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I would re-test with a 0-500 psi gauge. You might have pressure but it's a little on the low side and that gauge is having trouble registering that low of a value.... The solenoid..... tough call without knowing it's construction. It's a purpose-built PWM solenoid. In any case if you don't...

That is just the request circuit and the indicator lamp circuit. The clutch pack solenoid is not in that diagram. I think you are mistaking the "Diff Clutch" item as a solenoid, but the wiring to that device says "Differential Clutch Indicator" *- which I'm not sure if that is optional and our...

Dielectric greases are great for keeping contaminates out, but less than ideal to promote good contact. They usually aren't a *problem* and usually do more good than harm but occasionally someone will report issues.... They are non-conductive so they don't help the connection they just keep out...

It's not "AC" in the sense of a mechanically generated AC waveform that people think of when they think AC from the wall. By switching the DMM over to AC coupling you are just telling it that it's looking at an oscillating signal and using various methods - RMS (Root Mean Squared) being the...

Yes, you would use the oscilloscope with the solenoid plugged in. (y)

I keep one of these on my truck. They have been reviewed by quite a few electronics repair YouTube channels and are a decent option for price/performance, convenience, etc: https://www.aliexpress.com/item/3256806215255892.html You can find them on Amazon also. "Zoyi 703S"

I've seen the bulkhead transmission harness connector incorrectly pinned from the factory - either the truck came that way or the ladies at the Motorpool swapped in a replacement harness that was pinned incorrectly. Also apparently that area is prone to wire insulation degradation and...

I'm not following how the resistance could be *lower* measured through the harness versus directly at the solenoid. The wiring should not be able to lower the resistance reading. And resistance measurements (with a DMM for example) are not really appropriate for measuring the circuit resistance...

No pressure at the test port either means the solenoid is bad or it's not being activated correctly. (Or you really don't have pressure but since the truck drives that seems unlikely). The small movement you are seeing could be the "peak" from the peak and hold PWM signal from the TCU and the...

Interesting that they use the peak and hold PWM control style. I wonder if these low impedance solenoids are considered a more reliable component. The consumer side of things - injectors and most valve body control solenoids in automotive - are generally high impedance since the late 1990's...

Maybe it only changes to the 50/50 PWM scheme at a specific throttle percentage? :unsure: Definitely scope time.

Which I believe is just a fancy/generic way of saying -4 ORB. Looks like ORB will work unless the o-ring chamfer isn't correct to provide the seal. Appendix B of the troubleshooting manual. Found it here...

Have you checked the transmission drain plug magnets and the scavenge line screens etc? I mean - the propensity for thrust bearing failures on these is the most obvious and likely scenario. Which would likely loosen up the clutch pack to the point where it couldn't engage even with good...