Technical Panda 169 Abs fault speed sensor

[atakan123123]

Hello

In addition to my ongoing idle problem, I am also dealing with ABS failure.

-When I connected to the ABS ecu, I saw that the left rear speed sensor was not reading.

Regarding this situation, I first changed the positions of the left and right sensors.

When I attached the left sensor to the right side, I received data.
So the sensor is solid.

I couldn't get a signal from the left side.

I decided to check the cables.

Regarding this situation, I found and measured the pins of the cables going to the sensor.


The 2 cables reaching the pin from the ABS ecu socket are solid

Finally I decided to disassemble the ecu. I checked the ECU under a microscope. All solders are solid. Mosfets are solid.
The resistance values I get from the other sensor outputs are the same as the values I get from the left sensor output.

So the ecuda is solid )

In this case, all that remains is the part on the wheel.

and I think this part comes on the bearing.


Has anyone had problems with this before? Do you know the part code or the tools needed to disassemble it?


As an example, I added the photo I marked with an arrow.

 

[bugsymike]

On many cars nowadays the ABS ring on the rear hub is magnetic which can mean poking it with a magnetised screwdriver can destroy it. Earlier ones had a visible rotor that rust or other debris could prevent it from working.
You should be able to find the ABS ring advertised at your Motor factors.
If so you need to remove the rear hub and replace the ABS ring carefully as easily damaged, both physically and as I mentioned magnetically.
It looks from your pic that yours is magnetic.
Some are part of the wheel bearing so less visible.
If you can find the threads, I have written about this in the past and I also mentioned a tester I was given at a trade show by the SKF bearing rep. It looks like a credit card but has iron filings inside it, that when held by a magnetic type rotor will show the vanes so you can see if damaged.

 

[jackwhoo]

Swap the rear hubs over .....if the fault moves with the hub then the magnetic ring on the hub is the problem.

Yes the magnetic ring comes with the hub

Do not swap the brake drums over

 

[bugsymike]

Swap the rear hubs over .....if the fault moves with the hub then the magnetic ring on the hub is the problem.

Yes the magnetic ring comes with the hub

Do not swap the brake drums over

Do you mean that unlike other makes with external ABS rings on outside of hub you have to buy the complete hub?
I have changed them on the outside of A4 Audi hubs etc.
I have changed many ABS rings on other vehicles
On looking at OPs pic of hub it appeared to have an external ring or is it my eyesight, does this model have the ABS ring in the hub bearing like some VW/Skoda etc.
Looking on eBay Febi seem to list one but when you go in a little further it is a bit ambiguous.

 

[jackwhoo]

Do you mean that unlike other makes with external ABS rings on outside of hub you have to buy the complete hub?
I have changed them on the outside of A4 Audi hubs etc.
I have changed many ABS rings on other vehicles
On looking at OPs pic of hub it appeared to have an external ring or is it my eyesight, does this model have the ABS ring in the hub bearing like some VW/Skoda etc.
Looking on eBay Febi seem to list one but when you go in a little further it is a bit ambiguous.

Hi Mike,
If it is as in the photo and if the abs magnetic ring part is available separately for the op in Turkey then I expect it can be replaced.
Sometimes the price difference between a complete hub and just the abs ring is very small.
Best wishes
Jack

 

[koalar]

The wheel bearings are different

ABS vs non ABS

It's possible someone has replaced them with wrong ones

 

[bugsymike]

The wheel bearings are different

ABS vs non ABS

It's possible someone has replaced them with wrong ones

I assumed from what OP mentioned , it was a fault that developed, rather than after fitting a wrong part.

 

[vexorg]

Why not spin the wheel and look at the signals going out, compare left to right

 

[atakan123123]

Hello, there was a slight misunderstanding.
First of all, the bearing photo does not belong to me. A representative photo I found on the internet. I uploaded it as an example.


Since I haven't disassembled this part yet, I don't know what to expect.

Why not spin the wheel and look at the signals going out, compare left to right

I moved the sensors, but I haven't disassembled this part yet.

The wheel bearings are different

ABS vs non ABS

It's possible someone has replaced them with wrong ones

In my use, ABS has been working for a long time. (4000km)

So I don't think so.

When replacing, I prefer to replace the hub part completely.


Is there an OEM code for the abs if possible?

While I have difficulty finding parts when I search for Fiat Panda, I can find them much easier with the OEM code.

 

[atakan123123]

oem number 51754193 ı think..​

 

[koalar]

oem number 51754193 ı think..​

Correct

But before ordering do the suggestion by @jackwhoo, just swap them over

 

[bugsymike]

Correct

But before ordering do the suggestion by @jackwhoo, just swap them over

Good suggestion, as I had an ABS fault on a Skoda Scout 4x4 that turned out to be in the wiring loom inside the vehicle , not what is fairly common on that model of a break in the wire within the wheel arch. For some unknown reason the wire from ABS sensor to the ABS Pump/computer went inside a large wiring loom behind the glove pocket before going on back to the engine compartment and on to the ABS pump. So after spending nearly £70 on the repair section from Skoda which includes wires and plugs to the ESP (Yaw sensor), brake pad wear indicator and the actual ABS sensor, I then had to make up an extra repair section of wire onwards to the ABS pump which thankfully cured the problem. Each time I had to take the battery and cage out plus lots more just to get to the faulty part and diagnose it.

 

[jackwhoo]

You could use jumper wires to connect the working side sensor to the faulty side connector , spin the wheel and look at the wheel speed on mes.

 

[atakan123123]

Hi, I found the fault.
One of the drum adjustment springs has fallen off. The falling piece melted the abs ring.

I have new hub and drum pads.

I have a problem with drum pads.
The adjustment mechanism and springs have been repaired before. It was fixed with glue by the master. Senseless things were done.

The brand of brake pads I bought is "TRW", made in Italy.

I need an adjustment mechanism suitable for this pad.
These mechanisms are not widely sold on the Internet. or they are quite expensive.

 

[jackwhoo]

Stop

It is essential that you buy the correct shoes and adjuster mechanism to match the brake back plate and slave cylinders.

You MUST not mix part of different manufacturer brake systems- doing so is exceedingly dangerous.

 

[jackwhoo]

The old shoes in photos look barely worn.
The cost of the correct self adjusters may look expensive to you....but they are a lot cheaper than killing yourself, maiming yourself /your friends or someone else!

 

[jackwhoo]

The new shoes in your photo will not fit/must not be used on your car

 

[koalar]

What a mess

Start again

One of the wheel cylinders is leaking photo 5 left side

Early 1.2 should be the Bosch system at least they are here in the UK

Here in the UK the cheapest way is to buy a complete set

Double check everything, there are 3 types of rear brakes used

And At least two types of rear drums, the diameter and part number should be stamped into them

 

[koalar]

As per @jackwhoo

The shoes you have bought are wrong they are for the bendix without ABS system

 

[jackwhoo]

If we know the month and year the car was made we can give the op a very good idea what rear brake system was fitted at factory

The month and year car first used could also help

My guess is it was built on or before 25 /05/ 2010 and that is a guess