CTIS highway light continuously flashes

[Illgetyou22]

I have a issue with my CTIS, I went through the TMs and wasn't able to find a identical trouble shooting to the problem I am having maybe some else here has seen this. I start my truck and right off the bat the light is flashing for highway without me pressing it. I have ran the truck for 30-45 mins and the highway light continues to flash. I checked for leaks and found one in cab and fixed it (connection was loose) then repeated the process and got the same result. I've have searched through the forums and came up with no results.

 

[1 Patriot-of-many]

It starts trying to air up the tires at startup, thats normal. I If it never stops flashing then it never achieves filling them up. Another leak somewhere most likely.

 

[RustyM923]

Break out the soap and water. Sounds like you have a leak somewhere.

 

[MtnSnow]

This might help ya in CTIS troubleshooting

 

[5tonman1971]

My m925a2 does the same thing sometimes it will flash for about 25-30 minutes then goes solid. Then some times the hwy and xc lights will stay solid. But it works really well and fills the tires really quick.

 

[jwaller]

Check and fill each tire manually and unplug the controller. Plug it back in and start the truck.

 

[Hawssie]

It can take some time to fill up all 6 tires at once, depending on starting pressure and at what rpm and the duration the engine has run. It also depends CTIS system will open up the truck's air supply to the tires after it hits around 120 then it will continue filling unless or until the truck's air pressure drops below 90 psi. Then it will stop filling up and wait for the pressure to recover to 120 psi again and then repeats this cycle until CTIS pressure either reaches 70 PSI or if there is a leak, until the leak gets too bad then it will shut down and do the "5 blinkys". So as you can you see, if you have no leaks in the CTIS but leaks in the rest of the system it will still cause a slow to almost no fill up. Leaks in the CTIS just compound the problem. I ended up putting an air pressure gauge on the outgoing line from PCU. That way when the system is in fill up mode I can visually see what pressure it has currently reached. BY watching this gauge and the other two it gives you a visual look into what the CTIS system is doing. Its not necessary but it is helpful.

 

[Hawssie]

Skip the first reply!

It can take some time to fill up all 6 tires at once, depending on the CTIS starting pressure and at what rpm and duration the engine has run at. You can get some idea by watching the stock gauges to see how fast your trucks air pressure is recovering while in fill up mode. The CTIS system will open up the trucks air supply to the tires after the trucks supply hits around 120 then it will continue filling unless or until the trucks air pressure drops below 90 psi. Then it will stop and wait for the trucks air supply to recover back up to 120 psi and repeat this cycle until the CTIS either reaches 70 PSI or if there is a leak, until the leak gets too bad, then it will shut down itself and do the "5 blinkys". So as you can you see, if you have no leaks in the CTIS but leaks in the rest of the system it will still cause a slow fill up. Leaks in the CTIS just compound the problem, and visa versa. I ended up putting an air pressure gauge on the outgoing line from PCU. That way when the system is in fill up mode I can visually see what pressure it has currently reached. BY watching this gauge and the other two it gives you a visual look into what the CTIS system is doing. Its not necessary but it is helpful.

 

[awind]

Could you tell me if you fixed your CTIS light flashing, if so what was the problem?

 

[Coffey1]

Also if a tire is way lower than all the rest it should fault.
I have to hit run flat on mine some times and it will bring it up then go to flashing hwy then to solid.

 

[Andyrv6av8r]

I had the same problem on my newly acquired 932A2. I tuned my governor up to 125 psi and it has worked perfectly ever since.

 

[Tatsnboots]

I had the same problem on my newly acquired 932A2. I tuned my governor up to 125 psi and it has worked perfectly ever since.

How and where do I go about turning up said governor?

 

[Andyrv6av8r]

How and where do I go about turning up said governor?

939 Air Compressor Governor Advice

And before it comes in: yes I did a search (939-air-compressor-governor-adjustment) and yes I read the TM -24 (1st section) PG 3-576 I believe. I found threads discussing turning up the pressure but no instructions on how they did it. The governor in the TM does not look like the governor on...

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