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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.