Speedometer/Odometer Failure
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,835
Likes: 364
From: Candy Mountain
Speedometer/Odometer Failure
My speedometer/odometer went dead last night after passing over a rough bit of road and then came back a mile or so later during a hard manual shift. No other systems went down, so I presume it is something specific to the PSOM. Looking around it is most likely a problem with the 296 Hot in Run circuit or something on the PSOM board itself...
Is there anything else I should be looking at, common failures?
Thanks!
Is there anything else I should be looking at, common failures?
Thanks!
Logistics Pro
Joined: May 2022
Posts: 4,285
Likes: 2,416
From: Everywhere and nowhere
Check the speed sensor in the rear axle. If it goes so does your speedo. Its only 1 bolt to replace but they have an O-ring so you might want a flathead screw driver to pop it out.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
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From: SE Florida
The speedo and odo get their reading from the VSS. If the VSS doesn't work, neither does the speedo or the odo.
Logistics Pro
Joined: Nov 2013
Posts: 3,928
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From: Mojave, Ca
Mark, I believe the OP is stating that his odometer blanked out, as if it wasn't getting power.
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Fleet Mechanic
Joined: Aug 2015
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From: Candy Mountain
Correct, the display was blank.
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Lead Driver
Joined: Oct 2016
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From: Houston/Sugar Land
Yes but he said it is working now. Perhaps the VSS could have had some tone ring shavings that effected it?
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Fleet Mechanic
Joined: Aug 2015
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From: Candy Mountain
Thread Starter
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,835
Likes: 364
From: Candy Mountain
I have driven the truck over the bumpiest roads I could find nearby in an effort to re-create the problem without success. I also had no success wiggling wires that I could get to under the dash. I have not yet, but will pull and inspect both fuses.
Mountain Pass
Joined: Jan 2004
Posts: 153
Likes: 19
Mine died a couple of years ago. I had to send it out to be rebuilt. If I remember correctly, it's like the PCM in that there's a capacitor or something that corrodes and pukes all over the board.
I sent mine to these guys: https://modulemechanics.com/product/...epair-service/
I sent mine to these guys: https://modulemechanics.com/product/...epair-service/
5th Gear
Joined: Jan 2016
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I have a '92 F150 Flairside 5.8 4X4, that had the same issue, took it to the dealer & hundreds of dollars later told me it needed a new instrument cluster that was special order, took it to a shop suggested by the transmission shop that rebuilt the transmission, 1 hour of shop time traced it the speed sensor, problem solved.
Logistics Pro
Joined: Nov 2013
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From: Mojave, Ca
I have a '92 F150 Flairside 5.8 4X4, that had the same issue, took it to the dealer & hundreds of dollars later told me it needed a new instrument cluster that was special order, took it to a shop suggested by the transmission shop that rebuilt the transmission, 1 hour of shop time traced it the speed sensor, problem solved.