Diagnostic Method 2

Detect the malfunction by the cumulative value obtained from the amount of variation in λ change.

Fig 1: Sensor Output Illustration

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 obtained from the amount of variation in λ change Σ |(lambda(n) - lambda(n-1)) - (lambda(n-1) - lambda(n-2))	< Value from Map	P014C and P014D

  MAP CHART
  
  

  Cumulative value obtained from the amount of variation in λ Σ lambda(n) - lambda(n-1)	0	2.5
  Cumulative value obtained from the amount of variation in λ change	0.3	1.2

  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 obtained from the amount of variation in λ change Σ(lambda(n) - lambda(n-1)) - (lambda(n-1) - lambda(n-2))	≥ Value from Map	P014C and P014D

  Time Needed for Diagnosis:  90 seconds