Fuel Injector Signal (-)

Injector driver module terminals 

• Fuel injection No.1:1 E(+) - Body ground(-)
• Fuel injection No.2:1 B(+) - Body ground(-)
• Fuel injection No.3:1 C(+) - Body ground(-)
• Fuel injection No.4:1 D(+) - Body ground(-)

Oscilloscope setting 

• 25 V/DIV (Y), 0.2 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 1: Identifying Waveform - Fuel Injector Signal (-)

  Courtesy of MAZDA MOTORS CORP.