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: Sensor Output And Accumulated Time Graph

Courtesy of SUBARU OF AMERICA, INC.

Abnormality Judgment

Judge as NG when the following conditions are established.

JUDGMENT VALUE

Malfunction Criteria	Threshold Value	DTC
(Cumulative value of time when λ changes from lean → rich)/(Time during which diagnosis is in progress)	< 0.35 (AT model) < 0.39 (MT model)	P014C
	> 0.65 (AT model) > 0.59 (MT model)	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

Malfunction Criteria	Threshold Value	DTC
(Cumulative value of time when λ changes from lean → rich)/(Time during which diagnosis is in progress)	≥ 0.35 (AT model) ≥ 0.39 (MT model)	P014C
	≤ 0.65 (AT model) ≤ 0.59 (MT model)	P014D

Time Needed for Diagnosis: 90 seconds