Subaru LEGACY 2006 Manual page 636

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Diagnostic Trouble Code (DTC) Detecting Criteria
CS:DTC P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION
PROBLEM
1. OUTLINE OF DIAGNOSIS
Detect the blow-by hose release abnormality.
Judge as NG when the diagnosis terminal voltage is high.
2. COMPONENT DESCRIPTION
(1)
(1) Engine control module (ECM)
(2) Detecting circuit
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(4)
(2)
(3) PCV diagnosis connector
Enable Conditions
GD(H4SO)-199
GENERAL DESCRIPTION
(3)
(4) 5 V
E
EN-01790