| VERACRUZ(EN) >2013 > G 3.8 DOHC > Fuel System > Engine Control System > Heated Oxygen Sensor (HO2S)>Troubleshooting |
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Fig1) The signal
waveforms of front HO2S(the upper) and heater(the lower) at
idle
Fig2) The signal
waveforms of rear HO2S(the upper) and heater(the lower) at
idle
The HO2S requires a
minimum temperature to provide a closed loop fuel control system. So the
HO2S contains a heater element to reduce its warm-up time and ensure its
performance during all driving conditions. The PCM controls this heater
element by duty cycle. The main relay supplies voltage to the heater and
the PCM provides a ground circuit for activating the
heater. |
