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
THRESHOLD 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 350 ms |
| Average value when λ is lean | More than 400 ms |
THRESHOLD 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 350 ms |
| Average value when λ is rich | More than 500 ms |
Time needed for diagnosis: 120 s
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.