This DTC sets when an open or short circuit is detected or the HO2S heater current draw exceeds a calibrated limit.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Heater Performance Check | 1. Poor connection 2. Open or Short to ground in power circuit 3. Damaged or corroded terminals 4. S1 | |
Case 1 | Enable Conditions |
•
10.5 V < B+ < 16.0 V
•
Sensor heating time > 45 sec. | |
Threshold Value |
•
Ceramic Temp < 720 ℃(1328°F) | ||
Diagnostic Time |
•
3 sec. | ||
Case 2 | Enable Conditions |
•
Exhaust Temp > 450 ℃(842 °F)
•
Power of Sensor heating > 90 %
•
Sensor heating time > 50 sec.
•
No Fuel Cut > 50 sec. | |
Threshold Value |
•
Ceramic Temp < 720 ℃(1328 °F) | ||
Diagnostic Time |
•
60 sec. | ||
Case 3 | Enable Conditions |
•
Exhaust Temp > 450 ℃(842 °F)
•
Sensor heating time > 50 sec.
•
No Fuel Cut > 50 sec. | |
Threshold Value |
•
Ceramic Temp < 640 ℃(1184 °F) | ||
Diagnostic Time |
•
10 sec. | ||
Mil On Condition |
•
2 driving cycles | ||
