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PSOM Replacement Questions

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Old Sep 3, 2023 | 10:28 PM
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PSOM Replacement Questions

96 F250 E40D 5.8

I'm thinking my transmission problems might be caused by a bad PSOM, thanks to some help here on the forum.

I'll be headed to a JY in a few days, I can probably pull one. A few questions though:

- does it matter what the mileage is, and if so why?

- does it matter if the engine is different? The JY I'll be at has 7.3 and 5.0, where I have 5.8

- does the instrument cluster have to look the same?

- should I pull the whole cluster?

Thanks!
 
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Old Sep 4, 2023 | 01:26 AM
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Clusters are unique between diesel and gas as how they calculate rpm and the rpm redline. Diesel clusters say "diesel fuel only" on them. Clusters are unique among years because of the location of the AIRBAG light and CHARGE light moves around every few years, but they all physically fit.
The PSOM should be identical among the years. Mileage doesn't matter but the digital display only goes to 399,999 miles, then flips back to 300,000. If your speedometer is grossly off, you can reprogram it using the 2 push-buttons on the cluster face.
 
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Old Sep 6, 2023 | 04:58 AM
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Originally Posted by Prototypemech
Clusters are unique between diesel and gas as how they calculate rpm and the rpm redline. Diesel clusters say "diesel fuel only" on them. Clusters are unique among years because of the location of the AIRBAG light and CHARGE light moves around every few years, but they all physically fit.
The PSOM should be identical among the years. Mileage doesn't matter but the digital display only goes to 399,999 miles, then flips back to 300,000. If your speedometer is grossly off, you can reprogram it using the 2 push-buttons on the cluster face.
Sorry, I wasn't clear. I'm only intending to pull the PSOM (unless you're answering "yes" to my last question). Can you recalibrate the answer for that?
 
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Old Sep 6, 2023 | 08:50 AM
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Yes, safer to just change PSOM.

You'll change mileage, and probably speedometer calibration though, FYI.
 
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Old Sep 6, 2023 | 09:17 PM
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Originally Posted by Scndsin
Yes, safer to just change PSOM.

You'll change mileage, and probably speedometer calibration though, FYI.
Oh! The PSOM manages the mileage on the odometer? I didn't realize that. Shoot. That bugs me but at least now I know. Maybe I should just open the PSOM and fix it up.
 
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Old Sep 6, 2023 | 09:26 PM
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SOLVED

Thanks to everyone. I'd say this is answered.
 
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Old Sep 11, 2023 | 01:12 AM
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Originally Posted by Scndsin
Yes, safer to just change PSOM.

You'll change mileage, and probably speedometer calibration though, FYI.

You can reprogram the mileage through psom? I thought that was through the PCM / computer?

I might need to replace my psom soon and am worried about mileage if that's the case. I've also read that there are only 6 reprograms you can do of the psom.

@OP, did u fix issue?
 
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Old Sep 11, 2023 | 07:06 AM
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...PSOM...

The ONLY reprograming you can do (designed to do) is TIRE size. 6 times.

There are other electronic programing methods as per all EPROM type chips which you can research else where to change mileage.

There is physical removal/re-soldering of chip.


 
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