Subaru 2009 IMPREZA Service Manual page 635

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
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:
Drain valve can be operated using the Subaru
Select Monitor. For the procedures, refer to
"Compulsory Valve Operation Check Mode".
<Ref. to EN(H4SO)(diag)-56, 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(H4SO)(diag)-
56, Compulsory
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(H4SO)(diag)-56, Compulsory Valve Opera-
tion 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.
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?
Valve Operation Check
Does the pressure control sole-
noid valve operate?
Is there any hole of more than
0.5 mm (0.020 in) dia. on evap-
oration line?
EN(H4SO)(diag)-218
Check Yes
Go to step 2.
Go to step 3.
Repair or replace
the fuel filler cap
and fuel filler pipe.
<Ref. to
FU(H4SO)-61,
Fuel Filler Pipe.>
Go to step 6.
Go to step 7.
Repair or replace
the evaporation
line. <Ref. to
FU(H4SO)-76,
Fuel Delivery and
Evaporation
Lines.>
No
Tighten fuel filler
cap securely.
Replace with a
genuine fuel filler
cap.
Go to step 4.
Replace the drain
valve. <Ref. to
EC(H4SO)-19,
Drain Valve.>
Replace the purge
control solenoid
valve. <Ref. to
EC(H4SO)-9,
Purge Control
Solenoid Valve.>
Replace the pres-
sure control sole-
noid valve. <Ref. to
EC(H4SO)-16,
Pressure Control
Solenoid Valve.>
Go to step 8.