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 520ms More than 550ms |
Time needed for diagnosis : 90 s
Malfunction indicator light illumination : Illuminates when malfunction occurs in 2 continuous driving cycles.