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Thanks everyone, hope all of this helps the next person with this or similar situation.

Just remembered….I purchased this CTIS ECU from fleabay 7 years ago.

So…..leave it alone??? Or modify?

I did but it only showed me the last 3 codes. And one of the last things I did while troubleshooting I accidentally left the 6 pin connector off of the solenoids. So those were the codes. I received the PCU rebuild kit, super easy to rebuild put a little oring silicone lubricant on everything...

The Diagnostic cable and software should be here today but the PCU rebuilt kit won’t be here till next week. While waiting to receive the cable to connect to the computer I pulled the PCU out. Took it apart nothing crazy, looked clean. But decided to find enough o-rings at the local hardware...

Thanks everyone for your help, hope you all have a great Christmas, I’ll let y'all know the results.

Not sure brand purchased it from Superman on this forum.

Yes, I actually printed it out. I’m old school and like turning pages. My challenge is going to be using the software. 🤣

So the latest test was a leak down test. With the air lines capped off just before each of the Quick Release Valves I installed a valve stem on the output line from the PCU. Applied 110 psi to the line 5 minutes later it’s still 110 psi. Absolutely no leaks possible but when it’s connected to...

I started by pressurizing the whole system at the PCU port C, when I couldn’t find any leaks I decided to start eliminating sections by capping off the outputs on the dump valves rear first then front still no leaks brought me to where I am currently.

I’ve eliminated the possibility of the dump valves and everything beyond them by capping the lines off just before they enter the dump valves/ Quick Release Valves (QRV).

I’m in Florida currently.

I also have everything necessary to connect to a computer coming in the mail.

Super clean inside everything still had silicone lube on it. Going to get a rebuild kit and pray.

I'll start by referencing an old thread "CTIS 5 flashing lights,No air leaks, no mechanical faults" I posted on that thread a couple months ago but unfortunately didn't get any responses. Probably because everyone that originally were responding to that thread 8 years ago are no longer active. I...