Code C1042 - Right Front Tone Wheel?

[badgx]

Test resistance on ABS sensor by disconnecting the sensor cable and connecting it to the multimeter. Should show around ~ 1000 Ohms and should go up and down a little as you turn your wheel. If you open up a broken sensor, you should see copper wire coil, which if broken or corroded inside, will read 0 resistance with same test

Or if you know its the front right sensor, you may want to get a new sensor, its not that expensive. Parts list shows the front sensors are not sided.

[paul@thecustom300cshop]

here's a pic of the rear ring tone.

[Pappajohn]

Originally Posted by Jimmyboy

What does this sensor look like as my lights have come on today, My disc shield was loose so I have removed that but same problem still persists??? everything looks intact but am I looking at the correct thing? I take it that its the little square node that points towards the hub behind the disc brake??
Cant see any teeth that have been mentioned though???

Cheers,
Jim.

the long cylindrical part with the 90deg bracket, on the left, is the sensor...the other end is the connector plug.

on the rear hubs its positioned just behind and above the hub on the inboard side.
just follow the wires from under the boot floor

[paul@thecustom300cshop]

i think what the confusion is that TONE rings are only on the rear axle, but ABS sensor rings are on all four wheel bearings

[jackwalton]

Originally Posted by paul@thecustom300cshop

i think what the confusion is that TONE rings are only on the rear axle, but ABS sensor rings are on all four wheel bearings

I'm reallly confused now Paul. As far as I am aware "Tone Rings" is just a name to describe the toothed mechanism (covered over with insulating material on 300C) that is used for detection of rotational speed of each wheel. Also somtimes called "ABS Sensor Wheels" or "Reluctance Wheels". "Reluctance" because of the principle of how they work.
Surely there is only one speed measurement on each wheel, just a case of whether anyone calls it ABS, Reluctance or Tone.


Jack

[UK CHRYSLER 300C]

Jack,there are no teeth on those "rings" that Paul has pictured it's just one magnetic ring and you have to be very careful fitting those type especially if it's part of the wheel bearing,I can't be 100% sure on the C but it looks like the whole CV joint has to be replaced if you can't get a ring seperately,normaly it is a whole joint that has to be replaced,you can get some toothed rings seperately for some cars,same again if you can't then you need the whole CV joint replacing if a tooth has split

[jackwalton]

Originally Posted by UK CHRYSLER 300C

Jack,there are no teeth on those "rings" that Paul has pictured it's just one magnetic ring and you have to be very careful fitting those type especially if it's part of the wheel bearing,I can't be 100% sure on the C but it looks like the whole CV joint has to be replaced if you can't get a ring seperately,normaly it is a whole joint that has to be replaced,you can get some toothed rings seperately for some cars,same again if you can't then you need the whole CV joint replacing if a tooth has split

Yes thanks for the info about replacement, I'm sure your right. Paul allready corrected me on what they look like and the fact that you cant see any teeth. I was trying to explain that the teeth cant be seen but they are still there below the smooth surface and the sensor does detect each individual tooth below this surface which will be some sort of non-metallic coating, resin based, at a guess. The teeth are not required to be magnetic either, nothing in the rings are magnetic. I suppose they could become slightly magnetised in use but I doubt it. The sensor has a central magnet surrounded by a coil and the teeth induce a voltage in the coil as each hidden tooth passes the sensor. The sensors can collect bits of metalic rubbish because they are in part a magnet.

The same method is also used to measure speed on lots of industrial machinary.

Jack

[UK CHRYSLER 300C]

The wheel bearing type are magnetic,that's how they pick the signal up,there are no teeth in that sort,nor are there any resin in there

[jackwalton]

Originally Posted by UK CHRYSLER 300C

The wheel bearing type are magnetic,that's how they pick the signal up,there are no teeth in that sort,nor are there any resin in there

Well I stand corrected but to honest, I still dont believe it.
I'm no car expert so I may be wrong.

In my opinion there will be teeth under there and the measurement of each tooth won't rely on any magnetism in the "ring". The coating over the teeth or indents will be non metallic. Would love to get a hammer or grinder to one.

Wouldn't be very interesting if we all believed the same though. Lol


Jack

[sibeer]

Definitely can't see any teeth and won't be smashing the magnetic ring to find out any time soon :-)

Think I will swap the sensor over and see if the problem moves with it before replacing.