Diagnostic Method 3
Change STFT (A/F compensation value) by interruption, and measure the reaction time of λ value. When A/F sensor malfunctions, the reaction time takes longer than at normal condition. In this case, judge as abnormal.
Measure reaction time (t1, t2, t3) and reaction time (t4, t5, t6). Use the average value of the reaction time to obtain the diagnostic value.
Judge as NG when the following conditions are established.
JUDGMENT VALUE SPECIFICATION (EXCEPT FOR TYPE RA)
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| (t1 + t2 + t3)/3 | > 380ms | P015A and P015B |
| and | ||
| (t4 + t5 + t6)/3 | > 380ms |
JUDGMENT VALUE SPECIFICATION (TYPE RA)
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| (t1 + t2 + t3)/3 | > 480ms | P015A and P015B |
| and | ||
| (t4 + t5 + t6)/3 | > 480ms |
Time needed for diagnosis: 4500 ms
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.