A/F sensor heater control signal

Fig 1: A/F Sensor Heater Control Signal Waveform

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• 1BY(+)-body ground(-)

Oscilloscope setting 

• 5 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

• Idle (after warm up and no load)