Pressure control solenoid (-) signal

PCM terminals 

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

Oscilloscope setting 

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

Vehicle condition 

• All of the following conditions are met.
  • Ignition switch is turned to the ON position. (engine off)
  • P or N position
  • CTP
    Fig 1: Inspection Graph Of Pressure Control Solenoid (-) Signal Using Oscilloscope

    Courtesy of MAZDA MOTORS CORP.