| DETECTION CONDITION |
- Oxygen sensor malfunction is detected by measuring of the average frequency of oxygen sensor signal, time required to pass from rich to lean, time required to pass from lean to rich.
- The average frequency of oxygen sensor signal is more than the threshold value.
MONITORING CONDITIONS
- EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode
- Following conditions are met:
- A/F sensor heater monitor is completed.
- Fuel system loop status is closed loop fuel control.
- ECT sensor and A/F sensor heater are normal
- Engine speed: 1,200-3,500 rpm
- Charging efficiency: 16-63 %
- Engine coolant temperature: above 60 °C {140 °F}
- Intake airflow amount: 5-40 g/s {0.7-5.2 lb/min}
Diagnostic support note
- This is an intermittent monitor. (A/F sensor, HO2S)
- The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
- The DTC is stored in the PCM memory.
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