Fuel injection control (-) signal

Fig 1: Drive-By-Wire Control Signal Waveform

Courtesy of MAZDA MOTORS CORP.

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
  Fig 2: Fuel Injection Control Signal Waveform

  Courtesy of MAZDA MOTORS CORP.