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4th August 2017, 20:04 | #241 |
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Rover 75 CDT-2001 Join Date: Jan 2009
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To get live data showing the fault would be invaluable, so it has to be worth it after such a long time trying to solve it.
My own experience of faults are that they can pass static tests, and work dynamically for a while, but then come back. Sometimes it shows the abs light, sometimes no light and a pulsing pedal, but each time i have faced it, it has always been down to sensors. I had a real struggle with aftermarket sensors. Brand new from a reputable source but gave intermittent faults, the only solution ended up a genuine MGR semsor. £60 a sensor, rather than £15 but it worked. At this stage of the game with so many parts having been changed, the T4 dynamic testing has to be the way to go. |
4th August 2017, 20:15 | #242 |
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Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009
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One interesting fault I had was a bit of rust behind the OSR sensor mounting, which had the effect of increasing the air gap slightly between the sensor and magnetic reluctor in the bearing.
Took some time to track it down as it wasn't easily visible, and the fault it caused was intermittent. |
5th August 2017, 06:55 | #243 |
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Mike, How did you diagnose to that specific wheel, with the rust spot on the backplate, that was causing the problem, or was it just trial and error until you found it?
My experience of looking into the 4 wheels. is that there can not be a gap issue on the front wheels, as the Hall Effect reading is taken from the side of the sensor which fits tight into the front hub slot. There is no possibility of any lateral movement of the sensor, assuming you replace the sensor with one of the same length. For the rear sensors, provided the hub sits flush on the back ring, the gap again can't really vary. The only possible disruption is perhaps if there is excessive dirt on the reluctor ring or around the end of the sensor protruding through the back plate. It's a difficult problem to solve as the T4 test, as many on here have indicated, doesn't offer a difinitive indication as to where the fault originates from. I've found this from the original dynamic test from Soul's garage in Olney and from a seperate static test when replacing the front wheel bearing. Larry |
5th August 2017, 07:31 | #244 | |
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Quote:
The sensors can move at the front, mine did that. I drove around on one for a few hundred miles then had the pulsing problem, followed by the light come on a while later. When checked i found the sensor had pushed slightly away from the hole, as it was an aftermarket one for some reason it just didnt quite fit right and after time it pushed itself slightly out. My theory with these things is when a problem arises just after doing some work, that is the wheel to concentrate on. When i had the pulsing on a back wheel, it was the wheel where i had just adjusted the handbrake. Sure enough, rust from the backplate had damaged the sensor on that wheel as I had disturbed it. Front wheels are easy to determine, right one and the soeedo fails, left one and the cruise fails. |
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5th August 2017, 08:20 | #245 | |
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The sensor had recently been replaced, so I took it out and tested it by hand with another bearing and it was fine. So thinking the air gap may be a problem I checked the rear of the backplate and lo and behold a raised flake of rust was found which was preventing the sensor from seating correctly. |
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5th August 2017, 08:37 | #246 | |
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75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010
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What must be understood, is that a complete failure to generate the pulses, will trigger the ABS warning light [EDITED -] and disable the complete ABS system, but the odd few missed pulses, which usually happens at low speed, will trigger the ABS into operation with the judder because it thinks that tyre is sliding on the road surface. It is doing what it is designed to do. Which is where the use of a volt meter (or my alternative, of a piezo sounder or earpiece) combined with rotating the wheel slowly and marking the tyre for each click, doing it repeatedly to ensure no clicks are missed, is the way to do it when all else has failed to find the issue.
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Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money. Last edited by HarryM1BYT; 5th August 2017 at 12:40.. |
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5th August 2017, 11:37 | #247 | |
This is my second home
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009
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I'm only guessing mind - I don't know this to be a fact. |
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5th August 2017, 18:46 | #248 | |
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T4 is only as good as the person operating it, and their skill in interpreting the results it is providing that operator. Contact Phil-T4 and he will be able to correctly diagnose the fault present on your car, and repair it too So stop messing about trying to repair it yourself, it would appear you are out of your depth and running around in circles Brian |
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6th August 2017, 18:39 | #249 |
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"So stop messing about trying to repair it yourself, it would appear you are out of your depth and running around in circles "
Quite the little charmer aren't you Brian. I wonder should you be in business at all with an attitude like that. Both the T4 users were recognised garages, one with a good history of selling and servicing Rover and MG cars. Larry |
7th August 2017, 08:43 | #250 | |
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75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010
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Quote:
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Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money. |
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