July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Engine Speed

ABS HU/CM terminal: S (+) - AA (-)
Oscilloscope setting: 2 V/DIV (Y), 25 ms/DIV (X)
Vehicle condition: Idle after warm-up. (Engine speed at approximately 650 RPM)

Fig 1: Engine Speed Wave Pattern

G01196988

Courtesy of MAZDA MOTORS CORP.