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Thats been the most common problem with our trucks. Even when they're really clean they still come loose with time. Tested for leaks just like Suprman said. Eliminated all of those. Think the last thing left to go wrong is the wiring?

Yeah, all the parts I swapped are operable. Thinking I might need to check for continuity between the PCU and brain?

1 Patriot-of-many Thanks for posting. Read through the trouble shooting pdf awhile back. Wish I had the diagnostic tool! Is the PCU sensor what the TM calls the "pressure transducer"? If so, I already replaced that when swapping out the pneumatic controller. Its my understanding that when...

Yes, but the air is coming out so slowly. On my other trucks, there is a much larger burst of air. You can also hear the difference between this truck and others. The one I'm having issues with does not "click" as loudly when the CTIS engages.

Catch trap clean as a whistle, and yes, swapped controllers, but thats good to know for the future.

After unscrewing the output line of the pneumatic controller. There is a MUCH lower volume of air flowing than an operational system.

Verified there are no leaks after the pneumatic controller. aztec, the easy way to do that is by unthreading the output line from the controller and pressurizing with a remote air source. Have a helper spray soapy water. If that checks out, unscrew the output line on the pneumatic controller...

I've hit a bit of a wall. Got 5 flashing lights on my CTIS, and after tracking down all the leaks (there were a few) the system still defaults once the system runs its first pressure check, and tries to inflate. What I'm experiencing is the following: When the system cycles on, the pneumatic...