denes says: June eight, 2008 at 4:28 pm The encoder motors generally fail within the 2002+ autrotrac (four 4wb buttons) blazers and s10 p/u’s. A printed circuit board Get in touch with “cooks out” In the encoder motor confimation switches. Just so you recognize, the A,B, and C switches explain to the TCCM what general shift postion they’re in. the P switch is actually a singal into the TCCM when to halt the motor (remaining park postion). I'm very absolutely sure A is 2wd, B is 4wd Hello, and C is 4wd small. In case you’re slightly intelligent w/ electronics, You may as well correct the TCCM issues w/ new relays.
When you jack up the vehicle, make certain it is extremely steady before you climb underneath, and especially Before you begin shaking your wheels to check the suspension. If the car have been to tumble off the jack stands, you can be poorly hurt or maybe killed.
Another location for 4WD vacuum is underneath the battery — but that is very a distance from your motorists doorway, Even though everything is possible.
If I press the 4-Hello or four-lo when in park or generate, I get very little. No clicking, and The sunshine will likely not mild up. But when I get it done from Neutral like I just described, it works similar to a appeal plus the lights get the job done as well.
Regrettably, attending to the vacuum switch is often a challenge, as you have discovered. I don’t want to say “yeah, start ripping things apart” as I are not able to definitely response that question — only you may know if you have the capability to disassemble matters and be capable of set them again together. If you are feeling it is possible to get rid of a distributor cap, and so on. and set them back again immediately after, go for it! You’ll help you save yourself a huge amount of $$$ doing it your self.
My to start with dilemma could well be, what are the lights around the dash performing (the 4wd pushbuttons)? And next, what 12 months of vehicle are we speaking? (I’m also assuming we’re nonetheless talking about a Chevy Blazer.)
Well, that’s one that I haven’t listened to but. The “ATS” fuse (that's marked “ATC” on this schematic) supplies 12VDC to two large orange wires with the TCCM (marked as pins C18 and C19 within the schematic). As I explained, I haven’t viewed this problem just before, so I haven’t traced that Portion of the system. I am able to only suppose (yeah, I do know!) that the because these wires offer 12VDC, They're utilized to run heavier things including the encoder motor (5VDC, which can be wheel alignment near me the light guage orange wire, is utilized for logic — ie. to operate the “chips” to the circuit board). Ideally, you may see the place I’m likely using this. I’m just hoping to consider it logically — If your fuse is blowing that supplies 12VDC, what from the 4WD process would use 12VDC?
three) the encoder motor/module is negative. This is actually the module/motor that is certainly mounted straight to the transfer circumstance, who’s position it is to bodily go the gears on the transfer situation to put the TC into the assorted modes (2Hi, 4Hi, 4Lo).
I've Chevy 2001 Blazer. The challenge I had is usually that I can’t activate the 4Hi. So I went to dealership. The mend costed me $900 to replace the TCCM.
Quantity 7 has been the culpret in 2 from the blazers I've worked on its hardned metal so never try and make one particular away from any washer it's going to are unsuccessful. GM sells this washer in what they get in touch with a washer kit it consists of 7, twenty, and 24. If any person has this problem its a simple correct therefore you dont even have to get rid of the diff, just the axle tube, but youll have to remove the halfshaft 1st this fix took me just above an hour or so to accomplish.
GM includes a design flaw in this particular transfer scenario — the “forks” experienced plastic bushing that should put on out and allow the gears from the TC float, and will likely not pull the gears into their appropriate positions.
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I am able to’t thanks sufficient for this web site. I got a 95 Jimmy on an impound auction for $320. I acquired it started off, and positive more than enough no four wheel generate. I seen the sprint buttons seemed like they didn’t simply click, they lit up when ingnition was turned on, then two Hello stayed lit, thats all I could get them to accomplish. So I grabed on to the two wheel button and gave just a little tug and it poped correct out on the sprint.
You might also unplug the TCCM and faucet within the encoder module to view if it may be trapped (a warm garage wouldn’t damage either!) — depart the TCCM unplugged for a minimum of two minutes, then plug it back in. Then, transform The real key on to off five occasions, then to on and check out it.