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  1. K

    M939 CTIS Reprogram, Anybody Done It?

    Well this one went through RSMS in June of 2012 so it was VERY end of life. I'm finding a lot of stuff that indicates they just "checked the boxes" when they went over it. Fact that it's a wrecker shouldn't make a difference really. The 8.3 motor does indeed take exactly 20 quarts with a filter...
  2. K

    M939 CTIS Reprogram, Anybody Done It?

    Nope. That's right. Just that the data plate indicates different pressures on an A2 truck (and therefore CTIS equipped) for front and rear. That would be a 2 channel system which it does not have. So maybe they intended to do so, made the data plates, product was phased out before...
  3. K

    M939 CTIS Reprogram, Anybody Done It?

    Dunno they look right to me. Fluid quantities are correct I know from PM's on the vehicle. Split tire pressure is odd. Think it was something they planned on?
  4. K

    M939 CTIS Reprogram, Anybody Done It?

    Nope. Swapped it over same thing. Firmware is holding the top at 80psi. You have to have the latest ECU for the 90psi. Hopefully Dana will get back to me I sent them screen shots of the software and explained I need to flash the firmware. At the end of the day it will never be the "latest and...
  5. K

    M939 CTIS Reprogram, Anybody Done It?

    Huh not sure why that would make a difference but I'll certainly try it and post the results! I have updated the wheel valves and had updated the pressure xducer but then swapped it back to OEM during some other troubleshooting (turned out it was a wheel seal going out). So back it goes! I've...
  6. K

    M939 CTIS Reprogram, Anybody Done It?

    I'd like to thank @74M35A2 for posting the connectors this made my task much easier. I made a breakout harness and did a lot of soldering. Got the 9-pin diagnostic broken out and used a DBA from a surplus STE/ICE kit with cable. Then I used a laptop and the Dana software. I can talk to the...
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