Signal Waveform & Data

Fig 1: Screen Display - Normal Data Of HO2S (CH A1: VN, CH A2: VG, CH B1: Heater And CH B2: VIP)

Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: Screen Display - Normal Data Of HO2S Heater At Engine Idle Condition

Courtesy of HYUNDAI MOTOR AMERICA

Fig 3: Screen Display - Normal Data Of HO3S Heater At Engine (3947 RPM)

Courtesy of HYUNDAI MOTOR AMERICA

The output voltage of front HO2S changes continuously according to air/fuel ratio. The ECM (PCM) controls fuel amount based on this value. Preheating is necessary for HO2S normal operation. A heater unit is installed in each HO2S. The ECM (PCM) can control air/fuel ratio with the output signal of HO2S simultaneous with engine run by reducing preheating time. The HO2S power source is the engine control relay. ECM (PCM) operates heater by ground control.