Hmmm… it’s challenging to say — it could be as simple as the encoder motor sign traces currently being corroded/harmed (Test the schematics in the primary article), or it could be the transfer situation alone. If your lights do the job as they must, then this tells me the 4WD program is partaking, executing what it must. I suspect the transfer case will not be shifting effectively. As I explained into a poster previously mentioned, it might be time to get your transfer scenario checked by a tranny shop.
It’s actually not easy to explain to without having with the ability to put my arms on it. However, you may also want to check the encoder motor sign strains (C26 by way of C28 on the pinout from the main publish) — they need to be large (+5VDC) in the event the will not be in use (resistors pull the traces high), and lower when they are active (known as “Energetic smallâ€). All schematics are posted in the 1st post of this thread.
As I have said again and again within the a few internet pages of this write-up… all the things which i understand about the Chevy 4WD system continues to be posted right here. I have no further info to offer. I'm not a mechanic.
The TCCM is Operating, the encoder motor is Functioning, the entrance, suitable axle is partaking, plus your vacuum strains are Doing the job (you will discover a lot more, but these are generally the essential kinds). The trick in this article will likely be to understand what is 4Hi dependent, and why it received’t kick into 4Hi.
You aren’t obtaining any flashing of the lights whatsoever (when you try to interact 4WD)? There ought to only be a person light-weight on at any given time (indicating which variety you happen to be in) — several lights must flash if you check out to engage 4WD (possibly Hello or Lo). If you try to interact 4WD plus the lights do not modify (ie. no flashing), I'd personally suspect an issue with both the wiring into the TCCM or the TCCM itself is poor.
Hmmm… my initially thought is that it's a wiring trouble. Why? Just because you could prove the process operates by putting it into 4Lo. If you can get the technique into 4Lo, that tells me the TCCM is Doing the job (or at the least the 4Lo aspect is), the encoder motor is Doing the job, and the vacuum is Performing (the entrance hub is partaking — the vacuum swap and diaphram are Performing). I’d Check out the wires would be the TCCM to start with, then quite possibly the encoder motor upcoming.
Verify your tire stress. Your tires must be appropriately and evenly inflated before you carry on. Tires that are not correctly inflated could actually be the reason for your general performance challenges, so It is a good idea to Look at this first. You may not ought to do anything.
I'd personally Check out your Massive orange wires as that you are getting +5VDC logic as the lights are approaching within the dash. The +12VDC is useful for the encoder motor — Examine to be sure you have +12VDC at both equally the big orange wires (they are ideal beside one another… and there are two big black wires beside them which might be floor). Notes: All black wires are ground — all orange wires are electrical power (sizzling). You will find there's 10A fuse (#15) for that 4WD technique, located in the fuse panel. You will find a 20A fuse, located underneath the hood, that is also for your 4WD technique (I’ll really have to search for the fuse range). The 4WD process also pulls with the 10A courtesy lamp fuse (#10).
Hmmm… doesn’t sound similar to a TCCM problem… Appears a lot more like an encoder motor challenge, or perhaps wheel alignment near me a transfer situation issue.
At the final place I tried, I did locate a feminine connector that could do the trick… it just didn’t provide the tab to hold it in the main connector (Every unique wire clips into a place in the primary connector).
Roll the car. Thrust the car ahead at least 10 toes Together with the steering wheel unlocked to ensure the wheels are straight.
Lower the vehicle. Once you reduced the car to the ground, force down on the car previously mentioned Every single wheel a couple of periods to allow the auto to settle.
If there is no connector, like I explain, Then you definately are likely to need A further set of schematics, and another person knowledgeable about that process.
Very well, not less than the sun is shinning this early morning — what a good looking web page With all the fresh fallen snow!