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
Elapsed time⁽¹⁾

Less than 0.2 V
More than value of Map

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

INTAKE AIR AMOUNT - MAP

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.