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No VIM on a wtec3, they separated the TCU from the controller on the 3 and put the TCU in that same place under the passenger dash… They moved the relay functions provided by the VIM up into the main power panel…

so TCU under the passenger dash or the wiring between the two?

well if it won't even enter diag mode, it sounds as if the pushbutton controller and TCU are not communicating, so an issue with one or the other or the cables in between... i wonder if Allison doc or a scantool can talk to the TCU?

What year truck? this is a WTEC3 controller. This looks like it is missing something major for basic operation. The system gets battery voltage all the time, and switched ignition power to activate. Are both these present(2 separate fuses/breakers). Next would be to check interconnect...

When I was young and learning to ski, my brother, a ski instructor, once told me, "if you are not falling down, you are not learning anything"... Applicable wisdom to a lot more than skiing...

I believe it is txv and the valve is in the evap unit…

The tank vent typically runs up to the cab suspension arch and is loosley folded over and zip tied with the latch hydraulic line. on the A0 they use an electric pressure sensor for the pri and sec gauges. It also incorporates the low air switch set for ~85PSI the park/emergency lights in the...

electrically controlled/electronic transmission, so the power system must be correct for proper operation. clean all the connections between batts and power panel. The grounds are trash on al these vehicles. Clean all the grounds... starter to drivers frame, alt to frame, cab to frame...

nevermind

Well beyond the wiring, engine and ABS they are basically the same truck, and the A1 and A1R electrical drawings are also available here in the TM sections… the core mechanical info for chassis, transmission and axles are pretty-much the same(A1R uses high pinion rear axles)… The military...

I missed the zero ohms report...

if you unscrew the nut you can lift the coil and cover off of the valve core to look for a P/N. the whole core should unscrew from the valve block to access the actual solenoid valve seat to confirm if it is free and clear to move. Did you measure coil resistance on any of these... they are...

you can leave ground connected to the truck, but disconnect AND INSULATE the terminals on the 14, 28 and E terminal cables. Connect one jumper cable lead from alt gnd terminal to - on your 24v test battery connect a second jumper cable lead from the 14V alt terminal to the middle of your 24V...

What general said. If i recall from the neihoff troubleshooting manual, the E terminal input only needs to be above 21V . It comes from relay k11 pin 87A(de-energized contact) in the panel. K11 de-energizes to power/enable the regulator E terminal once you see 15PSI of oil pressure. The...

did you pull the bottom plastic cover of the PCU and confirm the wiring inside?

have you confirmed it is indeed a bad solenoid coil? the PCU connector on mine is jammed up against the structure, and if yours is also, you could be experiencing a wiring issues for the control solenoid circuit at the PCU or somewhere else in the dash, and not necessarily a bad coil. beyond...

yea that sounds about right. after you went to sand it went back to its programmed highway pressure.

Yea 5 solids is a dead controller. Should be able to simply power down and plug in the new one. Make sure the ground connection at the bottom case bolt is good… CTIS usually has issues with air leakage, and since it is trying to control the air bombs we call tires with a pressure gauge and a...

The PPD isn’t an issue as the only current that goes thru it, is the current consumed by the truck via the dash power panel and that only changes if you add load… the PPD does serve as a tie point between alternator and batteries, but the 14 and 28 volt leads from alt and batteries are simply...

Looks like a crimp blank that mis-fired? there are pass-thru ports with rubber covers in them for all the cab wiring just down each side of the engine tunnel at the front, both left and right...