High Pressure Fuel Pump Control (-) Signal

Fig 1: High Pressure Fuel Pump Control (-) Output Voltage Signal Graph

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• 1EF(+)-body ground(-)

  Oscilloscope setting 

• 10 V/DIV (Y), 50 ms/DIV (X), DC range

  Vehicle condition 

• Idle after warm up