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There is an air release valve on each axle. The entire system is mechanical once air leaves the valve body cab floor. If the system sends low air pressure to hold each wheel valve open, it will vent out the axle release valves. If the system sends fill pressure and it is significantly reduced...

Air leak at hub causes lower than intended pressure at wheel valves. Holding them open and allowing air to dump instead of filling them.

Siren sound is a bad hub seal.

Turn on your headlights the lights on the controller should come on

I have a valve body from a 2010 rebuild. You need a y cable to adapt the ecu plug to run diagnostics. I am pretty good at troubleshooting the system without the diag though.

That is the valve body. It controls inflate and deflate. Maybe you can get one of the ctis haters to sell you theirs.

Maybe you had a small air leak hissing from the valve body you can just tighten the air connections.

You can take the hose to the valve off the front wheel stem and put in a schrader valve unplug the ecu and its disabled. Thrasher- there is no audible alarm on the ctis just the 5 lights if you heard an alarm it was the parking brake and low air alarm I would definetly check on that if I were...

No weights on rear tires. If you are missing one on a front tire you need to replace it. That will cause your vibration. Post a pic of the wheel you are referring to.

Maybe you have a bent rim. Swap the wheels with the back axle see if the problem moves. Is the spare rim on the truck now I don't believe the spare rim has ctis on it.

The front tires each have a counter weight the rears do not. You need the front counterweight or that vibration can eventually cause wear and damage. Sometimes you have to run the ctis system up and down. Don't go to emergency mode unless you have an air source or glad hand fill hose. If one or...

The tire going low will not be caused by an axle seal. Bring the tire up to full pressure take windex spray the metal tube coming off the rim follow along to the valve spray all joints if no leaks there then it's the valve or the rim seal or the tire seating but the valve will be the most likely...

It sounds like you have an air leak on the fill side. It sounds like the system is trying to check pressure or add pressure and is detecting a leak. Its probably not a wide open leak or you would get all 5 lights flashing. The noise you hear is normal its when the system stops sending pressure...

There is an air feed to the valve body it had 3 air valves in it all are controlled with electric solenoids and it has a pressure sensor on the body. Each wheel has a "semi-one way" air valve so the system can add pressure to the tires and it shouldn't leak back out. I believe there is a air...

Even with the valve body missing your tires should not deflate. Air them all up and listen to see where the air is leaking out. Sometimes the lines are not on tight enough or the need an o ring here and there. If the valves are bad it could be leaking out thru there also. Get some windex and...

Well if you have a ctis control you have an a2. The valve body controls inflation and deflation if it was missing you would have to find one used. You can manually inflate your tires do they go flat over time or hold pressure? There are valves on the rims. You can bypass the wheel valves a...

In the spicer manual it shows a diagnostic port connector. On the passenger side by the door right under the dash are 2 ports one is the large military style vehicle diag port I dont know what the other is but it appears to be to small and not enough pins to be the ctis port. Does anyone know...

I have the tm's and they reference diagrams but I cant find the diagrams

Are you talking about the box on the floor with the cover over it? Will

I am going to dig thru the tm's tomorrow and try to find the ctis diagnostic procedures. Do you know what tm and age they start on some of these tm's are like 800 pages.