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Well, the brass valve on the PCU has been checked and swapped, so I just ordered a set of filters, though the order may take a few days. I'm going to double-check the wheel valves, I may have tested them while the CTIS was pressuring the tires. But that's an easy test... Thanks for the info...

OK, not 100% operational as hoped. From HWY, if I select XC or SAND, get about 30-40 seconds of pressure coming heavily from both QRVs underneath (verified by crawling underneath and checking both). After the 30-40 seconds, HWY and XC lights come on steady. Press XC or SAND again, another 30-40...

Update - did a temp fix to the brakes, fired up the truck. HWY light flashed for a few minutes, heard air at the tires for a few, then burst of pressure, hissing stopped, HWY light stopped flashing. Success! Sort of - selected SAND mode, SAND started flashing. Got more air hissing, then after a...

Welp, I may have a fully functional CTIS! That is, pending fixing my two right rear air chambers so I can pressurize the air system on the truck. I re-checked wiring and it checked good. Then I found a PCU on flea-bay, in the Memorabilia section! Looked pretty good other than a cracked fitting...

Welp, I did as SuprMan suggested and turned up the compressor governor 1/4 turn. Per the 20-3 TM, counterclockwise from the front of the motor increases pressure. That didn't do a thing. I finally paid attention (too poor to normally pay attention) and realized that my CTIS ECU fails when I...

Thanks all for the info. I'm loath to pull the heater box to run lines, but will take a look and figure something out. I'd still like the automatic system to work, I'm going to try a few more things as remote possibilities before throwing in the towel (and money). I've got a few ideas on...

KISS is good, especially as our LMTVs are already so complex. And I like being able to up the air pressure for highway beyond the CTIS limits. I also asked the following question in the Manual CTIS thread, but this one is more active. Did you have to pull a pair of lines across the cab right to...

"Jinx!"

Found the link to the manual setup: https://www.steelsoldiers.com/showthread.php?152581-Manual-CTIS-Conversion-for-M-1078&highlight=

I've thought long and hard about it. My truck didn't have a CTIS computer in it when I got it, so I spent a few bucks on a used one. I suppose I could turn around and sell it and recoup my money.... Being lazy at the moment - You don't by chance have a good link to the manual system setup? If...

Update on my CTIS problem (two blinks from HWY, then all five flashing) Got the M939A2 parts kit, used everything except one o-ring and the cover plate, everything fit. Total difference in the action of the sleeve valves, they pop back when depressed. However, no change in the original problem...

Vent line is a easy check, can try the PCU without it connected, or just push air through the line from compressor. Thanks for input. Coffey1, also good to know about interchange, will keep that in mind if needs must

Interesting! Though the M939A2 -24P-2 shows two different valves: two of one, one of the other part number. I found a kit on a well-known auction site and ordered same. Will report when I receive it and reassemble. Again,thanks for the support here and there.

Actually, I get two flashes from the HWY light before all five start flashing. I disassembled my PCU this evening with the following results: Used two 12v batteries in series for 24v and tested the three solenoids - all clicked as expected. Shorted my test leads momentarily and got a nice...

A0 - "Classic LMTV" M1081 from Ft. Bragg. Small rear air chambers too, but that's a different post...

double-post double-post - ignore

Thread hijack - CTIS issue... My M1081 didn't have a CTIS ECU in it when I got it last year. I installed one, but system isn't working right (why would I hijack this thread otherwise). I'll have to check when starting the engine normally. But when putting shop air at 125 psi into the Emergency...