll from 400K back to 300K. The PSD guys were just fussing about this a few weeks ago. I forget where the thread is though.
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4wd Low
Joined: Aug 2015
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Believe it...or don't !
Absolutely TRUE
My odometer has hit 399,999.9 and rolled back to 300,000 twice now. I sit at 560K and cant understand this one ! Regardless...l would like to display correctly. Anyone have a solution?
My odometer has hit 399,999.9 and rolled back to 300,000 twice now. I sit at 560K and cant understand this one ! Regardless...l would like to display correctly. Anyone have a solution?
Fleet Owner
Joined: May 2009
Posts: 21,437
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From: Gilbert, PA
You dont have any options
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
Back in the day, cars hardly made to it to 100K miles. Most rotted to the ground and motor was toast at 70K. Some did, but most people didn't take care of them.
By the 90's they were getting 200K out of them. Don't know why Ford only programmed them to 399K? Guess they figured why go any farther? But it really only is a simple programming issue, so why stop it there?
By the 90's they were getting 200K out of them. Don't know why Ford only programmed them to 399K? Guess they figured why go any farther? But it really only is a simple programming issue, so why stop it there?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
It is all about bits.
A three only uses two bit positions and a four would need three bit positions and there is no place to store the extra bit. There is only so much you can store in a EEPROM. The other option would be to take it back to all zeros and the states would not like that.
By the way this was only a guess.
A three only uses two bit positions and a four would need three bit positions and there is no place to store the extra bit. There is only so much you can store in a EEPROM. The other option would be to take it back to all zeros and the states would not like that.
By the way this was only a guess.
Cargo Master
Joined: Mar 2007
Posts: 2,935
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From: Arcadia, Fla
Yep, the PSOM EEPROM is the smallest one out there in storage compacity, but was the biggest EEPROM back in the days when the PSOM was designed.
I burnt out trying to figure out the parity of the data on the EEPROM......
I burnt out trying to figure out the parity of the data on the EEPROM......
