Signal Waveform & Data

Fig 1: Display - Normal Waveforms Of Upstream HO2S (Upper) And Downstream HO2S (Lower) - Chassis Ground Used

Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: Display - Normal Waveforms Of Upstream HO2S (Upper) And Downstream HO2S (Lower) - Sensor Ground Used

Courtesy of HYUNDAI MOTOR AMERICA

Fig 3: Display - Normal Graph Of Upstream HO2S And Downstream HO2S At Idle

Courtesy of HYUNDAI MOTOR AMERICA

After warming-up, if accelerator pedal is released suddenly around 4000 RPM, the HO2S signal reading will be lower than 200 mV resulting from fuel cut-off for the moment. Conversely, if accelerator pedal is suddenly depressed, HO2S signal reading will be around 0.6V ~1.0V. At idle, normal HO2S signal will switch from lean to rich at 3 Hz. With higher engine RPM the signal frequency will increase.