Diagnostic Method

Detect a malfunction by measuring the time from the beginning of the fuel cut until the rear oxygen sensor voltage starts to drop.

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATIONS

Malfunction Criteria	Threshold Value
Time needed for the rear oxygen sensor voltage to change up to 0.5 V after the fuel cut started	More than 3600 ms

Time needed for diagnosis: Less than 1 s

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