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Vehicle speed output

ABS HU/CM terminal: Q (+) - AA (-)
Oscilloscope setting: 2 V/DIV (Y), 25 ms/DIV (X)
Vehicle condition: Driving 25 km/h [15.5 mph]
NOTE:
- As vehicle speed increases, period of wave will shortens.
  
  Fig 1: Inspecting With Using Oscilloscope (Vehicle Speed Output)
  Courtesy of MAZDA MOTORS CORP.