Diagnostic Method
Calculate faf difference every 32 ms x 4, and the A, value difference. Calculate the diagnosis value after calculating 820 time(s).
- Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
JUDGMENT VALUE REFERENCE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| parafca = td2faf/td2lmd where, td2faf (N) = td2faf (n-1) + |d2faf (n)| td2lmd (N) = td2lmd (n-1) + |d2lmd (n)| add up to 32 ms x 4 x 820 time(s). d2faf (n) = (faf (n) - faf (n-1)) - (faf (n-1) - faf (n-2)) d2lmd (n) = (Imd (n) - Imd (n-1)) - (Imd (n-1) - Imd (n-2)) faf = main feedback compensation coefficient every 128 milliseconds Imd = output lambda every 128 milliseconds |
> 0.4 |
Time Needed for Diagnosis: 32 ms x 4 x 820 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
JUDGMENT VALUE REFERENCE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| parafca = td2faf/td2lmd where, td2faf (N) = td2faf (n-1) + |d2faf (n)| td2lmd (N) = td2lmd (n-1) + |d2lmd (n)| add up to 32 ms x 4 x 820 time(s). d2faf (n) = (faf (n) - faf (n-1)) - (faf (n-1) - faf (n-2)) d2lmd (n) = (Imd (n) - Imd (n-1)) - (Imd (n-1) - Imd (n-2)) faf = main feedback compensation coefficient every 128 milliseconds Imd = output lambda every 128 milliseconds |
≤ 0.4 |
Time Needed for Diagnosis: 32 ms x 4 x 820 time(s)