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They can go out of spec and also get debris in the seat, etc. The relief valve on my air dryer got some rusty crap in it and started leaking and I found out through some research that Haldex had increased the pressure of the relief valve on these dryers so I changed it out to the new spec. I was...

If you haven't rebuilt or replaced all the wheel valves that could easily be the problem. They are typically NASTY inside. I would also replace the PCU relief valve and rebuild the PCU if it hasn't been. It requiring adjustment is a great troubleshooting step but ultimately this indicates to...

What did you end up doing for that error again? You might want to replace the relief valve or try a whole different PCU since I have never seen that problem with any other truck. My system works flawlessly on my '08 A1R and I've never had to press a mode button more than one time.

It is true that the older CTIS control boxes don't coms with J1939. The newer FMTV ones do, but the older green box units and even the older black box units do not and since the 900 series trucks are older also I would not expect that they are capable of operating on J1939 anyway - so it may be...

WABCO ABS module is also on the J1939 although I haven't got one to speak over that bus - only via J1708. They will complain with an ABS light though if the bus is down. According to the schematic they are connected to both busses. It is also possible in theory to connect the 260 amp alternator...

Another member here reported a similar issue with his truck - burnt up resistors on the J1939..... I can't give an explanation of why. He replaced it and his data bus worked fine. There is only two wiring diagrams for the flange mount unit in the troubleshooting guide and both use the same pins...

All of the CTIS boxes are 24 VDC - indeed the M939 has only 24 VDC systems so I'm not sure what SUPPLIER 16V is in reference to exactly. Nothing important I would say. I have the software on my google drive because no one can seem to find the Dana download for it anymore. It's only 8 Mb...

You can modify the PPM from the transmission to suit the CTIS controller with one of these: https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1192/mode=prod/prd1192.htm

Doubt that would work without a LOT of effort. A lot of this software is cracked and relies on direct hardware access and has problems working even under actual windows machines. It's flaky and difficult to get to work under the best conditions. It you have all the time in the world to devote...

As a software engineer in a former career path I understand the sentiment and for me the disembodied hand of Steve Jobs ghost can keep his bony fingers the hell out of my wallet..... but all that aside - the military standardized on Windows so if you want to have any meaningful coms with the...

It depends on which controller you have, and the power/ground/open state of pins M and Z. And as Ronmar pointed out you could have a skewed pressure transducer signal, or someone changed the programing with the diagnostic software. Best way to know for sure is to hookup the diagnostic software...

The listing says MRAP, M939, FMTV, LMTV. Guessing it would fit an M35A3 also.... probably other stuff as well. There are no stock programs I'm aware of that run 65 to 70 psi in HWY. You will have to program it. Also what you "guess" and what a tire chalk says and what the truck decides it's...

Not really, no. You can find the Dana controllers brand new for like $600 to $700. And used one's are $100 to $200 and will continue to land on the surplus market for decades in both new and used form. With the free software, an RP1210 adapter that you should probably have anyway if you have an...

I've had one of the 5 light failures also. But the one and only Arduino I've touched was also bricked. So there's that. They have continued to make improvements in the controllers - the one I'm currently using is a 2012 black case unit that can coms with J1939. @Lostchain has a 2016 unit that's...

The Dana controllers are pretty good actually. Especially the later black unit that speaks J1939. That's the only one to get IMO. The Arduino option(s?) are interesting but the truck I'm troubleshooting at the moment seems to have bricked one of those (lights up and then the display just fades...

My point is you can get the exact same effect with a SPST switch and a few inches of wire. No transducer, no plumbing, no 12 feet of wire, and it doesn't throw off the controllers atmospheric pressure reading. And with a SPDT switch, and a few more inches of wire to a ground you can have 12...

Well this is going to make a few people (including myself) feel really silly...... I've been getting pretty deep into a CTIS diag on a friends truck and had the occasion to swap modules between my truck and his, and vice-versa. And I've been going over documentation and troubleshooting info and...