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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P1491 Positive Crankcase Ventilation (Blow-By) Function Problem >> Diagnostic Method

Diagnostic Method

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

Judge as OK and clear the NG when the malfunction criteria below 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