07-23-2022, 09:51 PM
(07-23-2022, 02:47 PM)max_imp Wrote: To those who want to know what signal is produced by the rear wheel " abs " speed sensor here is a screenshot of it from my oscilloscope screen ( including the glare, sorry ).
The sensor has 10 volts supplied to it and when the wheel rotates the sensor pulls the 10 volts down to 7.5 volts to produce a 2.5volt peak to peak signal when the slots pass under the sensor which is connected to the speedometer in the cluster.
The reason the signal is not pulled down to 0 volt is because the internal circuitry of the sensor needs at least 5 volt to operate hence the pulldown to 7.5 volts,
The measurement was made by connecting two probes into the 2 pole connector behind the right hand sidecover and switching the ignition on and centerstand deployed.
The blue wire of the sensor is the positive and the white wire is connected to chassis ground at the instrument cluster.
I suspect a similar voltage pattern will be produced when the sensor is connected to an abs unit but since i don't have abs i can't verify this, here is the screenshot;
Not picture perfect but the essentials are there.
Cheers
Nice max.
This is the base line signal from the ABS encoder during normal rotation?
How is the signal elongated during a "wheel lock event"? i.e. an image of the signal