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Inspection Using An Oscilloscope (Reference)
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A/F sensor heater control
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A/F sensor heater control
Fig 1: A/F Sensor Heater Control Voltage Signal Waveform
PCM terminals
2A(+)-body ground(-)
Oscilloscope setting
5 V/DIV (Y), 200 ms/DIV (X), DC range
Vehicle condition
Idle (after warm up)