Subaru Legacy (2005 year). Manual - part 611

5AT(diag)-35

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

14.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT (PRNDL INPUT)

DTC DETECTING CONDITION:
The inhibitor switch is open or short.
TROUBLE SYMPTOM:
• Shift characteristics are erroneous.
• Shift indicator light does not match with select lever.
• Shift indicator light does not illuminate.
• N-D, N-R shock occur.

5AT(diag)-36

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

AT-03174

3

4

21

1

22

7

P

R

N

D

i10

i77

i10

i77

i84

B280

B12

i84

A:

B280

B:

2

8

A27

A26

B20

B30

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

12

11

10

9

8

7

6

5

4

3

2

1

8

7

6

5

4

3

2

1

22 23

21

20

19

16

15

14

13

12

11

10

9

34 35

33

32

17
30

18
31

29

28

27

26

25

24

8

7

6

5

4

3

2

1

22

23

21

20

19

16

15

14

13

12

11

10

9

17

30

18

29

28

27

26

25

24

MAIN SBF

SBF-6

No.5

E

B

A

TTER

Y

COMBINATION
METER

JOINT
CONNECTOR

BODY INTEGRATED MODULE

TRANSMISSION

A:

B:

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

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

A4

A3

B3

B13

B20

B4

B14

3

1

4

2

8

TCM

B54

A:

B55

B:

B12

T3

E

A:

B:

1 2 3 4
5 6 7 8

5AT(diag)-37

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK DTC OF TCM.

Is DTC of AT CAN communica-
tion circuit displayed?

Perform the diag-
nosis according to 
DTC.

Go to step 2.

2

CHECK INHIBITOR SWITCH.
1) Shift the select lever to “P” range.
2) Check input signal of inhibitor SW 1 — 4 
and inhibitor SW 3 monitor using Subaru 
Select Monitor.

Are all indications High?

Go to step 4.

Go to step 3.

3

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 between TCM con-
nector and chassis ground about the item 
which indicated Low on step 2.

Connector & terminal

(B55) No. 4 — Chassis ground:
(B55) No. 3 — Chassis ground:
(B55) No. 14 — Chassis ground:
(B55) No. 13 — Chassis ground:
(B55) No. 20 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 6.

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

4

CHECK INHIBITOR SWITCH.
1) Shift the select lever to “D” range.
2) Check input signal of inhibitor SW 1 — 4 
and inhibitor SW 3 monitor using Subaru 
Select Monitor.

Are all indications Low?

Go to step 6.

Go to step 5.

5

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 
about the item which indicated High on step 4.

Connector & terminal

(B55) No. 4 — (B12) No. 4:
(B55) No. 3 — (B12) No. 3:
(B55) No. 14 — (B12) No. 2:
(B55) No. 13 — (B12) No. 1:
(B55) No. 20 — (B12) No. 8:

Is the resistance less than 1 
Ω?

Go to step 6.

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

6

CHECK INPUT SIGNAL FOR TCM USING 
CIRCUIT TESTER.
1) Turn the ignition switch to OFF.
2) Disconnect the transmission connector 
(B12).
3) Connect the TCM connector.
4) Turn the ignition switch to ON.
5) Measure the voltage between TCM termi-
nals.

Connector & terminal

(B55) No. 4 — (B54) No. 19:
(B55) No. 3 — (B54) No. 19:
(B55) No. 14 — (B54) No. 19:
(B55) No. 13 — (B54) No. 19:
(B55) No. 20 — (B54) No. 19:

Is the voltage 4 — 6 V for the 
inhibitor SW 1 — 4? / Is the 
voltage 3.5 — 5.5 V for the 
inhibitor SW 3 monitor?

Go to step 8.

Go to step 7.

5AT(diag)-38

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

7

CHECK TCM I/O SIGNAL.
Check I/O signal of power supply, ground and 
PVIGN power supply relay.
<Ref. to 5AT(diag)-13, ELECTRICAL SPECIFI-
CATION, Transmission Control Module (TCM) 
I/O Signal.>

Is TCM I/O signal OK?

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

Repair the open or 
short circuit for 
power supply and 
ground. Perform 
the diagnosis 
according to DTC 
for PVIGN power 
supply relay.

8

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 
connector from control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.

Connector & terminal

(T3) No. 4 — (T10) No. 6:
(T3) No. 3 — (T10) No. 5:
(T3) No. 2 — (T10) No. 4:
(T3) No. 1 — (T10) No. 3:
(T3) No. 8 — (T10) No. 2:

Is the resistance less than 1 
Ω?

Go to step 9.

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

9

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

Connector & terminal

(T10) No. 6 — Transmission ground:
(T10) No. 5 — Transmission ground:
(T10) No. 4 — Transmission ground:
(T10) No. 3 — Transmission ground:
(T10) No. 2 — Transmission ground:

Is the resistance more than 1 
M

Ω?

Go to step 10.

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

10

CHECK POOR CONTACT.

Is there any poor contact in 
inhibitor SW 1 — 4 or inhibitor 
SW 3 monitor circuit?

Repair the poor 
contact.

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

Step

Check

Yes

No