Signal Waveform & Data

Fig 1: Scantool Display - Signal Waveform Of Oxygen Sensors

Courtesy of KIA MOTORS AMERICA, INC.

If the accelerator pedal is suddenly released after engine is running at about 4000 RPM, the fuel supply will stop for a short period and the O2 sensor service data in the Hi-Scan (Pro) will display values 200mV or lower. When the accelerator pedal is suddenly pressed down, the voltage will reach 0.6 ~ 1.0 V. When engine idles again, the voltage will fluctuate between 200 mV or lower and 0.6 ~ 1.0 V. In this case, the O2 sensor can be considered as good.