Catalyst Monitor
OPERATION
| DTCs | P0420 |
| Monitor execution | Once per driving cycle |
| Monitoring duration | Min. 20 sec. (with A/F signal difference accumulation >= 1.0) |
ENABLE CONDITIONS
| Parameter | Min. | Max. |
|---|---|---|
| ECT | 70 °C (158 °F) | - |
| MAF | 10 g/sec. | 50 g/sec. |
| MAF change | - | 2 g/sec. |
| HO2S feedback | Closed loop | |
| Warm-up counter (count up when not fuel shut off) | 9000 | - |
| A/F sensor | No DTC (P0131, P0132, P2195, P2196, P2237) | |
| HO2S | No DTC (P0137, P0138) | |
TYPICAL MALFUNCTION THRESHOLDS
| Index (HO2S signal difference / A/F sensor signal difference) of catalyst deterioration between A/F sensor and HO2S >= 20 |