| DTC Strategy |
Case 1 |
- Signal plausibility during fuel cut off
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- Related fuse blown or missing
- Contact resistance in connectors
- HO2S contamination
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| Case 2 |
- Signal plausibility during full load
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| Case 3 |
- Signal plausibility after fuel cut off
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| Enable Conditions |
Case 1 |
- (Downstream O2 sensor Voltage > 0.68V or < 0.21V) or Catalyst model temp > 500°C (932°F)
- Sensor preheating and full heating phases finished
- In fuel cut off phase
- In fuel cut off active
- 20g < Integrated mass air flow < 200g
- No relevant failure
- 10V < Battery voltage < 16V
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| Case 2 |
- (Downstream O2 sensor Voltage > 0.68V or < 0.21V) or Catalyst model temp > 500°C(932°F)
- Sensor preheating and full heating phases finished
- 70g < Integrated mass air flow since begin full load < 300g
- No relevant failure
- 11V < Battery voltage < 16V
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| Case 3 |
- Integrated mass air flow in last fuel cut off> 10g
- Integrated mass air flow in part load > 250g
- Coolant temperature > 74°C (165°F)
- Downstream O2 sensor signal at end of last fuel cut off < 0.25V
- Sensor preheating and full heating phases finished
- In Closed loop mode
- Minimum upstream lambda during Catalyst Purge phase < 0.98 (to ensure Rich mixture during Catalyst Purge Phase)
- Catalyst temperature > 348°C (658°F)
- No relevant failure
- 11V < Battery voltage < 16V
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| Threshold Value |
Case 1 |
- Voltage with fuel cut off > 0.1V
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| Case 2 |
- Voltage with full load < 0.70V
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| Case 3 |
- Sensor signal increase < 10mV
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| Diagnostic Time |
Case 1 |
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| Case 2 |
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| Case 3 |
- 5 after fuel cut off phase
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