High Pressure Fuel Pump Control (-) Signal

Fig 1: High Pressure Fuel Pump Control (-) Wave Pattern Signal

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• 1 DJ (+)-body ground (-)

Oscilloscope setting 

• 10 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up