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Yes it started on the A1P2

They are threaded. I did not want to include the seat as the kit without the seat would service 10 or so part number wheel valves, with the seat it would only be specific to one or two valves. I can check about making the seat available for LMTV/FMTV

Hello Everyone, I have run into a holdup on the updated wheel valve release so I am perusing a rebuild kit instead. This kit would include a vented cover and protective bracket, new diaphragm good for -30F operation, and screws. The seat and spring would be your responsibility to clean and...

Please keep in mind that software configurations set by the ECU pins M and Z also set fault tolerances for a specific chassis. Selecting an incorrect config could cause pressure reading to be inaccurate, over inflations, or even a flashing light fault to occur. S&S and later models are all wired...

https://www.steelsoldiers.com/threads/spicer-ctis-trouble-shooting-guide.195064/

AXTS0015 Troubleshooting Guide

You can disable the ECU by interrupting the PS Pressure Switch signal or put a 5 amp switch in line with the 24v power wire. The ECU had protections against power surges and very robust. Welding on the chassis with the vehicle power on can cause issues but not jump starting.

The only light for CTIS on the dash is the overspeed warning light. It should flash if the truck speed is exceeding the limit for the tire pressures and be on solid if the speed signal is no longer present after 50 key cycles. It will turn off as soon as the ECU sees a speed signal. Attaching a...

Most Trucks that have a CTIS disable switch for an arctic kit use the pressure switch wire. This way is can be disabled before start up and easily engaged after running down the road and the seals are warmed up. Take either with at the the switch, cut and splice two wires, then run them up to a...

Old wheel valves can be a problem and they will perform worse when it is colder out. Just take it apart and clean everything good. Remove any corrosion from the stainless seat and use a lightweight oil to soften the rubber diaphragm.

The PCU will handle 140 PSI so it is not a problem. When using switched you have inflating is easy, just turn on "Control" then "Supply" and air will flow into the tires if the supply is higher than the tires. NOTE* If the supply is lower than the tires, the tires will deflate down to the...

You do not need the ECU to control the system. There is a switch box diagram on one of the other posts. The PCU has the deflation relief valve that controls the line pressure at 8psi allowing the wheel valves to dump. You also do not want to turn on "supply" without turning on the "control"...

Sounds like the switch is bad. You could take the metal bezel off and use a razor knife to cut around 3 sides of the button then peel the cover back and see if you can clean the contacts. The metal dome will come out and you could use a metal clip to short the contact and make sure they work. If...

This switch box is for Troubleshooting CTI system issues only it is not intended for vehicle operation. * * * MY DISCLAIMER * * * Note that inflating and deflating past the normal software values will cause the system to malfunction and could be Dangerous! Follow the 2018 CTIS Troubleshooting...

There is something you can do to replace the ECU completely. Build a switch box with power and ground wires to the truck, connect power to one side of the switches and the other side out to the PCU solenoids. Bring the PCU ground wires back to the switch box ground. (Supply) (Control) (Deflate)...

If all the CTIS lights are on solid the ECU is bad. I am not aware of a bad ECU drawing enough current to trip a breaker but I would think the harness to the ECU would be warm. You may also hear a spark when disconnecting and reconnecting a live ECU if that much current was present.

When the pressure switch opens, the system is put in a "Hold" state; if it is pressurized, it will vent after 30 seconds and wait for the switch to close. If you brake the signal wire from the switch to the ECU and run it up to a switch on the dash you have created a disable switch. The only...

I thought this information might be helpful to others I do not know of any way to fix an ECU that is not responding normally. If the internal power supply is good and the micro is trying to boot but will not checksum there is no fix. The only issue that may be fixable is a stuck keypad button. I...

You sure can make the changes; But if the PCU has a 12 psi relief valve, the system will not deflate below 14 psi so setting the emergency pressure to 10 will not work. Setting the tire pressure to 100 will not work. Setting the overs peed's too high could be dangerous.

CTIS ECUs can have as many as 8 different variants stored in them. Depending on how Pins (Z) and (M) are wired (High, Float, or Ground) The ECU will load the parameters on power up. (Float Float) may be set for a 4x4 and (High, Gnd) may be set for a 6x6 Heavy. There other parameters in these...