Diagnostic Method

Detect the trouble by calculating the time from the completion of the fuel cut to the beginning of the rear oxygen sensor voltage starting to rise.

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria

Threshold Value

Rear oxygen sensor output voltage

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

Map

AMOUNT OF INTAKE AIR

Amount of intake air (g/s (oz/s))	30 (1.1)	32 (1.1)	40 (1.4)	45 (1.6)
Elapsed time (ms)	4000	3500	3500	3500

Time needed for diagnosis: Less than 1 s

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