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I would say if you're off-road >50% of the time it is worth keeping. The biggest problem that I see with it is the long increase from cross-country to highway modes and the stress that places on the truck's air system.
See my third post. Inflate all of the tires to the same pressure (30psi is enough) and try to run the CTIS unit without pressing any buttons. If they deflate, most likely a hub seal is to blame. If you get five lights, you have a large leak upstream of the wheel valves that needs to be fixed...
The button selector is the "brains" of the system. The unit on the floor is the valve body, and the small black box with connector above it is the pressure sensor/ transducer. Based on your description of the problem, you won't find the solution there.
The troubleshooting guide I edited into...
You're right about the o-ring on the front hub adapter. That's an extra that I had lying around. As for your situation, what lights are you getting on the controller?
IV) Theory of operation (based on my observation and the P2P program)
When the CTIS is first turned on and there is more than ~100psi in the wet tank, the controller will pressurize the control line to check the pressure of the lowest tire and do a leak detect. Leak-detect works (I think) by...
III) The hub seals
One of my hub seals was not fully seated properly and was causing all of the tires to deflate through their QRVs. When this failure happens, the leaking seal may hold air at 15psi, but not much more than that. When that happens, the control line (CTIS side of the QRV) is...
II) The Quick Release Valve
This was the most convenient part to replace, but is also the least likely to fail. While it doesn't look the same, it is functionally the same as a Bendix QR1 valve with 1/2" inlet and 3/8 outlet. Mounts are the same too. The Bendix valves are nice because they...
So some folks asked me to outline the things I discovered while rebuilding my CTIS and what function each part performs, so here goes…
Preface:
Clean and dry air is essential to the CTIS’ performance. It would be wise to service the Haldex air dryer under the truck before attempting to restore...
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