Diagnostic Method 1
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 SPECIFICATION
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| (Cumulative value of time when λ changes from lean → rich)/(Time during which diagnosis is in progress) | < 0.44 | P014C |
| and | ||
| Average value of time necessary for λ to inverse the air fuel ratio to Lean → Rich → Lean | >60 ms | |
| (Cumulative value of time when λ changes from lean → rich)/(Time during which diagnosis is in progress) | >0.61 | P014D |
| and | ||
| Average value of time necessary for λ to inverse the air fuel ratio to Rich → Lean → Rich | >20 ms |
time needed for diagnosis: 90000 ms
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.