DTC Setting Condition
| Item | DTC setting condition | |
|---|---|---|
| Main Action | Case1 | Signal plausibility check in rich condition (during catalyst purge after fuel cut off) |
| Case2 | Signal plausibility check in lean condition (when fuel cut off) | |
| Prerequisite Condition | Case1 | Engine coolant temperature over 73°C Downstream oxygen readiness detection status Preheating of the downstream oxygen sensor At least 4 g of intake air at the last fuel cut Downstream oxygen signal less than 0.3V at end of last fuel cut More than 150 g of intake air under partial load Catalyst temperature model above 400°C When entering the fuel cutoff, the downstream oxygen sensor signal is over 0.6V no related errors Battery Voltage 11 ~ 16V |
| Case2 | Downstream oxygen readiness detection status Preheating of the downstream oxygen sensor Intake air volume 12 to 250 g while fuel cutoff is in progress no related errors Battery Voltage 11 ~ 16V |
|
| Fault Determination | Case1 | If the maximum Downstream oxygen sensor voltage is less than 0.6V during catalyst purge after fuel cutoff |
| Case2 | When the voltage of the downstream oxygen sensor is over 0.3V in the fuel cutoff state | |
| Diagnosis Time | Case1 | Catalyst enrichment status after 3 valid fuel cuts |
| Case2 | 5 seconds | |
| Threshold Value for Warning Light | 2nd drive cycle | |