| DTC Strategy |
|
- Poor Connector Connection
- Air leak in Intake or Exhaust System
- Faulty Fuel system
- Faulty Downstream O2 Sensor
|
| Enable Condition |
Case 1 |
- Downstream O2 Sensor operative readiness detected (sensor element resistance < 1kΩ or heater max heating or normal heating for > 75 sec.)
- O2 sensor internal resistance less than or equal to 3000Ω
- Catalyst Temp. model higher than 752°F (400°C)
- Downstream O2 sensor signal at entry into fuel cut off higher than 0.6V
- Battery voltage higher than 11 V and lower than 16 V
- No relevant DTC present
|
| Case 2 |
- Downstream O2 Sensor operative readiness detected (sensor element resistance < 1kΩ or heater max heating or normal heating for > 75 sec.)
- Mass air flow integral after leaving fuel cut off more than 100 g
- Catalyst Temp. model higher than 752°F (400°C)
- 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 |
- Average of signal gradient less than 1000 mV/s
|
| Case 2 |
- Average of signal gradient less than 1500 mV/s
|
| Diagnostic Time |
Case 1 |
- 3 valid fuel cut off phases
|
| Case 2 |
- 3 valid diagnostic cycles
|
| MIL ON Condition |
|