The ECM/PCM sets DTC P0140 when it senses that resistance value of downstream O2 sensor heater is higher than threshold value.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal Plausibility with lean mixture(during fuel cut off) | 1. Poor connection or damaged harness 2. HO2S contamination |
Enable Conditions |
•
Downstream O2 sensor operative readiness detected * same as the conditions of P0136
•
Downstream O2 sensor pre-heating phase finished
•
Integrated mass air flow > 500g since fuel cut off begin < 250g
•
10V < Battery voltage < 16V | |
Threshold Value |
•
Downstream O2 Sensor Voltage > 0.2V | |
Diagnostic Time |
•
5 sec. | |
Mil On Condition |
•
2 driving cycles. |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
