Subaru LEGACY 2006 Manual page 257

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK FUEL FILLER CAP.
1) Turn the ignition switch to OFF.
2) Check the fuel filler cap.
NOTE:
The DTC is stored in memory if fuel filler cap is
or was loose or if the cap chain was caught
while tightening.
3 CHECK FUEL FILLER CAP.
4 CHECK FUEL FILLER PIPE PACKING.
5 CHECK DRAIN VALVE.
1) Connect the test mode connector.
2) Turn the ignition switch to ON.
3) Check the drain valve.
NOTE:
Drain valve operation can be executed using
Subaru Select Monitor. For procedure, refer to
"Compulsory Valve Operation Check Mode".
<Ref. to EN(H4SO)(diag)-44, Compulsory
Valve Operation Check Mode.>
6 CHECK PURGE CONTROL SOLENOID
VALVE.
Operate the purge control solenoid valve.
NOTE:
Purge control solenoid valve operation can be
executed using Subaru Select Monitor. For pro-
cedure, refer to "Compulsory Valve Operation
Check Mode". <Ref. to EN(H4SO)(diag)-44,
Compulsory Valve Operation Check Mode.>
7 CHECK PRESSURE CONTROL SOLENOID
VALVE.
Operate the pressure control solenoid valve.
NOTE:
The pressure control solenoid valve operation
can be executed using the Subaru Select Mon-
itor. For procedure, refer to "Compulsory Valve
Operation Check Mode".
<Ref. to EN(H4SO)(diag)-44, Compulsory
Valve Operation Check Mode.>
8 CHECK CANISTER.
Check
Is any other DTC displayed?
Is the fuel filler cap tightened
securely?
Is the fuel filler cap genuine?
Is there any damage to the
seal between fuel filler cap and
fuel filler pipe?
Does the drain valve operate? Go to step 6.
Does the purge control sole-
noid valve operate?
Does the pressure control
solenoid valve operate?
Is the canister damaged?
EN(H4SO)(diag)-220
Yes No
Check the appro- Go to step 2.
priate DTC using
the "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H4SO)(diag)-
70, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 3. Securely install the
fuel filler cap.
Go to step 4. Replace with a
genuine fuel filler
cap.
Repair or replace Go to step 5.
the fuel filler cap
and fuel filler pipe.
<Ref. to
FU(H4SO)-47,
Fuel Filler Pipe.>
Replace the drain
valve. <Ref. to
EC(H4SO)-15,
Drain Valve.>
Go to step 7. Replace the purge
control solenoid
valve. <Ref. to
EC(H4SO)-6,
Purge Control
Solenoid Valve.>
Go to step 8.
Replace the pres-
sure control sole-
noid valve. <Ref.
to EC(H4SO)-6,
Purge Control
Solenoid Valve.>
Go to step 9.
Repair or replace
the canister. <Ref.
to EC(H4SO)-5,
Canister.>