P014C

DTC P014C O2 SENSOR SLOW RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1)

1. OUTLINE OF DIAGNOSIS
Detect the slow response of front oxygen (A/F) sensor.
Front oxygen (A/F) sensor cover has some ventilation holes for exhaust gas. Clogged ventilation holes are diagnosed.
When the holes are clogged, the A/F output variation becomes slow comparing with the actual A/F variation because oxygen which reaches the zirconia layer is insufficient. Therefore, if the sensor cover holes are clogged, the rich to lean judgment in the ECM is delayed when the actual change from rich to lean occurs. Judge as NG when the actual movement in comparison to the ECM control amount is slow.






2. COMPONENT DESCRIPTION






3. ENABLE CONDITIONS






4. GENERAL DRIVING CYCLE
Perform diagnosis only once at a constant speed of 10 km/h - 120 km/h (6.2 MPH - 74.6 MPH) after 120 seconds or more have passed since the engine started.

5. DIAGNOSTIC METHOD
Abnormality is detected by the duration required when the lambda is inverted and then re-inverted, and detected by the amount of variation of lambda.






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






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.