| DTC Strategy |
- Heater Performance Check.
|
- Poor connection
- Open or Short to ground in power circuit
- Damaged or corroded terminals
- HO2S (S1)
|
| Case 1 |
Enable Conditions |
- B+ greater than 10.7V and less than 16.0 V.
- Sensor heating time greater than 45 sec.
|
| Threshold Value |
- Ceramic Temp less than 720 °C (1328°F).
|
| Diagnostic Time |
|
| Case 2 |
Enable Conditions |
- Exhaust Temp greater than 450 °C (842 °F).
- Power of Sensor heating greater than 90 %.
- Sensor heating time greater than 50 sec.
- No Fuel Cut greater than 50 sec.
|
| Threshold Value |
- Ceramic Temp less than 720 °C (1328 °F).
|
| Diagnostic Time |
|
| Case 3 |
Enable Conditions |
- Exhaust Temp greater than 450 °C (842 °F).
- Sensor heating time greater than 50 sec.
- No Fuel Cut greater than 50 sec.
|
| Threshold Value |
- Ceramic Temp less than 640 °C (1184 °F).
|
| Diagnostic Time |
|
| MIL ON Condition |
|
| * S1: upstream oxygen sensor/S2: downstream oxygen sensor |