Diagnostic Method

After establishing the execution conditions, calculate the front oxygen (A/F) sensor lambda deviation cumulative value per 32 milliseconds x 4 (Σ |(sglmd_n - sglmd_n-1 )|) and rear oxygen sensor output voltage deviation cumulative value (Σ |(ro2sad_n - ro2sad_n-1 )|), 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 Judgment

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

JUDGMENT VALUE CHART

Malfunction Criteria	Threshold Value
Σ \|(ro2sad_n - ro2sad_n-1 )\| / Σ \|(sglmd_n - sglmd_n-1 )\|	> 18 (Bin5 model) > 16 (ULEV model)

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 CHART

Malfunction Criteria	Threshold Value
Σ \|(ro2sad_n - ro2sad_n-1 )\| / Σ \|(sglmd_n - sglmd_n-1 )\|	≤ 18 (Bin5 model) ≤ 16 (ULEV model)

Time Needed for Diagnosis: 30 - 55 seconds