5R55N subtle troubles or big problem?

[joegr]

Either it will spin smoothly and quietly (good), or it won't (bad).

 

[heyjewel]

Either it will spin smoothly and quietly (good), or it won't (bad).

OK. Simple. Thanks. Someone said mud or dirt might get in somewhere and paper clip or something might push it out. Anyone ID where that dirt might be hiding to mess up ABS ?

 

[JaredI]

I Just got rid of an intermittent awful terrible grinding when braking. Mine would occur always at slow speeds. Turned out the rear pads were getting low and the spring clip on the driver outside was working itself into the rotor face. Occasionally. Looking at it, I would've thought it would do it 100% of the time. Just a thought, HTH.

 

[heyjewel]

I Just got rid of an intermittent awful terrible grinding when braking. Mine would occur always at slow speeds. Turned out the rear pads were getting low and the spring clip on the driver outside was working itself into the rotor face. Occasionally. Looking at it, I would've thought it would do it 100% of the time. Just a thought, HTH.

Thanks for this tip

 

[heyjewel]

Either it will spin smoothly and quietly (good), or it won't (bad).

Joegr: So I finally got around to pulling the passenger wheel etc down to the disk off and the hub turns freely and smoothly. So it must be the left side. The screwy code system did indicate that side once though it always felt like the right side.
Course it was intermittent so would the problem definitely rear its head up manually?

 

[joegr]

I would expect that you would be able to feel it, but maybe not. Do you happen to have an oscilloscope by any chance?

 

[heyjewel]

I would expect that you would be able to feel it, but maybe not. Do you happen to have an oscilloscope by any chance?

I do have a nice O'scope. I haven't tried the drivers side yet only the passenger and it feels smooth forward and reverse.
Where should I apply the scope?

 

[joegr]

Across the speed sensor. (I would unplug it and probe at the sensor connector so as to not have to cut the insulation anywhere.)

 

[heyjewel]

Across the speed sensor. (I would unplug it and probe at the sensor connector so as to not have to cut the insulation anywhere.)

Do you mean the ABS sensor behind the fender skirt? And what am I looking for? A pulse every revolution? I assume ignition must be on? Which pins? I'm looking at wiring diagram but cannot make heads or tails of it.

 

[joegr]

Yes, the sensor is on the back side of the hub assembly, but the connector is somewhere on the inner wheel liner. You are looking for a clean, consistent (with speed) sine wave. It is multiple pulse per revolution. Key off. You are probing the sensor, not the car side. With it disconnected, there's no way the key being on could change anything anyway.

 

[heyjewel]

Yes, the sensor is on the back side of the hub assembly, but the connector is somewhere on the inner wheel liner. You are looking for a clean, consistent (with speed) sine wave. It is multiple pulse per revolution. Key off. You are probing the sensor, not the car side. With it disconnected, there's no way the key being on could change anything anyway.

OK. A big 'Duh' on the key on/off with the connector disconnected! I'll get to it real soon now. Weather just turned nasty again.