A/F sensor heater control

PCM terminals 

• 2A(+)-body ground(-)

Oscilloscope setting 

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

Vehicle condition 

• Idle (immediately after starting the engine)

Fig 1: Display A/F Sensor Heater Control Signals

Courtesy of MAZDA MOTORS CORP.