| Case 1 |
DTC Strategy |
|
- Poor connection
- Open or short to ground in harness
- HO2S(S1/S2)
- PCM
- Exhaust leaks
|
| Enable Conditions |
- Battery voltage greater than 10.7 V
- Lambda = 0.8 for 8s.
|
| Threshold Value |
- Downstream HO2S voltage less than 0.65 V
|
| Case 2 |
DTC Strategy |
- Oscillation check: Test condition is checked every 500s after oscillation check is performed
|
| Enable Conditions |
- Downstream HO2S voltage less than 0.65V for 100s
- Fuel system status = Closed loop
- Engine speed between 1120 - 3000rpm
- Engine load between 20 - 83%
- Mass airflow greater than 20 kg/h
- Exhaust Gas Temperature (EGT) around downstream HO2S greater than 700°C (1292°F) or HO2S heater voltage greater than 9.2V or downstream HO2S voltage greater than 0.5V and less than 0.4V
|
| Threshold Value |
- If All secondary conditions met then fuel system open loop control Lambda = 0.8 for 8s
|
| Diagnosis Time |
|
| MIL On Condition |
|