Diagnostic Method

After establishing the execution conditions, calculate the front oxygen (A/F) sensor lambda deviation cumulative value (Σ |(sglmd_n - sglmd_n-1 )|) and rear oxygen sensor output voltage deviation cumulative value (Σ |(ro2sad_n - ro2sad_n-1 )|) Per 32 milliseconds x 4, and when the front oxygen (A/F) sensor lambda deviation cumulative value (Σ |(sglmd_n - sglmd_n-1 )|) becomes the predetermined value or more, calculate the diagnostic value.

• Abnormality Judgement 

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

Judgement Value 

Time Needed for Diagnosis:  30 - 55 seconds

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

• Normality Judgement 

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

Judgement Value 

Time Needed for Diagnosis:  30 - 55 seconds