| 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 8 sec.
|
| Threshold Value |
- Downstream O2S voltage less than 0.65 V
|
| Case 2 |
DTC Strategy |
- Oscillation check: Test condition is checked at every 500 sec after oscillation check is performed
|
| Enable Conditions |
- Downstream O2S voltage less than 0.65 V for 100 sec.
- Fuel system status = Closed loop
- Engine speed greater than 1120 rpm and less than 3000 rpm
- Engine load greater than 20% less than 83 %
- Mass airflow greater than 20 kg/h
- EGT around downstream O2S greater than 700 °C (1292 °F) or O2S heater voltage greater than 9.2 V or Downstream O2S voltage greater than 0.5 and less than 0.4
|
| Threshold Value |
- If All secondary conditions met then Fuel system open loop control Lambda = 0.8 for 8 sec.
|
| Diagnosis Time |
|
| MIL On Condition |
|