engine SUBARU LEGACY 1996 Service Repair Manual

B2M0590A
10BJ3CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH.
1) Disconnect connector from ECM.
2) Measure resistance of harness between ECM and
transmission harness connector.
: Connector & terminal
(B84) No. 82—(B25) No. 1:
Is the resistance less than 1Ω?
: Go to next step 3).
: Repair open circuit in harness between ECM and
transmission harness connector.
B2M0591A
3) Measure resistance between ECM and chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
transmission harness connector.
: Go to next step 4).
OBD0472A
4) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(B25) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between transmission harness
connector and engine grounding terminal

Poor contact in coupling connector (B22)
: Is there poor contact in transmission har-
ness connector?
: Repair poor contact in transmission harness con-
nector.
: Replace ECM.
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10. Diagnostics Chart with Trouble Code

B2M0594A
10BK2CHECK HARNESS BETWEEN ECM AND
INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission.
3) Measure resistance of harness between ECM and
transmission harness connector.
: Connector & terminal
(B84) No. 82—(B12) No. 12:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
transmission harness connector.
B2M0595A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
transmission harness connector.
: Go to next step 5).
OBD0479A
5) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(B12) No. 11—Engine ground:
Is the resistance less than 5Ω?
: Go to step10BK3.
: Repair open circuit in inhibitor switch ground line.
320
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0481
BL: DTC P1102
—PRESSURE SOURCES SWITCHING
SOLENOID VALVE CIRCUIT MALFUNCTION
(BR)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling

Failure of engine to start
10BL1Check output signal from ECM.

10BL2Check harness between ECM and pressure
sources switching solenoid valve connector.
10BL3Check harness between ECM and pressure
sources switching solenoid valve connector.
10BL4Check pressure sources switching solenoid
valve.
10BL5Check power supply to pressure sources
switching solenoid valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.




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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.
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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.
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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.

WIRING DIAGRAM:
B2M0598

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

B2M0934A
4) Measure resistance of harness between combination
meter connector and chassis ground.
: Connector & terminal
(i12) No. 1—Chassis ground:
Is resistance less than 5Ω?
: Repair or replace combination meter.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between combination meter con-
nector and grounding terminal

Poor contact in combination meter connector

Poor contact in grounding terminal
H2M1414B
10BP3CHECK INPUT SIGNAL FOR ECM.
(USING VOLTAGE METER AND SUBARU
SELECT MONITOR.)
1) Turn ignition switch to ON. (Engine OFF)
2) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 27 (+)—Chassis ground ():
Is the voltage more than 4.75 V?
: Go to step10BP4.
: Go to next step 3).
H2M1414B
3) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 27 (+)—Chassis ground ():
Is the voltage less than 0.12 V?
: Go to step10BP9(LHD) or10BP10(RHD).
: Go to next.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0538
BR: DTC P1502
—RADIATOR FAN FUNCTION PROBLEM
(FAN
—F)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Occurrence of noise

Overheating
10BR1Check any other DTC (beside DTC P1502) on
display.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

NOTE:
If the vehicle, with the engine idling, is placed very close to
a wall or another vehicle, preventing normal cooling
function, the OBD system may detect malfunction.
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10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD Model
B2M0800
10BR1CHECK ANY OTHER DTC (BESIDE DTC
P1502) ON DISPLAY.
: Is there any other DTC on display?
: Inspect the relevant DTC using“10. Diagnostics
Chart with Trouble Code, 2-7 [T1000]”.
: Check engine cooling system. [K100].>
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0501
BS: DTC P1700
—THROTTLE POSITION SENSOR CIRCUIT
MALFUNCTION FOR AUTOMATIC
TRANSMISSION (ATTH)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Shift point too high or too low; engine brake not effected
in“3”range; excessive shift shock; excessive tight corner
“braking”
10BS1Check DTC P1700 on display.
Check throttle position sensor circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0613
10BS1
CHECK DTC P1700 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P1700?
: Check throttle position sensor circuit.
NOTE:
For the diagnostic procedure on throttle position sensor
circuit, refer to 3-2 [T7K0].

361
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code