Oscilloscope Patterns and Waveforms

HO2S (front) signal (California emission regulation applicable ATX model)




- PCM terminals: G2AD(+)-body ground(-)
- Oscilloscope setting: 0.1 V/DIV (Y), 400 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm up (no load, P/S off, A/C off)

HO2S (rear) heater control




- PCM terminals: 2BE(+)-body ground(-)
- Oscilloscope setting: 2 V/DIV (Y), 1 s/DIV (X), DC range
- Vehicle condition: Idle (immediately after starting the engine)

HO2S (front) heater control




- PCM terminals: 2BG(+)-body ground(-)
- Oscilloscope setting: 2 V/DIV (Y), 500 minutes/DIV (X), DC range
- Vehicle condition: Idle (immediately after starting the engine)