Diagnostic Method

Integrate the difference of faf in every 128 milliseconds and difference of lambda value.

After integrate 350 seconds, calculate the diagnosis value.

Judge NG when the malfunction criteria below are completed. Judge OK and clear NG when the malfunction criteria below are not completed.

• Judgment Value 
  Fig 1: Threshold Valve Table

  Courtesy of SUBARU OF AMERICA, INC.

  Time Needed for Diagnosis:  350 seconds

  Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.