Subaru 2009 IMPREZA Service Manual page 1440

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 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 has caught while
tightening.
2 CHECK FUEL FILLER CAP.
3 CHECK FUEL FILLER PIPE GASKET.
4 CHECK DRAIN VALVE.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Operate the drain valve using the Subaru
Select Monitor.
NOTE:
The drain valve can be operated using Subaru
Select Monitor. For the procedures, refer to
"Compulsory Valve Operation Check Mode".
<Ref. to EN(H4DOTC)(diag)-55, Compulsory
Valve Operation Check Mode.>
5 CHECK PURGE CONTROL SOLENOID
VALVE.
Operate the purge control solenoid valve using
the Subaru Select Monitor.
NOTE:
Purge control solenoid valve operation can be
executed using Subaru Select Monitor. For the
procedures, refer to "Compulsory Valve Opera-
tion Check Mode". <Ref. to EN(H4DOTC)(di-
ag)-55, Compulsory Valve Operation Check
Mode.>
6 CHECK PRESSURE CONTROL SOLENOID
VALVE.
Operate the pressure control solenoid valve
using the Subaru Select Monitor.
NOTE:
The pressure control solenoid valve operation
can be executed using the Subaru Select Mon-
itor. For the procedures, refer to "Compulsory
Valve Operation Check Mode". <Ref. to
EN(H4DOTC)(diag)-55, Compulsory Valve Op-
eration Check Mode.>
7 CHECK EVAPORATIVE EMISSION CON-
TROL SYSTEM LINE.
1) Turn the ignition switch to OFF.
2) Disconnect the delivery (test) mode connec-
tor.
Check
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 5.
Does the purge control sole-
noid valve operate?
Does the pressure control sole-
noid valve operate?
Is there any hole of more than
1.0 mm (0.04 in) dia. on evapo-
ration line?
EN(H4DOTC)(diag)-219
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Tighten fuel filler
cap securely.
Go to step 3. Replace with a
genuine fuel filler
cap.
Repair or replace Go to step 4.
the fuel filler cap
and fuel filler pipe.
<Ref. to
FU(H4DOTC)-69,
Fuel Filler Pipe.>
Replace the drain
valve. <Ref. to
EC(H4DOTC)-22,
Drain Valve.>
Go to step 6. Replace the purge
control solenoid
valve. <Ref. to
EC(H4DOTC)-11,
Purge Control
Solenoid Valve.>
Go to step 7. Replace the pres-
sure control sole-
noid valve. <Ref. to
EC(H4DOTC)-19,
Pressure Control
Solenoid Valve.>
Repair or replace Go to step 8.
the evaporation
line. <Ref. to
FU(H4DOTC)-84,
Fuel Delivery,
Return and Evapo-
ration Lines.>