denes states: June 8, 2008 at four:28 pm The encoder motors usually fail about the 2002+ autrotrac (four 4wb buttons) blazers and s10 p/u’s. A printed circuit board contact “cooks out” inside the encoder motor confimation switches. Just so you already know, the A,B, and C switches explain to the TCCM what general change postion they’re in. the P switch is often a singal to your TCCM when to stop the motor (remaining park postion). I'm quite guaranteed A is 2wd, B is 4wd Hello, and C is 4wd very low. In case you’re somewhat intelligent w/ electronics, It's also possible to repair the TCCM issues w/ new relays.
Stretch a string. With an assistant, have a bit of string or wire and stretch it amongst the traces to the front on the tires, Despite the spindle, and evaluate the distance over the string.
As for the internal workings of the transfer situation, I leave that to The professionals so I can’t remedy that question possibly.
The first thing I'd personally Examine would be the 4Hi gentle — (preserve it simple) — does the 4Hi light-weight at any time appear on?
May very well be a TCCM issue, encoder motor trouble or possibly a transfer situation trouble — all of which has been covered in just this thread.
In case you don’t head, I'd a great deal love to put up your opinions — if you want, I'm able to leave your title out — certainly, the selection is yours and I will regard any choice you make, just allow me to know.
If I needed to guess — either your encoder motor is shot, or bad wires around the TCCM. Should you’re really into it, I’ll post the schematics with the wiring on the system — this will help you to trace and test factors along the method to pinpoint the trouble. (I must scan them, so it may not be right now!)
No, I don’t have anything at all AFAIK — but I do Possess a buddy which includes the All-Information procedure and could possibly have it (he printed out some great schematics for my TCCM yesterday) — I’ll ask him right now and if so I will post it in this article to suit your needs.
If everything is engaging / disengaging properly, I'm able to’t see it becoming an issue as A brief resolve. Of course, I wouldn’t endorse it being a long-lasting resolve (gotta say it!).
As I claimed to the preceding poster, if you want to enter into it, take away the encoder motor with the TC after which consider to engage the varied push modes — and view the motor to be sure it’s transferring in each Instructions (it should really arrive at a prevent in three distinctive positions, with the a few drive modes — mark wherever it can be when you start to help you put it back again there if all else fails!
 Determined by your steering system, there may become a clamp that needs to be taken out at each conclude to verify the bellows boot will not be sticking into the inner tie rod. Consult your handbook for particulars.
As I'm not a mechanic, every thing which i find out about the Blazer 4WD procedure has, essentially, been posted listed here — you Going Here only have to examine.
Doesn’t sound superior. It seems like what I just went via — and it turned out being the gears/forks in the transfer case. I initial recognized that I experienced difficulty coming out of 4WD, then I commenced noticing 4Hi “slipping” out and in.
What you describe feels like the ported vacuum change (Observe: this switch is barely on 1999 and up automobiles). I’m undecided about the “Listening to one thing running” — what does it sound like?