Wheel speed

ABS HU/CM terminal:
1. RF: P (+)-O (-)
2. RR: N (+)-L (-)
3. LF: R (+)-Q (-)
4. LR: T (+)-S (-)
Oscilloscope setting: 0.2 V/DIV (Y), 4ms/DIV (X), AC range
Vehicle condition: When turned 1 revolution per second
NOTE:
- As vehicle speed increase, period of wave shorten.
- If malfunctioning in the sensor rotor, wave profile warp.
Fig 1: Inspection Using An Oscilloscope
Courtesy of MAZDA MOTORS CORP.