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Rover 75 abs fault *****FIXED****

Posted By m.c.autos 2/2/2010 3:37:29 PM
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m.c.autos
 Posted 2/2/2010 3:37:29 PM
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Hi everyone,some help needed,I have a rover 75 diesel 03,when braking at all speeds the pedal is making a springing noise which sounds like abs cutting in,there is no light on,the data live on my scanner reads near enough the same on all four speed sensors when car is moving and braking,I have substituted each speed sensor in turn with a new one,when i removed the sensor i couldnt see a reluctor ring on cv joint so i assume it has active sensors with magnets in bearing,there is no play in the wheel bearings,I am suspecting pump/ecu but it looks a pig of a job to replace,any ideas would be appreciated before i go broke from looking at it,cheers Michael.p.s no fault codes.
2/23/2010 6:34:19 PM by m.c.autos
aidan
 Posted 2/3/2010 3:21:53 AM
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Hi
You need a scope on the sensors next

Any work on wheel bearings ? air gaps ok ?

Cheers Aidan


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Chris Venning
 Posted 2/3/2010 3:48:31 PM
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Check carefully that the inner bearing seals incorporating the magnetic ring are secure and not damaged. It does sound like a faulty wheel speed signal when drawing to a halt.

Had this on a Mondeo, not easy to spot without a bit of dismantling.

Are there no fault codes present?

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TONY_GINGELL
 Posted 2/3/2010 4:32:44 PM
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M/c
How about disabling the ABS and then take it for a test drive? I once had a Volvo with a similar fault it it turned out to be a defective disc.


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m.c.autos
 Posted 2/3/2010 5:01:38 PM
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Hi guys,thanks for the info,I have disabled abs and the noise goes away,also I have checked the inner magnetic rings,they seem all similar a bit dirty but no damage,there is no fault codes, but I think I will have to go back on friday and re-check everything, bearings rings,air gap and put a scope on sensors as sugested,cheers to all.
2/4/2010 3:23:55 AM by m.c.autos
m.c.autos
 Posted 2/18/2010 5:50:15 PM
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hi guys,ive been back to look at the dreaded rover,checked waveform on sensors and a/c voltages,i changed o/s/r bearing and sensor plus pump,but still i have abs solenoids clicking when i apply the brake,even when pressing softly,no fault codes,no abs light flashing,if i disable system or unplus brake switch problem goes away,any more ideas would be appreciated,cheers.p.s resistance from abs multi plug the same on all sensors.
2/18/2010 5:58:02 PM by m.c.autos
K And R
 Posted 2/18/2010 6:08:11 PM
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mc

You will not get any codes or abs lights IF one of the active bearings has a fault, if it was a sensor or any other part of the system you would have a code.

But an faulty active bearing WILL pulse the pedal.

Kev,

"If you dont KNOW how it works, don,t try to test or fix it"

m.c.autos
 Posted 2/18/2010 6:31:08 PM
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i have checked voltage on each sensor and they all rise and fall pretty much the same when i spin the wheel,also the waveform all seem to have a simular pattern,its only a basic snap on one,so it seems the bearings are working,all bar changing them one by one im not sure how else i can narrow it down.
TLDmobilerepair
 Posted 2/18/2010 7:02:43 PM
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I had one of these last week with exactly the same problem. I advised the customer that it would of been a fault with one of the bearings but they decided they didn't want to spend anymore money on the car and scrapped it!
K And R
 Posted 2/19/2010 1:14:21 PM
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mc

Spinning the wheel by hand MAY not give the same readings as driven (ie bearings loaded)

Kev.

"If you dont KNOW how it works, don,t try to test or fix it"


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