wheel loses air

[Lmtv772]

I am having something odd happening to the ctis. the right front tire loses air, and the cutis doesn't like inflating it. I inflated it using the air hose.
last time it held tire pressure for a week, then for a day and now for an hour, is there a valve that I can adjust the flow to the tire with?
What does this phillips screw in the center of the ctis valve do?
I've cycled the air system a few times , not sure if that helps
Also, what is the procedure to service the dryer?

 

[Lmtv772]

I've seen a thread here that described the wheel valves, but I can't find it anymore.
Does anyone remember that post?

 

[Lmtv772]

So I unbolted that valve and checked out what I could see inside.
Inside there was a load of sand...
... there was a membrane, a metal cup, a spring, the retaining cover and 4 bolts. I blew through the hoses with compressed air and there was more sand coming out. It felt like they ran the CTIS on sand instead of air.
I then put it all together again, and it seemed like it the wheel was holding air. Let's see what it looks like tomorrow.

 

[Blackmagic94]

Does your Ctis flash lights?

 

[Suprman]

Start spraying around with windex see if it's leaking somewhere.

 

[Lmtv772]

Only 1 light was flashing. The tire is holding air now

 

[Blackmagic94]

One light flashing means it's trying to reach the desired tire pressure setting on the box. So most likely hwy mode of 65 psi. One it hits that pressure the light turns solid. Can you hear the air valve open and click?

 

[Lmtv772]

It's done the tire holds air and is being inflated by ctis