| DTC Strategy |
- Heater performance check.
|
- Poor connection
- Open or Short to ground in power circuit
- Damaged or corroded terminals
- HO2S upstream (S1)
|
| Case 1 |
Enable Conditions |
- Battery voltage between 10.5 - 16V
- Sensor heating time greater than 45 seconds.
|
| Threshold Value |
- Ceramic temperature less than 720°C (1328°F).
|
| Diagnostic Time |
|
| Case 2 |
Enable Conditions |
- Exhaust temperature greater than 450°C (842°F).
- Power of Sensor heating greater than 90 %.
- Sensor heating time greater than 50 seconds.
- No Fuel Cut greater than 50 seconds.
|
| Threshold Value |
- Ceramic temperature less than 720°C (1328°F).
|
| Diagnostic Time |
|
| Case 3 |
Enable Conditions |
- Exhaust temperature greater than 450°C (842°F).
- Sensor heating time greater than 50 seconds.
- No Fuel Cut greater than 50 seconds.
|
| Threshold Value |
- Ceramic temperature less than 640°C (1184°F).
|
| Diagnostic Time |
|
| MIL ON Condition |
|
| * S1: upstream oxygen sensor/S2: downstream oxygen sensor |