Does anybody know exactly what would cause my speedometer to max out when only going 5 mph or so. Also my odometer stopped working at the same time and says error. I just got my transmission rebuilt and I need to have this fixed due to the trans and the speedometer not working together properly thanks!

 

What is the conversion constant set to?
If it was set at 1.0 that would do it.
If not that you more than likely have a bad PSOM.

Conversion constant set to 1.0:
Attachment 279754
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PSOM is most likely dead. I just ordered one for my truck 20 minutes ago from Module Mechanics in Florida. I was having hard shifting issues and ran all of the diagnostics that I could find. Speedo worked perfect but signal wasn't being transmitted to ECU. I'll know in a day or two if that's the issue, I'm reasonably confident that it is.

 

What is a PSOM? MY 95 SPEEDO IS BOUNCING ALL OVER WHEN ABOVE 70 KMH/45 MPH AND TRANNY BANGING SHIFTS HARD. : REBUILT DIF, NEW V.S.S. (VEHICLE-SPEED-SENSOR). TRanny shop says nothng wrong with transmission, scatching my head, mechanic scratching his head. WTH?

 

A PSOM PC board:
Attachment 279742

Attachment 279743

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FORGIVE MY KNOWLEDGE-VOID. ON THE BACK OF THE SPEEDO OR IN THE BOX UNDER THE HOOD?

 

It is inside the cluster enclosure.
The "SPEEDO" (speedometer head) plugs into the PSOM PC board.

 

: THANK-YOU.

 

K, NOW, CAN'T FIND ONE. LOCAL SHOPS SAY ITS TOO OLD, AUTO PARTS STORES SAY NOT AVAILABLE TO BUY. GOT ANY SUGGESTIONS?

 

Yes I get mine from pick-n-pull salvage yards.
Then copy my mileage and the trucks setup into the new PSOM.
Then set the change times to 6.

 

Shut off the caps lock then take a look here: https://modulemechanics.com/product/...epair-service/

 

Hey there SubFord, exactly how did you do this?

 

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