Diagnostic Method 1

Detect the malfunction by checking "Cumulative value of time when λ changes from lean → rich" in comparison to "Time during which diagnosis is in progress".

Fig 1: Lean To Rich Time Chart

Courtesy of SUBARU OF AMERICA, INC.

• Abnormality Judgment 

  Judge as NG when the following conditions are established.

  JUDGMENT VALUE CHART
  
  

  Malfunction Criteria	Threshold Value	DTC
  (Cumulative value of time when λ changes from lean → rich) / (Time during which diagnosis is in progress)	< 0.39	P014C
  	> 0.63	P014D

  Time Needed for Diagnosis:  90 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.

  JUDGMENT VALUE CHART
  
  

  Malfunction Criteria	Threshold Value	DTC
  (Cumulative value of time when λ changes from lean → rich) / (Time during which diagnosis is in progress)	≥ 0.39	P014C
  	≥ 0.63	P014D

  Time Needed for Diagnosis:  90 seconds