Inspection Using An Oscilloscope (Reference) Wheel Speed: Notes

1. RF: G ( + ) - D (-)
2. RR: A ( + ) - B (-)
3. LF: I ( + ) - E (-)
4. LR: C ( + ) - F (-)

• Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X).
• Vehicle condition: Driving 30 km/h [18.6 MPH].

NOTE:

• As vehicle speed increases, period of wave shortens.
• If malfunctioning in the sensor rotor, wave profile will warp.

Fig 1: Identifying Wheel Speed Sensor Wave Pattern

Courtesy of MAZDA MOTORS CORP.