Fuel injection control

PCM terminals (California emission regulation applicable model) 

Fuel injection No.1: 2AW(+)-1AZ(-) 

Fuel injection No.2: 2AS(+)-1AZ(-) 

Fuel injection No.3: 2AX(+)-1AZ(-) 

Fuel injection No.4: 2AT(+)-1AZ(-) 

PCM terminals (except for California emission regulation applicable model) 

• Fuel injection No.1: 2BB(+)-1AZ(-)
• Fuel injection No.2: 2BC(+)-1AZ(-)
• Fuel injection No.3: 2BD(+)-1AZ(-)
• Fuel injection No.4: 2AZ(+)-1AZ(-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (engine speed approx. 650 rpm, no load)
  Fig 1: Inspection Graph Of Fuel Injection Control Signal Using Oscilloscope

  Courtesy of MAZDA MOTORS CORP.