Possible Damage Caused by Workshop

[mike_beecham]

Hi all,
Defender in for 100k service. Work done:
- rear right hand wheel bearing,
- front swivel seal (between ball and diff).
- Rear pinion seal
- Replaced handbrake cable
- Normal filters etc

He rang this morning and asked me if my ABS light had been coming on - l said nope. He told me on test-drive it came on when they got back to workshop. He checked computer for codes he said it coded for an 'intermittent speed sensor' error. I said to leave it at that and I’d drive it see how it goes.

I picked it up and now the ABS AND TC lights are coming on.


My thoughts: Has taking the rear hub assembly apart to fix collapsed bearing possibly upset the sensors????

Advice? Take it back? He is a top mechanic. Never had any trouble with him before...?


Ta,
Mike

[isuzurover]

The speed sensor is a proximity sensor which senses from teeth in the hub/cv depending on vehicle model.

It is quite possible that it has been moved/damaged during the install. It could simply be that the hub position has changed a bit with new bearings.

[mike_beecham]

Thanks for the reply:

It is 2006 TD5 Defender?
Does that help at all?


Mike

[isuzurover]

Thanks for the reply:

It is 2006 TD5 Defender?
Does that help at all?


Mike

Not really as I haven't played with new defenders much first hand. There should be others who can give you vehicle specific info.

It sounds as if two corners have been worked on??? Get underneath and try and find the sensor wires, and check that they are still connected/undamaged as a starting point.

Do you have a multimeter? Here is some generic info:
Saturday Mechanic - Troubleshooting Antilock Braking - Popular Mechanics (http://www.popularmechanics.com/how_to_central/automotive/2265091.html)

[Blknight.aus]

the sensors do move if your not careful with them.

if hes had it apart and contaminated the tone ring that will also cause failure especially if you get ferrous metal particles caught up on it.

if your lucky providing the sensor has been knocked away from the tone ring all it will require is a bit of time and effort pull the sensor out and inspect the tone ring through the hole if its dirty you can get in through the same hole with a long cotten bud and brake clean to clean it up then its just a case of repositioning the sensor.

It may also be a case of cracked wires in the harness.

If you're going to check the sensor with a meter dont forget that you should also very slowly turn the wheel while your checking it to make sure that the sensor is picking up the tone ring correctly, the meter reading should fluctuate if it is.

[mike_beecham]

Great.
Thanks for that...he hasn't given the invoice for the work yet. I might drop it back and get them to sort it...??


Ta,
Mike

[Blknight.aus]

cant hurt, be nice when you ask and if its something simple you might get a freebie.

[mike_beecham]

Hi All,
After a weekend of driving the Defender about - it seems the ABS/TC lights are coming on more so when l corner left and put the cars weight on the right hand side (the side that had the hub out).

Is this possible or is it just me??

Want as much info before l take it back to my mechanic...have not got the bill yet. Also waiting on that....as l think he shoudl rectify this with no labour charge.


Ta,
Mike

[justinc]

Mike, Get him to tap the sensor in more on the side he took apart as the air gap is probably too large. Yes they can be knocked out when working on the hub etc, I always give them a tap back in after a wheel bearing service or anytime I have the hub etc off.

JC