Subaru Legacy (2005 year). 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