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 cutoff 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.