Diagnostic Method
After establishing the execution conditions, calculate the front oxygen (A/F) sensor lambda deviation cumulative value per 128 milliseconds (Σ |(sglmdn - sglmdn-i )|) and rear oxygen sensor output voltage deviation cumulative value (Σ |(ro2sadn - ro2sadn-i )|), and when the front oxygen (A/F) sensor lambda deviation cumulative value (Σ |(sglmdn - sglmdn-i )|) becomes higher than the predetermined value, calculate the diagnostic value.
Judge as NG when the malfunction criteria below are met. Judge as OK if the criteria below are not met.
Judgment Value
JUDGMENT VALUE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| Σ |(ro2sadn - ro2sadn-1 )| / Σ |(sglmdn - sglmdn-i )| | > 1.0 |
Time Needed for Diagnosis: 30 - 55 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.