Input/turbine speed sensor (-) signal

PCM terminals 

• 1Q (+)-Negative battery terminal (-)

Oscilloscope setting 

• 500 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm-up
  Fig 1: Inspection Graph Of Input/Turbine Speed Sensor (-) Signal Using Oscilloscope

  Courtesy of MAZDA MOTORS CORP.