Diagnostic Method 1
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Detect the malfunction by checking "Cumulative value of time when λ changes from lean → rich" in comparison to "Time during which diagnosis is in progress".
Judge as NG when the following conditions are established.
JUDGMENT VALUE SPECIFICATIONS (P014C)
| Malfunction Criteria | Threshold Value |
|---|---|
| (Cumulative value of time when λ changes from lean → rich)/(Time during which diagnosis is in progress) | Less than 0.35 |
| Average value of time necessary for λ to inverse the air fuel ratio to Lean → Rich → Lean | More than 8 ms |
JUDGMENT VALUE SPECIFICATIONS (P014D)
| Malfunction Criteria | Threshold Value |
|---|---|
| (Cumulative value of time when λ changes from lean → rich)/(Time during which diagnosis is in progress) | More than 0.7 |
| Average value of time necessary for λ to inverse the air fuel ratio to Rich → Lean → Rich | More than 30 ms |
Time needed for diagnosis: 90 s
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.