Diagnostic Method 2

Detect the malfunction by calculating the average amplitude of λ.

Fig 1: Locating Amplitude Of Front Oxygen (A/F) Sensor Graph (Sensor Output - Time)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

Time needed for diagnosis:  1000 ms x 4.5 ms

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