Fuel injection control (-) signal

Fig 1: Fuel Injection Control (-) Signal Oscilloscope Graph

Courtesy of MAZDA

PCM terminals 

• Fuel Injection No. 1: 1DO(+)-body ground(-)
• Fuel Injection No. 2: 1DW(+)-body ground(-)
• Fuel Injection No. 3: 1EA(+)-body ground(-)
• Fuel Injection No. 4: 1DS(+)-body ground(-)

  Oscilloscope setting 

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

  Vehicle condition 

• Idle after warm up