Diagnostic Method
Calculate fan difference every 128 milliseconds, and the lambda value difference. Calculate the diagnostic value after calculating for 210 seconds.
Judge as NG when the malfunction criteria below are completed. Judge as OK and clear the NG when the malfunction criteria below are not met.
Judgment Value
JUDGMENT VALUE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| parafca = td2faf/td2lmd | ≥ 0.44 |
| where, | |
| td2faf (N) = td2faf (n-1) + |d2faf (n)| | |
| td2lmd (N) = td2lmd (n-1) + |d2lmd (n)| | |
| add up to a total of 210 seconds | |
| d2faf (n) = (fan (n) - fan (n-1)) - (fan (n-1) -fan (n-2)) | |
| d2lmd (n) = (lmd (n) - lmd (n-1)) - (lmd (n-1)-lmd(n-2)) | |
| fan = main feedback compensation coefficient every 128 milliseconds | |
| lmd = output lambda every 128 milliseconds |
Time Needed for Diagnosis: 210 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.