Wheel speed

ABS/TCS HU/CM terminal:
1. RR: A (+) - B (-)
2. LR: C (+) - F (-)
3. RF: G (+) - D (-)
4. LF: I (+) - E (-)
Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X), AC range
Vehicle condition: Driving 30 km/h (18.6 mph)
NOTE:
- As vehicle speed increases, the wave period shortens.
- If there is malfunctioning in the sensor rotor, the wave profile warps.
Fig 1: Identifying Wheel Speed Oscilloscope Pattern
Courtesy of MAZDA MOTORS CORP.