serious ABS problem! HELP PLEASE!

Ok, Hi i am ben, I have introduced myself in the newbe section ;-)

I have the following problem on my Rangy and no one here ( Prague) can help me it seems.. so maybe one of you have an idea!?
Problem:
Car: Range Rover L322 4.4 Liter 2004.
In the winter I had ocasionally the following: the car seems to block via ESP one wheel. Driving wasn´t possible, after approx. 50 meters, the ABS warning light came on, aursusp. inactive hdc etc,blablabla and driving was fine except no abs.
SO: I removed , because diagnosis said so, the right rear abs sensor, after removing ( destroying) we saw, that the abs ring wasnt moving...
I bought a part used ( second hand) driveshaft with hub and abs ring. The old abs ring has expanded and was rotten/corroded into the housing.
The new drifeshaft is installed, the ring turns free, and the abs sensor is fitted... result:
THE SAME! the rear right wheel is braked by the ESP/ DSC.... the light is flickering in th edashboard until the ABS red and yellow lights are on and system is deactivated,
The DIAGNOSES shows: THE RIGHT REAR WHEEL SENSOR show nearly 100% more speed that the other 3 wheels!!!
To eleminate the cause by the ECU I made from old abs sensors 2 cabels with proper plugs and cross connected the rear sensors.
So right sensor delivers signal to left in going channel on ecu and left sensor ist delivering into right ingoing signal.
My thoughts to this: if the ECU is faulty it mus tsend signal to valve block and block again the left wheel.
RESUT: IT DOESN`T ! it was now braking the LEFT wheel via DSC/ESP.
So the diagnisis showed the left wheel had now 100% more speed...
WHAT CAN CAUSE 100% higher speed signal?? the sensor is original part, the distance between snsor and ring was a little bit to much: the gap has been 2,5 mm, I adjusted it with removing some plastic material, no it has the proper 0.8 - 1mm ABS gap. BUT the signal is still 100% more..

What makes me confuse ist the fact that I had the smilar problem BEFORE changing the driveshaft and the sensor...
has anybody an idea, what can produce this fault?

cheers and regards

Ben

The replacement ring had the same number of teeth?

L322 sounds like @Saint.V8 territory. Or @holidaychicken

Hi,

thanks ! As i am aware there is just one version used in the range rover l322. even on ebay you can replacement rings in one size ( tooth)
Double signal strength would mean double tooth number, and I had this problem as I discribed also BEFORE changing sensor and ring.. so there mus be another explanation. I just dont want to change the whole ABS Unit, because from my point of view it s not a ecu fault. If I am wrong, please let me know....

The fact you made up a cable to cross over the wiring and the fault then applied the left brake and not the right would suggest there is indeed nothing wrong with the sensor or pick-up ring....as the fault moved sides when you crossed the wiring from oneside to the other...this would indicate either a fault with the wiring to the ECU or the ECU itself....

Now, there were issues with the 'short harness' to the ECU connection....it fills with water and tracks up the loom and into the plug connection. Solution was to remove the existing 'short harness' and splice in a new section (this is available from Land Rover). Now I am not saying this is the issue, but it may pay to look closely at the ABS ECU plug and contacts for any signs of corrosion or getting wet.

https://www.landyzone.co.uk/land-rover/recurring-abs-fault.222079/
https://www.landyzone.co.uk/land-ro...response-to-tech-bulletin-lm206-001v2.223588/

Similarly, there is a known fault with the Bosch ABS ECU itself which can cause all kinds of odd errors.....and that is the internal wiring soldering failing due to heat effects. It is very common in the E39 and E38 5'er and 7'er BMW's as the ABS ECU is so close to the exhaust manifold. In the L322 the ECU is mounted slightly higher up above the exhaust manifold, but can still suffer from heat related problems. Only solution is to have the ECU remanufactured or fit a replacement.

https://www.landyzone.co.uk/land-ro...is-going-to-be-is-it-you-stubborn-cow.223991/
https://www.landyzone.co.uk/land-rover/bosch-5-7-dsc-abs-ecu-module-internal-view-with-video.224307/

My first port of call would be to check the wiring continuity from the sensor plug back to the ABS ECU plug and ensure it is OK...next would be to look at the connections ofr corrosion, then finally try a replacement ECU - note: the ECU needs to be coded to the vehicle.

HI and thanks !
I will check connectors and wiring.
But for the sensor/ring there is maybe a missunderstanding? I connected the suspecious faulty left sensor to teh connector of the rear right (car) connector. The the ecu received on the left signal channel the 100% double signal that means that the ecu is really getting a 100% plus signal from the right sensor/ring. If it would be the ECU then the fault occurs further on the right side.. but it wasn´t.. it reads from this sensor 100% + signal....
hmm sounds to be a investigating week....

PROBLEM SPOLVED !!
i had some corrosion on the Connector to ABS ECU, but th emain THING: THE NEW ABS SENSOR WAS BROKEN !!! WE HAVE MESSURED IT !
so bought a new original one, and everthing worls as it should !!!! Thanks to all !

Well done!

Pete

Further to my post above pointing to ABS Connector corrosion, this can be down to a fault in the short harness to the ABS ECU as detailed in the Technical Bulletin in one of the links I also proved.....check this out also.

If it was that serious you'd have screamed unheard and be dead now...