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One solution could be to check if pressure when inflating is below the preset. This means that there is not enough pressure in the tank and that the tires will deflate instead of inflate. Doing so it can be avoid that the pressure in the wet tank gets below a critical level. Than it can be used...

That's easy, it's just inverting the boolean value. But it's a risk because with no signal the controller thinks he have full tanks. So there is no protection against wiring failures. Christian

Hello! Yes, I use the wet tank input switch. There is no need to change any logic input, the original one close the signal to ground at 120 and reopens at 80 or something like that. At least you use a switch to ground you can use anything. Important is that it's closed to ground when you want to...

Yes, they work also on A1R because no connection to the can bus is needed. The CTIS is almost isolated from the rest, except the speed sensor signal. But that I do not use. I also rebuild the controller to be more failure save against electrical issues. Plus it now have 5 presets instead of 4...

Deleted due forum roles. Christian

Thank you Ronmar! I think we should test it on a A1R, Third from Texas wrote me and I will send him a unit for testing. Right now is difficult to find a vendor for the MIL plug, but I will do my best ;-) From the schematics I am quite sure that the important pins (solenoids, wet tank pressure...

Thank to you! Nice to hear that you're happy with it! Christian

Don't know if they really change the wiring on A1R, if someone have a actual wiring diagram for the A1R CTIS harness I can give a look. In my eyes the main diffrence is the speed sensor. A1R use CAN bus, older versions a modulated signal. But I am not using the speed signal because I think that...

Right, you have to split the entire CTIS system in 2 parts, front and rear. No ECU for now will handle that, except if you add a intermediary valve and switch from front to back manually. So PCU and ECU do not know that only 1 axle is measured. But you can't set 2 diffrent pressures, so you have...

What I know (and I do not know much) is that from A1 (the black ECU) speed signal is not a digital signal, but on CAN BUS. This can explain why overspeed warning do not work. The entire ctis is from dana/spicer, I don't think they changed the wiring, if it's always the same round connection...

Thank you SIR! :-)

There are some error messages, like PCU sensor fault, leaking wheel valves (if there is a heavy leakage), but not more. The ECU do not read the speed sensor to warn if you are in overspeed with low pressure. Christian

Thank you sir! Christian

Hello all! As announced, here a short and unprofessional video of my Arduino CTIS ECU. It's an example on how it works when pressure is too low, it works also when pressure is to high. You can set 4 diffrent pressures depending your needs, and works with 4x4 and 6x6 trucks as well. You do not...

Hello! Yes, I just finished 2 for a M1088 and M1078 I think... Christian

Hi there! I will make one the next time I'm using it. But please don't expect anything magic, it's quite simple and easy...

Hello! Thank you Sir. The problem is that the hole sistem is not single tire controlled, but there's only 1 pressure sensor under the dash. So if you want to control every single tire you need to rebuild all the system. In that chase I would think about using the hydraulik pistons on front axle...

Hello all. As promised the Arduino sketch for the CTIS controller. The sketch is complete, but the I/O pin's are set on default. This because depends on the wiring (I made a PCB). The sketch is also able to read / write the default pressures of the 4 terrain modes. You need to write the 4...

Hello! I now build in total 4 and sold 3. If someone need a complete ECU as descibed before I will sell them for 200$ + shipment. Christian

Hello all. Sorry for the late answer, but due heavy work I did not found the time to answer. After 2000 miles I must admit that the Arduino and CTIS do a great job. It works like a sharm, every 15 minutes checks the pressure and adjust it. No problems after all. More problems with broken...