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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P1491 Positive Crankcase Ventilation (Blow-By) Function Problem >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Abnormality Judgment 

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than 2.5 seconds.

Judgment Value 

JUDGMENT VALUE CHART

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 

If the following conditions are established after predetermined amount of time has passed, judged as OK. Judge as OK and clear the NG when the following criteria are met.

Judgment Value 

JUDGMENT VALUE CHART

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