2000 V70 ABS-0011 ABS-0012 new sensor fault, Sensor to ring clearance bad Topic is solved

[Orchid70]

You're only going to have three variables with any issue on the front. Any issues within the pump assembly aren't going to do what you're experiencing, that's all mechanical and not electronic.

1-tone ring
2-sensor/sensor wire
3-loose or missing axle bolt.

back at the harness I suppose you could have a pin pulled out, but that's incredibly rare. It's imperative that you absolutely make 100% sure that harness is completely bottomed out.

The left wheel feels weird. Left inner steering linkage is gone and nerds to be replaced - but it should not affect the ABS - should it?
And the locking plastic piece on the ABS box harness is weird too.
Tone ring was replaced even if the old one was good (they had to hit it out).
Ill double check everything.

In the same time - measured Velosity with VIDA gived first time this result on left/right front sensors (he had changed the snesor first time) - scale different from the other measruing times:

Here is the same measure of front sensors "Velosity", speed, after changing also the tone ring AND the box (the repaired box from the pictures before):

Here is the rear sensors with the same box as above:

Best to take the oscilloscope out and see that the tone ring is behaving ok.
Or even better - start from the scratch and NOT trust anybody elses job =)

[abscate]

Those downward spikes are crap being stuck in these sensor or tone ring, or maybe even the ring hitting the sensor, which will kill it. Take it out and look for scuffing. You can also swap the sensor and see if the scope trace moves

[Orchid70]

I found the valve testing!!
We took the car for a drive and I poked around =)
In Giagnostics -> Vihacle Communication - see below:

Im stuck outdoors because my hubby is working on an other car... and its FREEZING COLD!!
But - I checked with the scope at the ABS box connector and at the left sensor connector and the results are the same as in VIDA. Exactly the same.
We jacked the front up and hubby "drove".
There is battery voltage at the connectors.
We thought to check if there was some wire loos/crack - that showed only during load.
So tomorrow Im taking the wheel and hub off to check.

Here are some readings from before.

Im not too familiar yet with the scope so you have to excuse me for the strange look for the waves =)
Measured at the ABS box:

Measured at the sensor connector:

When Im looking at the sensros I have (the first new one was bought for second generation car and I had no idea it would fit/work) - the original has quite a lot scuffings AND the new one that had been on the car just for couple of days ALSO has scuffing on the middle!!
The old sensor:

The new sensor:

Who would think that this could happen.....

Thanks abscate. You are not the first one to say its a tone ring/sensor fault - you are though, the first to tell, that the VIDA scope reading means - just that.
I will let you guys know as soon Ive get so far!
Thanks all!!!
(The Mazda 6 in the garage has four totally rusted gliding bolts in the rear calipers - not even the inductions heater helped, so the only thing to do was to use angle grinder to separate the brake pad holder and caliper...)

[abscate]

MVS Volvo Horns.jpg (59.79 KiB) Viewed 803 times

Who would think that this could happen.....

...someone who chased it for a week on SWMBOs BMW.....

[Orchid70]

Who would think that this could happen.....

...someone who chased it for a week on SWMBOs BMW.....

My English is not always so good so I understand the small hints ----- have the same happened to you?
...havent been on this for a week yet - but with the guys own efforts to fix it - its been couple of weeks now =)
However I LOOOOVE the way we can all together find solutions (hoipefully we have done so)!!!!
Im so grateful I could cry!

[abscate]

In plainer English - My wife's BMW has this same problem - except the ABS fault didn't come on very often. I finally managed to monitor the wheel speed and saw the same scope trace you did, and then found the wheel sensor fault.

Tack!

[Orchid70]

In plainer English - My wife's BMW has this same problem - except the ABS fault didn't come on very often. I finally managed to monitor the wheel speed and saw the same scope trace you did, and then found the wheel sensor fault.

Tak!

Tack!!
Kiitos!!!
Finish, living in Sweden =P

[Orchid70]

Above is the tone ring.
The black ring represents the ABS sensor.
The red line represents the distance to the CV joint edge - where the right side's tone ring is placed. The left side tone ring was placed too far in on the axel and the sensor overlapped the ring with only 1-2 mm.
I dont know if the ring is thinner than the original tone ring.
The sensor was intact.

SOOOOO - you all were raight!!!

Ive learned a little too!

The ABS sensors have the right resistance and my multimeter works just fine!
I took both loose sensors to an electric repair guy I know.
The results were the same with his Fluke..... 20-30 Mega Ohms!
And he says its exactly the kind of results I should exept on this kind of ABS sensor.
This is the type in V70:
https://www.picoauto.com/library/automo ... r-digital/

And I notised the zigzag patern from the VIDA scope was inverted, the first time.
Below picture is from that time, with a sensor for V70 II (perhaps 0,5 mm longer than the old one) and the old tone ring that damaged the original sensor - "standing" zigzag:

Below picture is from the time with the new tone ring beeing too far in on the CV joint, so sensor (right sensor this time) and tone ring dont have proper contact - "hanging" zigzag:

Sorry for the scales beeing different above - Im learning how to use things =)

We did check the splines on the axel and in the wheel bearing - and there was no visible play.
There is however some small play in the outer CV joint and inside the gearbox, as well as in the inner steering linkage.
The lower ball joint was bad - and we have changed the wishbone.
Because it was not me who changed the tone ring - I have no idea why the original sensor got in contact with it in the first place. Maybe it was so rusty or maybe there is play in the front.

Ive learned loads!
And with little time on my hands, stubbornness and help from all you, once again, fixed a "mystery"
THANK YOU!