SUBARU LEGACY 1997 Service Repair Manual

OBD0481
CA: DTC P1102
—PRESSURE SOURCES SWITCHING
SOLENOID VALVE CIRCUIT LOW INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Erroneous idling

Failure of engine to start
WIRING DIAGRAM:
B2M1308
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.
<Ref. to 2-7 [T3D0] and [T3E0].>
B2M0596A
10CA1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 15 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to next.
: Go to step10CA2.
: Is there poor contact in ECM connector?
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: Repair poor contact in ECM connector.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
OBD0488A
10CA2CHECK HARNESS BETWEEN ECM AND
PRESSURE SOURCES SWITCHING
SOLENOID VALVE CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from pressure sources switching
solenoid valve and ECM.
3) Measure resistance of harness between pressure
sources switching solenoid valve connector and engine
ground.
: Connector & terminal
(B1) No. 1—Engine ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and pressure sources switching solenoid
valve connector.
: Go to next step 4).
B2M0597A
4) Measure resistance of harness between ECM and pres-
sure sources switching solenoid valve connector.
: Connector & terminal
(B84) No. 15—(B1) No. 1:
Is the resistance less than 1Ω?
: Go to step10CA3.
: Repair open circuit in harness between ECM and
pressure sources switching solenoid valve con-
nector.
B2M1120
10CA3CHECK PRESSURE SOURCES SWITCH-
ING SOLENOID VALVE.
Measure resistance between pressure sources switching
solenoid valve connector terminals.
: Terminals
No. 1—No. 2:
Is the resistance between 10 and 100Ω?
: Go to step10CA4.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

: Replace pressure sources switching solenoid
valve.
OBD0676A
10CA4CHECK POWER SUPPLY TO PRESSURE
SOURCES SWITCHING SOLENOID
VA LV E .
1) Turn ignition switch to ON.
2) Measure voltage between pressure sources switching
solenoid valve harness connector and engine ground.
: Connector & terminal
(B1) No. 2 (+)—Engine ground ():
Is the voltage more than 10 V?
: Go to next.
: Repair open circuit in harness between main relay
and pressure sources switching solenoid valve
connector.
: Is there poor contact in pressure sources
switching solenoid valve connector?
: Repair poor contact in pressure sources switching
solenoid valve connector.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
342
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0489
CB: DTC P1103
—ENGINE TORQUE CONTROL SIGNAL
CIRCUIT MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Excessive shift shock
WIRING DIAGRAM:
B2M0598
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0599A
10CB1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 79 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next.
: Go to step10CB2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
B2M0600A
10CB2CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and TCM.
3) Measure resistance of harness between ECM and TCM
connector.
: Connector & terminal
(B84) No. 79—(B55) No. 16:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
TCM connector.
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B2M0601A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 79—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and TCM connector.
: Go to next.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Replace TCM.
345
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1121
CC: DTC P1104
—TCS SIGNAL CIRCUIT LOW INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

No operation TCS

TCS warning light remains illuminated.
WIRING DIAGRAM:
B2M0602
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0603A
10CC1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 61 (+)—Chassis ground ():
Is the voltage more than 2 V?
: Repair poor contact in ECM connector.
: Go to step10CC2.
B2M0604A
10CC2CHECK HARNESS BETWEEN ECM AND
TCS C/M CONNECTOR.
1) Turn ignition switch to OFF.
2) Remove front passenger side seat.
3) Tear off the floor mat.
4) Disconnect connectors from ECM and TCS C/M.
5) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 61—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and TCS C/M connector.
: Replace TCS C/M.
347
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1122
CD: DTC P1120
—STARTER SWITCH CIRCUIT HIGH
INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Failure of engine to start
WIRING DIAGRAM:
B2M1047
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10CD1CHECK OPERATION OF STARTER
MOTOR.
: Does starter motor operate when ignition
switch to“ON”?
NOTE:

On AT vehicles, place the inhibitor switch in each posi-
tion.

On MT vehicles, depress or release the clutch pedal.
: Repair battery short circuit in starter motor circuit.
After repair, replace ECM.
: Check starter motor circuit. <Ref. to 2-7 [T8B0].>
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10. Diagnostic Chart with Trouble Code for LHD Vehicles