Search results

Yup, exactly what I did.

Ctis If you connect the 2 terminals at the tank you are in effect sending a closed switch signal. This the section of the CTIS harness to the PCU. The electrical TM would be helpful in running a pin to pin continuity check of the harness.

Well..... wiggle the CTIS harness and the lights start flashing on the controller... time for a new harness methinks...

http://maintenanceprocedures.tpub.com/TM-9-2320-366-20-3/index.htm Good info on CTIS in here... Not giving up just yet.

Replaced the PCU with one from a working CTIS - from NV555. Also installed the new Purest air dryer. CTIS flashes all 5 until wet tank switch closes, then goes to solid HWY. Pressing SAND the mode light comes on but nothing happens, same as before the PCU swap.

The problem with 2 coils reading to the same pins is you don't know if both are good, or which is bad.

Well, back OT... while my new fan clutch hose is being made. I removed the PCU from the truck to find it dusty but no sign of oil etc. Removing the cover revealed a pristine unit. Proceeded to test the solenoids but was a little confused at the markings in the plug not matching the schematic...

Not sure that I agree. Under "current conflict vehicles" there are a number of "folders". It would simply require adding a "CTIS" one.

Tennmogger, Thanks for the additional info. Its interesting that you mentioned the fan clutch since I heard a new air leak yesterday when just turning power on, but not starting. Turned out the last motorpool guy had tightened the bottom fitting so the hose was rubbing. It finally wore...

What voltage are the solenoids?

No deflation CTIS It sounds like his CTIS is doing the same as mine. Today I checked the tank pressure switch and when the gauges read 120psi the switch is closed. I removed the front QRV and with the truck running and CTIS on "HWY" there is no air coming out of the feed hose. There is...

OK, to keep things in a similar thread... My CTIS controller has no flashing error lights. The air appears to be at 120 on both gauges (haven't checked the tanks). When I switch from HWY to SAND nothing happens except the light on the display. The tires were manually inflated to 55psi, and all...