1996 SUBARU LEGACY Ecu

OBD0380
AU: DTC P0710
—TRANSMISSION FLUID TEMPERATURE
SENSOR CIRCUIT MALFUNCTION (ATF)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No shift up to 4th speed (after engine warm-up)

No lock-up (after engine warm-up)

Excessive shift shock
10AU1Check DTC P0710 on display.
Check ATF temperature sensor circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
OBD0383
10AU1
CHECK DTC P0710 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0710?
: Check ATF temperature sensor circuit.
NOTE:
For the diagnostic procedure on transmission fluid tem-
perature sensor circuit, refer to 3-2 [T7F0].

293
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0392
AV: DTC P0720
—OUTPUT SPEED SENSOR (VEHICLE
SPEED SENSOR 1) CIRCUIT MALFUNCTION
(ATVSP)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No shift or excessive tight corner“braking”
10AV1Check DTC P0720 on display.
Check vehicle speed sensor 1 circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0584
10AV1
CHECK DTC P0720 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0720?
: Check vehicle speed sensor 1 circuit.
NOTE:
For the diagnostic procedure on vehicle speed sensor 1
circuit, refer to 3-2 [T7L0].

294
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0404
AW: DTC P0725
—ENGINE SPEED INPUT CIRCUIT
MALFUNCTION (ATNE)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No lock-up (after engine warm-up)

AT diagnostic indicator light (AT OIL TEMP indicator
light) remains on when vehicle speed is“0”.
10AW1Check DTC P0725 on display.
Check engine speed input signal circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0585
10AW1
CHECK DTC P0725 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0725?
: Check engine speed input signal circuit.
NOTE:
For the diagnostic procedure on engine speed input circuit,
refer to 3-2 [T7H0].

295
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0657
AX: DTC P0731
—GEAR 1 INCORRECT RATIO (ATGR1)—
B2M0658
AY: DTC P0732
—GEAR 2 INCORRECT RATIO (ATGR2)—
B2M0659
AZ: DTC P0733
—GEAR 3 INCORRECT RATIO (ATGR3)—
B2M0660
BA: DTC P0734
—GEAR 4 INCORRECT RATIO (ATGR4)—
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”
296
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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

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

B2M0663
BD: DTC P0748
—PRESSURE CONTROL SOLENOID (DUTY
SOLENOID A) ELECTRICAL (ATPL)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Excessive shift shock
10BD1Check DTC P0748 on display.
Check duty solenoid A circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
OBD0424
10BD1
CHECK DTC P0748 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0748?
: Check duty solenoid A circuit.
NOTE:
For the diagnostic procedure on duty solenoid A circuit,
refer to 3-2 [T7A0].

305
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0664
BE: DTC P0753
—SHIFT SOLENOID A (SHIFT SOLENOID 1)
ELECTRICAL (ATSFT1)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No shift
10BE1Check DTC P0753 on display.
Check shift solenoid 1 circuit.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
OBD0436
10BE1
CHECK DTC P0753 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0753?
: Check shift solenoid 1 circuit.
NOTE:
For the diagnostic procedure on shift solenoid 1 circuit,
refer to 3-2 [T7E0].

306
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code