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If the gages are correct, 95 psi is not enough to activate the ctis initial self check.
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I'll check the pressure at the air tank today. The last tank has an air fitting on it, I bet it never gets drained properly . I'll then bypass the pressure valve and see if that kicks the CTIS on. But I have suspicions since I don't even have to start the truck for the fault to show up.If the gages are correct, 95 psi is not enough to activate the ctis initial self check.
I noticed the exact same thing today. I would push the master Power switch and after a few flashes on highway all 5 lights would flash. If I unplug the unit and plug back in. It would again flash highway for a second or 2 and then go into the 5 button routine.
I was thinking of doing something like that myself. definitely something I am going to try now. thx TNIt may not be recommended or condoned, but I took off several hoses from the PCU behind the passenger kick panel and sprayed some silicone lube into the unit. I felt that moisture had made its way in there and corroded things a bit. It seemed to help the solonoids on that unit cycle better for pressure checks and changes. FWIW. YMMV.
I actually made a mistake it's 100psi not 95psiIf the gages are correct, 95 psi is not enough to activate the ctis initial self check.
So if i understand it correctly then every time I would have empty air tanks and turn on the truck it would show an error? because there isn't enough pressure?Still not enough pressure.
Bad ECU that's what I'm thinkingThe system won’t start till around 115 psi. Shouldn’t error for a certain time period from initial start. It knows to give time for the pressure to come up. You should still be able to communicate with it. Could be a bad ecu.
I'll get a new purge valve tomorrow. It keeps blowing without getting the proper pressure. Once I got the new valve in I'll see what kind of pressure I get then. And then maybe see what the governor adjustment would do.You want to see around 125 at governed pressure. As the air is building, once you reach governed pressure, the governor sends an air signal to the unloader valve on the compressor to stop making pressure and also to the air dryer to purge built up moisture out the bottom expello valve. The governor is on the air compressor there is a plastic cap under which is a slotted end threaded rod with a set nut, used to adjust the pressure set. May only take a 1/4 turn to adjust. A clogged up air dryer will cause low pressure also but you may not get the purge from the expello valve since you arent actually reaching the governors pressure setting if this is the case.
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