Signal Waveform & Data

Fig 1: Normal Waveforms Of Front HO2S (Upper) & Rear HO2S (Lower)

Courtesy of HYUNDAI MOTOR CO.

After warming-up, if accelerator pedal is released suddenly around 4000 RPM, the HO2S signal reading will be lower than 200mV resulting from Fuel cut-off for the moment. Conversely, if suddenly accelerator pedal is depressed, HO2S signal reading will be around 0.6V ~1.0V. At idle, Normally HO2S signal will switch from lean to rich with 3 Hz. And as racing, Its frequency rises.