Diagnostic Method

Detect a malfunction by measuring the time from fuel cut completed until the rear oxygen sensor voltage begins to rise.

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria

Threshold Value

Output voltage value of rear oxygen sensor

Less than 0.2 V

Elapsed time⁽¹⁾

More than value of Map

⁽¹⁾	The time since the λ became less than 1 after the end of fuel cut

AVERAGE VALUE OF INTAKE AIR AMOUNT - Map

Average value of intake air amount (g/s (oz/s))	29 (1)	30 (1.1)	32 (1.1)	40 (1.4)	45 (1.6)
Elapsed time (ms)	3330	3300	3300	3300	3300

Time needed for diagnosis: Less than 1 s

Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.