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My CTIS works! Finally! Out of desperation, I stopped by the National Guard base to pick the brains of the real LMTV mechanics. They said the likely culprit would be the pressure sensor or the QRVs, which you guys have already mentioned. When I was there they happened to be loading a crate...

Thanks I got the tires back to 50psi by disconnecting the CTIS computer and manually inflating. I guess when I ops checked the gladhands the first time I happened to have the parking brake off and did not know that was a requirement because it does work now. I hope you are right (tenmogger)...

I forgot that I could just disconnect the controller and inflate the tires. Trouble is, since I returned from the deployment, I cannot get any air to my gladhands. The TM has pretty good troubleshooting steps for that. Neither the front nor rear gets air now, so the stuck valve is upstream of...

I guess this CTIS does not have a deflation problem after all. After almost a year of not being able to deflate the tires or to figure out why not, I was driving in the rain when the CTIS Overspeed caution came on. The usual three solid lights were still steady on, but the EMER light...

I think you are right to blame the release valves. After going through this discussion, http://www.steelsoldiers.com/showthread.php?152581-Manual-CTIS-Conversion-for-M-1078 I think my CTIS quick release valves might be seized up after a long time without any use when the controller was...

Mine still doesn't deflate. New controller. New wire harness. New manifold valve assy. Very expensive parts but they didn't change anything. I met a guy at the Phoenix MV show who was working on a circuit board which would read the CTIS fault codes without the $700 computer gizmo from...

The schrader valve on the wheel valves can release pressure from the tires, but loosening the screws on the wheel valves does not. i disassembled one of the wheel valve and it looked brand new inside so I doubt it is malfunctioning. i don't know enough about CTIS to list all the possible...

The controller and writing harness are new too. I tried those last Fall.

LMTVs have a Schrader valve as part of the wheel valve assembly. If there were another one in the tire the one on the wheel valve would not release pressure, which mine does. This weekend I replaced the manifold valve assembly with an expensive new one. CTIS still does not deflate and I still...

Is that how the Army mechanics disable the CTIS? I deflated one tire by removing the schrader valve from the wheel valve. If the tire had an additional valve core in the tire I think it would not have deflated then. Should I check each tire? Would one tire with an extra valve shut down the...

The new CTIS control wire harness finally arrived. I was certain I had isolated the problem with the troubleshooting guide, but the new harness did not change a thing. I still have three solid lights. I guess the manifold valve assembly is the next thing to replace, even though the solenoids...

That might work, but at least one of the suspect wires splits into two before the break. Continuity is OK on one side of the split, but not on the other. That's how I figured out that the connector at the CTIS controller must be OK. The break is at or downstream of the split, but either way...

There is another post by a guy in Alaska who had 5 solid lights on his CTIS controller. That was the only information about it I could find on the whole internet and led me to purchase a new control box. Once I put the new one in, the CTIS came to life, hissing and honking. Now I just need to...

I found the electrical fault guide in the TM for "CTIS does not deflate" (table 2-7, fault no. e84) which had really easy steps to check the solenoid and the continuity in the CTIS control wiring. The solenoid was OK. Two of the three wires going to the lower plastic plug on the manifold valve...

OK I'll take the gentle route. The TM has a test for each of the wires going into the unit, although they all appear well-maintained. I just read that this manifold also has the engine fan control in it too. How many solenoids are in this thing? The TM just has troubleshooting and...

Based upon what you guys have told me I am convinced the PCU, or "manifold valve assembly" as it is labeled in the LMTV repair book, is the culprit. I found a simple test for the solenoid on page 2-918.4 of the repair book. Since a fully functioning LMTV contributes to my overall health, I am...

I guess I will squander my next weekend working on that part. Thanks.

Thanks for the help. I reassembled the wheel valve and tried the hammer on the others, but still no pressure release when i loosen the test screws on the wheel valves. CTIS inflated the flat tire. I read somewhere that CITS does not inflate a completely flat tire but maybe that is on other...

Recent LMTV purchase. 5 solid lights on CTIS controller. Replaced controller with new one, now I get 3 solid lights. I followed the TM troubleshooting for 2 solid lights, since that is the closest thing to my problem that is addressed by the TM. Leak checks all OK. All four wheel valves...