HO2S heater control signal

Fig 1: HO2S Heater Control Signal Oscilloscope Graph

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• 2C(+)-body ground(-)

Oscilloscope setting 

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

Vehicle condition 

• Idle (immediately after starting engine and no load)