ABS and Traction Control

[JimmyGDawg]

I have an 08 Ford Edge with ABS and Traction Control lights on without a wrench.  Using ForSCAN I have determined that the problem is from the passenger front wheel, it has a staccato movement rather than a smooth line when tracking speed. All other wheels are smooth up and down. 
Replaced the rotor, caliper and pads, was pretty sure it was the rotor as I had to get that loose with a rubber mallet.  I’ve checked the tone ring and it isn’t loose, missing any teeth, or cracked in any way I can see or feel. My next item to replace is the sensor. 
I’m wondering if the wheel bearing going bad could give me such a result. 
 

I read a lot of the posts on here and other forums with similar problems, mostly it seems to be tone ring which appears fine.  Any suggestions?

[1004ron]

Quote

All other wheels are smooth up and down.

What do you mean by that ? - a wheel bearing going bad you might feel when rotating it, but can't understand how you moved it up and down.

 

A wheel bearing would need to be very bad for it to cause a dropout of signal from the ABS sensor.

 

It the shocks are bad and the wheel not well balanced it could be skipping and the sensor missing a beat.

[enigma-2]

Possibly the sensor is defective. Watch this video to see how to test

 

[WWWPerfA_ZN0W]

any work in the area recently?  cracked tone ring is often the reason behind this issue.  you will see a thread or two on fixing it with jbweld if the break is not bad. OR put in a new axle.  replacement rings are not available.

 

how to check the tone ring

 

[JimmyGDawg]

Using ForSCAN you can output a oscilloscope like record (Similar to a heartbeat monitor or an EKG) for any sensor that you have on the car in real time.  The lines for 3 wheels run smoothly up in unison and back down when decelerating. The offending wheel looks like a jagged mountain as it goes along. I attached a picture for illustration. 
 

I’ve inspected the tone ring twice and not found any cracks, missing teeth, or anything other than rust really, that could be wrong with it. 
 

Very glad to hear you say the bearing would have to be causing a signal dropout as if it was that bad I imagine I’d be hearing it grind which I am not. 
 

The new speed sensor should arrive tonight and I’m hoping that takes care of it.  I will advise whether it does or doesn’t tonight or tomorrow.  
 

If it doesn’t fix it then I will replace the half shaft,  which would require an alignment to be done wouldn’t it?

[Cerberus]

1 hour ago, JimmyGDawg said:

 

Very glad to hear you say the bearing would have to be causing a signal dropout as if it was that bad I imagine I’d be hearing it grind which I am not. 
 

 

a bad wheel bearing will not necessarily have an audible tell or perceptible vibration before it goes very bad.

some don't give much warning at all before they fail in catastrophic fashion. it depends on the vehicle and bearing design, plus a handful of variables

[CARR142]

6 hours ago, JimmyGDawg said:

I will replace the half shaft,  which would require an alignment to be done wouldn’t it?

No alignment needed.

[JimmyGDawg]

Well I’m a liar apparently. I went to replace the sensor and underneath was the crack in the ring.  I’ve missed it twice before, so I’ll order a half shaft. Thanks to all for your help!

[WWWPerfA_ZN0W]

motorcraft or detroit axle likely best bets.  i am running the cardone pro axles, about 1.5 years now, no issues, but dunno if they will be as good as MC.