1996 SUBARU LEGACY Ecu

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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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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.






236
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

: 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.
239
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0331
AH: DTC P0441
—EVAPORATIVE EMISSION CONTROL
SYSTEM INCORRECT PURGE FLOW
(CPC
—F)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10AH1Check any other DTC P0105, P0106, P0443
and P1102 on display.
10AH2Check purge control solenoid valve operation.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:

LHD Model
B2M0569

241
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0005B
10AH2CHECK PURGE CONTROL SOLENOID
VALVE OPERATION.
1) Turn ignition switch to OFF.
2) Connect test mode connector at the lower portion of
instrument panel (on the driver’s side), to the side of the
center console box.
3) Turn ignition switch to ON.
: Does purge control solenoid valve produce
operating sound at about 0.3 Hz?
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 next step 4).
: Replace purge control solenoid valve.
4) Disconnect canister purge hose from canister.
: Does pulsation occur by blowing through
the canister purge hose?
: Repair or replace evaporation line.
NOTE:
In this case, repair the following:

Loose connections in evaporation line

Cracks in evaporation line

Clogging in evaporation line
: Replace purge control solenoid valve.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0335
AI: DTC P0443
—EVAPORATIVE EMISSION CONTROL
SYSTEM PURGE CONTROL VALVE CIRCUIT
MALFUNCTION (CPC)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling
10AI1Check output signal from ECM.

10AI2Check harness between purge control
solenoid valve and ECM connector.
10AI3Check harness between purge control
solenoid valve and ECM connector.
10AI4Check purge control solenoid valve.
10AI5Check power supply to purge control solenoid
valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.




244
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code