H3 Traction Control Problem

[tomp]

That's what I posted above

Originally Posted by smitham

Got the truck back from the dealer tonight. It appears that one of the wheel speed sensors was bad. This made the computer think that one wheel was not going the same speed as the other 3 and then the computer took over from there.

[f5fstop]

Originally Posted by tomp

That's what I posted above

And I posted before you, (As for the symptom. I have to check on something, but it could be a defective wheel speed sensor").

However, where is the original poster? I'm curious as to if the fix I told him about took care of the problem. Possibly, he won't be back until there is another problem?

[smitham]

So I thought things were all good when we got the H3 back last night. The dealer cleaned a speed sensor and thought all was well. As it turns out all was not good. When my wife took the truck to work (8miles) and then to lunch (4-5 miles) everything was okay, then when she was on her way home the mystery brake applier showed up again (she was going +/- 45mph down a major road 4 lanes each way and the truck just slammed on the brakes and applied traction control all at once). At this point I told her to pull over and call on-star and get the truck towed to the dealer.

At the dealership I was able to talk to our actual tech and explain everything (I also shared the info that f5fStop provided me). We plugged in the Tech II and scanned all the modules and found no codes, so we went for a drive with the Tech II attached to see if anything seamed wrong, well as luck would have it, the truck worked perfect. So now the tech is going to drive it tomorrow until it duplicates the problem.

[f5fstop]

Have the tech go to his computer and to TIS2WEB and download the new calibration that is available for the problem of ABS/TC unintended operation after a reverse maneuver. It can't hurt, and may be the fix.
Let him know there will be a bulletin issued on this in the next week. But the new cal is in TIS2WEB already.
Guarantee it won't harm anything, I have been running around for over a month with the calibration in the controller and all is well. However, I never experienced the unintended brake apply like you are. (I'm just the local Guinea pig with a 2006 H3 and the programmers all know that.)

[redbird]

I am having a similar problem. Going down freeway at 60 mph the wheel locked up and slid to a stop. The wheel then freed up and drove home. A couple of test
drives confirm that the tcs light flashes from time to time for a few seconds. we hear a noise from underneath(while the light is on) but brakes have not locked up the wheel again. The noise is best described as a fast clicking sound like a
gear running across a pawl. (If you have ever had the rear wheels off the ground and tried to put the auto trans in park while the wheel was still spinning you know the sound I am describing). Any ideas?

[NEOCON1]

Originally Posted by redbird

I am having a similar problem. Going down freeway at 60 mph the wheel locked up and slid to a stop. The wheel then freed up and drove home. A couple of test
drives confirm that the tcs light flashes from time to time for a few seconds. we hear a noise from underneath(while the light is on) but brakes have not locked up the wheel again. The noise is best described as a fast clicking sound like a
gear running across a pawl. (If you have ever had the rear wheels off the ground and tried to put the auto trans in park while the wheel was still spinning you know the sound I am describing). Any ideas?

yep here ya go , they fixed mine in 2 days , if you have to drive much and your abs and stabili light aren't staying on , you should pull the fuses . my lights stayed on and the truck had turned off both abs and stabili after they started freakin out .
http://www.elcovaforums.com/forums/s...ad.php?t=28268

bad sensors and maybe a chiped or busted tone-ring

[redbird]

Where are sensors and rings located on the H3?
On other vehicles I have seen the rings on rotors, outer CV joints
as well as enclosed in hub bearing assemblies.

Also, does the TCS get its information from only the wheel sensors
or is there another sensor that somehow senses skids, rollovers, etc
such as some sort of motion type sensor?

Thanks again