SUBARU LEGACY 1995 Service Repair Manual

1.Check harness connector between TCM and
inhibitor switch.
2.Check inhibitor switch.
3.Check input signal for TCM.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>
WIRING DIAGRAM:
OBD0594


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11. Diagnostics Chart with Trouble Code

OBD0596A
1CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and transmission.
3) Measure resistance of harness connector between
TCM and transmission.
: Connector & terminal
(B56) No. 9—(B12) No. 3 / 1Ω, or less
(B56) No. 10—(B12) No. 2 / 1Ω, or less
(B56) No. 8—(B12) No. 1 / 1Ω, or less
(B54) No. 1—(B12) No. 8 / 1Ω, or less
(B54) No. 2—(B12) No. 7 / 1Ω, or less
(B54) No. 3—(B12) No. 6 / 1Ω, or less
(B54) No. 4—(B12) No. 5 / 1Ω, or less
: Repair open circuit of harness between TCM and
transmission.
: Go to next step.
OBD0597A
4) Measure resistance of harness connector between
TCM and body.
: Connector & terminal
(B56) No. 9—Body / 1 MΩ, or more
(B56) No. 10—Body / 1 MΩ, or more
(B56) No. 8—Body / 1 MΩ, or more
(B54) No. 1—Body / 1 MΩ, or more
(B54) No. 2—Body / 1 MΩ, or more
(B54) No. 3—Body / 1 MΩ, or more
(B54) No. 4—Body / 1 MΩ, or more
: Go to step 2.
: Repair short circuit of harness between TCM and
body.
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11. Diagnostics Chart with Trouble Code

OBD0598A
2
CHECK INHIBITOR SWITCH.
Measure resistance between transmission connector
receptacle’s terminals.
: Connector & terminal
(T3) No. 3—No. 4 / 1Ω, or less (“P”posi-
tion)
(T3) No. 3—No. 4 / 1 MΩ, or more (Other
positions)
(T3) No. 2—No. 4 / 1Ω, or less (“R”posi-
tion)
(T3) No. 2—No. 4 / 1 MΩ, or more (Other
positions)
(T3) No. 1—No. 4 / 1Ω, or less (“N”posi-
tion)
(T3) No. 1—No. 4 / 1 MΩ, or more (Other
positions)
(T3) No. 8—No. 4 / 1Ω, or less (“D”posi-
tion)
(T3) No. 8—No. 4 / 1 MΩ, or more (Other
positions)
(T3) No. 7—No. 4 / 1Ω, or less (“3”posi-
tion)
(T3) No. 7—No. 4 / 1 MΩ, or more (Other
positions)
(T3) No. 6—No. 4 / 1Ω, or less (“2”posi-
tion)
(T3) No. 6—No. 4 / 1 MΩ, or more (Other
positions)
(T3) No. 5—No. 4 / 1Ω, or less (“1”posi-
tion)
(T3) No. 5—No. 4 / 1 MΩ, or more (Other
positions)
: Go to step 3.
: Go to next.
: Is there faulty connection in the selector
cable?
: Repair connection of selector cable.
: Replace inhibitor switch.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0595A
3
CHECK INPUT SIGNAL FOR TCM.
1) Turn ignition switch to OFF.
2) Connect connector to TCM and transmission.
3) Turn ignition switch to ON.
4) Measure voltage between TCM and body.
: Connector & terminal
(B56) No. 9—Body / 1 V, or less (“P”and
“N”positions)
(B56) No. 9—Body / 8 V, or more (Other
positions)
(B56) No. 10—Body / 1 V, or less (“R”
position)
(B56) No. 10—Body / 6 V, or more (Other
positions)
(B56) No. 8—Body / 1 V, or less (“N”and
“P”positions)
(B56) No. 8—Body / 8 V, or more (Other
positions)
(B54) No. 1—Body / 1 V, or less (“D”posi-
tion)
(B54) No. 1—Body / 6 V, or more (Other
positions)
(B54) No. 2—Body / 1 V, or less (“3”posi-
tion)
(B54) No. 2—Body / 6 V, or more (Other
positions)
(B54) No. 3—Body / 1 V, or less (“2”posi-
tion)
(B54) No. 3—Body / 6 V, or more (Other
positions)
(B54) No. 4—Body / 1 V, or less (“1”posi-
tion)
(B54) No. 4—Body / 6 V, or more (Other
positions)
: Repair poor contact in TCM connector.
: Go to next.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Replace TCM with a new one.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0380
AO: DTC P0710
—TRANSMISSION FLUID TEMPERATURE
SENSOR CIRCUIT MALFUNCTION (ATF)—
H2M1145
DESCRIPTION:
This sensor is mounted to the control valve in the transmis-
sion. It detects temperature change as an analog electrical
signal. The output characteristics of the sensor are shown
in the illustration.
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

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

No lock-up occurs. (after engine warm-up)

Excessive shift shock
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11. Diagnostics Chart with Trouble Code

1.Check harness connector between TCM and
ATF temperature sensor.
2.Check ATF temperature sensor.
3.Check input signal for TCM.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>
WIRING DIAGRAM:
OBD0383
NOTE:
For the diagnostic procedure on transmission fluid tem-
perature sensor circuit, refer to“3-2 [T7G0]”.


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11. Diagnostics Chart with Trouble Code

OBD0392
AP: DTC P0720
—OUTPUT SPEED SENSOR (VEHICLE
SPEED SENSOR 1) CIRCUIT MALFUNCTION
(ATVSP)—
OBD0393A
DESCRIPTION:
[FWD model]

The vehicle speed sensor 1 is mounted to the transmis-
sion case (at the rear side of the case). The sensor outputs
a pulse signal which is transmission to the TCM where it is
converted to vehicle speed.

Vehicle speed sensor 1 on FWD model detects front-
wheel speed.
OBD0394A
[AWD]

The vehicle speed sensor 1 (output shaft rotation sen-
sor) is mounted to the extension case (from the outside of
the case). The sensor outputs a pulse signal which is trans-
mitted to the TCM where it is converted to vehicle speed.

The transfer clutch drum is connected directly to the rear
wheel driving propeller shaft. Vehicle speed sensor 1 on
the AWD model defects rear-wheel speed.
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No shift or excessive tight corner“braking”
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11. Diagnostics Chart with Trouble Code

1.Check harness connector between TCM and
vehicle speed sensor 1.
2.Check vehicle speed sensor 1.
3.Check input signal for TCM.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>
WIRING DIAGRAM:
B2M0628
NOTE:
For the diagnostic procedure on vehicle speed sensor 1
circuit, refer to“3-2 [T7M0]”.


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

OBD0404
AQ: DTC P0725
—ENGINE SPEED INPUT CIRCUIT
MALFUNCTION (ATNE)—
DESCRIPTION:
The engine speed signal is sent to TCM from ECM. This
signal is used for lock-up clutch control and line pressure
control.
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

No lock-up occurs. (after engine warm-up)

AT diagnostic indicator light (AT OIL TEMP indicator
light) remains on when vehicle speed is“0”.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

1.Check harness connector between TCM and
ECM (MFI).
2.Check input signal for TCM.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>
WIRING DIAGRAM:
OBD0405
NOTE:
For the diagnostic procedure on engine speed input circuit,
refer to“3-2 [T7I0]”.

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