Rear ABS sensor

Uncleenvoy

Well-Known Member
2006 traiblazer...somebody cut the rear passenger abs wire..any one know what size torx is needed to remove the bolt..stripped this one using and unkown size (too rusted on side to read it) and had to cut the bolt off..i want to remove one from my envoy to put in to see if that gets rid of the light but dont want to strip that one too
 

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Uncleenvoy

Well-Known Member
Its a t30 torx..tried one and it fit perfect..doesnt help me anymore though..turns out the 04 envoy doesnt even have abs sensors back here..the pic with the blue airbag is the envoy
 

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Uncleenvoy

Well-Known Member
Put in the new ABS..i now know why somebody cut that wire..the red brake light on dash went away but the yellow abs light is still on and the abs engages at every stop sign..streets are bone dry here its a sunny 54 degrees..gonna post about it in the abs thread i started if anybody has any suggestions
 
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Uncleenvoy

Well-Known Member
Put in the new abs wire on passenger rear..the red brakelight on the dash went away but the yellow abs light is still on..the abs engages at every stoplight..streets are bone dry no rain no ice..i can hear and feel it...pretty annoying..probably why somebody cut the wire
 

TollKeeper

Well-Known Member
Could be a wheel bearing. I had the same problem on mine, bearing was good, sensor in the bearing was not. Replaced both front wheel bearings on mine, and the problem went away. You should be able to plug in a mid range scan tool, and get the exact location of which sensor has failed.
 

Mooseman

Moderator
99% that it's one of your front hubs that need replacing throwing off the ABS sensor. Try cleaning the sensors, especially any rust under the sensor that would be jacking it. That fixes it 25% of the time. Usually requires a hub replacement. Trick is finding which one. You would need a scanner capable of reading live data from those sensors.
 

Mooseman

Moderator
I answered in the other thread. Please keep your issues separate. Moved the posts to this one.
 
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Uncleenvoy

Well-Known Member
drivers front
 

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TollKeeper

Well-Known Member
That sensor end looks blown apart?
 
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Uncleenvoy

Well-Known Member
Post cleaning..blown apart?where?what do you mean?
 

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Uncleenvoy

Well-Known Member
That looks about 1000x better..hope it helps
 

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Mooseman

Moderator
did you clean the rust around the sensor holes? That's where the rust will jack up the sensor and throw it off. The sensors looked fine to me.
 
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Uncleenvoy

Well-Known Member
Yes wire brushed it..theres a spacer there with a flathead screw that wasnt coming out..ill go back and see if i can get it out
 

TequilaWarrior

Well-Known Member
Remove that screw and spacer and clean them as well.... should be essentially "shiny". That whole mounting surface should be completely free of rust. Be careful not to "plane" it - i.e. don't wear it down. I've used high grit sandpaper and precision files to clean them just don't take away too much material.
 
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Uncleenvoy

Well-Known Member
Passenger front..this flathead for this shim on this side being stubborn as well
 

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TollKeeper

Well-Known Member
WTF? Is that Hub CRACKED?

Looking down the hole, I dont see any contamination on the exciter/tone ring. Looks like it has good lube going on in there. Check over the condition of the wiring, all the way from the hub, up the knuckle, across the control arm, to the harness connector. Check for anything like you had on the rear (rubbing, chaffing, etc).
 

Mooseman

Moderator
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Uncleenvoy

Well-Known Member
No change after doing the fronts..didnt get to the rears..lady came to drop off the check just as i was torquing down the front wheels..ill do the rears in the morn if that doesnt work just get new hubs NOT FROM DETROIT AXLE..after the headache i had with the ones for the envoy..maybe ill bring it to the shop have them put it on a scanner cause i voltage tested both of the fronts and they passed on the multimeter..ill test them again since i just did this cleaning..maybe its the module
 

coolasice

Well-Known Member
No change after doing the fronts..didnt get to the rears..lady came to drop off the check just as i was torquing down the front wheels..ill do the rears in the morn if that doesnt work just get new hubs NOT FROM DETROIT AXLE..after the headache i had with the ones for the envoy..maybe ill bring it to the shop have them put it on a scanner cause i voltage tested both of the fronts and they passed on the multimeter..ill test them again since i just did this cleaning..maybe its the module
I have one of my detroits abs sensor going bad, not the bearing just the sensor, ordered a timkin to replace it with. Mine didn't show any abs lights, but i did get a C0040 code for the right front speed sensor failure.

hook a meter to it and see if it outputs ~450mv at 1-2rpm
 
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Mooseman

Moderator
02-04 don't have rear sensors at the wheels. It uses the one at the driveshaft output. I have never heard of the rear sensor triggering the ABS at slow speed like that.
 
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Uncleenvoy

Well-Known Member
@TollKeeper driver rear..just like the envoy..thanks for the suggestion..why i didnt look b4 ..i dont know
 

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TollKeeper

Well-Known Member
In my best SMA (south main auto) voice. "well theres your problem"
 
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Uncleenvoy

Well-Known Member
I hope so..gonna order one now..wont be here till tuesday but i told buyer to bring it back when it comes..we shalll see
 

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