Subaru Legacy (2005 year). Manual - part 628

5AT(diag)-103

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

7

CHECK INPUT SIGNAL FOR TCM USING 
SUBARU SELECT MONITOR.
1) Connect all the connectors.
2) Jack-up the vehicle and support with rigid 
racks.

NOTE:

Raise all wheels off floor.

3) Start the engine, and drive the vehicle.
4) Read the current data of front wheel speed 
using Subaru Select Monitor.
<Ref. to 5AT(diag)-17, OPERATION, Subaru 
Select Monitor.>

NOTE:

The speed difference between front and rear
wheels may light the ABS warning light, but this
indicates no malfunction. When AT control di-
agnosis is finished, perform the ABS memory
clearance procedure of on-board diagnostics
system. <Ref. to ABS(diag)-26, Clear Memory
Mode.>

Does the value of the front 
wheel speed depending on the 
acceleration and deceleration 
of the vehicle?

Even if the SPORT 
indicator lights 
blinks, the system 
is in normal condi-
tion. A temporary 
poor contact of 
connector or har-
ness may be the 
cause. Repair poor 
contact of har-
ness in ATF tem-
perature sensor 
and transmission 
connector.

Replace the trans-
mission harness.

Step

Check

Yes

No

5AT(diag)-104

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AI: DTC P1707 AT AWD SOLENOID VALVE CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:
Output signal circuit of transfer solenoid is open or shorted.
TROUBLE SYMPTOM:
• Tight corner braking phenomenon is occurred.
• Drivability getting worse.
WIRING DIAGRAM:

AT-03194

A5

A14

E

B23

B11

B54

B11

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

TRANSMISSION

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

T4

11

T11

1 2
5

8

6

9 10 11

3 4

12

T11

7

8

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

B55

B:

A:

B54

B55

A:

B:

TCM

5AT(diag)-105

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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

(B55) No. 23 — (B11) No. 8:
(B54) No. 5 — Chassis ground:
(B54) No. 14 — Chassis ground:

Is the resistance less than 1 
Ω?

Go to step 2.

Repair the open 
circuit of harness 
between TCM con-
nector and trans-
mission connector.

2

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND CHASSIS GROUND.
Measure the resistance of harness between 
TCM connector and chassis ground.

Connector & terminal

(B55) No. 23 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 3.

Repair the short 
circuit of harness 
between TCM con-
nector and trans-
mission connector.

3

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) Jack-up the vehicle and place it on rigid 
racks.

NOTE:

Raise all wheels off floor.

5) Drain the ATF.

CAUTION:

Do not drain the ATF until it cools down.

6) Remove the oil pan, and disconnect the 
control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.

Connector & terminal

(T4) No. 8 — (T11) No. 11:

Is the resistance less than 1 
Ω?

Go to step 4.

Repair the open 
circuit of harness 
between control 
valve body con-
nector and trans-
mission connector.

4

CHECK HARNESS CONNECTOR BETWEEN 
TRANSMISSION AND CONTROL VALVE 
BODY.
Measure the resistance between transmission 
ground and control valve body connector.

Connector & terminal

(T11) No. 11 — Transmission ground:

Is the resistance more than 1 
M

Ω?

Go to step 5.

Repair the short 
circuit of harness 
between control 
valve body con-
nector and trans-
mission ground.

5

CHECK AWD SOLENOID.
Measure the resistance between transmission 
ground and control valve body connector.

Connector & terminal

(T11) No. 11 — Transmission ground:

Is the resistance 3 — 9 

Ω

Go to step 6.

Replace the con-
trol valve body. 
<Ref. to 5AT-58, 
Control Valve 
Body.>

6

CHECK POOR CONTACT.
Check that there are no poor contact in TCM 
connector, transmission connector and control 
valve body connector.

Is there any loosing terminal, 
entering foreign matter, dam-
aging connector body?

Repair the poor 
contact.

Go to step 7.

5AT(diag)-106

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AJ:DTC P1710 TORQUE CONVERTER TURBINE 2 SPEED SIGNAL CIRCUIT 2 

MALFUNCTION

DTC DETECTING CONDITION:
Input signal circuit of TCM is open or shorted.
TROUBLE SYMPTOM:
• Excessive shift shock
• Does not shift to 5th
WIRING DIAGRAM:

7

CHECK AFTER REPAIR.
1) Perform the clear memory mode.
2) Drive for a while, read the DTC, and verify 
that there is no faulty.

Is DTC displayed?

Replace the TCM. 
<Ref. to 5AT-61, 
Transmission Con-
trol Module 
(TCM).>

Temporary poor 
contact or open 
circuit occurs. 
Recheck that the 
harness connec-
tor has no faulty.

Step

Check

Yes

No

AT-03195

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

1 2 3 4
5 6 7 8

B54

B55

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

B11

B12

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

B54

A:

B55

B:

A16

7

B11

T4

B12

T3

TCM

TURBINE SPEED SENSOR 2

TRANSMISSION

B22

6

E

B:

A:

15

3

T10

T11

1 2 3

6

8 9 10 11 12 13 14

4 5

15 16

T10

7

1 2
5

8

6

9 10 11

3 4

12

T11

7