Subaru Legacy (2005 year). Service manual - part 572

4AT(diag)-125

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK SPORT SHIFT SWITCH.
1) Shift the select lever to manual mode.
2) Shift and hold the select lever to up side.
3) Read the Up Switch data of TCM using 
Subaru Select Monitor. <Ref. to 4AT(diag)-16, 
READ CURRENT DATA, OPERATION, Subaru 
Select Monitor.>

Is ON displayed?

Go to step 2.

Go to step 3.

2

CHECK MANUAL MODE SWITCH.
1) Shift and hold the select lever to down side.
2) Read the Down Switch data of TCM using 
Subaru Select Monitor. <Ref. to 4AT(diag)-16, 
READ CURRENT DATA, OPERATION, Subaru 
Select Monitor.>

Is ON displayed?

Go to “CHECK 
SPORT INDICA-
TOR” procedures. 
<Ref. to 4AT(diag)-
128, CHECK 
SPORT INDICA-
TOR., Diagnostic 
Procedure without 
Diagnostic Trou-
ble Code (DTC).>

Go to step 12.

3

CHECK BODY INTEGRATED MODULE.
1) Turn the ignition switch to ON.
2) Shift and hold the select lever to up side.
3) Read the TIP UP SW data of body inte-
grated module using Subaru Select Monitor. 
<Ref. to LAN(diag)-14, OPERATION, Subaru 
Select Monitor.>

Is ON displayed?

Go to step 4.

Go to step 5.

4

CHECK BODY INTEGRATED MODULE.
Check DTC of body integrated module. <Ref. 
to LAN(diag)-14, OPERATION, Subaru Select 
Monitor.>

Is DTC of CAN communication 
displayed?

Perform the diag-
nosis according to 
DTC.

Check the TCM.

5

CHECK MANUAL MODE SWITCH GROUND 
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from manual 
mode switch.
3) Measure the resistance of harness 
between manual mode switch connector and 
chassis ground.

Connector & terminal

(B116) No. 6 — Chassis ground:

Is the resistance less than 1 
Ω?

Go to step 6.

Repair the open 
circuit of harness 
between manual 
mode switch and 
chassis ground.

6

CHECK MANUAL MODE SWITCH.
Measure the resistance between manual mode 
switch terminals.

Connector & terminal

(B116) No. 6 — No. 5:

Is the resistance more than 1 
M

Ω?

Go to step 7.

Replace the guide 
plate assembly.

7

CHECK MANUAL MODE SWITCH.
1) Shift and hold the select lever to up side.
2) Measure the resistance between manual 
mode switch terminals.

Connector & terminal

(B116) No. 6 — No. 5:

Is the resistance less than 1 
Ω?

Go to step 8.

Replace the guide 
plate assembly.

8

CHECK HARNESS CONNECTOR BETWEEN 
BODY INTEGRATED MODULE AND MANU-
AL MODE SWITCH.
1) Disconnect the connector from body inte-
grated module.
2) Measure the resistance of harness 
between body integrated module connector 
and manual mode switch connector.

Connector & terminal

(B116) No. 5 — (B281) No. 15:

Is the resistance less than 1 
Ω?

Go to step 9.

Repair the open 
circuit of harness 
between manual 
mode switch con-
nector and TCM 
connector, or poor 
contact in connec-
tor.

4AT(diag)-126

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

9

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND MANUAL MODE SWITCH.
Measure the resistance of harness between 
manual mode switch connector and chassis 
ground.

Connector & terminal

(B116) No. 5 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 10.

Repair the short 
circuit of harness 
between manual 
mode switch con-
nector and TCM 
connector.

10

CHECK INPUT SIGNAL TO BODY INTE-
GRATED MODULE.
1) Connect all the connectors.
2) Turn the ignition switch to ON (engine 
OFF).
3) Check the signal voltage for body inte-
grated module.

Connector & terminal

(B281) No. 15 (+) — Chassis ground (

−

):

Is the voltage 1.5 — 8 V?

Go to step 11.

Replace the body 
integrated module.

11

CHECK INPUT SIGNAL TO BODY INTE-
GRATED MODULE.
1) Shift and hold the select lever to up side.
2) Check the signal voltage for body inte-
grated module.

Connector & terminal

(B281) No. 15 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 19.

Replace the body 
integrated module.

12

CHECK BODY INTEGRATED MODULE.
1) Turn the ignition switch to ON.
2) Shift and hold the select lever to down side.
3) Read the TIP UP SW data of body inte-
grated module using Subaru Select Monitor. 
<Ref. to LAN(diag)-14, OPERATION, Subaru 
Select Monitor.>

Is ON displayed?

Go to step 13.

Go to step 14.

13

CHECK BODY INTEGRATED MODULE.
Check DTC of body integrated module.

Is DTC of CAN communication 
displayed?

Perform the diag-
nosis according to 
DTC.

Check the TCM.

14

CHECK MANUAL MODE SWITCH GROUND 
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from manual 
mode switch.
3) Measure the resistance of harness 
between manual mode switch connector and 
chassis ground.

Connector & terminal

(B116) No. 10 (+) — Chassis ground:

Is the resistance less than 1 
Ω?

Go to step 15.

Repair the open 
circuit of harness 
between manual 
mode switch and 
chassis ground.

15

CHECK MANUAL MODE SWITCH.
Measure the resistance between manual mode 
switch terminals.

Connector & terminal

(B116) No. 10 — No. 9:

Is the resistance more than 1 
M

Ω?

Go to step 16.

Replace the guide 
plate assembly.

16

CHECK MANUAL MODE SWITCH.
1) Shift and hold the select lever to down side.
2) Measure the resistance between manual 
mode switch terminals.

Connector & terminal

(B116) No. 10 — No. 9:

Is the resistance less than 1 
Ω?

Go to step 17.

Replace the guide 
plate assembly.

Step

Check

Yes

No

4AT(diag)-127

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

17

CHECK HARNESS CONNECTOR BETWEEN 
BODY INTEGRATED MODULE AND MANU-
AL MODE SWITCH.
1) Disconnect the connector from body inte-
grated module.
2) Measure the resistance of harness 
between body integrated module connector 
and manual mode switch connector.

Connector & terminal

(B116) No. 9 — (B281) No. 25:

Is the resistance less than 1 
Ω?

Go to step 18.

Repair the open 
circuit of harness 
between manual 
mode switch con-
nector and TCM 
connector, or poor 
contact in connec-
tor.

18

CHECK HARNESS CONNECTOR BETWEEN 
BODY INTEGRATED MODULE AND MANU-
AL MODE SWITCH.
Measure the resistance of harness between 
manual mode switch connector and chassis 
ground.

Connector & terminal

(B116) No. 9 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 19.

Repair the short 
circuit of harness 
between manual 
mode switch con-
nector and TCM 
connector.

19

CHECK INPUT SIGNAL TO BODY INTE-
GRATED MODULE.
1) Connect all the connectors.
2) Turn the ignition switch to ON (engine 
OFF).
3) Check the signal voltage for body inte-
grated module.

Connector & terminal

(B281) No. 25 (+) — Chassis ground (

−

):

Is the voltage 1.5 — 8 V?

Go to step 20.

Go to step 21.

20

CHECK INPUT SIGNAL TO BODY INTE-
GRATED MODULE.
1) Shift and hold the select lever to down side.
2) Check the signal voltage for body inte-
grated module.

Connector & terminal

(B281) No. 25 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 21.

Replace the body 
integrated mod-
ule. <Ref. to 4AT-
66, Transmission 
Control Module 
(TCM).>

21

CHECK POOR CONTACT.

Is there poor contact in manual 
mode switch circuit?

Repair the poor 
contact.

A temporary poor 
contact of manual 
mode switch circuit 
connector or har-
ness

Step

Check

Yes

No

4AT(diag)-128

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

C: CHECK SPORT INDICATOR.

DIAGNOSIS:
Output signal circuit of SPORT indicator is open or shorted.
TROUBLE SYMPTOM:
• SPORT indicator does not display or remains displayed.
• SPORT indicator display does not change.
WIRING DIAGRAM:
• LHD model

AT-03168

3

4

21

1

22

7

i10

i77

2

8

A27

A26

B20

B30

i84

A:

B280

B:

3

12

TCM

B54

i10

i77

i84

B280

B54

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

8

3

4

5

6

7

2

1

18 19 20

17

16

15

14

13

12

11

10

9

24

23

22

21

E

COMBINATION
METER

SPORT
INDICATOR

JOINT
CONNECTOR

BODY INTEGRATED MODULE

IGNITION

SWITCH

B

A

TTER

Y

A:

B:

2

4

5

7

B352

JOINT
CONNECTOR

B355

JOINT
CONNECTOR

B352

B355

1 2 3 4
5 6 7 8

2

*

2

*

1

*

1

*

No.12

SBF-6

MAIN SBF

1

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 1,2,5, AND 6

2

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 3,4,7, AND 8