Oscilloscope Patterns and Waveforms

Inspecting Voltage Wave Forms With Oscilloscope:

PROCEDURE
Use the following method to observe the output voltage wave form from each wheel sensor with an oscilloscope
- Start the engine, and rotate the front wheels by engaging 1st gear (vehicles with manual transaxle) or D range (vehicles with automatic transaxle). Turn the rear wheels manually so that they rotate at a constant speed.

NOTE:
1. Check the connection of the sensor harness and connector before using the oscilloscope.
2. The wave form measurements can also be taken while the vehicle is actually moving.
3. The output voltage will be low when the wheel speed is low, and similarly it will be higher as the wheel speed increases.