Page 2065 of 2890
10BA1Check any other DTC (besides DTC P0731,
P0732, P0733, P0734) on display.
10BA2Check throttle position sensor circuit.
3-2 [T7K0].>
10BA3Check vehicle speed sensor 1 circuit.
3-2 [T7L0].>
10BA4Check vehicle speed sensor 2 circuit.
3-2 [T7M0].>
10BA5Check engine speed input circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
297
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2066 of 2890
WIRING DIAGRAM:
B2M0586
10BA1CHECK ANY OTHER DTC (BESIDES DTC
P0731, P0732, P0733, P0734) ON DIS-
PLAY.
: Is there any other DTC on display?
: Inspect relevant DTC using“10. Diagnostics Chart
with Trouble Code, 2-7 [T1000]”.
: Go to step10BA2.
298
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2067 of 2890
![SUBARU LEGACY 1996 Service Repair Manual 10BA2CHECK 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].
SUBARU LEGACY 1996 Service Repair Manual 10BA2CHECK 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].](/manual-img/17/57433/w960_57433-2066.png)
10BA2CHECK 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 step10BA3.
10BA3CHECK 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 step10BA4.
10BA4CHECK 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 step10BA5.
10BA5
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 next.
: 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.
299
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10. Diagnostics Chart with Trouble Code
Page 2068 of 2890
B2M0661
BB: DTC P0740
—TORQUE CONVERTER CLUTCH SYSTEM
MALFUNCTION (ATLU
—F)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
TROUBLE SYMPTOM:
No lock-up (after engine warm-up)
No shift or excessive tight corner“braking”
10BB1Check any other DTC (besides DTC P0740) on
display.
10BB2Check duty solenoid B circuit.
[T7B0].>
10BB3Check throttle position sensor circuit.
3-2 [T7K0].>
10BB4Check vehicle speed sensor 1 circuit.
3-2 [T7L0].>
10BB5Check vehicle speed sensor 2 circuit.
3-2 [T7M0].>
10BB6Check engine speed input circuit.
[T7H0].>
10BB7Check inhibitor switch circuit.
DTC P0705, 2-7 [T10AT0].>
10BB8Check brake light switch circuit.
DTC P0703, 2-7 [T10AS0].>
10BB9Check ATF temperature sensor circuit.
3-2 [T7F0].>
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
300
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2069 of 2890
WIRING DIAGRAM:
B2M0587
10BB1CHECK ANY OTHER DTC (BESIDES DTC
P0740) ON DISPLAY.
: Is there any other DTC on display?
: Inspect the relevant DTC using“10. Diagnostics
Chart with Trouble Code, 2-7 [T1000]”.
: Go to step10BB2.
301
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2070 of 2890
![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 s 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 s](/manual-img/17/57433/w960_57433-2069.png)
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.
302
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2071 of 2890
![SUBARU LEGACY 1996 Service Repair Manual 10BB7
CHECK INHIBITOR SWITCH CIRCUIT.
: Is there any trouble in inhibitor switch cir-
cuit?
NOTE:
For the diagnostic procedure on inhibitor switch circuit,
refer to 2-7 [T10AT0].
: Repair or replace i SUBARU LEGACY 1996 Service Repair Manual 10BB7
CHECK INHIBITOR SWITCH CIRCUIT.
: Is there any trouble in inhibitor switch cir-
cuit?
NOTE:
For the diagnostic procedure on inhibitor switch circuit,
refer to 2-7 [T10AT0].
: Repair or replace i](/manual-img/17/57433/w960_57433-2070.png)
10BB7
CHECK INHIBITOR SWITCH CIRCUIT.
: Is there any trouble in inhibitor switch cir-
cuit?
NOTE:
For the diagnostic procedure on inhibitor switch circuit,
refer to 2-7 [T10AT0].
: Repair or replace inhibitor switch circuit.
: Go to step10BB8.
10BB8
CHECK BRAKE LIGHT SWITCH CIRCUIT.
: Is there any trouble in brake light switch cir-
cuit?
NOTE:
For the diagnostic procedure on brake light switch circuit,
refer to 2-7 [T10AS0].
: Repair or replace brake light switch circuit.
: Go to step10BB9.
10BB9CHECK ATF TEMPERATURE SENSOR
CIRCUIT.
: Is there any trouble in ATF temperature sen-
sor circuit?
NOTE:
For the diagnostic procedure on ATF temperature sensor
circuit, refer to 3-2 [T7F0].
: Repair or replace ATF temperature sensor circuit.
: Go to next.
: 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.
303
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10. Diagnostics Chart with Trouble Code
Page 2072 of 2890
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
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code