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Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P04DB: Crankcase Ventilation System (PCV) Disconnected >> General Description >> Diagnostic Method

Diagnostic Method

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Positive crankcase ventilation diagnosis voltage 3.59 V or more

Time needed for diagnosis:  2500 ms

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.