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Check in the engine by the washer bottle. There's a black box there. That might be the issue. Protective control box (pcb).

If your PCU is clicking and air is moving at all, then it's unlikely to be an issue there. It seems more likely to be the pressure transducer on top of the PCU or an air leak or obstruction. If something is clogging an air line the CTIS will shut down.

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

Part NSN Inner Hub Seal 5330-01-271-9410 CTIS Hub Seal 5330-01-272-1147 Outer CTIS Hub Seal 5330-01-308-0175 Axle Flange Gasket 5330-01-377-9775 If you have a leaking hub, these are what you'll most likely need. For most smaller o-rings, you can usually get a decent box of mixed...

Most of the stuff you can find on eBay or surplus dealers. The ECU is hard to come by though. The PCU can be rebuilt with new solenoids and o-rings. Not much else in there to go bad. What parts do you need?

Installed new troop seats.

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.

Glad my info helped.

If it was leaking, it is still leaking. Before tearing apart the PCU I would replace the o-ring.

I just kept the same orientation with the wires. I don't believe it matters though. Were you able to get 30~80 ohms on each of the pin sets? If you did, your solenoids should be good. If it's running air through the PCU then going to 5 lights that should mean you have a major air leak after the...

Might not have the right version. Using the guide I was able to easily diagnose 2 dead solenoids.

5 solid lights is a DEAD ECU. No coming back. Here's the rest according to the manual: 5 Lights Flashing System shuts off at least one channel due to fault detection on a CTIS component. System closes wheel valves. System may periodically cycle PCU to determine if fault still exists. On...

It would be nice if 5 lights blinking didn't indicate either an electrical issue or pneumatic.

Oddly I have the same muffler. Domed out on the top and bottom. Water will still pool in the muffler and rust it out. This is due to the angle the muffler sits at. Always best to not get water in there in the 1st place.

Can we get some pics of this?

More than 1 light at a time is generally bad. When the truck starts highway should flash. When the truck reaches 120psi, if all is well, you'll hear clicks and pops and the system will do a tire pressure check. If it's low it will keep flashing highway and fill. When complete highway will go...

5 flashing is an electrical issue or not enough pressure to operate. The ctis will not turn on at that point. I think 4 flashing is fixed by the run flat selection. Do you hear clicking from the controller on the cab floor? If there's no sounds, it's probably electrical.

5 lights flashing, 5 lights solid, or something else?