not my ABS problem

[aposegil 0]

Hello guys

 

Ok as i dont have ABS on my car (not a woman so dont need it :-P :D :roll: lol)

ive had to read all previous post about ABS you guys have put up

for my mate Pete.

 

Basically the ABS used to come on at high speeds and started to get

worse. Now when you put the ignition on the ABS flickers a few times

and then stays on solid so he has asked me to look into it as he just

had a close call lol

 

So we cleaned the front metal discs next to the calipers/disks. I

then got my multi meter out and im getting a solid reading of 1.2 at

the front senors coming from the car side but not getting very good

readings coming from the sensors. Read some where you can check it

this way

 

Also i read that you should be able to feel the ABS motor click on

but cant feel anything at all

 

Any advise?? before he sheds loads of money out??

[Henny 0]

So we cleaned the front metal discs next to the calipers/disks. I

then got my multi meter out and im getting a solid reading of 1.2 at

the front senors coming from the car side but not getting very good

readings coming from the sensors. Read some where you can check it

this way?

 

You should get those solid readings when testing the wiring back to the brain as you describe. You should also get 4 readings similar to each other when testing across the sensor side of the plugs too. If there's one that's miles out (which my betting is that there will be) then that's your dodgy sensor. 8)

[aposegil 0]

well i didnt test the rear ones

 

but the front sensors where all over the place the readin was sitting solid and they where both out a bit

 

so does it mean they both gone???

 

also thanx alot for your help mate :D

[Henny 0]

Just to check, the way you test them is this: 8)

 

FRONTS:

 

On the top of the strut each side, there is a black multiplug. This often has a red splodge of some sort of sealant on it, and one side (brain side IIRC) is bolted to the strut top. Disconnect this plug, and test the resistance across the 2 internal connections on the wire that runs down to brake area.

 

The sensors should read a couple of K ohms resistance (max!) across them. If one has totally gone, it'll read REALLY high resistance (several M-ohm)

 

REARS:

 

I've not done rears before, but I'm told there's the same sort of connection under the rear seat which you test in the same way as the fronts... Again, you're looking for a single reading that's miles different from the other 3.

 

I'm not sure what you mean by:

but the front sensors where all over the place the readin was sitting solid and they where both out a bit

 

If you mean that the readings were totally different from the readings that you got when you tested the brain side of the plugs, then this is correct, they should be. The brain side of the wiring just goes straight into the ABS brain and so you're just testing the resistance across the electronics while they are switched off... I wouldn't have advised doing this, as I have no idea what electronic components are in the brain at the point where the sensors attach, and it could be possible to cause some expensive damage by testing the resistance by connecting a multimeter which just puts a voltage through the circuit... :? You should be OK though, as the ABS brains are pretty resistant to most things... 8)

 

The 4 readings that you need to compare are the ones from the 4 sensors, ignore the brain side of the wiring for now... Write 'em down while you do them, making sure you note down which setting your multimeter is on so you can tell if it's in K-Ohm, M-Ohm or just straight Ohms and you'll spot the one that's gone PDQ! :)

[aposegil 0]

helo mate

 

on the brain side i test voltage coming to the sensors and that was solid

 

what i was meant to say about the front is there was no solid readings both sensors where all over the place nothing solid

 

ill test the rears tongiht and see what happens

[Henny 0]

what i was meant to say about the front is there was no solid readings both sensors where all over the place nothing solid

 

You were testing the resistance of the sensors with the car wheels stationary weren't you? :?

 

If the wheel was spinning, then you'd get all sorts of weird readings as this is how the sensors work! 8)

[aposegil 0]

yeah car was sitting there with just the ignition on, engine not running

 

also i test ohm on the sensor side aswell