| DTC Strategy |
|
- Poor Connector Connection
- Air leak in Intake or Exhaust System
- Faulty Fuel system
- Faulty Downstream O2 Sensor
|
| Enable Condition |
Case 1 |
- O2 sensor operative readiness is detected
- O2 sensor internal resistance less than or equal to 3000Ω
- Integrated O2 load at not R2L is greater than 0kJ
- Catalyst temperature model is greater than 487°C (908.6°F)
- Downstream O2 sensor signal at entry into fuel cut off higher than 0.6V
- Battery voltage higher than 11V and lower than 16V
- Mass air flow threshold for diagnosis of the switching gradients is between 10 kg/h and 50 kg/h
|
| Case 2 |
- O2 sensor operative readiness is detected
- Mass air flow integral after leaving fuel cut off more than 100g
- Mass air flow integral is between 10 kg/h and 250 kg/h
- Catalyst temperature model is greater than 487°C (908.6°F)
- Exhaust gas Temp. model at sensor location higher than 752°F (400°C)
- O2 sensor internal resistance less than or equal to 3000Ω
- Battery voltage higher than 11 V and lower than 16 V
- No relevant DTC present
|
| Threshold Value |
Case 1 |
- When the response time of the downstream HO2S signal is greater than 1500 mV/s at entry in fuel cut off out of range
|
| Case 2 |
- When the response time of the downstream HO2S signal is less than 1500 mV/s at during diagnostic
|
| Diagnostic Time |
Case 1 |
- 3 valid fuel cut off phases
|
| Case 2 |
- 3 valid diagnostic cycles
|
| MIL ON Condition |
|