Alexsha
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- Cache Valley, UT
I got a few requests for this info so here goes.
My CTIS was doing 5 blinking lights after reaching 120 psi and there were no noises coming from the PCU on the floor. The troubleshooting guide pointed me in the direction of the control solenoids.
To test f this is your issue, disconnect the 6 pin connector on the left side of the PCU. Only 5 pins are used:
Control: B – D
Deflate: A – E
Supply: A – F
You need to measure 30 to 80 ohms across each pair. No reading means that solenoid is dead. I had 2 dead ones so I ordered 3 peter paul 5C13K24 solenoids from plccenter.com. peter Paul is the original manufacturer of the solenoids in the PCU. The only difference is that these new ones will measure 75 ohms and the old ones I think measure 40 or so.
To replace you need to remove the cover from the PCU. 6 Allen screws hold it on. Also remove the but holding the 6 pin connector. The solenoids will be marked S, D, and C so you can identify the dead ones. You'll need to remove the but holding the solenoid on and slide it off the rod. Next, mark or more which wire goes to the left or right on the solenoid. They're not marked and I'm not sure if it makes a difference, but I wanted to get the same orientation. Cut the wires close to the solenoid so you have enough wire to work with. Youll be able to remove the metal cap now. Thatll go on the new solenoid. Then its just splicing in the new solenoid and put it back on the rod. Tighten down the but and you're good to go. Repeat for the next dead solenoids, if any, then put the cover back on.
You should now be thoroughly annoyed by the ctis sound in your cab.
My CTIS was doing 5 blinking lights after reaching 120 psi and there were no noises coming from the PCU on the floor. The troubleshooting guide pointed me in the direction of the control solenoids.
To test f this is your issue, disconnect the 6 pin connector on the left side of the PCU. Only 5 pins are used:
Control: B – D
Deflate: A – E
Supply: A – F
You need to measure 30 to 80 ohms across each pair. No reading means that solenoid is dead. I had 2 dead ones so I ordered 3 peter paul 5C13K24 solenoids from plccenter.com. peter Paul is the original manufacturer of the solenoids in the PCU. The only difference is that these new ones will measure 75 ohms and the old ones I think measure 40 or so.
To replace you need to remove the cover from the PCU. 6 Allen screws hold it on. Also remove the but holding the 6 pin connector. The solenoids will be marked S, D, and C so you can identify the dead ones. You'll need to remove the but holding the solenoid on and slide it off the rod. Next, mark or more which wire goes to the left or right on the solenoid. They're not marked and I'm not sure if it makes a difference, but I wanted to get the same orientation. Cut the wires close to the solenoid so you have enough wire to work with. Youll be able to remove the metal cap now. Thatll go on the new solenoid. Then its just splicing in the new solenoid and put it back on the rod. Tighten down the but and you're good to go. Repeat for the next dead solenoids, if any, then put the cover back on.
You should now be thoroughly annoyed by the ctis sound in your cab.