Diagnostic Method

Measure the pressure values when the enable conditions are established, and perform diagnosis by calculating those results.

1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are established, and set the EGR target step to 50 steps (nearly full open).
2. Name the intake manifold pressure value as PMON one second after the target EGR step is set to 50 (when the enabled conditions were established). Then set the target EGR step to 0.
3. Name the intake manifold pressure value as PMOF2 one second after the target EGR step is set to 0 (two seconds after the enabled conditions were established).

• Abnormality Judgment 

Judge as NG when the following conditions are established.

Time Needed for Diagnosis:  1 time

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

Fig 1: Malfunction Indicator Light Illumination Pattern

Courtesy of SUBARU OF AMERICA, INC.

• Normality Judgment 

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis:  1 time