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

 

ive heard of it, but ive only got 108,000 on mine, so ill let ya know in about 7-10 yrs lol

 

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. ]

 

I have heard this to be true also.

 

I believe that they did program them this way. They must figure that few people will ever make it to 400k. Still better than the late 80s models which roll back to 00,000 at only 100K!! never could understand why they designed one with the highest reading at 99,999

 

I've got over 217k on mine so I might beat you to it lol.

 

It is digital btw

 

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.

 

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?

 

You dont have any options

 

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?

 

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.

 

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......

 

Look at the leftmost digit on startup. It should do a self-test, displaying all the segments. The leftmost digit doesn't have the segment in it that would display a 4.

 

200K is all I got...