| DTC Strategy |
- Characteristic monitoring
|
- Poor Connector Connection
- Faulty Upstream O2 Sensor
|
| Enable Condition |
Case 1 |
- Sensor pump current valid
- Downstream O2 sensor operative readiness detected (Downstream O2 sensor voltage lower than 0.25V or higher than 0.56V & Downstream O2 sensor max heating finished)
- Active test not activated
- Catalyst purge after fuel cut off not active
- Engine speed higher than 600 RPM
- Mass air flow lower than 83g/sec
- Exhaust gas temp. higher than 572°F (300°C) and lower than 1472°F (800°C)
- Stable driving condition
|
| Case 2 |
- No fuel cut off
- No full load
- No catalyst overheating protection
- Battery voltage higher than 11V and lower than 16V
|
| Threshold Value |
Case 1 |
- Upstream lambda (rich) below 0.9 and downstream O2 signal voltage below 0.2V (lean) and lambda controller in limit (-30%)
|
| Case 2 |
- Lambda value below 1.05 when lambda setpoint is 1.15
|
| Diagnostic Time |
Case 1 |
- 5 to 100s. depending on intake air mass
|
| Case 2 |
- 10s. after lambda setpoint shift to corresponding side
|
| MIL ON Condition |
|