TOAF live data - ABS

[chris75]

Still researching my ABS problem ! I have just been out for a run with TOAF connected and displaying live ABS data ie wheel speed . Only minor discrepancies ( < 3% ) between the 4 wheels observed , but puzzled by the readings ; at about 30 mph the 4 wheels were displaying about 16 kph on Toaf , which would be about 10 mph !
Any ideas why this is , or I have I found a fault :eek:
No errors are recorded.....

[FrenchMike]

Hi Chris,i have tested mines just to see ;in static i get this:

http://rovermg1.free.fr/rovermg/thumbnails/6Gr7Cv6OxAUJnf6vxGLU.jpg (http://rovermg1.free.fr/rovermg/images/6Gr7Cv6OxAUJnf6vxGLU.jpg)

Mike

[chris75]

Thanks for that , Mike . I am using v51 , but my log display only shows the 4 wheel speeds and not the other 4 lines of data . I also don't get the large green display saying that all is well , or did you add that ? :eek:
At rest , the wheel speeds say 1.38 as do yours . I did save the file , but I cannot access any history when the software is not connected to the car , and I use a different pc to the one I am on now for TOAF so can't go looking for it at present :shrug: Will see if I can retrieve the log file later.

[chris75]

Here is the log file from Toaf , produced during a run with ABS live data on .
I have shortened the file to remove a lot of identical 1.38 readings , and what is shown represents a short run at about 30 mph . It looks unremarkable to me , but during this run the ABS was activating when I came to a stop :shrug:
I am not getting any warning lights or recorded errors , but the ABS always activates as I come to a stop . All 4 tyres are the same size , and tyre pressures are identical , so should there be any variation at all between the wheels or could cornering account for this ?
Can anyone see any issues ?
(I open this file in notepad)

[FrenchMike]

Here is the log file from Toaf , produced during a run with ABS live data on .
I have shortened the file to remove a lot of identical 1.38 readings , and what is shown represents a short run at about 30 mph . It looks unremarkable to me , but during this run the ABS was activating when I came to a stop :shrug:
I am not getting any warning lights or recorded errors , but the ABS always activates as I come to a stop . All 4 tyres are the same size , and tyre pressures are identical , so should there be any variation at all between the wheels or could cornering account for this ?
Can anyone see any issues ?
(I open this file in notepad)

Sorry ,i add it for the purpose ...

Your PHP file ...can't open it :shrug:

[chris75]

It opens in notepad or Microsoft Word for me Mike .
TOAF saves it as a .txt file , so I guess any text editor should do it :shrug:
Here goes ............

Nr;Front left wheele speed;Front right wheele speed;Rear left wheele speed;Rear right wheele speed;

99;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
100;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
101;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
102;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
103;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
104;2.88 km/h;2.88 km/h;2.81 km/h;2.75 km/h;
105;7.44 km/h;7.38 km/h;7.19 km/h;7.31 km/h;
106;12.63 km/h;12.63 km/h;12.69 km/h;12.38 km/h;
107;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
108;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
109;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
110;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
111;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
112;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
113;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
114;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
115;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
116;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
117;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
118;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
119;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
120;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
121;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
122;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
123;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
124;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
125;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
126;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
127;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
128;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
129;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
130;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
131;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
132;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
133;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
134;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
135;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
136;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
137;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
138;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
139;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
140;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h;
141;3.56 km/h;3.50 km/h;3.56 km/h;3.38 km/h;
142;3.00 km/h;3.00 km/h;3.00 km/h;3.06 km/h;
143;2.69 km/h;2.88 km/h;2.94 km/h;2.81 km/h;
144;2.94 km/h;2.88 km/h;2.88 km/h;2.88 km/h;
145;2.75 km/h;2.94 km/h;2.75 km/h;2.94 km/h;
146;2.56 km/h;2.50 km/h;2.56 km/h;2.56 km/h;
147;2.31 km/h;2.38 km/h;2.31 km/h;2.31 km/h;
148;2.56 km/h;2.56 km/h;2.63 km/h;2.69 km/h;
149;3.69 km/h;3.56 km/h;3.38 km/h;3.38 km/h;
150;4.88 km/h;4.88 km/h;4.81 km/h;5.13 km/h;
151;6.75 km/h;6.75 km/h;6.75 km/h;6.69 km/h;
152;7.88 km/h;7.88 km/h;7.88 km/h;7.81 km/h;
153;9.13 km/h;8.50 km/h;8.63 km/h;8.75 km/h;
154;8.69 km/h;8.56 km/h;8.88 km/h;8.69 km/h;
155;8.19 km/h;8.38 km/h;8.00 km/h;8.63 km/h;
156;6.44 km/h;6.63 km/h;6.44 km/h;6.69 km/h;
157;4.50 km/h;4.56 km/h;4.63 km/h;4.38 km/h;
158;2.56 km/h;2.63 km/h;2.56 km/h;2.63 km/h;
159;1.50 km/h;1.50 km/h;1.44 km/h;1.50 km/h;
160;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
161;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
162;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
163;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
164;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;
165;1.38 km/h;1.38 km/h;1.38 km/h;1.38 km/h;

[FrenchMike]

It opens in notepad or Microsoft Word for me Mike .
TOAF saves it as a .txt file , so I guess any text editor should do it :shrug:

No succes ,appears as PHP file ,have you tried from the forum as i do ?

[chris75]

I have reproduced it in my post above Mike :}

[FrenchMike]

I have reproduced it in my post above Mike :}

Thanks,curious ,looks like two sensors give different values.

You could have some faulty segments on the magnetic rings :shrug:

However,You can use my tests ,counting the number of variations for a complete turn :

could be interesting in comparison too

http://rovermg1.free.fr/rovermg/thumbnails/Ct70dqaLrSc9NqO8Ak4U.jpg (http://rovermg1.free.fr/rovermg/images/Ct70dqaLrSc9NqO8Ak4U.jpg)

[chris75]

However,You can use my tests ,counting the number of variations for a complete turn :



That could be tomorrow's job , rain permitting :} I have been making up a harness to insert into the sensor wiring for just that .
I think there should be 48 variations per turn ?

[FrenchMike]

That could be tomorrow's job , rain permitting :} I have been making up a harness to insert into the sensor wiring for just that .
I think there should be 48 variations per turn ?

I remember reading 46 on the Rave ...seems weird unless 2 segments are
blind to get a reference ?

[T-Cut]

I remember reading 46 on the Rave ...seems weird unless 2 segments are
blind to get a reference ?

There should be 46 impulses, evenly spaced, according to this study: http://www.the75andztclub.co.uk/forum/showthread.php?t=194740

TC

[jonc3725]

I take it you havnt knocked up the test loom yet Chris?
You should see 46 segments

[chris75]

Thank you all :} Hopefully I will get a chance to try out my test loom tomorrow . It was just that my Rave manual (ref 70-26 p 362 ) says "each contain a magnetic element incorporating 48 pole pairs " :shrug:

[chris75]

Well , I got the multimeter and my new test loom rigged up today and measured all 4 wheels ; very enlightening !
Firstly , I did measure 48 pulses and not 46 . That is what Rave led me to expect but not what the rest of you have found :shrug:
The results were :

Wheel ...... pulses ..... supply volts ...... signal range
F/R......... ..... 48 ......... 13................. 0.7 - 2.0v
R/R ........ ..... 48 ......... 12.9............... 1.2 - 2.6v
R/L ............... 2 or 3.. . 12.2 ............. 0.7 - 2.0v
F/L ............... 48 ......... 12.2.... .......... 0.7 - 1.9v


Clearly , the rear left is poorly as it didn't really record any pulses . I am still puzzled as to why I have no warning lights or error records ? :shrug:
I will replace hub and sensor .
Now the bad bit ! I recently , about 1000 miles ago , replaced the hub and sensor on the rear right to cure my ABS warning light problem . Whilst jacking the wheels up for the test I found that the new hub has a lot of play in it :eek:
That didn't last long and was supposed to be OEM ; I will be conversing with the supplier :} I thought this play would be the cause of my problem until I tested the rear left and got gibberish readings :shrug:
Never simple , is it ?
Thanks to you all for your inputs , thanks to TOAF for a handy bit of kit , and thanks to Jonc3725 for supplying the plug to make up my test lead :}

[Best_of_British]

Good result, at least you know what corner to concentrate on.

Sent from my GT-I9195 using Tapatalk

[FrenchMike]

Interesting but seems you get an intermittent issue since TOAD showed:

132;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h :shrug:

[chris75]

Interesting but seems you get an intermittent issue since TOAD showed:

132;16.75 km/h;16.63 km/h;16.94 km/h;16.94 km/h :shrug:

Don't you just love intermittent faults :mad:
I would have suspected debris from the backplate but I recently fitted new discs / pads and gave it a good clean then :shrug:
There is really nothing in the results I have got which explains the problem definitively , so I have to go on anything which is not apparently right !

[Phil-T4]

Still researching my ABS problem ! I have just been out for a run with TOAF connected and displaying live ABS data ie wheel speed . Only minor discrepancies ( < 3% ) between the 4 wheels observed , but puzzled by the readings ; at about 30 mph the 4 wheels were displaying about 16 kph on Toaf , which would be about 10 mph !
Any ideas why this is , or I have I found a fault :eek:
No errors are recorded.....

Because the ABS is a critical system, it will shut off comms to the diagnostic system to maintain its ability to monitor the system rather than take up cpu time for communications.

[jonc3725]

Good news mate. Glad to have helped.

Cheers for the clarification on the segments I could have sworn it was 46:duh::getmecoat::D

Are you sure the hub has not come loose on the side you have replaced.:shrug:

[chris75]

Are you sure the hub has not come loose on the side you have replaced.:shrug:

Yep , I'm sure :} It was torqued and staked , and still is :} Replacement is on its way from a very helpful supplier , and my plan is to fit that and test first before I interfere with the right rear with the funny readings !
We'll get there .