Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 26th August 2019, 15:37   #11
ratchet
Posted a thing or two
 
ZT-T + CTDI

Join Date: Oct 2014
Location: Gone walkabout
Posts: 1,185
Thanks: 179
Thanked 361 Times in 289 Posts
Default

Quote:
Originally Posted by hogweed View Post
is it obvious where the sensor is when you take the wheel off?
Very easy to spot and trace as it's the only electrical cable in the area. You should find the connector (light blue colour) very close to the hydramount on a diesel car............haven't got a clue where it is on the petrol versions
ratchet is offline   Reply With Quote
Old 26th August 2019, 15:40   #12
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

Quote:
Originally Posted by ratchet View Post
You should find the connector (light blue colour) very close to the hydramount on a diesel car............haven't got a clue where it is on the petrol versions

Mine's a tractor
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Old 30th June 2020, 18:24   #13
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

Well, I thought people might be interested in an update. Sort of. Can’t BELIEVE it’s nearly a year ago… the problem gradually went away over a week or so after that, never came back, so of course I didn’t get anything done.


A couple of weeks ago, though, the brake pedal started to kind of rattle slightly when depressed – only at slow speeds, really. So I decided to get the sensor replaced – our local Rover guy has been out of action for a while, so I took her to my other trusted garage.


His diagnostics confirmed that the front o/s sensor was dodgy, so he replaced it. Unfortunately, no better…


I’ll be taking it to Mark when he has some time, but in the meantime, does anybody have any thoughts? The rattle (which does feel a bit like the ABS kind of “flickering”, but pretty gently, and with no wheel locking or anything) *sounds* like it’s that front o/s wheel.


Do you think it is still something about the ABS, or does anything more mundane and mechanical suggest itself?


The disks and pads were replaced maybe 15000 miles ago, and I drive in a very relaxed fashion these days.


Thanks
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Old 30th June 2020, 18:43   #14
Arctic
Give to Learn
 
Arctic's Avatar
 
Freelander 2

Join Date: Aug 2010
Location: West Midlands
Posts: 18,651
Thanks: 1,155
Thanked 6,407 Times in 3,874 Posts
Default

Quote:
Quote:
Originally Posted by hogweed View Post
Well, I thought people might be interested in an update. Sort of. Can’t BELIEVE it’s nearly a year ago… the problem gradually went away over a week or so after that, never came back, so of course I didn’t get anything done.


A couple of weeks ago, though, the brake pedal started to kind of rattle slightly when depressed – only at slow speeds, really. So I decided to get the sensor replaced – our local Rover guy has been out of action for a while, so I took her to my other trusted garage.


His diagnostics confirmed that the front o/s sensor was dodgy, so he replaced it. Unfortunately, no better…


I’ll be taking it to Mark when he has some time, but in the meantime, does anybody have any thoughts? The rattle (which does feel a bit like the ABS kind of “flickering”, but pretty gently, and with no wheel locking or anything) *sounds* like it’s that front o/s wheel.


Do you think it is still something about the ABS, or does anything more mundane and mechanical suggest itself?


The disks and pads were replaced maybe 15000 miles ago, and I drive in a very relaxed fashion these days.


Thanks
Hi Roger.
I presume you still have your speedo working now with the new front OS sensor change ? if so then it's most likely going to be one of the other sensors or bearing.

T4 will pin point it for you, but my bet is on the OS rear sensor/bearing have the back plates on your car ever been changed ? if not it could be rust of one of those that is causing the trouble.
__________________
Arctic
Givology Learn to Give
Everything is Achievable

ad altiora tendo.

Check out our Nano meet dates
http://www.midlandsnanomeets.co.uk/

http://www.the75andztclub.co.uk/index.php?thepage=howto

" You do the work , we supply the expertise "
Arctic is offline   Reply With Quote
Old 30th June 2020, 18:46   #15
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,515
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Slow speed activation is generally the rear wheels, mine was. Usually caused by rusty rear brake shields - flakes of rust contaminate the sensors / magnetic strip on the bearings.

Mine took me a fair while to get my attention as it sometimes went away, and I was pretty sure it was the right rear playing up, sometime later Toaf told me it was the opposite side. New brake shields from DMGRS and cleaned magnetic strips cleared the problem.

Regards
vitesse is offline   Reply With Quote
Old 30th June 2020, 18:57   #16
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

Thanks guys. Steve - the speedo started working again not long after I started this post, and never went funny again - that's why I left things alone.


Maybe I should dig my TOAF out, and see if it shows another sensor up?


I can't remember exactly what Mark said when he did my brakes a couple of years ago, but I *think* the backplates were the only things not replaced, as they were surprisingly OK
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Old 30th June 2020, 19:13   #17
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

Okily dokily... dug my TOAF out, but in the ABS module, it just had the failure logged for front o/s.


I'm guessing the mechanic didn't clear that after fitting the new sensor, but I'll check it again after driving tomorrow...
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Old 30th June 2020, 21:08   #18
Mike Noc
This is my second home
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 11,531
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
Default

Two things come to mind. It still could be a problem with the front offside wheel; if the magnetic reluctor in the bearing is slightly damaged, or there are any flakes of rust on it then it can cause a problem at slow speeds and the speedometer will still read OK.

And secondly if one of the sensors misses the odd magnetic segment, then it doesn't always show as a fault, as that is exactly what happens when a wheel starts to lock up. Sometimes you get a plausibility fault though.

Getting a voltmeter out and testing the voltage changes between each segment as you slowly rotate the wheel is a bit time consuming but works well enough.
Mike Noc is offline   Reply With Quote
Old 30th June 2020, 21:25   #19
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

Quote:
Originally Posted by Mike Noc View Post
Getting a voltmeter out and testing the voltage changes between each segment as you slowly rotate the wheel is a bit time consuming but works well enough.

Thanks Mike... so, for the uninitiated, do I take the wheel off, connect the meter to the ABS sensor, then rotate it?


I have plenty of time...
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Old 30th June 2020, 22:49   #20
Arctic
Give to Learn
 
Arctic's Avatar
 
Freelander 2

Join Date: Aug 2010
Location: West Midlands
Posts: 18,651
Thanks: 1,155
Thanked 6,407 Times in 3,874 Posts
Default

Quote:
Quote:
Originally Posted by hogweed View Post
Thanks Mike... so, for the uninitiated, do I take the wheel off, connect the meter to the ABS sensor, then rotate it?


I have plenty of time...

Hi Roger.
You should find that the club as two that can be borrowed to use

https://www.the75andztclub.co.uk/for...d.php?t=260420
__________________
Arctic
Givology Learn to Give
Everything is Achievable

ad altiora tendo.

Check out our Nano meet dates
http://www.midlandsnanomeets.co.uk/

http://www.the75andztclub.co.uk/index.php?thepage=howto

" You do the work , we supply the expertise "
Arctic is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 15:07.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd