engine SUBARU LEGACY 1996 Service Repair Manual

OBD0304
AC: DTC P0340
—CAMSHAFT POSITION SENSOR CIRCUIT
MALFUNCTION (CAM)—
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Engine stalls.

Failure of engine to start
10AC1Check harness between camshaft position
sensor and ECM connector.
10AC2Check camshaft position sensor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0530

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10. Diagnostics Chart with Trouble Code

OBD0720A
10AC1CHECK HARNESS BETWEEN CAM-
SHAFT POSITION SENSOR AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from camshaft position sensor.
3) Measure resistance of harness between camshaft posi-
tion sensor connector and engine ground.
: Connector & terminal
(E15) No. 1—Engine ground:
Is the resistance more than 100 kΩ?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between camshaft position sen-
sor and ECM connector

Poor contact in ECM connector

Poor contact in coupling connector (B20)
: Go to next.
OBD0720A
: Connector & terminal
(E15) No. 1—Engine ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between camshaft
position sensor connector and ECM connector.
NOTE:
The harness between both connectors are shielded.
Repair short circuit in harness together with shield.
: Go to next.
OBD0721A
: Connector & terminal
(E15) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to step10AC2.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between camshaft position sen-
sor and ECM connector

Poor contact in ECM connector

Poor contact in coupling connector (B20)
219
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10. Diagnostics Chart with Trouble Code

OBD0315
AD: DTC P0400
—EXHAUST GAS RECIRCULATION FLOW
MALFUNCTION (EGR)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Poor driving performance on low engine speed
10AD1Check transmission type.
10AD2Check DTC P0105, P0106, P0403, P1102 on
display.

10AD3Check vacuum line.
10AD4Check operation of EGR system.
Confirmation of actual driving
pattern
CAUTION:
Before confirmation of actual driving pattern, conduct
CLEAR MEMORY and INSPECTION MODES.





221
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10. Diagnostics Chart with Trouble Code

7) Start the engine.
: Does EGR valve operate at a throttle valve
opening of 5 to 10 degrees with visually
check?
: Possibly EGR valve malfunction may be due to
freezing or clogging by foreign matter. At this point
in time do not replace EGR valve, since it is not
faulty. And after the checking, go to
CONFIR-
MATION OF ACTUAL DRIVING PAT-
TERN.
NOTE:
If malfunction is detected again in the confirmation of actual
driving pattern, EGR valve is faulty. Go to next
.
: Go to next.
: Is there clogging in the gas outlets of intake
manifold or cylinder head, checking by
breathing into the outlets?
: Repair or replace intake manifold or cylinder
head. And go to
CONFIRMATION OF
ACTUAL DRIVING PATTERN.
: Clean EGR valve. And go toCONFIRMATION
OF ACTUAL DRIVING PATTERN.
CAUTION:
Do not use solvent when cleaning EGR valve
assembly, as it can damage diaphragm.
NOTE:

Remove and blow away the exhaust deposits. Make
sure the valve operates smoothly and the valve seat area
is completely cleaned.

Replace EGR valve as required.
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10. Diagnostics Chart with Trouble Code

OBD0145A
CONFIRMATION OF ACTUAL DRIVING
PATTERN.
1) Conduct CLEAR MEMORY and INSPECTION MODES.

2) Connect Subaru select monitor to its data link connec-
tor.
3) Start and warm-up the engine until the radiator fan
makes one complete rotation. (All accessory switches are
OFF.)
4) Turn Subaru select monitor switch to ON.
G3M0152
5) Designate mode using function key.
Function mode: FA4
B2M0564
6) Drive at 88±5 km/h (55±3 MPH) until the LED No. 2
comes on.
NOTE:
Keep the throttle valve opening at the same degree, since
diagnosis will be interrupted when the opening varies.
Diagnosis starts in 190 seconds after starting engine and
takes 4 seconds.
Put the gear to“D”range for the diagnosis.
H2M1206
7) Designate mode using function key.
Function mode: FB0
8) Confirm the“No trouble”indication on Subaru select
monitor.
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10. Diagnostics Chart with Trouble Code

OBD0323
AE: DTC P0403
—EXHAUST GAS RECIRCULATION CIRCUIT
MALFUNCTION (EGRSOL)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Poor driving performance on low engine speed
10AE1Check transmission type.
10AE2Check output signal from ECM.

10AE3Check harness between EGR solenoid valve
and ECM connector.
10AE4Check harness between EGR solenoid valve
and ECM connector.
10AE5Check EGR solenoid valve.
10AE6Check power supply to EGR solenoid valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.





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10. Diagnostics Chart with Trouble Code

OBD0327
5) Turn ignition switch to OFF.
6) Measure resistance between EGR solenoid valve ter-
minals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ω?
: Replace EGR solenoid valve and ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
OBD0678A
10AE4CHECK 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 short circuit in harness between ECM and
EGR solenoid valve connector.
: Go to next step 4).
B2M0567A
4) Measure resistance of harness between ECM and EGR
solenoid valve connector.
: Connector & terminal
(B84) No. 71—(E18) No. 2:
Is the resistance less than 1Ω?
: Go to step10AE5.
: Repair open circuit in harness between ECM and
EGR solenoid valve connector.
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10. Diagnostics Chart with Trouble Code

OBD0327
10AE5
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 step10AE6.
: Replace EGR solenoid valve.
OBD0328A
10AE6CHECK 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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10. Diagnostics Chart with Trouble Code

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

OBD0680A
10AI3CHECK HARNESS BETWEEN PURGE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from purge control solenoid
valve and ECM.
3) Measure resistance of harness between purge control
solenoid valve connector and engine ground.
: Connector & terminal
(E4) No. 2—Engine ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
purge control solenoid valve connector.
: Go to next step 4).
B2M0571A
4) Measure resistance of harness between ECM and
purge control solenoid valve of harness connector.
: Connector & terminal
(B84) No. 72—(E4) No. 2:
Is the resistance less than 1Ω?
: Go to step10AI4.
: Repair open circuit in harness between ECM and
purge control solenoid valve connector.
OBD0338
10AI4CHECK PURGE CONTROL SOLENOID
VA LV E .
1) Remove purge control solenoid valve.
2) Measure resistance between purge control solenoid
valve terminals.
: Terminals
No. 1—No. 2:
Is the resistance between 10 and 100Ω?
: Go to step10AI5.
: Replace purge control solenoid valve.
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10. Diagnostics Chart with Trouble Code