Subaru LEGACY 2006 Manual page 584

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Diagnostic Trouble Code (DTC) Detecting Criteria
BO:DTC P0459 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE
CIRCUIT HIGH
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the purge control solenoid valve.
Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
(A) To canister
3. ENABLE CONDITION
Secondary Parameters
Ignition switch
Battery voltage
After engine starting
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
(A)
(B) To intake manifold
Enable Conditions
ON
≥ 10.9 V
1 second or more
GD(H4SO)-147
GENERAL DESCRIPTION
(B)
EN-01733