Page 2001 of 2890
OBD0329
AF: DTC P0420
—CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD (CAT)—
DTC DETECTING CONDITION:
Immediately at fault recognition (2200 cc all states
except California model only)
Two consecutive trips with fault
TROUBLE SYMPTOM:
Engine stalls.
Idle mixture is out of specifications.
10AF1Check any other DTC P0130, P0133, P0135,
P0136, P0139 and P0141 on display.
10AF2Check exhaust system.
10AF3Check rear catalytic converter.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0762
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10. Diagnostics Chart with Trouble Code
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WIRING DIAGRAM:
RHD Model
B2M0794
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10. Diagnostics Chart with Trouble Code
Page 2003 of 2890

10AF1CHECK ANY OTHER DTC P0130, P0133,
P0135, P0136, P0139 AND P0141 ON DIS-
PLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0130,
P0133, P0135, P0136, P0139 and P0141?
: Inspect the relevant DTC using“10. Diagnostics
Chart with Trouble Code 2-7 [T1000]”.
NOTE:
In this case, it is not necessary to inspect DTC P0420.
: Go to step10AF2.
10AF2
CHECK EXHAUST SYSTEM.
Check for gas leaks or air suction caused by loose or dis-
located nuts and bolts, and open hole at exhaust pipes.
: Is there a fault in exhaust system?
NOTE:
Check the following positions.
Between cylinder head and front exhaust pipe
Between front exhaust pipe and front catalytic converter
Between front catalytic converter and rear catalytic con-
verter
: Repair or replace exhaust system.
: Go to step10AF3.
OBD0525B
10AF3
CHECK REAR CATALYTIC CONVERTER.
1) Separate rear catalytic converter from rear exhaust
pipe.
: Is there damage at rear face of rear cata-
lyst?
: Replace front and rear catalytic converters.
: Go to next step 2).
OBD0524B
2) Remove front catalytic converter.
: Is there damage at rear face or front face of
front catalyst?
: Replace front catalytic converter.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
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10. Diagnostics Chart with Trouble Code
Page 2004 of 2890
H2M1365
AG: DTC P0440
—EVAPORATIVE EMISSION CONTROL
SYSTEM MALFUNCTION (EVAP)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
TROUBLE SYMPTOM:
Gasoline smell
10AG1Check any other DTC (besides DTC P0440) on
display.
10AG2Check fuel filler cap and fuel filler pipe.
10AG3Check vent control solenoid valve.
10AG4Check purge control solenoid valve.
10AG5Check pressure control solenoid valve.
10AG6Check evaporative emission control system
line.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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10. Diagnostics Chart with Trouble Code
Page 2005 of 2890
WIRING DIAGRAM:
LHD Model
B2M0919
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10. Diagnostics Chart with Trouble Code
Page 2006 of 2890
WIRING DIAGRAM:
RHD Model
B2M1017
10AG1CHECK ANY OTHER DTC (BESIDES DTC
P0440) ON DISPLAY.
: Is there any other DTC on display?
: Inspect the relevant DTC using“10. Diagnostics
Chart with Trouble Code, 2-7 [T1000]”.
: Go to step10AG2.
10AG2CHECK FUEL FILLER CAP AND FUEL
FILLER PIPE.
1) Turn ignition switch to OFF.
2) Open the fuel flap.
: Is the fuel filler cap tightened securely?
: Tighten fuel filler cap securely.
: Go to next.
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10. Diagnostics Chart with Trouble Code
Page 2007 of 2890

: Is there any damage to the seal between
fuel filler cap and fuel filler pipe?
: Repair or replace fuel filler cap and fuel filler pipe.
: Go to step10AG3.
OBD0005B
10AG3CHECK VENT CONTROL SOLENOID
VA LV E .
1) Connect test mode connector.
2) Turn ignition switch to ON.
B2M0925A
: Does vent control solenoid valve produce
operating sound?
NOTE:
Vent control solenoid valve operation check can also be
executed using Subaru Select Monitor (Function mode:
FD08). For the procedure, refer to“COMPULSORY VALVE
OPERATION CHECK MODE”2-7 [T3F0].
: Go to step10AG4.
: Replace vent control solenoid valve.
OBD0025B
10AG4CHECK PURGE CONTROL SOLENOID
VA LV E .
: Does purge control solenoid valve produce
operating sound?
NOTE:
Purge control solenoid valve operation check can also be
executed using Subaru Select Monitor (Function mode:
FD02). For the procedure, refer to“COMPULSORY VALVE
OPERATION CHECK MODE”2-7 [T3F0].
: Go to step10AG5.
: Replace purge control solenoid valve.
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Page 2008 of 2890

B2M0923B
10AG5CHECK PRESSURE CONTROL SOLE-
NOID VALVE.
: Does pressure control solenoid valve pro-
duce operating sound?
NOTE:
Pressure control solenoid valve operation check can also
be executed using Subaru Select Monitor (Function mode:
FD07). For the procedure, refer to“COMPULSORY VALVE
OPERATION CHECK MODE”2-7 [T3F0].
: Go to step10AG6.
: Replace pressure control solenoid valve.
10AG6CHECK EVAPORATIVE EMISSION CON-
TROL SYSTEM LINE.
Turn ignition switch to OFF.
: Does fuel leak in fuel line?
: Repair or replace fuel line.
: Go to next.
: Is there any damage at canister?
: Repair or replace canister.
: Go to next.
: Is there any damage at fuel tank?
: Repair or replace fuel tank.
: Go to next.
: Are there holes, cracks, clogging or discon-
nections of hoses or pipes in evaporative
emission control system?
: Repair or replace hoses or pipes.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
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10. Diagnostics Chart with Trouble Code