If there is not any signal activity, PCM 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. HO2S (S2) |
Enable Conditions |
•
Dew point end detected
•
Fuel feed back control active
•
Battery voltage is higher than 11V
•
Exhaust Gas temperature is higher than 350℃ and lower than 800℃
•
No upstream O2 sensor heater error
•
Oscillation Test not completed
•
Time duration for Target lamba = 0.9 (15 sec.)
•
Lambda feed back control value = 0.95~1.05
•
Rear O2 sensor heater monitoring - completed | |
Threshold Value |
•
Sensor voltage is lower than 0.65V | |
Diagnostic Time |
•
315 sec. | |
Mil On Condition |
•
3 driving cycles |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
