4R100 Computer issues
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
So long as you have a PTO transmission (correct hard parts and valve body components), the PCM is the only thing that cares about PTO inputs. Yes, Pin 66 gets 12 volts but ONLY AFTER A PTO RELEARN has been done and this involves killing the power to the PCM for a little while and erasing any RAM that has saved current PTO option data. Then as you perform a short drive cycle, the PCM watches turbine shaft speed read from the different coast clutch drum vs. output shaft speed to determine if the transmission is a PTO model or not. Once the PCM learns this and power is not interrupted to the PCM afterward, you should be good to go.
There are a lot of references on the interwebz about how the PTO stuff is supposed to function and what operating characteristics are to be expected and are allowed during PTO operation. These two links have a whole bunch of good information in them.
https://www.parker.com/parkerimages/...TO-TEC-116.pdf
https://www.munciepower.com/cms/file...ll/IN97-05.pdf
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,658
From: SE Florida
On the periphery. I was part of a team that provided transmissions to an off road race team. During the life of the 4R100 that was what they used.
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