Fuel Injector Signal (+)

Injector driver module terminals 

• Fuel injection No.1:1 F(+) - Body ground(-)
• Fuel injection No.2:1 A(+) - Body ground(-)
• Fuel injection No.3:1 A(+) - Body ground(-)
• Fuel injection No.4:1 F(+) - 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.