There is. But I believe they are rare/expensive/both. Suprman (SS member) chased it down pretty good and found one was made for a field update kit. He also says the CTIS diagnostic kit for the xMTV series trucks may use the same piece. But, I don't believe he ever acquired one. Since I have not seen any other posts about people running the diagnostic program or reflashing their target tire pressures, I simply assumed they were hard to come by.
For me, I like making stuff like this. It forces you to dig deep and understand each and every terminal and purpose, and the satiafaction of having the laptop screen say "Connected" when first turning it on is amazingly rewarding having built it myself. Or, I'm just easy to impress. Even the CTIS tech support guy at Dana was wrong in his saying there is a diagnostic port in the truck to connect to. Ummm, no there is not, and I confirmed that when I did a pin-by-pin shakedown of the truck side module connector and found the exact pins missing for both bus communication lines.
There are 2 parts needed to communicate with the CTIS modules on any M939A2 vehicle: An interface harness which taps into the communication pins in the CTIS module connector (not present in truck side wiring connector), and a 2 channel CAN module communication adapter which deciphers the 2 way language utilized by the CTIS module. Then of course the (free) Dana diagnostic software on your laptop.
