programming mileage/psom
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Elder User
Joined: Dec 2002
Posts: 559
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From: South Carolina
programming mileage/psom
Well, it seems I have the infamous psom ailment that so many of us have heard about. It isn't too bad, but my truck has a buck at low speeds, the bouncing needle and fidgety cruise control. I have a junkyard cluster leftover from a tachometer swap, but I have been concerned about the correct mileage. I'd like to try correcting the mileage in my spare speedometer and trade it out...I've heard that the a tone generator can run the miles up if connected properly - I assume this takes a headphone jack and a 12v power source to activate the cluster....but I can't find the instructions for doing this. I've seen the instructiions for changing the calibration constant, that's not quite it.
I'd *love* to pay Ford to do this, but I'm more creative than wealthy or patient. Who can tell me how to do this?
I'd *love* to pay Ford to do this, but I'm more creative than wealthy or patient. Who can tell me how to do this?
Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
Likes: 0
From: Round Rock, TX
programming mileage/psom
Here's the thread you're talking about:
https://www.ford-trucks.com/forums/s...ht=%25252Bpsom
Go to Steve83's post, and you'll find a couple of links that should get you there from here. Since you probably didn't cut the PSOM harness out of your donor truck, a set of jumper leads with alligator clips should work to get you connected to those tiny pins.
Let me know how this turns out; I'm curious as I have a 75k mile discrepancy on my PSOM as well.
https://www.ford-trucks.com/forums/s...ht=%25252Bpsom
Go to Steve83's post, and you'll find a couple of links that should get you there from here. Since you probably didn't cut the PSOM harness out of your donor truck, a set of jumper leads with alligator clips should work to get you connected to those tiny pins.
Let me know how this turns out; I'm curious as I have a 75k mile discrepancy on my PSOM as well.
New User
Joined: Sep 2004
Posts: 1
Likes: 0
programming mileage/psom
Hi,
I went to a place localy to me but I found them on the web. They had a rebuilt PSOM speedometer in stock programmed w/ mileage less than what most junkyards in the area wanted for theirs. I found them at http://www.dashusa.com (888) 909 9473 they have a whole section on ford psom problems
I went to a place localy to me but I found them on the web. They had a rebuilt PSOM speedometer in stock programmed w/ mileage less than what most junkyards in the area wanted for theirs. I found them at http://www.dashusa.com (888) 909 9473 they have a whole section on ford psom problems
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