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any luck?Let me try my J1939 based CTIS interface tool with the 120 ohm CAN bus resistor. Give me a bit to dig it out.
[mention]Superman [/mention] can reprogram them I think.any luck?
So did you get it done?Let me try my J1939 based CTIS interface tool with the 120 ohm CAN bus resistor. Give me a bit to dig it out.
Some green modules after 1998 can communicate with the tool on a J1587 link. All black modules should be able to use a CAN link.So did you get it done?
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 replaced 4 of 6 hub seal sets so far..... If they last another 10 years I'm OK with that.IIRC the last 10psi was achieved by the updated pressure transducer, different resistance???, I’m guessing we discussed this earlier in this thread. I should still have a couple NOS around here, if needed I could make you a decent deal on one. I think I still need to get one 74m one as well.
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.IIRC the last 10psi was achieved by the updated pressure transducer, different resistance???, I’m guessing we discussed this earlier in this thread. I should still have a couple NOS around here, if needed I could make you a decent deal on one. I think I still need to get one 74m one as well.
Maybe @Stellaevil could be some help.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...
Any chance you can post a picture of that entire data plate? Wondering if it’s for the wrong truck.….My data plate says off highway should be 60psi front and 30psi rear...
Correct, these are single circuit systems. Unless inop or disabled all the tire pressures will be maintained at the same pressure..
Am I missing something?
CTIS sets all tires in the Central Tire Inflation System to the same pressure.
Granted, front at one pressure and the rears at another is perfectly normal, but not with CTIS.
.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 (like the data plate says) but the TM says 23.7 I think. Some differences make me think it's either an old truck worked back up to an A2; or some rollouts made it and some didn't before they pulled the plug and replaced the models. We'll probably never know.
Meanwhile I haven't heard from the Dana people. I need to get into that firmware. In to the back programming. I'll pester them again in a few days.
Got any pics of your harness? Thinking I can just use the factory pigtail on the truck and solder the diagnostic wires onto the back of the pins or if the pins are missing install the missing pins/wires.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 676422 black module but not any of the green modules I have around like the 599730. Both the J1708 and J1939 protocols will connect but it appears they do different tasks. Like I can change the off road pressure under the J1708 but the J1939 won't update. Maybe still have some stuff to figure out. I did NOT use any terminating resistors FYI.
My next stop is to get in touch with Dana and see if I can update the firmware. My issue now is my max pressure allowed is 80psi and I need 90 for the M936A2. That was the whole point of the project. I can't seem to find any 676603 ECU anywhere.
So yes you can do it. Lots of soldering and studying the schematics. M939 was never wired for it but it CAN BE DONE. Appreciate everyone who contributed here made the task much more straightforward.
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