A/F sensor heater control

Fig 1: A/F Sensor Heater Control Voltage Signal Waveform

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• 2A(+) - body ground(-)

  Oscilloscope setting 

• 5 V/DIV (Y), 200 ms/DIV (X), DC range

  Vehicle condition 

• Idle (after warm up)