5.1.2 Monitoring Structure
Catalyst Monitoring Operation
| Component/System | Fault Codes | Monitoring Strategy Description | Malfunction Criteria | Threshold value | Secondary Parameter | Enable Conditions | Time Required | MIL Illumination |
|---|---|---|---|---|---|---|---|---|
| Catalyst Bank 1 Bank 2 |
- P0420 P0430 |
Oxygen storage capability | Comparison of calculated lambda-cycle to measured lambda-cycle from rear oxygen sensor Hydrocarbon (HC) Emissions (1.75 x standard) |
> 6.02 during 59 lambda controller cycles | ECT Fuel system status Vehicle speed Engine speed and Engine load Engine speed Engine load Lambda Mean Value Delta accelerator pedal movement Catalyst temperature (model) Following Over Run Fuel Cut Off (ORFCO) |
>60°C closed loop 3.1 < vehicle speed < 124 mph 1280 to 2912 RPM 0.31 to 0.97 g/rev "TRIANGLE" < 308 RPM "TRIANGLE" < 0.27 g/rev "TRIANGLE" < 4.1% "TRIANGLE" < 504°Throttle Position Sensor (TPS)/s 399 < T °C < 899 Integrated Air Mass > 200g |
90 s / once per driving cycle | two driving cycles |
If the above table does not include details of the following enabling conditions: - IAT, ECT, vehicle speed range, and time after engine start-up then the state of these parameters has no influence upon the execution of the monitor.