| Case1 |
Main Action |
- Characteristic line strong shift to lean
|
- Poor connection or harness damage
- Front HO2S
|
| 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 higher than 600 rpm.
- Mass air flow is less than 83 g/sec.
- Exhaust gas temperature (model) is between 300°C (572°F) and 800°C (1, 472°F).
|
| Threshold value |
- Upstream Lambda (lean) is higher than 1.1, Downstream O2 signal (rich) is higher than 0.75V.
- When the above conditions are fulfilled, mass air flow is integrated.
Malfunction is detected when the accumulated mass air flow reaches 300g. |
| Diagnosis Time |
|
| Case2 |
Main Action |
- Characteristic line middle shift to lean
|
| Prerequisite Condition |
- No fuel cut-off is activated.
- No full load is activated with 90% of accelerator pedal value.
- No catalyst overheating protection is activated.
- Battery voltage is between 11V and 16V.
|
| Threshold value |
- Active test symptom during lambda set point shift to rich (after detecting DTC P209700)
- Lambda vlaue is higher than 0.9 when lambda setpoint equals 0.8.
|
| Diagnosis Time |
- 10 seconds after lambda set point shifts to corresponding side.
|
| MIL-On Condition |
|