| Case 1 |
Main Action |
- Characteristic line strong shift to rich
|
- Poor Connection
- Faulty HO2S
- Restricted of fuel filter in fuel pump
- Faulty ECM
|
| Prerequisite Condition |
- Upstream O2 sensor operative readiness is detected.
- Downstream O2 sensor operative readiness is detected.
- Active test is not activated.
- Catalyst purge after fuel cut off is not activated.
- Engine speed is faster than 576 rpm.
- Mass air flow is lower than 83 g/sec.
- Exhaust gas temperature model is between 300°C (572°F) and 800° C (1472°F)
- Battery voltage is between 11V and 16V
|
| Threshold Value |
- Upstream lambda (rich) is lower than 0.9 and Downstream O2 signal (lean) is lower than 0.2V
|
| Diagnosis Time |
|
| Case 2 |
Main Action |
- Characteristic line middle shift to rich
|
| Prerequisite Condition |
- Fuel cut off is not functioning.
- Full load is not activated (Accelerator pedal value is less than 90%).
- Catalyst overheating prevention is not activated.
- Battery voltage is between 11V and 16V
|
| Threshold Value |
- Lambda value is smaller than 1.05 when lambda set point is equal to 1.15.
|
| Diagnosis Time |
- 10 seconds after lambda set point shift to corresponding side
|
| MIL On Condition |
|