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Home >> Subaru >> 2006 >> Forester X, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO) >> DTC P0607 Control Module Performance >> DTC P1491 Positive Crankcase Ventilation (Blow-By) Function Problem >> Diagnostic Method
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Diagnostic Method

Abnormality Judgment 

Judge as NG when the continuous time with the following criteria established exceeds 2.5 seconds.

Judgment Value 

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Battery voltage > 10.9 V
Engine speed ≥ 500 rpm
Positive crankcase ventilation diagnosis voltage High

Time Needed for Diagnosis:  2.5 seconds

Malfunction Indicator Light Illumination:  Illuminates as soon as a malfunction occurs.

Normality Judgment 

Judge as OK when the following conditions are established after predetermined amount of time has passed.

Judge as OK and clear the NG when the following criteria are met.

Judgment Value 

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Battery voltage > 10.9 V
Engine speed ≥ 500 rpm
Positive crankcase ventilation diagnosis voltage Low