| Case1 |
DTC Strategy |
- Response rate check at entry in fuel cut-off (rich-to-lean)
|
- Leak in intake or exhaust system
- Faulty fuel system
- Upstream and downstream HO2S connections reversed.
- Poor connection or damaged harness
- HO2S contamination
|
| Enable Condition |
- HO2S operative readiness is detected
- HO2S internal resistance is lower than 3000Ω
- Integrated O2 load at not R2L is greater than 0.8g
- Catalyst temperature model is greater than 487°C (908.6°F)
- Downstream HO2S signal is greater than 0.6V at entry into fuel cut-off
- Battery voltage is between 11V and 16V
- Mass air flow threshold for diagnosis of the switching gradients is between 10kg/h and 50kg/h
|
| Threshold Value |
- Signal gradient from 0.6V to 0.3V at entry in fuel cut off out of range
|
| Diagnostic Time |
- 3 valid fuel cut-off phases
|
| Case2 |
DTC Strategy |
- Response rate check after leaving fuel cut-off (lean to rich)
|
| Enable Condition |
- HO2S operative readiness is detected
- Mass air flow integral, after leaving fuel cut-off, is greater than 100g
- Mass air flow integral is between 10g and 250g
- Catalyst temperature model is greater than 487°C (908.6°F)
- Exhaust gas temperature model, at sensor location, is greater than 400°C (752°F)
- Battery voltage is between 11V and 16V
- HO2S internal resistance is lower than 3000Ω
|
| Threshold Value |
- Signal gradient from 0.3V to 0.6V after leaving fuel cut off out of range
|
| Diagnostic Time |
- 3 valid diagnostic cycles
|
| MIL ON Condition |
|