Fuel injection control signal

PCM terminals 

• Fuel injector No. 1: 2A (+)-Negative battery terminal (-)
• Fuel injector No. 2: 2B (+)-Negative battery terminal (-)
• Fuel injector No. 3: 2C (+)-Negative battery terminal (-)
• Fuel injector No. 4: 2H (+)-Negative battery terminal (-)

Oscilloscope setting 

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

Vehicle condition 

• idle (after warm up)

Fig 1: Fuel Injection Control Signal Chart

Courtesy of MAZDA MOTORS CORP.