Search results

Putting a pressure guage inline after the water trap is an excellent idea. My system is working fine, but it still chatters when inflating. I'm wondering if I don't have a clogged line somewhere.

Are you referring to the governor on the firewall? That doesn't govern air pressure to the CTIS. It governs the air sent to the wet tank, by cycling the compressor unloader valve. It also signals the air dryer valve to expel. It is set around 125 PSI. Some have raised it a bit to help the CTIS...

http://www.steelsoldiers.com/showthread.php?137569-M939A2-CTIS-PCU-solenoid-replacement&highlight=solenoid+replaceent Here's a good thread on it. That's where I got mine. Unfortunately, due to my screwed up methodology I don't know if it was the solenoids, the PCU sensor, or the leaking...

Well I went ahead and replaced the solenoids with the new ones. Had the same results, straight to 5 light flash. Now for the really dumb thing I did. When I first took the PCU apart and cleaned it (weeks ago), I removed the 3 solenoids. I failed to note which one went where. So I looked in...

I actually have 3 new solenoids on my desk. The ones in the PCU all tested OK on continuity and resistance, though. I don't know if they could be bad even if those tests were OK?

Nope, new PCU sensor didn't fix it.

I just ordered a sensor from Those Military Guys. Suprman told me he has good used PCUs. I'm hoping it's just the sensor itself and not the entire PCU. Check the continuity from the connectors on the PCU back to the ECU connector. I've been told numerous times there is a propensity for the...

Found a PCU sensor. I guess I'll know here in a few days if that was it.

I went through the troubleshooting guide again step by step. I checked every single electrical connection checking for continuity and shorts. I finally got to the section on checking the PCU sensor. Everything is pointing to the sensor being bad. Of course, it says if it fails the tests...

Should that little pressure relief valve on the side of the PCU open right away? I took the cover off the PCU so I could watch it and feel around for leaks when it tries to start. As soon as the system hits 120 PSI the CTIS turns on and tries to work. That little relief valve opens right...

This was the exact symptom I was having before mine quit, and only gives the "5 light flash" error. Did you fix it?