Diagnostic Method
After the enable conditions have been established, calculate the front oxygen (A/F) sensor lambda deviation sum value and the rear oxygen sensor output voltage deviation sum value in every 32 ms x 4 times. If the front oxygen (A/F) sensor lambda deviation sum value is the predetermined value or more, calculate the diagnostic value.
If the duration of time while the following conditions are met is within the time indicated, judge as NG. Except for PZEV model
| Malfunction Criteria | Threshold Value |
|---|---|
| Rear oxygen sensor output voltage deviation sum value - front oxygen (A/F) sensor lambda deviation sum value | > 8 |
PZEV model
| Malfunction Criteria | Threshold Value |
|---|---|
| Catalyst monitoring value - Rear oxygen sensor response compensation coefficient | > 0.35 g |
Map
| Estimated catalyst temperature °C (°F) | 450 (842) | 500 (932) | 600 (1, 112) | 650 (1, 202) | 700 (1, 292) | 800 (1, 472) | 900 (1, 652) | 1000 (1, 832) |
| Temperature factor | 1.15 | 1.1 | 1 | 1.15 | 1.2 | 1.2 | 1.2 | 1.2 |
* After 5 to 15 seconds of fuel cut recovery, the catalyst monitoring value will be calculated until the rear oxygen sensor exceeds 0.2 V.
Time needed for diagnosis:
Except for PZEV model: Less than 30 to 55 seconds
PZEV model: Less than 1 second
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.