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They are all connected, I wouldn't be surprised if you have some valve stem cores in your rear wheels.

Just to update, since adjusting the pcu relief valve the system has been working perfectly for the last couple weeks.

Mine is a 2007 and all 6 had a fair amount of corrosion, but they cleaned up really nicely. I was only having one with a leak down issue but I would rebuild all of them. They are really pretty easy.

It's states in the spicer manual troubleshooting this error, if the relief pressure is "within 1 PSI". Of course who knows what the true target is and also the allowable variance.

Found out that the sensor is reading correctly. So I took apart the relief valve put in a slightly larger o-ring that seals on the surface a little better it seems, and also burned off the adhesive on the adjuster screw and tightened it up a bit to add more spring pressure. Now I'm getting a...

Tried tonight but there is a pressure spike that was blowing the hose off so I need to change the setup a little to take that spike. I did push on the relief valve to increase the pressure and the quick release started making a very loud whistle. Can't imagine that is correct.

Yes I've rebuilt them all now. Fair amount of corrosion although it completely came off with a brass wire wheel, but all filters looked pristine. Did the soapy spray and no apparent leaks now.

Big IF is if the pressure sensor is accurate.

Haven't found any actual manufacturer specs on the pressure sensor. So I picked up a Dearborn interface. Pretty nice software that Spicer made for the CTIS. Atmospheric pressure is reading 14.0 and it should be reading about 14.6 per my location. On deflation is reading about 5.5 PSI and it...

Checked the sensor, had some gunk, also inspected all orings in the PCU. Reassembled everything and same error. Did check the relief valve while functioning and it appears to be correct as pushing or pulling on the plunger resulted in less dump valve air release. One time the controller...

Unfortunately without sensor specifications I'm guessing on proper sensor voltage. Heck the 0-150 sensor is .5-4.5V for the recommended versions. Being that my sensor does inflate the tires to 55psi on highway that makes me think it may be okay but it's possible low pressure readings are not...

Wonder if the CTIS unit I bought is programmed for a different relief pressure? Anyone know what that additional sticker means? This was for an lmtv and I have a MTV so there are 3 dump valves vs 2....wonder if there is a programming difference causing the issue.

For sure on proper input. I tapped the wires so reference voltage was being supplied by the controller.

Do you know if that sensor is gauge pressure or atmospheric? I get .553V with no pressure in the system, truck off. If atmospheric I should have .739V for my elevation. If gauge, that means there could be pressure on the sensor, faulty sensor, or we don't have the correct scale for the sensor...

Awesome, that give me a few things to check out. No I didn't remove the sensor but knowing that data I can bench test it. I know I have some very small leaks on the wheel valves I haven't rebuilt but they are very slow (tiny bubbles slowly forming).

Checked the relief took it off and manipulated it, it's in great shape, no clogs, moves freely. The system does deflate the tires quite quickly and quick release valves seem to work as intended. 1) Faulty PCU relief valve - Checked and as far as I can tell this is good to go. 2) Leaking upper...

Getting a new software and hardware to do that is on my list of things to do, still waiting for my title and registration to process through before I spend more money though

It does sound like it's working properly, the controller just doesn't like that a pressure is slightly out of bounds on the relief valve. Atleast my best guess at this point. Manually actuating all the solenoids, all are functioning properly best I can tell.

My truck didn't come with a CTIS controller but I found a "probably broken-untested". Plugging it in and it seems to work as it should, electrically at least. I had a missing quick release valve for the front axle, then both hub breathers were disconnected, then found a hub seal leak, then the...