DTC P0140 Ho2S Circuit No: Activity Detected (Bank 1/Sensor 2): DTC Detecting Condition
DTC DETECTING CONDITION CHART
| Item |
Detecting Condition |
Possible Cause |
| Case 1) |
DTC Strategy |
- Signal plausibility during fuel cut off
|
- Related fuse blown or missing
- Contact resistance in connectors
- HO2S contamination
|
| Enable Conditions |
- (Downstream O2 Sensor voltage > 0.56V or < 0.25V) or Catalyst model temperature > 550°C(1022°F)
- Sensor preheating and full heating phases finished
- In fuel cut off phase
- Intergrated Mass Air Flow since begin > 20g
- In fuel cut off active
- No relevant failure
- 10V < Battery voltage < 16V
|
| Threshold Value |
- Voltage with fuel cut off > 0.1V
|
| Diagnostic Time |
|
| Case 2) |
DTC Strategy |
- Signal plausibility after fuel cut off
|
| Enable Conditions |
- Coolant temperature > 74°C(165°F)
- Downstream O2 Sensor operative readiness detected
- Downstream O2 sensor pre-heating phase fiished
- Integrated air mass flow in Part Load > 250g
- Minimum upstream O2 sensor signal during Catalyst Purge phase > 0.7V (to ensure Rich mixture during Catalyst Purge Phase)
- Catalyst temperature > 348°C (658°F)
- No relevant failure
- 11V < Battery voltage < 16V
|
| Threshold Value |
- Max. Downstream O2 Sensor voltage < 0.55V
|
| Diagnostic Time |
- 3 valid fuel cut-off followed by catalyst enrichment phases
|
| Mil On Condition |
|