ABS Demonstrators

I used the wiring diagram above to find the wheel speed sensor pinout connections to the ecu.

left front:
ecu pin:4 and 5
left rear:
ecu pin:7 and 9
right front:
ecu pin:11 and 21
right rear
ecu pin:24 and 26

The type of speed sensor in this ABS unit is a magnetic inductor type sensor.It works with a passing magnet induses current through the windings.It has a magnet that creates a magnetic field.
Iused a tech tronic oscilloscope for the following tasks.

I had to get the osciliscope waveform for each of thewheel speed sensors.
The first sensor I did was the front right

front right

front left:

left rear:

right rear:

I got all the waveforms above from:http://amirs4825.blogspot.com/2010/11/abs-demonstrators.html
The waveforms arnt all the same,the left side looks identical and the right side also looks identical but the right side voltage is alot higher than the left side.

with wheel speed sensor spinning I measured the ac volts and got result of:

left front: 3.593v
left rear: 2.695v
right front: 4.473v
right rear: 5.141v

A multimeter wont be as acurate as a oscilloscope.The advantages of using a oscilloscope is that an oscilloscope shows a patter/waveform,this waveform can show you the maximum voltage outputs,peak to peak voltage and frequency ect.These waveforms allow you to visually see any faults in the circuit being tested,can aloso show changes in the circuit.If you are able to read these patterns it makes it alot more simple and acurate to diagnose fault vurther than using a multimeter.