Subaru Legacy III (2000-2003 year). Manual — part 579

AT-50

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

6

CHECK ATF TEMPERATURE SENSOR.
1) Turn ignition switch to ON (engine OFF).
2) Measure resistance between transmission

connector terminals.

Connector & terminal

(T4) No. 11 — No. 12:

Does the resistance value increase while
the ATF temperature decreases?

Resistance value increases.

Go to step 7.

Replace ATF sen-
sor.

7

PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?

Subaru Select Monitor is avail-
able.

Go to step 9.

Go to step 8.

8

CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to transmission.
2) Warm-up the transmission until ATF tem-

perature is about 80

°

C (176

°

F).

NOTE:

If ambient temperature is below 0

°

C (32

°

F),

drive the vehicle until the ATF reaches its oper-
ating temperature.

3) Measure voltage between TCM connector

terminal.

Connector & terminal

(B54) No. 11 (+) — No. 20 (

−−−−

):

Is the measured value within the specified
range?

0.4 — 0.9 V

Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. Tempo-
rary poor contact
of the connector or
harness may be
the case. Repair
harness or con-
tact in the ATF
temperature sen-
sor and transmis-
sion connector.

Go to step 10.

9

CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connector to transmission.
2) Turn ignition switch to ON (engine OFF).

Does the ATF temperature gradually
decrease?

ATF temperature gradually
increases.

Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. Tempo-
rary poor contact
of the connector or
harness may be
the case. Repair
harness or con-
tact in the ATF
temperature sen-
sor and transmis-
sion connector.

Go to step 10.

10

CHECK POOR CONTACT.
Is there poor contact in ATF temperature sen-
sor circuit?

There is poor contact.

Repair poor con-
tact.

Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>

Step

Value

Yes

No

AT-51

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

AT-52

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

D: DTC 31 THROTTLE POSITION SENSOR

DIAGNOSIS:
Input signal circuit of throttle position sensor is open or shorted.
TROUBLE SYMPTOM:
Shift point too high or too low; excessive shift shock; excessive tight corner “braking”.
WIRING DIAGRAM:
EXCEPT 3.0 L MODEL

AT-00777

NT

TB

THROTTLE

POSITION SENSOR

SHIELD AND

SENSOR GROUND

JOINT CONNECTOR

E13

NT

TB

B21

E2

B54

B122

TB

:

B83

B22

E3

C17

C15

C16

A8

A22

A27

A7

15

13

8

A7

C21

C22

B6

00L

C17

C15

C16

A8

A27

A7

C21

C22

00R

B13

B3

B19

A7

C26

A35

C5

C16

B21

D14

WO

2

3

4

3

2

TCM

16

NT

TB

14

B54

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

B21

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

B22

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

E13

1 2 3

1 2 3 4

1 2 3 4 5 6 7 8 9 10 11 12

B83

EG

:

E13

NT

:

B83

B134

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

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

B135

B134

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

5

4

6 7

8

2

1

9

3

10

22

23

11 12 13 14 15

24 25

26 27

16 17 18

28

29

19 20

21

30

B136

B137

D:

B84

E:

B134

A:

B135

B:

ECM

B136

C:

: WITH OBD EXCEPT FOR
G.C.C COUNTRIES AND
LATIN AMERICA MODEL

: NON-TURBO MODEL

EG

: WITH OBD G.C.C
COUNTRIES AND LATIN
AMERICA MODEL

FG

NT

: TURBO MODEL

TB

: WITH OBD MODEL

: WITHOUT OBD RHD MODEL

WO

: WITHOUT OBD MODEL

OO

00R

: WITHOUT OBD LHD MODEL

00L

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

B135

OO

4

6

EG

3

4

OO

:

: TB

12

11

9

20

19

18

1

3

2

FG

OO

EG

:

TB

1

6

FG

2

1

,

15

13

3

16

14

B7

B9

B19

C17

C18

C8

D8

D9

A15

A12

E1

TB

00R

00L

E: B84

B: B135

D: B137

C: B136

A: B134

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

1

2

7

8

9

5

6

3

4

10 11 12

19 20 21
29 30 31

13 14 15 16 17

27 28

18

22 23 24 25 26

5 6

7

2

1

9

8

4

3

22

20

23

21

24

10 11 12 13 14

25 26

15 16 17

18 19

B136

WO

TB

B137

1 2

3 4

9

8

7

6

5

10 11 12 13

14 15

16 17 18

19 20

1 2

7

8 9

5

6

3

4

10 11 12
19 20 21

13 14 15 16

17 18

22 23 24

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

5 6

7 8

2

1

9

4

3

10 11 12

13 14 15

16 17

1 2 3 4 5 6

B122

B83

FG

:

AT-53

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

3.0 L MODEL

THROTTLE

POSITION SENSOR

E13

B20

E1

B83

B252

E49

B7

B9

B19

D21

D31

D8

D9

C18

A22

5

1

2

3

6

7

C8

C17

2

3

16

15

13

3

2

1

8

5

14

15

13

ECM

B136

C:

B137

D:

B134

A:

B135

B:

TCM

B54

B54

B20

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B136

1 2

7

8 9

5

6

3

4

10 11 12
19 20 21

13 14 15 16

17 18

22 23 24

B137

1

2

7

8

9

5

6

3

4

10 11 12

19 20 21
29 30 31

13 14 15 16 17

27 28

18

22 23 24 25 26

E13

1 2 3

B252

B83

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

1 2 3 4
5 6 7 8

SHIELD AND

SENSOR GROUND

JOINT CONNECTOR

A15

A7

B134

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

B135

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

AT-00778

1 2 3 4

5 6 7 8 9 10

11 12

19

20

13 14 15 16 17 18