Signal Waveform & Data

Fig 1: Screen Display - Normal Data Of HO2S Heaters At Idle

Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: Screen Display - Data Of HO2S Heaters At Open Condition In HO2S (B2S1) Circuit (0A)

Courtesy of HYUNDAI MOTOR AMERICA

Fig 3: Screen Display - Signal Waveforms Of Front HO2S (Upper) And Heater (Lower) At Idle (Chassis Ground Used)

Courtesy of HYUNDAI MOTOR AMERICA

Fig 4: Screen Display - Signal Waveforms Of Front HO2S (Upper) And Heater (Lower) At Idle (Sensor Ground Used)

Courtesy of HYUNDAI MOTOR AMERICA

Fig 5: Screen Display - Signal Waveforms Of Rear HO2S (Upper) And Heater (Lower) At Idle (Chassis Ground Used)

Courtesy of HYUNDAI MOTOR AMERICA

Fig 6: Screen Display - Signal Waveforms Of Rear HO2S (Upper) And Heater (Lower) At Idle (Sensor Ground Used)

Courtesy of HYUNDAI MOTOR AMERICA

The output voltage of front HO2S is changed continuously according to air/fuel ratio, PCM controls fuel amount based on this value. Preheating is necessary for HO2S normal operation. Therefore heater unit is installed in HO2S, PCM can control air/fuel ratio with the output signal of HO2S simultaneous with engine run by reducing preheating time. PCM controls heater with duty cycle. HO2S' power source is main relay and PCM operates heater by ground control.