DTC P0140 Ho2S Circuit No Activity Detected (Bank 1 / Sensor 2): DTC Detecting Condition
DTC DETECTING CONDITION CHART
| Item |
Detecting Condition |
Possible Cause |
| DTC Strategy |
Case 1 |
- Signal plausibility with rich mixture (during catalyst purge after fuel cut-off)
|
- Poor connection or damaged harness
- HO2S contamination
|
| Case 2 |
- Signal plausibility with lean mixture (during fuel cut-off)
|
| Enable Conditions |
Case 1 |
- Coolant temperature >73°C (163°F)
- Downstream O2 sensor operative readiness detected
- Downstream O2 sensor pre-heating phase finished
- 4g < Integrated Mass Air Flow in last Fuel Cut-Off
- Downstream O2 sensor signal at end of last fuel cut off < 0.4V
- Integrated air mass flow in Part Load > 150g
- Minimum upstream O2 sensor voltage during Catalyst Purge phase > 0.6V
- Modeled catalyst temperature >400°C (752°F)
- No relevant failure
- 11V < Battery voltage < 16V
|
| Case 2 |
- Downstream O2 sensor operative readiness detected
- Downstream O2 sensor preheating phase finished
- 12g < Integrated mass air flow since fuel cut-off begin < 250g
- No relevant failure
- 10V< Battery voltage < 16V
|
| Threshold Value |
Case 1 |
- Max. downstream HO2S < 0.6V during catalyst purge after fuel cut-off
|
| Case 2 |
- Downstream HO2S > 0.3V during fuel cut-off phase
|
| Diagnostic Time |
Case 1 |
- 3 valid fuel cut-off followed by catalyst enrichment phases
|
| Case 2 |
|
| MIL On Condition |
|