Generator field coil control signal

PCM terminals 

• 2AQ(+)-2AA(-)

Oscilloscope setting 

• 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (engine speed approx. 650 rpm, no load)

Fig 1: Generator Field Coil Control Signal Pattern

Courtesy of MAZDA MOTORS CORP.