Diagnostic Method
After the enable conditions have been established, calculate the front oxygen (A/F) sensor lambda value deviation cumulative value (Σ |(sglmd<n - sglmd<n-1 )|), and rear oxygen sensor output voltage deviation cumulative value (Σ |(ro2sad<n - ro2sad<n-1 )|) in every 32 x 4 times. If the front oxygen (A/F) sensor lambda value deviation cumulative value (Σ |(sglmd<n - sglmd<n-1 )|) is the predetermined value or more, calculate the judgment value.
- Abnormality Judgment
If the duration of time while the following conditions are met is within the time indicated, judge as NG.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Σ |(ro2sad<n - ro2sad<n-1 )|/Σ |(sglmd<n - sglmd<n-1 )| | > 9.03 |
Time Needed for Diagnosis: 30 - 55 seconds
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 within the predetermined time.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Σ |(ro2sad<n - ro2sad<n-1 )|/Σ |(sglmd<n - sglmd<n-1 )l | ≤ 9.03 |
Time Needed for Diagnosis: 30 - 55 seconds