Where to find cab air ride and fan clutch air system troubleshooting procedures, 2000 M1088A1

[ckouba]

My cab stopped air-riding and the fan stays engaged. I assume they run off the same feed which has been compromised somehow. Having a "fun" time digging through the manuals. Can anyone point me at the proper section of the proper manual?

If there is something which typically craps out which I should look at to start with, or just a general good place to start, please advise.

As always, thanks in advance!

 

[coachgeo]

fan automatically comes on if getting no air to the clutch. So brainstorm, trace air lines for lines that would move air to BOTH air ride and clutch

 

[ckouba]

Yeah, that's what I'll physically be doing shortly, but if there's documentation around for how to solve the issue, I'm ok not re-inventing the wheel.

 

[chucky]

Wouldnt that maybe be a bad relay sending power to the cylinoid behind the p. side kick panel maybe take that panel off and tap that cylinoid with a wrench or such ! Theres videos on youtube at the greatwestern roundup at hellicools hellipad on you tube of lmtv able sean filner fixing/replacing that cylinoid at the festival

 

[chucky]

With your air pressure built up does the passenger dash hiss/ pop off when you flip the main power rocker switch and again when you flip it off ?

 

[chucky]

 

[chucky]

 

[chucky]

 

[ckouba]

Thanks Chucky.

No popping or hissing.

Just pulled the line at the solenoids (2 because its a 108. No air supplied. Starting to trace the feed line backwards.

 

[ckouba]

Problem solved.

Was a bit self-inflicted. I worked on the regulator while chasing leaks and needed to reset it. I used regulated compressor air to get it to open ~90 psi and I'm back in business.

 

[Ronmar]

Problem solved.

Was a bit self-inflicted. I worked on the regulator while chasing leaks and needed to reset it. I used regulated compressor air to get it to open ~90 psi and I'm back in business.

Are u using the original ctis?

 

[ckouba]

That is next on the list of things to tackle.

Actually, it's not next, but it's on the list...

It was working fine until one day it wasn't. I unplugged it to get it home (relays kept cycling like a metronome) and have been working on other things since then. As part of a different project, Brandon (LostChain) walked through the troubleshooting process with me which concluded with bad ECU. Effort was again focused elsewhere, but with that knowledge, I figured I'd grab a controller from Christian and just be done with it.

I did do that, but now upon trying to get it working, well... it isn't. Not the controller, mind you, I believe it's the system. It's unresponsive.

So I still have a few miles to walk down that road, and as I work through other things, it is working its way up the list, but it has yet to make the top step.

Why do you ask? Would a compressor input disturb things?

 

[Ronmar]

The reason I ask? Well CTIS is a slave to the wet tank pressure switch, and that switch interacts with the protection valve setting. There are two types of switches but the only difference is slightly different pressure settings. Basically the switch closes above 117PSI, informing CTIS that the tank is full. It stays closed till around 89PSI, at which time it opens, telling CTIS that the tank has no more air to give. that protection valve needs to close at 85 PSI otherwise the switch will never open and CTIS will never see an empty tank indication from the switch. I think it uses this switch to kind of time/cycle its operation, so it allows the tank to fully fill at intervals so it can recharge the service brake tanks…