engine SUBARU LEGACY 1997 Service Repair Manual

OBD0304
AM: DTC P0340
—CAMSHAFT POSITION SENSOR CIRCUIT
MALFUNCTION—
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Engine stalls.

Failure of engine to start
WIRING DIAGRAM:
B2M1055
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

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OBD0720A
10AM1CHECK 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 ground short circuit in harness between
camshaft position sensor connector and ECM
connector.
NOTE:
The harness between both connectors are shielded.
Repair ground short circuit in harness together with shield.
: Go to next.
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OBD0721A
: Connector & terminal
(E15) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to step10AM2.
: 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)
10AM2
CHECK CAMSHAFT POSITION SENSOR.
: Is the camshaft position sensor installation
bolt tightened securely?
: Go to next step 1).
: Tighten camshaft position sensor installation bolt
securely.
G2M0639
1) Remove camshaft position sensor.
2) Measure resistance between connector terminals of
camshaft position sensor.
: Terminals
No. 1—No. 2:
Is the resistance between 1 and 4 kΩ?
: Repair poor contact in camshaft position sensor
connector.
: Replace camshaft position sensor.
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B2M1092
AN: DTC P0341
—CAMSHAFT POSITION SENSOR CIRCUIT
RANGE/PERFORMANCE PROBLEM—
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Engine stalls.

Failure of engine to start
WIRING DIAGRAM:
B2M1055
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

230
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0315
AO: DTC P0400
—EXHAUST GAS RECIRCULATION FLOW
MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Poor driving performance on low engine speed
WIRING DIAGRAM:
B2M1093
CAUTION:
Before confirmation of actual driving pattern, conduct
CLEAR MEMORY and INSPECTION MODES.

232
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10AO1
CHECK ENGINE/TRANSMISSION TYPE.
: Is engine/transmission type 2200 cc/MT?
: Check AT/MT identification circuit. [T10DD0].>
: Go to step10AO2.
10AO2CHECK DTC P0106, P0107, P0108, P0403,
P1102, P1122 OR P1421 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0106,
P0107, P0108, P0403, P1102, P1122 or
P1421?
:
Inspect DTC P0106, P0107, P0108, P0403,
P1102, P1122 or P1421 using“10. Diagnostics
Chart with Trouble Code”.

Manually check that EGR valve diaphragm is
not stuck.
WARNING:
Be careful when checking EGR valve, since it may be
extremely hot.
NOTE:
In this case, it is not necessary to inspect DTC P0400.
After checking the above item, go to
CONFIRMATION
OF ACTUAL DRIVING PATTERN.
: Go to step10AO3.
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B2M1095
4) Turn ignition switch to OFF.
5) Disconnect connector from EGR solenoid valve.
6) Connect 12 V battery’s ground
terminal to one ter-
minal of the EGR solenoid valve. Then connect 12 V bat-
tery’sterminal to the other terminal of it.
CAUTION:
Do not use the 12 V battery installed in the vehicle,
because the electrical system may be damaged.
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 PATTERN.
NOTE:
If malfunction is detected again in the confirmation of actual
driving pattern, EGR valve is faulty. Go to next step 8).
: Go to next step 8).
8) Turn ignition switch to OFF.
: 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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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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OBD0323
AP: DTC P0403
—EXHAUST GAS RECIRCULATION CIRCUIT
LOW INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Poor driving performance on low engine speed
WIRING DIAGRAM:
B2M1096
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

237
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

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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10. Diagnostic Chart with Trouble Code for LHD Vehicles