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![SUBARU LEGACY 1997 Service Repair Manual 10AP1
CHECK ENGINE/TRANSMISSION TYPE.
: Is engine/transmission type 2200 cc/MT?
: Check AT/MT identification circuit. <Ref. to 2-7
[T10DD0].>
: Go to step10AP2.
B2M0566A
10AP2
CHECK OUTPUT SIGNAL FROM SUBARU LEGACY 1997 Service Repair Manual 10AP1
CHECK ENGINE/TRANSMISSION TYPE.
: Is engine/transmission type 2200 cc/MT?
: Check AT/MT identification circuit. <Ref. to 2-7
[T10DD0].>
: Go to step10AP2.
B2M0566A
10AP2
CHECK OUTPUT SIGNAL FROM](/manual-img/17/57434/w960_57434-2088.png)
10AP1
CHECK ENGINE/TRANSMISSION TYPE.
: Is engine/transmission type 2200 cc/MT?
: Check AT/MT identification circuit.
[T10DD0].>
: Go to step10AP2.
B2M0566A
10AP2
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 71 (+)—Chassis ground ( ):
Is the voltage more than 10 V?
: Go to next.
: Go to step10AP3.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time. (However, the pos-
sibility of poor contact still remains.)
NOTE:
In this case, repair the following:
Poor contact in EGR solenoid valve connector
Poor contact in ECM connector
Poor contact in coupling connector (B21)
OBD0678A
10AP3CHECK HARNESS BETWEEN EGR
SOLENOID VALVE AND ECM CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from EGR solenoid valve and
ECM.
3) Measure resistance of harness between EGR solenoid
valve connector and engine ground.
: Connector & terminal
(E18) No. 2—Engine ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and EGR solenoid valve connector.
: Go to next step 4).
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B2M0567A
4) Measure resistance of harness between ECM and EGR
solenoid valve connector.
: Connector & terminal
(B84) No. 71—(E18) No. 2:
Is the voltage less than 1Ω?
: Go to step10AP4.
: Repair harness and connector.
NOTE:
In this case, repair the following:
Open circuit in harness between EGR solenoid valve
and ECM connector
Poor contact in coupling connector (B21)
Poor contact in EGR solenoid valve connector
Poor contact in ECM connector
OBD0327
10AP4
CHECK EGR SOLENOID VALVE.
Measure resistance between EGR solenoid valve termi-
nals.
: Terminals
No. 1—No. 2:
Is the resistance between 10 and 100Ω?
: Go to step10AP5.
: Replace EGR solenoid valve.
OBD0328A
10AP5CHECK POWER SUPPLY TO EGR SOLE-
NOID VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between EGR solenoid valve and
engine ground.
: Connector & terminal
(E18) No. 1 (+)—Engine ground ( ):
Is the voltage more than 10 V?
: Go to next.
: Repair open circuit in harness between main relay
and EGR solenoid valve connector.
: Is there poor contact in EGR solenoid valve
connector?
: Repair poor contact in EGR solenoid valve con-
nector.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
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OBD0329
AQ: DTC P0420
—CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD—
DTC DETECTING CONDITION:
Immediately at fault recognition (2200 cc Federal spec.
vehicles only)
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Engine stalls.
Idle mixture is out of specifications.
WIRING DIAGRAM:
B2M1097
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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10AQ1CHECK 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”.
NOTE:
In this case, it is not necessary to inspect DTC P0420.
: Go to step10AQ2.
10AQ2
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 step10AQ3.
OBD0525B
10AQ3
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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2-7ON-BOARD DIAGNOSTICS II SYSTEM
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H2M1365
AR: DTC P0440
—EVAPORATIVE EMISSION CONTROL
SYSTEM MALFUNCTION—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Gasoline smell
WIRING DIAGRAM:
B2M0919
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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![SUBARU LEGACY 1997 Service Repair Manual 10AR1CHECK 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”. <Ref. to 2-7 [T10A0].>
: Go SUBARU LEGACY 1997 Service Repair Manual 10AR1CHECK 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”. <Ref. to 2-7 [T10A0].>
: Go](/manual-img/17/57434/w960_57434-2093.png)
10AR1CHECK 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”.
: Go to step10AR2.
10AR2CHECK 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.
: 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 step10AR3.
OBD0005B
10AR3CHECK 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”.
: Go to step10AR4.
: Replace vent control solenoid valve.
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B2M1039B
10AR4CHECK 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”.
: Go to step10AR5.
: Replace purge control solenoid valve.
B2M0923B
10AR5CHECK 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”.
: Go to step10AR6.
: Replace pressure control solenoid valve.
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10AR6CHECK 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. Diagnostic Chart with Trouble Code for LHD Vehicles