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In case anyone is curious about my credentials and I am not trying to brag; I just want to help because I can. I started work for the original supplier of CTIS in their test lab. I moved with the business to the current company that produce this system. I have been the companies only CTIS...

This is partly correct: When the system pressure checks it cannot tell the difference between a low tire and a leak. It will only log a fault if an airline is completely disconnected and the reading is below 5psi. Any reading above 5 psi and it will just assume low tires and start inflating. Run...

The nice thing about the system is that nothing is pressurized when the system is not functioning. Only the tire hose is pressurized so the air seals have a much longer working life.

When the system checks the tire pressure it puts a short pulse of air into the air lines. The wheel valves will open at 6.0 psi and the tire pressure will begin to fill the lower air lines up to the QRVs. The upper air line from the PCU the top of the QRVs is filled by the PCU and acts...

If the system is in a hold until the pressure builds up to > 115, that is a good start. When the switch closes and the pressure check is complete, if the pressure had read correctly the light should go solid. Because it is still flashing while the tires are dumping it must be trying to inflate...

Dana has released an updated CTIS troubleshooting manual. AXTS-0015 http://media.spicerparts.com/media

If the valve looks good and will hold high tire air... While inflating, check for a large leak in the lines from the hub to the QRV, check the axle vent for bad air seals. (more likely) If there is no air leak and the valve is losing air only after the system is shut off, then there is a severe...

The PCU has the Pressure Transducer its function is to measure the atmospheric pressure at start up and will fault out the system if it is out of range or unplugged, second it measures the average tire pressures during a pressure check, third it measures the deflation pressure (relief valve)...

[FONT=Verdana] To determine if the wheel valves are good.... manually inflate all the tires to >5psi above the Highway target. Disconnect the pressure switch. Start the truck and let the supply build up to 125psi. Plug in the pressure switch. If the system checks the tire pressure, goes to a...

Can I delete this post ?

When the ignition is turned on and a fault occurs in just a few seconds, indicates the system had an electrical fault, PCU sensor or solenoid issue. When the system is normal until it check the pressures it indicates it did not like the result of the tire pressure check. If there are no air...

Follow link to the service manual AXTS-0015 Page 3 shows about where the pressure switch is located http://www2.dana.com/expertforms/depdf.aspx?prod=TIMS

Pressure switch is mounted in the wet tank should be a circular connector with 2 or 3 sockets but only 2 are used. Try not to let the switch body twist when removing the connector it will destroy the switch. If the system is inflating or deflating after a button push and you turn the ignition...

If the ECU was damaged by a voltage spike it would be randomly flashing or dead. When the ECU comes up flashing "Highway" it is working fine, if there were an electrical problem it would 5lt fault immediately. If it flashes until the pressure check then 5lt fault, it is a pneumatic issue (large...

The ECU should never start deflating without a button push to a lower setting, unless the keypad has the dreaded tin whisker...But you should see the mode light change. If the mode lite continues to flash "Highway" and the tires won't hold air, it is very cold out, or the PCU is having trouble...

The pressure switch should close at 115psi nominal and open at 85psi nominal. It sounds like the switch may be a little off these settings. Regarding the system cycling, inflation's should be done with the engine at full throttle otherwise the compressor output is very low. If these these things...

Each wheel valve has a screw in the center of the cover. The screw has an 'O ring seal, simply back it our a couple of turns and re-tighten. (*Warning*, don't vent the covers when the system is working) Water is the biggest issue in cold weather so keep the Wet Tank drained and that should help...

I see a lot of posts saying "not an expert" I am the EXPERT and I may regret joining this site but I have a desire to help people. Lets say I helped develop this product for 25 years, and may have even talked to some of you on the phone. Lets get started. These Old systems/ECU's are not able to...