| Case 1 |
DTC Strategy |
- Characteristic line strong shift to lean
|
- Poor connection or damaged harness
- Front HO2S
|
| Enable Conditions |
- 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 6000 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).
- Stable driving condition:
- Difference between actual RPM and filtered RPM is less than 500 RPM.
- Difference between actual air mass and filtered air mass is less than 0.4 g/rev.
- Difference between actual lambda and filtered lambda is less than 15%.
|
| Threshold Value |
- Upstream lambda (lean) is higher than 1.1, and downstream O2 signal (rich) is higher than 0.75V.
- When above conditions are fulfilled, mass air flow is integrated. Malfunction is detected when the accumulated mass air flow reaches 300 g.
|
| Diagnosis Time |
- 5 ~ 100 seconds (depends on intake air mass)
|
| Case 2 |
DTC Strategy |
- Characteristic line middle shift to lean
|
| Enable Conditions |
- No fuel cut-off
- No full load
- No catalyst overheating protection
- Battery voltage is between 11V and 16V.
|
| Threshold Value |
- Active test symptom during shift of lambda set point to rich (after P2097-00 detection)
- Lambda value is higher than 0.9 when lambda set point is 0.8.
|
| Diagnosis Time |
- 10 seconds after lambda set point shift to corresponding side.
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| MIL On Condition |
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