P015A

DTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1)

1. OUTLINE OF DIAGNOSIS
Detect the slow response of front oxygen (A/F) sensor.
For diagnosis, detect the trouble by processing the Lambda waveform in normal driving without forcibly changing the target air fuel ratio.

2. COMPONENT DESCRIPTION






3. ENABLE CONDITION






4. GENERAL DRIVING CYCLE
Perform diagnosis only once in a city driving including normal acceleration and deceleration.

5. DIAGNOSTIC METHOD 1
Detect the malfunction depending on the average value of time necessary for Lambda to inverse the air fuel ratio from "Lean --> Rich --> Lean" to "Rich --> Lean --> Rich".






Abnormality Judgment
Judge as NG when the following conditions are established.






Time Needed for Diagnosis: 50 times of inversion
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis: 50 times of inversion

6. DIAGNOSTIC METHOD 2
Detect the malfunction by calculating the average amplitude of Lambda.






Abnormality Judgment
Judge as NG when the following conditions are established.






Time Needed for Diagnosis: 60 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis: 60 seconds