HI All,

So had the warning come up on my dash ESP, ABS and service breaks (although the latter has always been there) warnings on my

The first time it came up, I googled and came up with the recommendation to turn full lock both ways, I tried it and it worked a treat.

However it came back a week later and would go away.

After a scary moment on an icy dual-carriageway I've prioritised fixing it.

I've got a DAS system and found the following:
C163D Inspect rpm sensor (stored)
C1435 This fault can be ignored and erased (current and stored)
P1860 - The right rear wheel rpm signal sent from the traction system via the CAN bus is implausible (event stored)
9059 Communication with component B33 (ATA inclination sensor) is interrupted (current and stored)

The recommendation for the speed sensor is to inspect the sensor...

I attempted to inspect the rear right (as viewed when sat in the car) speed sensor and OMG such a problem. I couldn't get it out, it was absolutely seized in, every single point of contact between the plastic sensor and the metal was solid. It took me hours with a Dremal (because I was going gently and didn't want to damage anything)...
Finally machined the last of it out and certainly no hope of inspecting it. I already had the replacement (from ECP) Having re-threaded the cable and got it all in, wheel back on, etc.

Took it out and exactly the same.

DAS is still quite new to me but this time found the actual values and low and behold the right rear speed sensor is show 0mph when all the others are showing exactly the same.....

Help, what next?
* Anyway to check wiring?
* Is it possible to check or clean the reluctor ring?
Can this be done with compress air through the speed sensor hole? If so whats the recommendation for jacking the car and getting in neutral to be able to spin the rear wheel?

The only other things I've done recently was replace pads and pressure wash the car, but it didn't happen immediately after either....

Thanks in advance to everyone!!

 

I would remove that sensor and inspect the pick up on the hub, i have seen them when the pick up ring comes apart.

 

Thanks for the reply.
Do you know if you can inspect through the hole of the sensor or do you have to dismantle the rear hub / drum?

Thanks,

 

you can remove the sensor with the car on the hoist and spin the wheel by hand wile looking in the hole for the sensor

 

Thanks for the help!

Turns out it was the reluctor (speed sensor) ring.... It was completely dead (spin the wheel and it didn't turn) - obviously very corroded... I loosened it a bit to turn & work intermittently but was junkked.

I only found that out after spending hours trying to remove the speed sensor which initially snapped and was completely fused in there... I ended up dremel-ing (drilling) the whole unit out. There wasn't a single piece of the speed sensor that wasn't fused to the casting... absolute nightmare...!

But all done now and on to the next major problem....!

Thanks again!

 

Just wanted to add to this thread as I had the issue described and managed to resolve it. The answer is at post number 12 on this thread but perhaps not well written enough for people to pay attention!

I did not replace anything. I had a problem with my ESP module and had to replace it (I bent a pin on it). The ABS light came on shortly AFTER replacing the ESP module with a good used unit from eBay.

The reason the light came on is that the replacement ESP module was not calibrated to the sensors on the car and that causes the ESP module to enter the misleading error state where it reports a defective YAW sensor. There's nothing wrong with the sensor as many others have found, replacing it makes no difference.

To calibrate the ESP module you have to do the drive test sequence.

1. Set the steering angle to 0-degrees as per diagnostics screen instructions.
2. Disconnect the diagnostics system and turn the car off, take the key out and wait 10 seconds or more.
3. Start engine, don't touch the steering wheel after setting it to zero-degrees in step 1.
4. Press the ESP button on the dashboard to turn off ESP
5. Drive forward at around 6mph and swerve left to right a little as you're going... not more than 360 degrees turns... really only requires a little swaying and not a big movement.
6. Turn right 90-degrees and then back left again.
7. If this has worked then the ABS light will have turned off by itself.

All these instructions should be showing on your diagnostics computer anyway but sometimes people don't properly read what is on the screen and start replacing parts without looking at all the available information.

 

Something odd with the forum where it has moved onto another thread on a similar topic. I'll try and find the right thread and add my reply there.

 

Tried to post it on the other thread but it has come back to this one again!

Edit: looks like the 'related thread' feature. So if you use the quick reply box at the very bottom of the screen it is actually replying to the related thread. You have to scroll to the middle of the screen to reply to the original topic.