If there is not any signal activity, ECM sets DTC P0140.
(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 no activity detect | 1. Poor connection 2. Open or short in signal circuit 3. S2 |
Enable Conditions |
•
Dew point end detected
•
Battery voltage > 11V
•
Exhaust Gas temperature = 350℃~800℃
•
No upstream O2 sensor heater error
•
Oscillation Test not completed
•
Fuel feed back control active
•
time duration for Target lamba = 0.9 (15sec)
•
Lambda feed back control value = 0.95~1.05
•
Rear O2 sensor heater monitoring - completed | |
Threshold Value |
•
Sensor voltage < 0.65V | |
Diagnostic Time |
•
315 sec | |
MIL ON Condition |
•
3 driving cycle |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
