Subaru LEGACY 2006 Manual page 557

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BF:DTC P0442 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECT-
ED (SMALL LEAK)
1. OUTLINE OF DIAGNOSIS
Check if there is a leakage in fuel system or not, and perform the function diagnosis of valve.
(1)
(13)
(1) Fuel gauge
(2) Intake manifold
(3) Throttle body
(4) Purge control solenoid valve
(5) Engine control module (ECM)
(6) Canister
In this system diagnosis, check for leakage and valve function is conducted by changing the fuel tank pres-
sure and monitoring the pressure change using the fuel tank pressure sensor. When in 0.04 inch diagnosis,
perform in the order of mode Z → mode A → mode B → mode C and mode D; When in 0.02 inch diagnosis, per-
form in the order of mode A → mode B → mode C → mode D and mode E.
(3)
(2)
(15)
(14)
(16)
(10)
(12)
(11)
(7) Pressure control valve
(8) Drain valve
(9) Drain filter
(10) Shut-off valve
(11) Fuel temperature sensor
GD(H4SO)-120
(4)
(5)
(7)
(9)
(8)
(6)
(12) Fuel level sensor
(13) Fuel tank
(14) Fuel cut valve
(15) Fuel tank pressure sensor
(16) Vent valve
EN-04151