If anything is partaking / disengaging effectively, I can’t see it becoming a difficulty as a temporary repair. Needless to say, I wouldn’t endorse it as being a everlasting take care of (gotta say it!).
Just A fast Notice… if your method only engages 50 percent way and kicks out, it can even be caused by “plastic†bushings within the transfer situation that have on out.
Hmmm… my initially assumed is that it's a wiring trouble. Why? Simply because you could show which the program operates by putting it into 4Lo. If you will get the program into 4Lo, that tells me the TCCM is Doing the job (or at the least the 4Lo portion is), the encoder motor is Doing work, plus the vacuum is Doing work (the front hub is engaging — the vacuum change and diaphram are Operating). I’d Check out the wires are the TCCM to start with, then probably the encoder motor up coming.
One other wire I would Verify could well be the A/T (Automated Transmission) shift lock switch — This really is wire #31 and it is light inexperienced using a black stripe (you'll find extra internet pages of your schematics earlier mentioned… the very first can be a hand -created website page of the TCCM connector pinout). This wire must have voltage applied to it at specific instances — sad to say, I haven't had to diagnose that Section of the method, so I don’t know if it should be +5VDC or +12VDC (but it will be one of them!
Very first, your tranny will not likely shift into 4Lo at 60 MPH — it is actually designed to change ONLY if the transmission reaches speeds of 3MPH (5KM/H) or Considerably less. The flashing signifies that the TCCM is trying to change from 2/4Hi to 4Lo, however it are unable to due to the pace at this time being traveled (for this reason why it went into 4Lo for your wife at the vehicle wash) — it is going to flash for thirty seconds (I feel it’s thirty seconds) after which revert back again on the manner it absolutely was previous in (ie.
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Now, There exists a sensor over the front, proper hub to detect when it really is engaged — I haven't tried out this, so I don’t know a hundred% of course, but if the front, right hub will not be partaking, the method ought to detect this instead of enter 4WD.
If I’m not mistaken 1999 and back, the vacuum change is in addition to the transfer case. 2000 and up it’s around the firewall. If it’s along with the TC, it looks like a nut with three hoses sprouting from it.
The first thing I'd Test is definitely the 4Hi gentle — (retain it straightforward) — does the 4Hi mild ever arrive on?
Sad to say, I haven't experienced expertise with your distinct dilemma — but it really does seem like it may possibly certainly be a) a similar challenge as I used to be obtaining (ie. internal gears / forks on the transfer scenario not making it possible for entire shifting from 1 mode to one other), or b) a front axle swap dilemma (which is situated inside the Ability Handle Module (PCM) — but that’s about all I can assist you Along with the PCM as I don’t even know where it’s located).
Superior luck, and let me know what you find — within the hope that it'll assist some other person down the road.
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I even now don’t have pictures however, I’ve just been fast paced with a huge amount of things right now — but I'm able to go in excess of a few things for you to Look at/do.
Could minimal fluid induce a difficulty? Sure. You don’t have to replace your fluid if it’s lower — just best it nearly the appropriate volume. Having said that, I’d be asking myself WHY it’s very low.