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. 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 ℃(1328°F) | ||
Diagnostic Time |
•
3 sec. | ||
Case 2 | Enable Conditions |
•
Exhaust Temp greater than 450 ℃(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 ℃(1328 °F) | ||
Diagnostic Time |
•
60 sec. | ||
Case 3 | Enable Conditions |
•
Exhaust Temp greater than 450 ℃(842 °F)
•
Sensor heating time greater than 50 sec.
•
No Fuel Cut greater than 50 sec. | |
Threshold Value |
•
Ceramic Temp less than 640 ℃(1184 °F) | ||
Diagnostic Time |
•
10 sec. | ||
MIL ON Condition |
•
2 driving cycles | ||
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
