Technical ABS sensor removal

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Technical ABS sensor removal

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Aug 12, 2012
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I have a ABS warning light on my dash ,so since the MOT is due soon i thought i would pull the sensors to clean them as a first fault finding step ,problem is that after removing the retaining bolt the things will not budge ,are they normally that hard to get out ,i am assuming that after undoing the bolt they should pull out
 
Hi

It's well documented on here that the sensors SHOULD pull out once the retaining screw is removed, but the crud/ rust stops this happening.

A better bet would be to read the fault code so that you know which sensor is at fault, if any. A cheap ELM code reader is all you need, with the Fiat ECUscan software which is available on this site.

A battery on it's way out (low voltage) can give this error, also, so it may not be the ABS system itself.

I hope this helps you.

JamesAtthews
 
I had a thread on this abs light they are a pain once removed they r no good so find out what one is at fault first
 
Hi

It's well documented on here that the sensors SHOULD pull out once the retaining screw is removed, but the crud/ rust stops this happening.

A better bet would be to read the fault code so that you know which sensor is at fault, if any. A cheap ELM code reader is all you need, with the Fiat ECUscan software which is available on this site.

A battery on it's way out (low voltage) can give this error, also, so it may not be the ABS system itself.

I hope this helps you.

JamesAtthews

Cheers for the reply ,i'll give them a squirt with WD40 before trying again .

Re the ecu reader ,getting one that will read the abs system is quite expensive .i thought i had bought one as recomended on this site but it turns out they don't you have to take them apart and adapt them
 
I had one for sale that used to read it I brought already adapted on eBay for 20 quid from London with all leads and bag cable and a link for free multiecuscan if u would like I can give u details for the seller
 
I had one for sale that used to read it I brought already adapted on eBay for 20 quid from London with all leads and bag cable and a link for free multiecuscan if u would like I can give u details for the seller

That would be great ,i have a OBDII ELM327 which as far as i can tell is supposed to read the ABS modules but all the imported ones from china need adapting
 
This is who I brought from and recived next day e bay item number. 200834462517 good luck
 
Ur welcome if its front sensor if u need one might have a new one from unipart in my yard cheap as I never replaced mine I sold car on
 
Should mention that i think it is just a dirty sensor because occasionally when the ecu is doing it's pre start checks the ABS comes up 'OK' and goes to faulty a few seconds later ,most of the time it comes up faulty straight away though
 
Don't think it could be a 'dirty' sensor as they're encased in a plastic housing, so totally isolated from the elements.
could be a connector, possibly dirty/damp/corroded pins/sockets.
The connectors for the rear ones are under the plastic floor trim inside the rear doors, so unless you've had an internal spill of something, they should be OK. Wouldn't hurt to check anyway though.
Not sure about the front ones.
 
The connectors for the front ones are high up, near the back of the engine bay. On the drivers side it's near the diesel filter (on the JTD, obviously - not sure about the petrol ones!) and on the other side it's near the strut turret. If you get stuck, I can take a couple of photos and post them here.

Somewhere on the forum I've seen some resistance figures for the sensors. If you pull said connectors apart, put a multimeter across the pins then rotate the wheel in question, you should get a range reading to see which sensor has gone t*ts up. Might be worth a search on here to see if you can find the post.
 
Should mention that i think it is just a dirty sensor because occasionally when the ecu is doing it's pre start checks the ABS comes up 'OK' and goes to faulty a few seconds later ,most of the time it comes up faulty straight away though

Have u slammed on or braked really hard lately this can cause them to shift and record a fault that just needs resetting
 
How?
If you hit a big enough kerb, hard enough (e.g. hard enough to rip your hub off), then maybe.
Can't see how hard braking would affect the sensors though, after all, that's primarily what they're designed for, so numpties who never learned (or were never taught) to drive properly can just stomp on the brakes at the last second and not worry about locking the brakes up...:rolleyes:
 
How?
If you hit a big enough kerb, hard enough (e.g. hard enough to rip your hub off), then maybe.
Can't see how hard braking would affect the sensors though, after all, that's primarily what they're designed for, so numpties who never learned (or were never taught) to drive properly can just stomp on the brakes at the last second and not worry about locking the brakes up...:rolleyes:


Afraid to say if u do some homework and look about its a more common fault than u would think if u do anchor it on hard it can cause abs sensors to fail
 
Afraid to say if u do some homework and look about its a more common fault than u would think if u do anchor it on hard it can cause abs sensors to fail


I would have to take your word for it Pete123 that hard braking can cause ABS sensors to fail, can't say I have heard of it before.
 
I would have to take your word for it Pete123 that hard braking can cause ABS sensors to fail, can't say I have heard of it before.

I wouldn't of believed it either but the most common car for it is land rover and range rover? Nothing to do with fiat I no
 
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