Diagnostic Method 1
Detect the malfunction depending on the average value of time necessary for A to inverse the air fuel ratio from "Lean → Rich → Lean" to "Rich → Lean → Rich".
Judge as NG when the following conditions are established.
JUDGMENT VALUE SPECIFICATION (P015A)
| Malfunction Criteria | Threshold Value |
|---|---|
| Average value of time necessary for λ to inverse the air fuel ratio to Lean → Rich → Lean Average value when λ is lean |
More than 110ms More than 140ms |
JUDGMENT VALUE SPECIFICATION (P015B)
| Malfunction Criteria | Threshold Value |
|---|---|
| Average value of time necessary for λ to inverse the air fuel ratio to Rich → Lean → Rich Average value when λ is rich |
More than 390ms More than 400ms |
Time needed for diagnosis: 90 s
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.