Odd ABS Sensor Issue

bankz5152 · Jun 17, 2018

Not too sure what to make of this one.

Changed me swivel bearings last week and since refitting the right ABS sensor it shows up the fault "electrical failure 18 times" I clear it and it comes back asap. However sometimes when driving the lights will go off and itll be fine, until i go full lock right and the lights come back on.

Wireing looks to be fine and on the Nanocom its getting voltage.

Any ideas? Ive bought a new sensor to test with it.

sierrafery · Jun 17, 2018

measure live stationary inputs while it's on full lock

bankz5152 · Jun 17, 2018

Didnt think of that.

Swapped it out for a new one. All appears well

AuDeefer110 · Jul 2, 2018

Hey

bankz5152 said:
Didnt think of that.

Swapped it out for a new one. All appears well

Hey Bankz did you re adjust the abs sensor gap.
This happened to me and I figured out I had knocked the sensor just enough to cause intermittent abs fault.
Adjustment is push all the way in till it hits the bottom. I pull it out a touch just so it doesn't damage the sensor when you start driving.

AuDeefer110 · Jul 2, 2018

Hey

bankz5152 said:
Didnt think of that.

Swapped it out for a new one. All appears well

Hey Bankz did you re adjust the abs sensor gap.
This happened to me and I figured out I had knocked the sensor just enough to cause intermittent abs fault.
Adjustment is push all the way in till it hits the bottom. I pull it out a touch just so it doesn't damage the sensor when you start driving.

bankz5152 · Jul 2, 2018

I did try that. Issue remained

bankz5152 · Sep 19, 2018

Save making another thought id start this one again.

Same issue has resurfaced on the same side. Though less intermitant, lights only come on for roughly half my drive then off again. Same code on the Nanocom.

Been faultless since I changed the sensor.

Wireing looks intact bar the cable that attaches to the brake fluid cap had corroded off, now replaced. Could that be the issue?

bankz5152 · Sep 19, 2018

Also anyone know whereI can get a Wabco sensor? Cant seem to find any.

Ive changed the sensor again as I need the ABS/TC working for spain!

sierrafery · Sep 19, 2018

IMO it's some problem with the reluctor ring but if you want sensor afaik wabco stopped producing front ones so you can find from old stock in few places, e.g https://www.best-of-land.com/en/shop/parts/spare-parts/brakes/abs-sensor-assy-def-td5-wabco

bankz5152 · Sep 19, 2018

sierrafery said:
IMO it's some problem with the reluctor ring but if you want sensor afaik wabco stopped producing front ones so you can find from old stock in few places, e.g https://www.best-of-land.com/en/shop/parts/spare-parts/brakes/abs-sensor-assy-def-td5-wabco

Cheers SF

Reluctor ring?

KISSMYAURA · Sep 19, 2018

bankz5152 said:
Cheers SF

Reluctor ring?

Exciter / Relucter / Tone / Actuator ring.... Toofed ring fingy for abs pick up on yer cv, creates a disturbance in leccy / maggy field that sensor picks up and by magic turns into wheel rotation speed for ecu to digest.
Sorry clear throat,...
The actuator is a toothed tone wheel that rotates with the individual wheel. Each tooth on the tone wheel acts as an actuator for the wheel speed sensor. As the tone wheel rotates, the teeth go in and out of the proximity of the sensor. The result is an alternating current (AC) voltage that is generated in the speed sensor coil by magnetic lines of force fluctuating as the tone wheel passes by the magnetic sensor.

1988smithy · Sep 20, 2018

KISSMYAURA said:
Exciter / Relucter / Tone / Actuator ring.... Toofed ring fingy for abs pick up on yer cv, creates a disturbance in leccy / maggy field that sensor picks up and by magic turns into wheel rotation speed for ecu to digest.
Sorry clear throat,...
The actuator is a toothed tone wheel that rotates with the individual wheel. Each tooth on the tone wheel acts as an actuator for the wheel speed sensor. As the tone wheel rotates, the teeth go in and out of the proximity of the sensor. The result is an alternating current (AC) voltage that is generated in the speed sensor coil by magnetic lines of force fluctuating as the tone wheel passes by the magnetic sensor.

That ay bad shag

sierrafery · Sep 20, 2018

bankz5152 said:
Cheers SF

Reluctor ring?

I'm not sure about defender but i think it's within the wheel hub?, it's something you'll have to find out, maybe somebody more experienced with the defender will enlight us... it's available for many modells but i couldnt find for Defender, on the D2 is integral part of the wheel hub.... make a google search on "Defender td5 ABS ring" to make an ideea, IMO you have to change that '''wheel bearing" or the hub which incorporates it not so many sensors, here's the explanation from nanocom ABS guide for Defender(i coloured in red the important part):

Wheel speed sensor voltage: This shows the DC Voltage for the right front wheel speed sensor. Expected values are between 2.0 to 2.4 Volts.
The wheel speed sensors are different to the conventional wheel speed sensors used on other Land Rover products. Conventionally, wheel speed sensors have an interference fit with the hub or back plate. This positions the sensor close to a reluctor ring. The sensors used are incorporated into the inboard wheel bearing, on both front and rear hubs. This bearing assembly is a sealed unit and has no replaceable parts. Also different is the wire from the wheel speed sensor. Land Rover has, historically used a wheel speed sensor employing a signal wire inside a shielded earth wire. The new wheel speed sensors have a twisted pair of wires. This offers some electrical advantages over two straight wires. Such as the signal being less susceptible to electrical noise or interference and it generates less electrical noise, the wires can also be balanced together (similar electrical properties) to ensure voltage losses are minimized. Like a conventional wheel speed sensor, the signal created is an AC sine wave. This wave is generated in the inductive sensor by a sixty-tooth reluctor, machined into the wheel bearing inner race. The frequency of this signal supplies the ABS ECU with the information it needs to determine the speed of the individual wheels and is used in the calculation of vehicle speed or vehicle reference speed.

bankz5152 · Sep 20, 2018

Ahh gotcha. Havnt got time to check to CV before spain. Though was in good nick when I changed ths bearings a few months back.

Strange that this cropped up after changings the swivel bearings.

Drove 80 miles today with the new sensor no issues so far.

Odd ABS Sensor Issue

bankz5152

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AuDeefer110

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