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Leaking air is always the best bet. If the system detected a leak it will go to 5 lights.

Generally, if you have an air leak, you will hear something from the PCU. To detect an air leak, it has to at least try. If you have an electrical issue, the PCU will never make a sound. By what I've seen, the most common electrical issues are a dead ECU (5 solid lights or no lights) or a dead...

RedBlok, When you start the truck, does the CTIS selector blink highway? One you reach 120psi, does it go to 5 lights without making any clicking noises in the PCU?

When the CTIS s flashing 5 lights it has detected a major electrical or pneumatic fault and it shuts down completely. It will neither inflate or deflate. Arcing in your battery box could definitely fry components in your truck. Might need to check wires, fuses, and whatnot.

I was able to get in there this morning and check the resistance on the PCU solenoid connector. A-E deflate is good at ~45. Both B-D control and A-F supply give 0.L readings so it looks like I'm in the market for 2 solenoids. From other threads on here, it looks like a Peter Paul 5C-13-K24 PPF...

Finger over the outlet builds up no pressure. I also stuffed some paper towel into the outlet. It doesn't get blown out. Even 5 psi would have popped it out. No air is leaving the PCU at all. The TM troubleshooting says to replace the PCU. Wet tank pressure switch is good. 120psi reaching PCU...

I've read through the guide. I just don't have a code reader so I don't know the error code. If the outlet from the PCU is disconnected there should be some air coming out the PCU before it goes to 5 lights, shouldn't it?

I have not checked the wheels yet, but if I recall I've aired them from the wheel valves before. I'll have to double check. Im fairly certain thar isnt the issue though. The system never sends any air out from the PCU. With the outlet line disconnected, no air is released. I disconnected the...

Well, I tested the air line to the PCU and got 120+ psi. I ran it with the output line, pressure relief, and PCU pressure sensor all disconnected, but not one bit of air come out. As soon as the dash gauges read 120+ psi, 5 lights came on. Definitely seems electrical.

When I put pressure in the output line the front axle valve just blows air out the duckbill. That defiantly doesn't happen with everything hooked up normally. I'm going to try putting a gauge on the input line to see what pressure is reaching it.

There is air, yes. Not sure on the pressure. What psi should be going into the body?

I've been working on mine today. I get no air noise in the cab at all from the pneumatic controller. Once the system is up to pressure, it goes to 5 blinking lights without even doing anything. I fear my pneumatic controller is caput. Is there a way to test one? I don't have a spare to try and...