If the sensor output is below 0.06 V under enable conditions, ECM sets DTC P0137.
( This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first. )
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Signal check, low | 1. Poor connection 2. Short to ground in signal circuit 3. S2 | |
General Enable Conditions |
•
Dew point end detected
•
Battery voltage > 11V
•
Exhaust Gas temperature = 350℃~800℃
•
No upstream O2 sensor heater error | ||
Case1 | Enable Conditions |
•
Engine speed : 1200~2520 rpm
•
Rear O2 sensor feed back control - active | |
DiagnosticTime |
•
25 sec | ||
Case2 | Enable Conditions |
•
Sensor in cold condition | |
DiagnosticTime |
•
0.1 sec | ||
Threshold Value |
•
Sensor voltage < 0.06V | ||
MIL ON Condition |
•
3 driving cycle | ||
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
