Diagnostic Method
Calculate faf difference every 32 ms x 4, and the λ value difference. 820 time(s) Calculate the diagnosis value after calculating.
- Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgment Value
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 |
> 0.22 |
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
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 |
≤ 0.22 |
Time Needed for Diagnosis: 32 ms x 4 x 820 time(s)