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Your comment about moving into slippery situations plus the 2Hi gentle goes out… The one thing I can think of is the TCCM (Transfer Circumstance Management Module) could have corroded wires, which was the initial subject matter of this thread. Does this occur quickly once you get into slippery circumstances?
As to the encoder motor getting fried since the TCCM “obtained corroded and shorted it out†— once more, it doesn’t seem likely to me. You'll find (off-the-prime of my head) seven wires concerning the TCCM as well as encoder motor. 2 of these are electric power (+/-) and therefore are FUSE protected. 4 of them are sign strains and the last a single is signal floor. If the bottom wire was corroded and shorted (to what?
I have alter the sprint selector, checked out the tccm module it clicks but will not appear outside of lo four wheel push, I disconnected the vaccume module in the middle of the hearth wall.
Indeed, following changing the TC or perhaps the encoder, I would reset the program by disconnecting the battery for 1/2 hour and afterwards cycle the ignition from on to off thrice.
Once i get a lot more time, I’ll inform you about all the opposite things which have long gone Incorrect with my Blazer Considering that the day I drove it from the lot, with twelve KM on it. It really is, as so a number of other blogs I have study from Blazer homeowners online, the Tale of a lemon.
one) Allow’s start off with the easy things — have you checked your fuses? Don’t believe that Simply because the fuses are labeled 4WD that they're the one ones for the 4WD method! Fuse 10 (on my 2003 Blazer) is to the courtesy lights — but guess what? What's more, it controls the logic side in the TCCM (+5VDC). Pin six (thinner orange wire) ought to make +5VDC and may be Sizzling All of the time (meaning you ought to be capable of read through +5VDC on the line anytime, vital on or off). The 2 large orange wires are your +12VDC traces and they are controlled in the 10A fuse located in spot #15.
Hmmm… my to start with considered is that it is a wiring issue. Why? Just because you'll be able to prove that the process will work by Placing it into 4Lo. If you may get the technique into 4Lo, that tells me the TCCM is Doing work (or no less than the 4Lo part is), the encoder motor is Performing, plus the vacuum is Operating (the front hub is engaging — the vacuum swap and diaphram are Doing work). I’d Check out the wires would be the TCCM initially, then perhaps the encoder motor subsequent.
I discovered a forum where a guy experienced a challenge where his 99 Blazer would not shift to 4HI. When he pushed the 2HI button, the light flashed but nothing occurred.
What it feels like is you'll have an encoder motor dilemma — this is the motor to the aspect of the Transfer Circumstance that controls the shifting of the different “modes†(2Hi, 4Hi & 4Lo).
I’m going to e mail you, as I would like to get a keep of your diagram — with any luck , you’ll let me submit it right here to save men and women a while (and you simply from needing to email it out to specific people all the time).
Don't forget, grounds are Vital that they are Very good. I'd glance a Try THESE Guys bit more challenging at your motor ability traces than everything — It will be These lines that the fuse could well be blowing (I might Assume — however , you haven’t said which fuse is blowing, and also the 4WD system has two or three them — I think I posted them inside of a reply here somewhere!).
What you describe seems like the ported vacuum change (NOTE: this switch is barely on 1999 and up autos). I’m unsure to the “Listening to anything functioning†— what does it seem like?
It Seems a lot more like “mechanic communicate†to me — but who am I? What exactly do they claim for being the situation While using the TCCM? What Section of it can be terrible?
Now, You will find there's sensor around the front, suitable hub to detect when it truly is engaged — I have not tried out this, so I don’t know one hundred% for sure, but If your front, correct hub is not participating, the process should detect this and never enter 4WD.