P0140: O2 Sensor Circuit No Activity Detected (Bank 1/Sensor 2): DTC Detecting Condition
DTC DETECTING CONDITION CHART
| Item |
Detecting Condition |
Possible Cause |
| Case1) |
DTC Strategy |
- Signal plausibility during fuel cut off
|
- Related fuse blown or missing
- Contact resistance in connectors
- HO2S contamination
|
| Enable Conditions |
- (VLS_DOWN > 0.68V or < 0.21V) or Catalyst model temp > 500°C
- Sensor preheating and full heating phases finished
- In fuel cut off phase
- In fuel cut off active
- 20g < Integrated mass air flow < 200g
- No relevant failure
- 10V < Battery voltage < 16V
|
|
| Threshold Value |
- Voltage with fuel cut off > 0.1V
|
|
| Diagnostic Time |
|
|
| Case2) |
DTC Strategy |
- Signal plausibility during full load
|
|
| Enable Conditions |
- (VLS_DOWN > 0.68V or < 0.21V) or Catalyst model temp > 500°C
- Sensor preheating and full heating phases finished
- 70g < Integrated mass air flow since begin full load < 300g
- No relevant failure
- 11V < Battery voltage < 16V
|
|
| Threshold Value |
- Voltage with full load < 0.70V
|
|
| Diagnostic Time |
|
|
| Case3) |
DTC Strategy |
- Signal plausibility after fuel cut off
|
|
| Enable Conditions |
- Integrated mass air flow in laser fuel cut off > 8g
- Integrated mass air flow in part load > 250g
- Coolant temperature > 74°C (165°F)
- Downstream O2 sensor signal at end of last fuel cut off < 0.25V
- Sensor preheating and full heating phases finished
- In Closed loop mode
- Minimum upstream lambda during Catalyst Purge phase < 0.98(to ensure Rich Mixture during Catalyst Purge Phase)
- Catalyst temperature > 348°C (658°F)
- No relevant failure
- 11V < Battery voltage < 16V
|
|
| Threshold Value |
- MAX voltage with after full cut off < 0.55V
|
|
| Diagnostic Time |
- 3 valid fuel cut-off followed by catalyst enrichment phases
|
|
| Mil On Condition |
|
|