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VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 10:08 am
by C. Ludwig
Doing an S6GP install. Car is equipped with VR wheelspeed sensors. These sensors are connected to a standalone ABS controller through the OE wiring. Would like to share those sensors with the S6 on the AN01-04 inputs. What is the proper way to wire them and not degrade the signal to either the ABS unit or Syvecs ECU? Thanks!
Re: VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 11:48 am
by pavlo
That might be tricky as the S6 biases the inputs via a pullup resistor and is not a true differential sensor. The effect it will have on the signal will depend on the input impedance of the OEM ABS controller and the internal resistance of the sensor. Without having already tested it, all you can really do is try it and see what happens, I would initially try a sensor and use a 0-5v input as although the sensor will be bi-polar, it may already get pulled up by the ABS controller.
Depending on the vehicle there may be an option to use a can bridge to input the wheelspeeds into the S6 from the OEM CAN system. If neither a 0-5v input or bipolar input works on the S6 you will need to look at 4 channel buffer to output signals to the S6 without affecting the sensor inputs to the ABS unit.
Re: VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 5:44 pm
by stevieturbo
Would something like this work ? It might stand less chance of confusing the base signal for the ABS
http://www.jbperf.com/dual_VR/v2_1.html
Then it would change the signal to digital ?
Re: VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 7:29 pm
by pavlo
That would do it perfectly, and for $6 shipped it's a steal!
Re: VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 8:43 pm
by TimH
$6 shipping, not shipped lol. But still a good find and a good price
Re: VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 10:23 pm
by pavlo
It did seem rather cheap!
But to solve that specific problem it should do it nicely.
Re: VR wheelspeed sharing?
Posted: Tue Jan 14, 2014 11:46 pm
by stevieturbo
On that same note...
Quoted from a user over on the DTA forum....with a find of the same nature.
Mark_r33 wrote:, I discovered something I think is quite a cool and easy solution recently that saves having to mount hall effect sensors on your hubs if you already have VR style ABS pickups out there.
The Mk4 Vauxhall Astra (and I am sure Corsa's etc) WITHOUT ABS was fitted with a nice little signal converter that kind of turns the VR sensor into a Hall effect one to output a signal and drive the speedo unit (the abs cars send a signal from the abs unit). This type of car, plenty in the scrappers;
It takes every full wave from the VR and turns it into a square pulse, which the DTA seems to read without issue. To be honest I am not certain on it's exact voltage output, as I am new to oscilloscopes, but it seems to be around 4 volts top to bottom, with 1 volt as its base voltage when there is no wheel speed, so 5 volts overall at its peak.
(On a side note, I at first thought it would output 12 volts due to me feeding it with 12 volts, and had planned to try feeding it 5 volts. )
Anyway, they can be found in the Astra under the steering column in the fuse box, and are the tall orange relay looking unit top left;
Part number can be seen here;
As for wiring it up, what I found worked was;
Pin
15 - 12 volts
31 - Ground (I also put my shield wire for the VR cable to this)
Out - Yep, output to ECU
IN1 & 2 - VR sensor connections. These seemed to work perfectly either way around for me, but I am yet to test at high speed. If it does fail at speed I plan first to try switching these around.
- Mark
Re: VR wheelspeed sharing?
Posted: Wed Jan 15, 2014 8:23 am
by pavlo
Thanks for the info Steve, that is great.
Re: VR wheelspeed sharing?
Posted: Wed Jan 15, 2014 12:36 pm
by stevieturbo
Weird...I just quoted his text and links. Not sure why the image cropped
Full part number is, apparently thats a Siemens number
09.185.826
PA6.6-GF25
Mark_r33 wrote:Good point, the Vauxhall No. is 9134755 I think.
There are other similar little circuits I found online to do the same job. Those are maybe the neatest.
Re: VR wheelspeed sharing?
Posted: Thu Jan 16, 2014 10:10 am
by Ryan.g
Those Siemens adaptors are what i use on the Supras, work a treat
Although 99% of ABS computers will work fine if you T into the + side of the ABS signal at ABS Ecu and then set the input to only 5v on the input selection in sensor setup with the Bipolar inputs on the S6GP. (no pull-up is applied then)
Ryan