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Carefully going through the trouble shooting guide again, I'm seeing the PCU Sensor as a possible cause. This is the little square sensor on top of the PCU. I can't find anything that says how to test this sensor without the computer or having a replacement sensor.

I had 48 ohms and continuity on them all. It's almost instant on the 5 light flash. When I first got the truck it worked fine, then it started making a real fast "click-click-click-click". If I pushed any mode button it would stop clicking for a little while and work normally. Then one day...

I just ordered 3 of the solenoids from PLCcenter.com. Both times I took apart the PCU the same valve was open. I know it was clean and moved freely. I'm hoping it's the solenoid for that valve that's acting up, even though it's testing OK. As soon as the truck hits the 120 PSI and the CTIS...

That switch is OK. The system turns on right at 120 PSI. The one I'm concerned about is the little square switch that screws into the top of the PCU. It has a 3 wire plug on it.

Thanks for the info. The continuity checked OK on all of mine. They were all right around 48 Ohms, so I'm assuming they are OK and my problem must be elsewhere. Still don't know how to test to pressure transducer and if it could be causing my issue.