Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)

HO2S signal




- PCM terminals
- Front HO2S (right bank): 18 (+) - 26 (-)
- Front HO2S (left bank): 19 (+) - 26 (-)
- Rear HO2S (right bank): 44 (+) - 26 (-)
- Rear HO2S (left bank): 45 (+) - 26 (-)

- Oscilloscope setting
- 0.5 V/DIV (Y), 500 ms/DIV (X), DC range

- Vehicle condition
- Idle after warm up (no load)

HO2S heater control signal




- PCM terminals
- Front HO2S heater (right bank): 83 (+) - 26 (-)
- Front HO2S heater (left bank): 84 (+) - 26 (-)
- Rear HO2S heater (right bank): 57 (+) - 26 (-)
- Rear HO2S heater (left bank): 58 (+) - 26 (-)

- Oscilloscope setting
- 5 V/DIV (Y), 500 ms/DIV (X), DC range

- Vehicle condition
- Idle after warm up (no load)