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That can’t happen unless your tires are over ~85 PSI or you are drawing CTIS air from somewhere else. CTIS(and the fan) pulls air from the protection valve and it wont let air out of the wet tank unless the tank pressure is over 85PSI…

That was the point of the question, a switch that closes at 120 and opens at 90 is not all that easy to find, and the original CTIS wet tank switches are obnoxiously expensive. how hard would it be to invert that logic, as a close at 90, open at 120 air compressor control switch is a very...

You shared your code with me once upon a time and sadly I don’t remember the specifics of your programming. I have 2 questions after helping a few people resolve ctis issues. 1. Are you using the wet tank pressure switch input? 2. How hard would it be to invert its logic input to your...

Oh ye Yes, Christians arduino based controller should work on any truck, same as the manual approach, as the original controllers used the same PCU control and pressure sensor pinouts on that cannon plug H is 28V, F is ground. R, B & C(to F) are the 3 solenoids. b,c & j are the PCU pressure...

Well from the A1 schematic, it shows 3 possible power feeds(H,M & Z). With 3 feed points, you could control up to 7 different program responses/configurations. If they kept pin H as a constant, as it seems to be shown as connected in all the info I have, you could switch between 4 different...

I will look back thru my notes when I get home.

I believe they all use the same connector, i think the difference lies in which pin in the connector receives power, which determines how the controller is supposed to behave. Had this discussion a long while back with someone and we discovered different power on different pins…

What makes them different is the vehicle harness. I think at some point they tried to make one controller work with and behave differently in multiple vehicles. iE: different pressure settings for a highway tractor vis a truck that may see more off-road time. I believe they did this by...

The A1R isn’t any different than the A1 or A0… same PCU using same control wires from the controller. Same dump valves and wheel components also…

The air is applied at each hub via an individual air line attached where the hub assembly attaches to the ends of the axles. The lines split at the dump valves, that have one input from the PCU, two outlet ports(one to each wheel) and the dump vent. You could put a solenoid valve on each of...

You would need a different PCU or another set of intermediary solenoid valves to divide up the system into front and rear sections…

Yea they all use the same PCU and sensor…. Now wether they assigned different wiring for that at the controller end of the harness may be an issue. They do have different dash harnesses in the different trucks…

Leaking axle seal, fitting or hose? Front or rear? On rear check the axle air vent line where it connects to a vent up on the frame. On the front, roll the wheel so the filler plug on the gear cover points up and remove it and activate the system. You are looking for air coming from that gear...

Very Cool Christian!

Tom my switch still cycles at high RPM untill the tire pressure reaches somewhere over 65PSI. At that point the wet tank outflow to CTIS decreases closer toward what the inflow from the compressor is. At 40 PSI in the tires, I can go from a full wet tank to the 90PSI wet tank switch opening...

So you are using the wet tank pressure switches 115 PSI closed to 90 PSI open points to control the inflate timing? I thought about using that switch to control an indicator light on my manual panel to indicate wet tank pressure, but I find I can do it prettywell by ear. Dryer purge = full...

I would be curious what safety precautions are written into the code...

My CTIS is bricked(5 solid LED’s) so I am working on a electric over pneumatic manual control right now. It should be very do-able with a programmable microprocessor. The hardest part will be interfacing and interpreting the speed and pressure transducer signals. IMO, Nothing fancy in the...