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Great to hear, we hope to have some better wheel valve parts coming soon that will solve the old cold temperature issues.

Sorry I don't check the site as often as I should. One scenario I can think of is that the tires were at the highway pressure and then went up due to the heat in the tires. When the system did a pressure check you may not have noticed the highway light flashing for a couple seconds. When the...

The CTIS will only fault out on the pressure check if the pulse of air drops to below 5.0 psi. That is a pretty big leak. Hard to hear with the engine running so hook up shop air and run the system. If you don't have enough pressure >120 psi to close the switch, disconnect and short the harness...

FYI, if you are new to these CTIS threads; I still work for the company who designed and manufactures these systems, 30 years now. 939, LMTV, MTVR, and JLTV. Happy to help those who serve. Air seal leaks; while the system is inflating, check the axle vent tubes for pressure build up. 5 lights...

Sorry need to be more clear. 5 light fault before the pressure check = Electrical short or open, after the pressure check = <5 psi tire pressure reading. If the system starts to inflate or deflate and there is a problem it may take 20 minutes or more for the system to see there is a problem.

You can clean all the parts with a mild solvent. If you then massage the rubber diaphragm with oil it may become playable again and work. You may be able to order the Diaphragm; Dana or Spicer 599805 from a truck parts dealer.

Any blocked air passage could only cause a higher than normal tire pressure reading. If air gets trapped in the system after a Vent, the wheel valves may not close properly and start dumping air.

I apologize, CTIS threads have been slow lately so I do not check as often. Duck bills are not necessary if the CTIS functions on a regular basis. They can be a real problem in very cold temps because they stick shut or or don't open far enough. A system that faults out after a pressure check...

With some creativity you can adapt the FMTV wheel valve to the 939.

Your best bet might be to update the valves and hoses the FMTV version and get rid of that crappy metal tube.

The larger wheels will only be a problem during an inflation. If the compressor output is low such as at idle the system may log a slow inflation fault. Just run the engine at high idle or higher.

The sensor in the wet tank is really just a switch. It should close around 115 psi and open back up when it drops to 85 psi. Even if the switch is closing the wire going back to the ECU may be open. Disconnect the switch and short the pins on the harness side, the PCU should start clicking...

Remove the the duckbills from the the QRVs see if that fixes the issue. They need to be open to properly close the wheel valves. 5 lights on power up; Electrical issue 5 lights after the first pressure check; large air leak, check the axle vents for the seals leaking. 5 lights after the system...

There is a post here that may be helpful for owners having issues with electronic control units. https://www.steelsoldiers.com/showthread.php?162326-LMTV-CTIS-Question/page20

Updated Troubleshooting Guide FMTV Wiring was not correct. Forum: Technical Manualshttps://www.steelsoldiers.com/showthread.php?175911-Central-Tire-Inflation-System-(CTIS)-AXTS-0015-2018

If you are inflating at idle, yes a hub leak can be a problem. It is recommended to inflate at full throttle when possible. If a wheel valves will not close at 28psi the valve diaphragm may be bad but it would have to be really bad or very hard. More likely it could be a restriction in the Hub...

I cannot give advice on behalf of the company I work at for obvious legal reasons but I don't mind using my knowledge of the CTIS product to help everyone here. I have 27 years on all US based military vehicles using the Eaton/#### systems. Mechanical and electronic test lab technician to...

During an inflation check for air coming out the axle vent tubes, this is a hub air seal leak. The engine driven compressor has a very low output at idle so if you can run the engine at WOT when inflating. Wheel valves can be an old diaphragm or rusty seat that can be cleaned and the diaphragm...

If a solenoid is bad or "open" the ECU will fault out and turn off the the led indicators as soon as the ignition is turned on. If the highway led is blinking, when the supply tank reaches 115psi the system should do the first pressure check, if the 5L fault is then active it is because the...

If the CTIS tire hose is not leaking and the tire bead is not leaking check these two places. Remove the control port hose from the wheel valve and cover the port with your hand, no pressure should be building 2-minutes (if pressure is present the WV is problem) disassemble and clean inside...