denes claims: June eight, 2008 at four:28 pm The encoder motors typically fail about the 2002+ autrotrac (four 4wb buttons) blazers and s10 p/u’s. A printed circuit board Get hold of “cooks out” inside the encoder motor confimation switches. Just so you realize, the A,B, and C switches convey to the TCCM what normal shift postion they’re in. the P swap is actually a singal into the TCCM when to stop the motor (closing park postion). I'm very absolutely sure A is 2wd, B is 4wd hi, and C is 4wd lower. Should you’re just a little intelligent w/ electronics, You may also correct the TCCM challenges w/ new relays.
You are likely to have to give me some more information — like what, exclusively, have been you executing if you got the service mild to head out? Exactly what is the program undertaking now, if anything? Have you checked ALL your fuses (even those beneath the hood?). Did you check for corrosion on in the TCCM?
The full alignment of present-day contemporary autos consists of a number of angles and measurements all working alongside one another. Should the changes are done improperly, handling is usually negatively affected and could induce a safety issue in Extraordinary cases.
I went further more and checked out the Vacuum Change as proposed as part of your blog. I related the vacuum traces with each other (although the four wheel light-weight was flashing) which engaged the four Wheel Method. I reconnected the vacuum strains, frivolously tapped the Vacuum Swap and it began to function like new. My guess is that the swap stuck as a result of lack of use. Without the need of your blog the vehicle dealer can be paying out my income about now. Thanks!
However, I don’t know the solutions to most of your issues — I am able to guess, but that’s what it’s destined to be, a guess.
I may very well be wrong using this type of, but standard logics (and also the schematics) tells me to start out checking out the wire that prevents the TC from shifting Should the A/T is in gear.
The trouble, as I identified, was corroded wires within the 4×4 module. The module is found guiding the kick panel about the travellers facet (see photo down below). How did I realize this? Each time I'd engage my four wheel push, I might hear a “simply click – click on” coming from that location… in no way thought just about anything of it ’til now!
Hmmm, appears like you have a unique technique there — appropriately, I can't allow you to any even more as I'm able to only help with what I am accustomed to.
If you don't listen to the “click on-simply Click Here To Investigate click”, there is a lousy relay within the TCCM. The excellent news — you may get a substitution relay at your neighborhood electronics retail outlet and replace it in the TCCM. You will need a soldering iron and several simple electronics expertise, but it is vitally quickly reached (a handful of details to unsolder then resolder The brand new relay set up).
It’s possible which the process is participating by itself. Nevertheless, 4WD engages WITH vacuum, not without the need of — accordingly, you will have a bad vacuum swap that's allowing vacuum by when it shouldn’t. Now, why the lights are heading out, that may be odd. I wouldn’t Consider the method would “reveal” 4WD when it wasn’t physically set there — indicating, When the 4WD technique DID happen to kick in as a result of vacuum, the TCCM would have not acquired a signal to PUT the technique into 4WD and therefor wouldn't move the encoder motor, or activate the 4WD indicator lights. If the 4WD procedure is kicking in on account of vacuum, the only real real thing to generally be influenced would be the entrance axle, which happens to be precisely what is controlled via vacuum.
It’s hard to diagnose difficulties like this devoid of having the ability to test matters — nonetheless it sounds like either the TC encoder motor signal lines are terrible (a nasty floor might be an issue far too) or maybe the “forks” during the transfer circumstance are worn, enabling the gears to drift, through which scenario the gears for 4Hi is probably not shifting into place.
Devoid of realizing What's going on along with your controls, I don’t really know what far more I'm able to give. In the event your controls perform, and you also here the Transfer Circumstance Control Module (TCCM – the module beneath the travellers kick panel!
Kyle, you are able to article as you like.To add data, my supplier was discussing changing the 2 Laptop modules affiliated with the 4wd, They mentioned exact as when they changed them in ’05 that both equally must get replaced at $1060 moreover tax and that was a mininum.
Great luck, and let me understand what you discover — during the hope that it'll support another person down the road.