| DTC Strategy |
Case 1 |
- Signal plausibility with rich mixture (during catalyst purge after fuel cut-off)
|
- Poor connector connection
- Faulty downstream O2 sensor circuit
- Faulty downstream O2 sensor
|
| Case 2 |
- Signal rationality with lean mixture (during fuel cut-off)
|
| Enable Condition |
Case 1 |
- ECTS is more than 73°C (163°F)
- Downstream HO2S operative readiness detected
- Downstream HO2S pre-heating phase finished
- Integrated MAFS in last fuel cut-off is more than 4g
- Downstream HO2S signal at end of last fuel cut off is less than 0.3V
- Integrated air MAFS in Part Load is more than 150g
- Minimum upstream HO2S voltage during catalyst purge phase is more than 0.6V
- Modeled catalyst temperature is more than 400°C (752° F)
- No relevant failure
- Battery voltage between 11 and 16V
|
| Case 2 |
- Downstream HO2S operative readiness detected
- Downstream HO2S pre-heating phase finished
- Integrated MAFS since fuel cut-off begin between 12 and 250g
- No relevant failure
- Battery voltage between 10 and 16V
|
| Threshold Value |
Case 1 |
- Max. downstream HO2S is less than 0.6V during catalyst purge after fuel cut-off
|
| Case 2 |
- Downstream HO2S is more than 0.3V during fuel cut-off phase
|
| Diagnostic Time |
Case 1 |
- 3 valid fuel cut-off followed by catalyst enrichment phases
|
| Case 2 |
|
| MIL ON Condition |
|