Diagnosis 1
Detect the malfunction depending on the average value of time necessary for λ 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 and |
More than 550 ms |
| Average value when λ is lean | More than 600 ms |
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 and |
More than 550 ms |
| Average value when λ is rich | More than 750 ms |
Time needed for diagnosis: 120 s
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.