SUBARU LEGACY 1996 Service Repair Manual

WIRING DIAGRAM:

LHD Model
B2M0534
323
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD Model
B2M0786
B2M0596A
10BL1
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 step10BL2.
: Go to step10BL3.
324
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0596A
10BL2CHECK 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.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 15 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair short circuit in harness between ECM and
pressure sources switching solenoid valve con-
nector and replace ECM.
: Go to next step 5).
OBD0485
5) Turn ignition switch to OFF.
6) Measure resistance between pressure sources switch-
ing solenoid valve connector terminals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ω?
: Replace pressure sources switching solenoid
valve and ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
325
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0488A
10BL3CHECK 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 short circuit in harness between ECM and
pressure sources switching solenoid valve con-
nector.
: 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 step10BL4.
: Repair open circuit in harness between ECM and
pressure sources switching solenoid valve con-
nector.
OBD0485
10BL4CHECK 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 step10BL5.
: Replace pressure sources switching solenoid
valve.
326
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0676A
10BL5CHECK 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.
327
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0489
BM: DTC P1103
—ENGINE TORQUE CONTROL SIGNAL
CIRCUIT MALFUNCTION (TRQ)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Excessive shift shock
10BM1Check input signal for ECM.
10BM2Check harness between ECM and TCM
connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
WIRING DIAGRAM:
B2M0598

328
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0599A
10BM1
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 step10BM2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
B2M0600A
10BM2CHECK 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.
329
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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 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.
330
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

H2M1406
BN: DTC P1400
—FUEL TANK PRESSURE CONTROL
SOLENOID VALVE CIRCUIT MALFUNCTION
(PCVSOL)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10BN1Check output signal from ECM.

10BN2Check harness between fuel tank pressure
control solenoid valve and ECM connector.
10BN3Check harness between fuel tank pressure
control solenoid valve and ECM connector.
10BN4Check fuel tank pressure control solenoid
valve.
10BN5Check power supply to fuel tank pressure
control solenoid valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>



331
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

LHD Model
B2M0928
332
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code