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Tried to deleteI asked about the FMTV "Y" cable last week and received the attached wiring diagram. Can't answer whether the cable is the same for the M939A2 and FMTV.
Sorry, I didn't get this posted to the group earlier.
View attachment 676913
The drawing is for an LMTV harness only but the Configuration wires will put the ECU into the wrong configuration. If you want to use this drawing the two config wires should go straight through with no splices. If you have a truck with a black CTIS ECU the communication wires are most likely hooked up to the vehicle diagnostic bus 9 way connector by the drivers leg. So the "Y" cable is not needed. Valves dumping air after reaching the Highway pressure....I found a PCU vent (in the cover) partially plugged, just remove the vent and re-check.I asked about the FMTV "Y" cable last week and received the attached wiring diagram. Can't answer whether the cable is the same for the M939A2 and FMTV.
Sorry, I didn't get this posted to the group earlier.
View attachment 676913
The system will check the tire pressure every 15 minutes. But in the cold the wheel valves may have trouble closing after the check, then the system begins inflation cycling back up to the the highway target pressure denoted by the terrain light blinking continually. The vent screw in the WV covers is there to correct the extreme cold effect on the valve.We will see I think its about every half hour It checks pressure.
Here is a link to the service manual; AXTS-0015I'm having similar problems with CTIS. Tried 3 controllers with 2 that flash all 5 red and one nothing! Any help for a novice would be appreciated!
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