Inspection Using An Oscilloscope (Reference) Wheel speed

Fig 1: Wheel Speed Blinking Pattern

Courtesy of MAZDA MOTORS CORP.

• 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), 4 ms/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.