wheel speed sensor going bad? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 06-22-2011, 07:26 AM Thread Starter
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wheel speed sensor going bad?

im getting the ABS ESP and BAS lights on the dash. they will come on for a day or 2 then go back off. steering wheel is centered and i have same pressure in the tires. i also have some slight moisture around the axle seal. checked diff fluid level and its barely a hair low. topped it off and it has been the same sense.

playing in the mud the other day the lights were on and my back driverside brakes kept locking down. almost caused me to get stuck a few times.

so do you think the sensor got dirty from the diff fluid? or is it fried and i just need to pay the $15 to get a new one?

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post #2 of 14 Old 06-22-2011, 07:33 AM
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i've had that happen after playing in the mud. usually it went off by itself.

Nick had this problem and it was the connection from the sensor to the harness.

31 jeeps in... still have issues
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post #3 of 14 Old 06-22-2011, 07:42 AM Thread Starter
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this was going on before i was in the mud. also checked the connection and it seemed like it was tight.

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post #4 of 14 Old 06-22-2011, 07:54 PM
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Mine did that when the front hub bearings went bad. Metal shavings from disintegrating bearings confused the sensors.

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post #5 of 14 Old 06-23-2011, 10:03 AM
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I damaged one about a month ago while at Rausch Creek. When the wiring pulled off, it bent the pins. It was about $18 for the part.

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post #6 of 14 Old 06-23-2011, 06:55 PM
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Quote:
Originally Posted by Alter Ego View Post
Mine did that when the front hub bearings went bad. Metal shavings from disintegrating bearings confused the sensors.
this ^^^

jack up tire and see if you can move the wheel in and out


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Originally Posted by Dancin Dan View Post
A Jeep just zipped past my house and I could swear I heard the driver yellin:

"The tkob is coming!! The tkob is coming!!"
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post #7 of 14 Old 06-23-2011, 07:13 PM Thread Starter
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thanks guys ill try that in the morning. gonna be pissed if thats it since i just did a gear swap and they put a new bearing and seal in.

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post #8 of 14 Old 06-24-2011, 03:18 AM
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Wouldnt be the axel bearing, you should be good there . It would be the unit bearing, thats the one that lives in the hole where the speed sensors at. Not a hard install just got to pull the disk of its behind it.


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post #9 of 14 Old 06-24-2011, 03:36 AM
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Been thinking about changing my unit bearings,never did it before do you have to drain the diffs befor pulling the bearing out.

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post #10 of 14 Old 06-24-2011, 03:38 AM
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Also when a unit bearing (hub bearing) is starting to go, the heat from the friction can melt the plastic sensor.

Another possibility- on one of mine, the allen head bolt that held the sensor in walked out and let the sensor move enough to read sporadically.

And they wouldn't have replaced your hub bearings when regearing. The hub bearings are on the ends of the axle. Your lug bolts are actually part of the hub/unit bearing.
There are videos on here somewhere of my wheel flopping with a bad bearing and I still never felt anything odd while driving.


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Last edited by venom; 06-24-2011 at 03:42 AM.
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post #11 of 14 Old 06-24-2011, 03:41 AM
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Quote:
Originally Posted by jkruss View Post
Been thinking about changing my unit bearings,never did it before do you have to drain the diffs befor pulling the bearing out.
Nope its outside the axel seals, dont think you have to pull the axels, but I could be wrong.


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post #12 of 14 Old 06-24-2011, 03:46 AM
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No you don't have to pull axles or drain fluid. Takes about 20 min.
Pull wheel
Pull 2 bolts that hold caliper bracket and hang the caliper
Remove rotor
Remove large axle nut
3 bolts in the back side if the unit bearing and the wss plug and it's off - slides over axle stub shaft

Hardest part is the damn plug on the wss wire is behind the shock tower and SUCKS to get to

I'm going from memory but I'm pretty sure that's everything.

Good time to lengthen your wss wires when you are replacing it and have it in your hand and easy to work on

Edit: here's a vid of what your wheel should NOT do

YouTube - Failed unit bearing


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Quote:
Originally Posted by My Wife
I might just go crazy and kill you in your sleep, instead of just planning it.

Last edited by venom; 06-24-2011 at 04:37 AM.
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post #13 of 14 Old 06-24-2011, 04:17 AM
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Quote:
Originally Posted by Alter Ego View Post
Mine did that when the front hub bearings went bad. Metal shavings from disintegrating bearings confused the sensors.
Ditto.

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post #14 of 14 Old 06-24-2011, 03:09 PM
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Quote:
Originally Posted by venom View Post
No you don't have to pull axles or drain fluid. Takes about 20 min.
Pull wheel
Pull 2 bolts that hold caliper bracket and hang the caliper
Remove rotor
Remove large axle nut
3 bolts in the back side if the unit bearing and the wss plug and it's off - slides over axle stub shaft

Hardest part is the damn plug on the wss wire is behind the shock tower and SUCKS to get to
you can remove the clip from the shock tower to give you a little more slack to unplug it, its a christmas tree type base that you can pop off, look at the outside of the tower you'll see the black trees holding it on.

I'm going from memory but I'm pretty sure that's everything.

Good time to lengthen your wss wires when you are replacing it and have it in your hand and easy to work on

Edit: here's a vid of what your wheel should NOT do
you can use a screw driver to hold the rotor still so you can get the axle nut off or loosen the axle nut while wheel is on and on the ground.


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Quote:
Originally Posted by Dancin Dan View Post
A Jeep just zipped past my house and I could swear I heard the driver yellin:

"The tkob is coming!! The tkob is coming!!"
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