Offroad Trailblazers and Envoys

Wheel speed sensors

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by Mooseknuckle » Fri Feb 26, 2010 5:36 am

Hey by changing the size of your tire in either direction in size,will that cause a problem with the wheel sensors and if so how would you correct this? Thank you.
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by Trail X » Fri Feb 26, 2010 9:50 am

Since your wheel speed sensors are directly in the wheel hub (2006-2009), they will not notice a change in tire size or gearing changes. Yes, your speedometer will be off, but not a big deal.

The place to be careful is if you swap gears on a 2002-2005. The wheel speed sensor in the rear is upstream of the rear diff on those years. A change in gearing would make the powertrain control module think the tires are spinning at different speeds. This means ABS may kick in, traction control will kick in, and the transfer case will probably have issues.
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by Zero » Fri Feb 26, 2010 10:50 am

JamesDowning wrote:Since your wheel speed sensors are directly in the wheel hub (2006-2009), they will not notice a change in tire size or gearing changes. Yes, your speedometer will be off, but not a big deal.

The place to be careful is if you swap gears on a 2002-2005. The wheel speed sensor in the rear is upstream of the rear diff on those years. A change in gearing would make the powertrain control module think the tires are spinning at different speeds. This means ABS may kick in, traction control will kick in, and the transfer case will probably have issues.




I have a 2005, and have seriously been looking into 3.73 or 3.90 gearing, are you saying because I am an 05 this is gona cause me nothing but problems?
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by Trail X » Fri Feb 26, 2010 11:04 am

You'd have to talk to PCMforless or someone that can reprogram a PCM. You need to make sure they can adjust the gearing variable. Otherwise, yes, I think you'll run into issues. I could be wrong, but as far as I know, the only gearing change that's been done was on a 2006 (AlekG).
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by Mooseknuckle » Fri Feb 26, 2010 11:09 am

Thanks James I appreciate it,your the man. Did you change out your gearing?
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by bartonmd » Fri Feb 26, 2010 11:34 am

James has not changed his gearing...

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by Mooseknuckle » Fri Feb 26, 2010 1:47 pm

Oh ok.
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by Philberto » Fri Feb 26, 2010 2:15 pm

I would suggest a change of thread title from "tire sensors" to "wheel speed sensors" to avoid confusion... Mods?
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by Mooseknuckle » Fri Feb 26, 2010 5:43 pm

ok how do I do that? also is it up to me to close out a thread when the question has been answered/solved?
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by Philberto » Fri Feb 26, 2010 5:48 pm

You can't do it... One of our moderators has already taken care of it for you. We haven't implemented a feature to mark a thread "solved" yet, but I'm sure it'll get added eventually. I'll bring it up with James and Co., but I think Teebes has to be here for us to modify the site.
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by Mooseknuckle » Fri Feb 26, 2010 7:30 pm

Ok . I'm very sorry I feel like a complete idiot on here i dont wanna mess anything up.
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by Philberto » Fri Feb 26, 2010 7:37 pm

Don't feel like an idiot... you are learning, and that is what matters.
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by Trail X » Fri Feb 26, 2010 7:38 pm

Mooseknuckle wrote:Ok . I'm very sorry I feel like a complete idiot on here i dont wanna mess anything up.


Don't worry buddy. You can't mess up anything. The worst you can do is put a post in the wrong place or ask a noobish question. Those are easily reconcilable. We're glad to have you. :woot:
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by The Roadie » Sat Feb 27, 2010 1:09 pm

Agreed. If you can understand the difference between "here" and the "other place", then you belong here. :P
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by Mooseknuckle » Sat Feb 27, 2010 5:59 pm

Thanks guys. :excited:
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by Philberto » Sat Feb 27, 2010 6:07 pm

The Roadie wrote:Agreed. If you can understand the difference between "here" and the "other place", then you belong here. :P


JamesDowning wrote:Don't worry buddy. You can't mess up anything. The worst you can do is put a post in the wrong place or ask a noobish question. Those are easily reconcilable. We're glad to have you. :woot:


Hehehe... and people say we're mean or something like that. :friday:
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by The Roadie » Sat Feb 27, 2010 8:18 pm

Philberto wrote:Hehehe... and people say we're mean or something like that. :friday:
Only if they step in it and ask the Magic Shit Lightning Rod Question: How big a tire can I fit without cutting? :shoot:
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