DTC P0140 Ho2S Circuit No Activity Detected (Bank 1/Sensor 2): DTC Detecting Condition
DTC P0140 DETECTING CONDITION TABLE
| Item |
Detecting Condition |
Possible Cause |
| DTC strategy |
Case1) |
- Signal Plausibility with Rich mixture (during Catalyst Purge after Fuel Cut-off)
|
- Related fuse blown or missing
- Poor connection or damaged harness
- HO2S contamination
|
| Case2 |
- Signal Plausibility with Lean mixture (during Fuel Cut-Off)
|
| Case3) |
- Signal Plausibility during Full Load
|
| Enable Conditions |
Case1) |
- HO2S sensor operative readiness detected
- Integrated mass air flow in last fuel cut off > 4g
- Integrated mass air flow in part load > 250g
- Coolant temperature > 74 °C
- Downstream HO2S sensor signal at end of last fuel cut off < 0.25V
- Sensor preheating and full heating phases finished
- Minimum HO2S (S1) during Catalyst Purge phase < 0.98
- Catalyst temperature > 348°C (658°F)
- No relevant failure
- 11V < Battery voltage < 16V
|
| Case2) |
- HO2S sensor operative readiness detected
- 20g < Integrated mass air flow in last fuel cut off < 200g
- Sensor preheating and full heating phases finished
- No relevant failure
- 10V < Battery voltage < 16V
- Fuel Cut Off active
|
| Case3) |
- HO2S sensor operative readiness detected
- HO2S sensor pre-heating phase finished
- 70g < Integrated Mass Air Flow since begin Full Load < 300g
- No relevant failure
- 10V < Battery voltage < 16V
|
| Threshold Value |
Case1) |
|
| Case2) |
- Voltage with fuel cut > 0.1V
|
| Case3) |
- Voltage with Full load < 0.70V
|
| Diagnostic Time |
Case1) |
- 3 valid fuel cut-off phases
|
| Case2) |
|
| Case3) |
|
| MIL On Condition |
|