Conditions for Setting the DTC
- Engine coolant temperature (ECT) is higher than 70 °C (158 °F).
- Modeled catalyst temperature is higher than 500 °C (932 °F).
- HO2S2 control is normal.
- System is in closed loop condition.
- Catalyst diagnosis index is less than 0.063.
- No related DTCs are set.
- Fuel trim control values reached maximum limit value (639 ms) for 10 seconds during 30 seconds of fuel trim control phase.