Diagnostic Method 2

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

Fig 1: Front Oxygen (A/F) Sensor Output (Diagnostic Method 2)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

Judgment Value

JUDGMENT VALUE SPECIFICATION

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

CUMULATIVE VALUE SPECIFICATION - MAP

Cumulative value obtained from the amount of variation in λ Σ lambda(n) - lambda(n-1)	0.00	3.00
Cumulative value obtained from the amount of variation in λ change	0.00	2.50

Time Needed for Diagnosis: 120 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.