Diagnostic Method
Calculate fan difference every 128 milliseconds, and the λ value difference. Calculate the diagnosis value after calculating 1,640 times (210 seconds).
Judge as NG when the malfunction criteria below are met. Judge as OK and clear the NG when the malfunction criteria below are not met.
Judgment Value
MALFUNCTION CRITERIA AND THRESHOLD VALUE REFERENCE
| Malfunction Criteria | Threshold Value |
|---|---|
| parafca = td2faf/td2lmd where, td2faf (N) = td2faf (n-1) + |d2faf (n)| td2lmd (N) = td2lmd (n-1) + |d2lmd (n)| add up for a total of 300 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 |
≥ 0.25 |
Time Needed for Diagnosis: 210 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.