a computer question.
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i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
a computer question.
does the computer get a stored mileage in it?? or is the mileage only stored in the speedo??
if the mileage is burned into the computer, is there any way to read it to see if the speedo head was changed or to tell the actual mileage on the truck/computer??
if the mileage is burned into the computer, is there any way to read it to see if the speedo head was changed or to tell the actual mileage on the truck/computer??
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Joined: Aug 2008
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From: Frederick, MD
I think the dealer could tell you if the speedo was tampered with, Carfax maybe as well?
Whether the PCM retains that info I have not ever heard of that.
You could look at the clock hours on the motor vs the odometer and may be able to kinda get a idea that something doesn't seem right.
Whether the PCM retains that info I have not ever heard of that.
You could look at the clock hours on the motor vs the odometer and may be able to kinda get a idea that something doesn't seem right.
Thread Starter
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i ain't rite
Joined: Mar 2005
Posts: 65,426
Likes: 5,509
From: Marlboro Mental Hospital.
well, carfax and dealer are out of the question, as the truck has a salvage title. according to them, the truck has 12,000 miles on it. speedo says 35,000 miles.
that is why i was wondering about the computer.
i remember once a while ago someone saying that the mileage gets burned into the PCM, but i don't completely trust him, cause he is one of those book smart but real life dumb types.
that is why i was wondering about the computer.
i remember once a while ago someone saying that the mileage gets burned into the PCM, but i don't completely trust him, cause he is one of those book smart but real life dumb types.
Lead Driver
Joined: Sep 2007
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From: Scio, OR
I have heard the claim that the mileage is stored into the PCM as well as the console. I have never seen any documentation of this though.
One thing to remember is that, as far as I know, the PCM has two types of memory, memory that has to be "kept alive" with battery power, and memory that has to be flashed, kinda like those flash drives you can get for your computer.
KAM memory is going to be erased whenever you disconnect the batteries, so you can't really store anything you want kept there. Flash memory usually has a "number of flashes" life, although it's a LOT of flashes, do they really want to have to flash the mileage into it and at what interval would they?
Of course, all of that would seem to have to apply to the console as well.
on edit: It seems to me, that if the mileage was available from the PCM, that Ford's diagnostic software would have an option to retrieve it, and that the dealer tech's would know about this. So maybe you can call a dealer service dept and ask.
One thing to remember is that, as far as I know, the PCM has two types of memory, memory that has to be "kept alive" with battery power, and memory that has to be flashed, kinda like those flash drives you can get for your computer.
KAM memory is going to be erased whenever you disconnect the batteries, so you can't really store anything you want kept there. Flash memory usually has a "number of flashes" life, although it's a LOT of flashes, do they really want to have to flash the mileage into it and at what interval would they?
Of course, all of that would seem to have to apply to the console as well.
on edit: It seems to me, that if the mileage was available from the PCM, that Ford's diagnostic software would have an option to retrieve it, and that the dealer tech's would know about this. So maybe you can call a dealer service dept and ask.
