Subaru Legacy IV (2008 year). Service manual - part 756

 

  Index      Subaru     Subaru Legacy IV - service and repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  754  755  756  757   ..

 

 

Subaru Legacy IV (2008 year). Service manual - part 756

 

 

5AT(diag)-39

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

B: DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT LOW 

INPUT

DTC DETECTING CONDITION:
Input signal circuit to ATF temperature sensor is open.
TROUBLE SYMPTOM:
Excessive shift shock
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and 
transmission.
3) Measure the resistance of harness between 
TCM and transmission connector.

Connector & terminal

(B54) No. 17 — (B11) No. 5:
(B54) No. 18 — (B11) No. 12:

Is the resistance less than 1 

:? Go to step 2.

Repair the open 
circuit of harness 
between TCM and 
transmission con-
nector.

2

CHECK ATF OIL TEMPERATURE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the connectors to transmission and 
TCM.
3) Turn the ignition switch to ON and start 
engine.
4) Warm up the transmission until the ATF 
temperature exceeds 80°C (176°F).

NOTE:
If the ambient temperature is below 0°C (32°F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
5) Disconnect the connector from transmis-
sion.
6) Measure the resistance between transmis-
sion connector terminals.

Connector & terminal

(T4) No. 5 — (T4) No. 12:

Is the resistance 300 — 800 

:? Go to step 3.

Go to step 5.

TCM

B11

1

2

3 4

5

6 7

8

9

13

14 15

20

19

17

16

10

11 12

18

18

B54

B11

T10

T4

12

B54

5

6

7 8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31

35

 CONTROL VALVE BODY

T10

1 2 3 4
6 7 8 9

5

10

17

5

4

3

T20

A

TF TEMPERA

TURE 

 

SENSOR

AT-04348

5AT(diag)-40

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

3

CHECK ATF OIL TEMPERATURE SENSOR.
Measure the resistance between transmission 
connector terminals.

Connector & terminal

(T4) No. 5 — (T4) No. 12:

Does the resistance value 
increase while the ATF temper-
ature decreases?

Go to step 4.

Go to step 5.

4

CHECK INPUT SIGNAL FOR TCM USING 
SUBARU SELECT MONITOR.
1) Connect the connector.
2) Turn the ignition switch to ON. (engine OFF)
3) Read the ATF temperature using Subaru 
Select Monitor.

Does the ATF temperature 
gradually decrease?

Even if the AT OIL 
TEMP light blinks, 
the system is in 
normal condition. 
A temporary poor 
contact of connec-
tor or harness may 
be the cause. 
Repair the poor 
contact of harness 
between ATF oil 
temperature sen-
sor and transmis-
sion connector.

Go to step 6.

5

CHECK HARNESS CONNECTOR BETWEEN 
TRANSMISSION AND CONTROL VALVE 
BODY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from 
bracket.
4) Lift up the vehicle.

NOTE:
Raise all wheels off the floor.
5) Drain the ATF.

CAUTION:
Do not drain ATF until it cools down.
6) Remove the oil pan, and disconnect the 
connector from control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.

Connector & terminal

(T4) No. 12 — (T10) No. 4:
(T4) No. 5 — (T10) No. 3:

Is the resistance less than 1 

:? Replace the con-

trol valve body. 
<Ref. to 5AT-57, 
Control Valve 
Body.>

Repair the open 
circuit of harness 
between transmis-
sion connector and 
control valve body 
connector.

6

CHECK POOR CONTACT.

Is there poor contact in ATF oil 
temperature sensor circuit?

Repair the poor 
contact.

Replace the TCM. 
<Ref. to 5AT-60, 
Transmission Con-
trol Module 
(TCM).>

Step

Check

Yes

No

5AT(diag)-41

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

C: DTC P0713 TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT HIGH 

INPUT

DTC DETECTING CONDITION:
Input signal circuit to ATF oil temperature sensor is shorted.
TROUBLE SYMPTOM:
Excessive shift shock
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and 
transmission.
3) Measure the resistance of harness between 
TCM connector and chassis ground.

Connector & terminal

(B54) No. 17 — Chassis ground:
(B54) No. 18 — Chassis ground:

Is the resistance 1 M

: or 

more?

Go to step 2.

Repair the short 
circuit of harness 
between TCM and 
transmission con-
nector.

2

CHECK ATF OIL TEMPERATURE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the connectors to transmission and 
TCM.
3) Turn the ignition switch to ON and start 
engine.
4) Warm up the transmission until the ATF 
temperature exceeds 80°C (176°F).

NOTE:
If the ambient temperature is below 0°C (32°F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
5) Disconnect the connector from transmis-
sion.
6) Measure the resistance between transmis-
sion connector terminals.

Connector & terminal

(T4) No. 5 — (T4) No. 12:

Is the resistance 300 — 800 

:? Go to step 3.

Go to step 5.

TCM

B11

1

2

3 4

5

6 7

8

9

13

14 15

20

19

17

16

10

11 12

18

18

B54

B11

T10

T4

12

B54

5

6

7 8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31

35

 CONTROL VALVE BODY

T10

1 2 3 4
6 7 8 9

5

10

17

5

4

3

T20

A

TF TEMPERA

TURE 

 

SENSOR

AT-04348

5AT(diag)-42

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

3

CHECK ATF OIL TEMPERATURE SENSOR.
Measure the resistance between transmission 
connector terminals.

Connector & terminal

(T4) No. 5 — (T4) No. 12:

Does the resistance value 
increase while the ATF temper-
ature decreases?

Go to step 4.

Go to step 5.

4

CHECK INPUT SIGNAL FOR TCM USING 
SUBARU SELECT MONITOR.
1) Connect the connector.
2) Turn the ignition switch to ON. (engine OFF)
3) Read the ATF temperature using Subaru 
Select Monitor.

Does the ATF temperature 
gradually decrease?

Even if the AT OIL 
TEMP light blinks, 
the system is in 
normal condition. 
A temporary poor 
contact of connec-
tor or harness may 
be the cause. 
Repair the poor 
contact of harness 
between ATF oil 
temperature sen-
sor and transmis-
sion connector.

Go to step 6.

5

CHECK HARNESS CONNECTOR BETWEEN 
TRANSMISSION AND CONTROL VALVE 
BODY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from 
bracket.
4) Lift up the vehicle.

NOTE:
Raise all wheels off the floor.
5) Drain the ATF.

CAUTION:
Do not drain ATF until it cools down.
6) Remove the oil pan, and disconnect the 
connector from control valve body connector.
7) Measure the resistance between chassis 
ground and control valve body connector.

Connector & terminal

(T10) No. 3 — Chassis ground:
(T10) No. 4 — Chassis ground:

Is the resistance 1 M

: or 

more?

Replace the con-
trol valve body. 
<Ref. to 5AT-57, 
Control Valve 
Body.>

Repair the short 
circuit of harness 
between transmis-
sion connector and 
control valve body 
connector.

6

CHECK POOR CONTACT.

Is there poor contact in ATF oil 
temperature sensor circuit?

Repair the poor 
contact.

Replace the TCM. 
<Ref. to 5AT-60, 
Transmission Con-
trol Module 
(TCM).>

Step

Check

Yes

No

 

 

 

 

 

 

 

Content   ..  754  755  756  757   ..