| 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 lower than 1kΩ or heater max heating or normal heating for higher than 75s.)
- 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 11V and lower than 16V
- No relevant DTC present
|
| Case 2 |
- Downstream O2 sensor operative readiness detected (sensor element resistance lower than 1kΩ or heater max heating or normal heating for higher than 75s.)
- Mass air flow integral after leaving fuel cut off more than 100g
- 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 10000Ω
- Battery voltage higher than 11V and lower than 16V
- No relevant DTC present
|
| Threshold Value |
Case 1 |
- Average of signal gradient less than 1000mV/s
|
| Case 2 |
- Average of signal gradient less than 1500mV/s
|
| Diagnostic Time |
Case 1 |
- 3 valid fuel cut off phases
|
| Case 2 |
- 3 valid diagnostic cycles
|
| MIL ON Condition |
|