check engine SUBARU LEGACY 1996 Service Repair Manual

10BB2
CHECK DUTY SOLENOID B CIRCUIT.
: Is there any trouble in duty solenoid B cir-
cuit?
NOTE:
For the diagnostic procedure on duty solenoid B circuit,
refer to 3-2 [T7B0].
: Repair or replace duty solenoid B circuit.
: Go to step10BB3.
10BB3CHECK THROTTLE POSITION SENSOR
CIRCUIT.
: Is there any trouble in throttle position sen-
sor circuit?
NOTE:
For the diagnostic procedure on throttle position sensor
circuit, refer to 3-2 [T7K0].
: Repair or replace throttle position sensor circuit.
: Go to step10BB4.
10BB4CHECK VEHICLE SPEED SENSOR 1 CIR-
CUIT.
: Is there any trouble in vehicle speed sensor
1 circuit?
NOTE:
For the diagnostic procedure on vehicle speed sensor 1
circuit, refer to 3-2 [T7L0].
: Repair or replace vehicle speed sensor 1 circuit.
: Go to step10BB5.
10BB5CHECK VEHICLE SPEED SENSOR 2 CIR-
CUIT.
: Is there any trouble in vehicle speed sensor
2 circuit?
NOTE:
For the diagnostic procedure on vehicle speed sensor 2
circuit, refer to 3-2 [T7M0].
: Repair or replace vehicle speed sensor 2 circuit.
: Go to step10BB6.
10BB6
CHECK ENGINE SPEED INPUT CIRCUIT.
: Is there any trouble in engine speed input
circuit?
NOTE:
For the diagnostic procedure on engine speed input signal
circuit, refer to 3-2 [T7H0].
: Repair or replace engine speed input circuit.
: Go to step10BB7.
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10. Diagnostics Chart with Trouble Code

B2M0662
BC: DTC P0743
—TORQUE CONVERTER CLUTCH SYSTEM
(DUTY SOLENOID B) ELECTRICAL (ATLU)
—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No lock-up (after engine warm-up)
10BC1Check DTC P0743 on display.
Check duty solenoid B circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
OBD0413
10BC1
CHECK DTC P0743 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0743?
: Check duty solenoid B circuit.
NOTE:
For the diagnostic procedure on duty solenoid B circuit,
refer to 3-2 [T7B0].

304
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10. Diagnostics Chart with Trouble Code

B2M0666
BG: DTC P0760
—SHIFT SOLENOID C (SHIFT SOLENOID 3)
MALFUNCTION (ATOVR
—F)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Ineffective engine brake with selector lever in“3”
10BG1Check any other DTC (besides DTC P0760) on
display.
10BG2Check inhibitor switch circuit. DTC P0705, 2-7 [T10AT0].>
10BG3Check gear position.
10BG4Check shift solenoid 1 circuit. [T7E0].>
10BG5Check shift solenoid 2 circuit. [T7D0].>
10BG6Check shift solenoid 3 circuit. [T7C0].>
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.






308
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10. Diagnostics Chart with Trouble Code

OBD0145A
10BG3
CHECK GEAR POSITION.
1) Turn ignition switch to OFF.
2) Connect the Subaru select monitor to data link connec-
tor.
3) Lift-up or raise the vehicle and support with safety
stands.
CAUTION:
On AWD models, raise all wheels off ground.
4) Start and warm-up the engine and transmission.
H2M1150
5) Subaru select monitor switch to ON.
6) Select AT mode using function key.
Press the function key [/], and change to AT mode.
7) Press the function key [0].
G3M0152
8) Designate mode using function key.
Function mode for AT: F10
OBD0615
9) Move selector lever to“D”and drive the vehicle.
10) Read data on Subaru select monitor.
: Does gear position change according to
throttle position and vehicle speed?
: Go to next.
: Go to step10BG4.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Go to next.
: Is there any mechanical trouble in automatic
transmission?
: Repair or replace automatic transmission.
: Replace TCM.
310
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0667
BH: DTC P0763
—SHIFT SOLENOID C (SHIFT SOLENOID 3)
ELECTRICAL (ATOVR)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Ineffective engine brake with selector lever in“3”
10BH1Check DTC P0763 on display.
Check shift solenoid 3 circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
OBD0452
10BH1
CHECK DTC P0763 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0763?
: Check shift solenoid 3 circuit.
NOTE:
For the diagnostic procedure on shift solenoid 3 circuit,
refer to 3-2 [T7C0].

312
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0458
BI: DTC P1100
—STARTER SWITCH CIRCUIT
MALFUNCTION (ST
—SW)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Failure of engine to start
10BI1Check operation of starter motor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0516
313
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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.
317
2-7ON-BOARD DIAGNOSTICS II SYSTEM
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.




322
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