Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)

Front HO2S heater control

- Terminal connected:1 V (+)-Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 50 ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)

Rear HO2S heater control

- Terminal connected: 2 A (+)-Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 5- ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)