Diagnostic Method

Calculate faf difference every 32ms x 4, and the λ value difference. Calculate the diagnosis value after calculating 1640 time(s).

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgement Value

JUDGEMENT VALUE REFERENCE

Malfunction Criteria	Threshold Value
parafca = td2faf/td2lmd	> 0.4 (U5 model) > 0.45 (Other than U5 model)
where, td2faf (N) = td2faf (n-1) + \|d2faf (n)\| td2lmd (N) = td2lmd (n-1) + \|d2lmd (n)\| add up to 32 ms x 4 x 1640 time(s). d2faf (n) = (faf (n) - faf (n-1)) - (faf (n-1) -faf(n-2)) d2lmd (n) = (lmd (n) - lmd (n-1)) - (lmd (n-1) - lmd (n-2)) faf = main feedback compensation coefficient every 128 milliseconds lmd = output lambda every 128 milliseconds

Time Needed for Diagnosis: 32 ms x 4 x 1640 time(s)

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgement Value

JUDGEMENT VALUE REFERENCE

Malfunction Criteria	Threshold Value
parafca = td2faf/td2lmd	≤ 0.4 (U5 model) ≤ 0.45 (Other than U5 model)
where, td2faf (N) = td2faf (n-1) + \|d2faf (n)\| td2lmd (N) = td2lmd (n-1) + \|d2lmd (n)\| add up to 32 ms x 4 x 1640 time(s). d2faf (n) = (faf (n) - faf (n-1)) - (faf (n-1) - faf (n-2)) d2lmd (n) = (lmd (n) - lmd (n-1)) - (lmd (n-1) - lmd (n-2)) faf = main feedback compensation coefficient every 128 milliseconds lmd = output lambda every 128 milliseconds

Time Needed for Diagnosis: 32 ms x 4 x 1640 time(s)