Subaru Legacy (2005 year). Service manual — part 636

5AT(diag)-135

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

C: CHECK BUZZER

DIAGNOSIS:
Output signal circuit of buzzer is open or shorted.
TROUBLE SYMPTOM:
Buzzer remains beeping.
WIRING DIAGRAM:

3

4

21

22

AT-03178

1

7

i77

i10

i84

A:

B280

B:

2

8

A26

A27

B20

B30

4

3

TCM

B54

i10

i77

i84

B280

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

E

B

A

TTER

Y

IGNITION
SWITCH

JOINT
CONNECTOR

BODY INTEGRATED MODULE

COMBINATION
METER

SPORT
SHIFT
BUZZER

A:

B:

B54

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

No.5

5AT(diag)-136

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

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

Is DTC of AT CAN communica-
tion circuit displayed?

Perform the diag-
nosis according to
DTC.

Go to step 2.

2

CHECK TCM.
Check DTC of TCM.

Is DTC of AT CAN communica-
tion circuit displayed?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK BUZZER STOP.
Disconnect the connector (B54).

Does the buzzer stop?

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

Go to step 4.

4

CHECK BODY INTEGRATED MODULE.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON. (engine
OFF)
4) Turn the Subaru Select Monitor power
switch to ON.
5) Read the data of SPORT shift buzzer using
Subaru Select Monitor.

Is the SPORT shift buzzer dis-
play “ON”?

Replace the body
integrated mod-
ule. <Ref. to SL-
44, Body Inte-
grated Module.>

Go to step 5.

5

CHECK COMBINATION METER.

Is the buzzer OK?

Refer to “General
Diagnostic Table”.
<Ref. to 5AT(diag)-
137, General Diag-
nostic Table.>

Replace the com-
bination meter
assembly. <Ref. to
IDI-15, Combina-
tion Meter.>

5AT(diag)-137

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

General Diagnostic Table

16.General Diagnostic Table

A: INSPECTION

Symptom

Problem parts

Shifting vehicle speed is low on “D” range.

• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Accelerator pedal position sensor
• Throttle position sensor
• ATF temperature sensor
• CAN communication signal

Shifting vehicle speed is high on “D” range.

• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Accelerator pedal position sensor
• Throttle position sensor
• CAN communication signal
• Brake switch signal
• Lateral G sensor
• ATF temperature sensor

Excessive shock. (“N”

→“D” range)

• Engine idle speed
• Engine speed signal
• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• ATF temperature sensor
• Oil pressure switch 1 and Front brake solenoid valve
• CAN communication signal
• Fluid level and condition
• TCM power supply
• PVIGN relay

Excessive shift shock on 1st of “D” range

→ 2nd of “D” range or

“1st of manual mode”

→ “2nd of manual mode”.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• Oil pressure switch 4 and Direct clutch solenoid valve
• CAN communication signal
• Engine speed signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

Excessive shift shock on 2nd of “D” range

→ 3rd of “D” range or

“2nd of manual mode”

→ “3rd of manual mode”.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• Oil pressure switch 5 and High & low reverse clutch solenoid
valve
• CAN communication signal
• Engine speed signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

Excessive shift shock on 3rd of “D” range

→ 4th of “D” range or

“3rd of manual mode”

→ “4th of manual mode”.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• Oil pressure switch 3 and Input clutch solenoid valve
• CAN communication signal
• Engine speed signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

5AT(diag)-138

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

General Diagnostic Table

Excessive shift shock on 4th of “D” range

→ 5th of “D” range or

“4th of manual mode”

→ “5th of manual mode”.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• Oil pressure switch 1 and Front brake solenoid valve
• CAN communication signal
• Engine speed signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

Excessive shock at kick down.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• CAN communication signal
• Engine speed signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

Excessive shock at shift up.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• Engine speed signal
• CAN communication signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

Excessive shock at lock up.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• Engine speed signal
• CAN communication signal
• Torque converter turbine speed sensor
• Lock up solenoid valve
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Fluid level and condition

Excessive shock at engine brake.

• Accelerator pedal position sensor
• Throttle position sensor
• Control cable adjustment
• CAN communication signal
• Fluid level and condition
• Line pressure
• Low coast brake solenoid valve

Judder is occurred at lock up.

• Fluid level and condition
• Engine speed signal
• Torque converter turbine speed sensor
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Accelerator pedal position sensor
• Throttle position sensor
• Lock up solenoid valve
• ATF temperature sensor 1 and 2

Noise at “R”, “N” and “D” range.

• Fluid level and condition
• Engine speed signal
• ATF temperature sensor 1 and 2

Hold at “D” range or 1st on manual mode.

• Fluid level and condition
• Vehicle speed sensor 1 and Vehicle speed sensor 2
• Direct clutch solenoid valve
• Line pressure
• Up switch signal
• CAN communication signal
• Accelerator pedal position sensor

Symptom

Problem parts