Day 20 - Anti-lock braking systems(On car)

Vehicel: Mazda
Model: Familia
Year: 1998

ABS Wheel Speed Sensors

On the vehicle that you have been assigned does it use analogue or digital wheel sensors?
It use an analogue wheel sensors

How did you conclude that the wheel sensors were analogue or digital?
It has a toothed ring so we can conclude the wheel sensors are analogue.

Measure the air gap for each wheel sensor

Front Right: 0.406 inch
Front Left: 0.660 inch

Rear Right: 0.406 inch
Refar Left: 0.958 inch

Using an oscilloscope connect it to a wheel sensor and record the pattern shown.

This pattern is an analogue one. If there is a broken tooth on a wheel speed sensor ring, the above red pattern shows trace as a missing wave.

Using a Scan Tool

Using a scan tool gto to the ABS live data screen and note all the sensors, data and what it is telling you.