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

[Orchid70]

Hi
I havent done anything with this car but read with VIDA once.
V70 from 2000 in Sweden.
ABS light and Traction control light on
Fault code was read and the left front was to plame.
This was changed
The ligths were left on
At this time I read the fault codes and took a graph of the ABS velocity on the front sensors - see the picture. When the right shows 26 km/h - the left one shows 0,5 km/h.
I also checked that both front sensors had the same resistance 64,2 kilo ohms (if I remember right)
By this time the fault lights came on after some 200-300 meters drive on 70 km/h road.
Then the tone ring was changed.
Then the Box was changed to an other used with exactly the same number on it.
Now, around a week later, the light comes on after getting out from the drive way - around 20 km/h.
The owner tells that the hydraulic system is working very hard after you start driving before the light comes on. This behavier was exactly the same with both ABS boxes.

My question is - how often does the hydraulic unit get bad?
Or could it be electrical?
I will get the car so I can search for the fault methodically some time next week.
Thankfull for ideas.

[misha]

You need abd/tracs module re-soldering.
They ALL suffer from cold solders.
If you know how to solder,you can do that yourself...if not...every electrician(tv repair shop for example)can re-solder it for you.
If you want troublefree fix...contact matty moo on this forum.
He is repairing those modules with lifetime warranty...if i remember correctly.

[Orchid70]

You need abd/tracs module re-soldering.
They ALL suffer from cold solders.
If you know how to solder,you can do that yourself...if not...every electrician(tv repair shop for example)can re-solder it for you.
If you want troublefree fix...contact matty moo on this forum.
He is repairing those modules with lifetime warranty...if i remember correctly.

As I said - its already been changed. It was my thought it would have been the module.
He says that the hydraulic is making a lot of noise - with all the modules (he actually bought two modules from the scrap yard, but one of them did not have exactly the same number) - the hydraulic is behaiving the same and the fault lights behaves the same, no matter which module is fitted.

[Orchid70]

Ive had one module having bad solderings - that car got a DIM behaving really bad.
I have hard time to think that three different modlues (ABS/Tracs) would have the exact same problem.
Oh and yes - one of the modules he got from the scrap - have been opened and sealed again!

[wizechatmgr]

Check the connector to the ABS module and to the sensors. Could be some corrosion or an intermittent fault.

My thoughts are if 3 ABS modules ran into the same issue, it likely isn't (but still could be) the modules.

Also double check the ABS sensors on the front - remove, clean and reinstall them - they are potentially prone to failure where the wire goes into the sensor and where the pinch point is on the strut. Are the sensors & tone ring OEM? Have you checked the sensor resistance at the ABS module connector?

[Orchid70]

Check the connector to the ABS module and to the sensors. Could be some corrosion or an intermittent fault.

My thoughts are if 3 ABS modules ran into the same issue, it likely isn't (but still could be) the modules.

Also double check the ABS sensors on the front - remove, clean and reinstall them - they are potentially prone to failure where the wire goes into the sensor and where the pinch point is on the strut. Are the sensors & tone ring OEM? Have you checked the sensor resistance at the ABS module connector?

Thanks Wize....
My thought was to start with all those things as soon as I have the car here. I did tell him to take the connector out on the module - but the mechanic who helped him only moved them, when attached. So Ill look at the pins, measure the resistance between the sensor connector and module connector, measure both sensors again.
The left side (the one giving the fault code, both before end after changing it) is not OEM or the tone ring.
Will let you know when I know more.

[Orchid70]

So, this is what Ive found out so far:

This is what happens during the test procedure, during the time, ABS pump sounds LOUD and the brake pedal pulses, like when the ABS is working.
The blue is left sensor and during test/start procerude the velosity goes down.
The green is right sensor.

This is what happens during the test procedure:

After deleting the fault codes - first (after the above happens) the ABS light lits.
After short while also the Tracs control light lits.
We drove some 15 km to a friend.
When started there - only the ABS light came on.
And after the starting proceruder (pump tests it self and all the sensors) - then both Tracs AND Check Engine light came on.

The check engine light did not come on first time he came to me, to get the car read with Vida. At that time, only the ABS and Tracs light came on. And the pump did not make that noise.

I have tested both front sensors to have 24,4 Mega Ohms resistance at the first connector (crazy high isnt it?)
ABS box to left front sensor connectors, have 0,4/0,5 ohms resistance on both pins.
ABS box to right front sensor connectors, have 0,4/0,5 ohms resistance on both pins.

One of the ABS moxes had been repaired, so it was easy to open:

My guess is its the pump thats failing - does anyone have any idea how to test it so I can be sure?

[Orchid70]

I dont mean the pump - but the hydraulic valve that the pump is attached to.

[wizechatmgr]

If you have VIDA you should be able to trigger each of the solenoids and listen for a click. The click isn't 100% accurate, but if one is hanging up, you should hear it.

You can also potentially trigger the ABS pump and TRACS solenoid to engage (if it has one...)

[Orchid70]

If you have VIDA you should be able to trigger each of the solenoids and listen for a click. The click isn't 100% accurate, but if one is hanging up, you should hear it.

You can also potentially trigger the ABS pump and TRACS solenoid to engage (if it has one...)

I know its possible to do in later model V70 - but I couldt find it for this first generation model. VIDA isnt too easy to find things in....
I can trigger the pump though. Will try it tomorrow and see how it reacts.