Subaru Legacy IV (2008 year). Service manual - part 749

5AT(diag)-11

Electrical Component Location

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

(1)

AT-00375

AT-03281

(2)

AT-04264

(3)

AT-03282

(4)

(5)

AT-04265

(6)

AT-04266

(7)

5AT(diag)-12

Electrical Component Location

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

3. SOLENOID

(1)

High & low reverse clutch linear 
solenoid

(3)

Front brake linear solenoid

(6)

Lock-up pressure linear solenoid

(4)

Input clutch linear solenoid

(7)

Transfer linear solenoid

(2)

Direct clutch linear solenoid

(5)

Line pressure linear solenoid

(8)

Forward brake linear solenoid

AT-04871

(3)

(5)

(6)

(4)

(1)

(2)

(8)

(7)

5AT(diag)-13

Electrical Component Location

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

4. OIL PRESSURE SWITCH

(1)

Front brake oil pressure switch

(3)

High & low reverse clutch oil pres-
sure switch

(4)

Direct clutch oil pressure switch

(2)

Input clutch oil pressure switch

(5)

Forward brake oil pressure switch

AT-04872

(3)

(5)

(4)

(1)

(2)

5AT(diag)-14

Transmission Control Module (TCM) I/O Signal

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

5. Transmission Control Module (TCM) I/O Signal

A: ELECTRICAL SPECIFICATION

NOTE:
The measurement should be performed after warming up.

Item

Connector 

No.

Terminal 

No.

Measuring condition

Measured value

Resistance 

between terminal 

and chassis 

ground

Remarks

P/L solenoid output

B54

6

Engine ON, “P” range, 
accelerator OFF, 
brake ON

3.5 — 7.5 V

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

I/C oil pressure 
switch input

B54

20

While driving at 1st-3rd 
of manual mode

6 V or more

While driving at 4th or 
5th of manual mode

Less than 1.5 V

Power GND

B54

12

Always

Approx. 0 V

 — 

 

CAN communication 
line (+)

B55

21

 — 

 — 

 — 

CAN communication 
line (–)

B55

20

 — 

 — 

 — 

ATF temperature 
sensor 1 input

B54

17

Ignition switch ON
ATF oil temperature 
20°C (68°F)

3.5 — 4.3 V

2.5 — 7.0 k

:

When measur-
ing the resis-
tance, be sure to 
disconnect the 
connector and 
perform the 
measurement 
with TCM alone.

Ignition switch ON
ATF oil temperature 
80°C (176°F)

1 — 2.2 V

0.3 — 0.8 k

:

Backup power 
supply

B55

24

Ignition switch ON

8 V or more

 — 

Ignition switch OFF

I/C solenoid output

B54

3

While driving at 1st-3rd 
of manual mode

5 V or more

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

While driving at 4th or 
5th of manual mode

Less than 1.5 V

5

6

7

8

2

1

9

4

3

10

24

22

23

25

11

12

13

14

15

26

27

28

16

17

18

19

20

21
29

30

31

32

33

34

35

B55

TO

TO

5

6

7

8

2

1

9

4

3

10

24

22

23

25

11

12

13

14

15
26

27

28

16

17

18

19

20

21

33

34

29

32

30

31

35

B54

AT-03733