Subaru Legacy III (2000-2003 year). Manual - part 763

VDC-88

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

6

CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and 

chassis ground.

Connector & terminal

(F87) No. 63 (+) — Chassis ground (

−−−−

) 

(Lateral G sensor):
(F87) No. 78 (+) — Chassis ground (

−−−−

) 

(Pressure sensor):

Is the measured value less than the speci-
fied value?

0.5 V

Replace faulty 
sensor.

Repair or replace 
harness connec-
tor between 
VDCCM and faulty 
sensor.

Step

Value

Yes

No

VDC-89

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

MEMO:

VDC-90

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

AG:DTC 47 FAULTY CAN COMMUNICATION LINE

DIAGNOSIS:
• CAN communication line is broken or short circuited.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:

VDC00178

B234

STEERING ANGLE SENSOR

9

18

4

2

1

3

2
3
1
5
6
4

81

27

83

1

15

R

2

5

9

L

6

B231

VDC

CONTROL

MODULE

F96

B225

F87

B56

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

B231

1 2 3 4

B234

1 2 3 4 5 6

F87

56 57

59 60

62 63

65

82 83

80

27

28

25

26

23

24

21

22

19

20

17

18

15

16

13

14

11

12

9

10

7

8

5

6

3

4

1

2

54

55

52

53

50

51

81

48

49

46

47

44

45

78

79

76

77

75

42

43

40

41

74

72

73

70

71

39

37

38

35

36

69

67

68

66

33

34

61

64

31

32

29

30

58

B56

TCM

1 2 3

4 5 6

7 8 9 10 11 12 13 14

F96

L

:

F96

R

:

R

L

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

: RHD MODEL

: LHD MODEL

VDC-91

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

Step

Value

Yes

No

1

CHECK HARNESS BETWEEN VDCCM, 
STEERING ANGLE SENSOR AND TCM.
1) Turn ignition switch OFF.
2) Disconnect connector from VDCCM, TCM 

and steering angle sensor.

3) Measure resistance between VDCCM, 

TCM and steering angle sensor.

Connector & terminal

(F87) No. 83 — (B56) No. 9:
(F87) No. 81 — (B56) No. 18:
(F87) No. 83 — (B231) No. 2:
(F87) No. 81 — (B231) No. 1:

Is the measured value less than the speci-
fied value?

0.5 

Ω

Go to step 3.

Go to step 2.

2

CHECK HARNESS BETWEEN STEERING 
ANGLE SENSOR AND TCM.
Measure resistance between TCM and steer-
ing angle sensor.

Connector & terminal

(B56) No. 9 — (B231) No. 2:
(B56) No. 18 — (B231) No. 1:

Is the measured value less than the specified 
value?

0.5 

Ω

Repair or replace 
harness connec-
tor between 
VDCCM and 
steering angle 
sensor.

Repair or replace 
harness connec-
tor between TCM 
and steering angle 
sensor.

3

CHECK GROUND SHORT OF HARNESS.
Measure resistance between VDCCM and 
chassis ground.

Connector & terminal

(F87) No. 83 — Chassis ground:
(F87) No. 81 — Chassis ground:

Does the measured value exceed the specified 
value?

1 M

Ω

Go to step 4.

Repair or replace 
harness connec-
tor between 
VDCCM, TCM and 
steering angle 
sensor.

4

CHECK BATTERY SHORT OF SENSOR.
Measure voltage between VDCCM and chas-
sis ground.

Connector & terminal

(F87) No. 83 — Chassis ground:
(F87) No. 81 — Chassis ground:

Is the measured value less than the specified 
value?

0.5 V

Go to step 5.

Repair or replace 
harness connec-
tor between 
VDCCM, TCM and 
steering angle 
sensor.

5

CHECK BATTERY SHORT OF SENSOR.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and 

chassis ground.

Connector & terminal

(F87) No. 83 — Chassis ground:
(F87) No. 81 — Chassis ground:

Is the measured value less than the speci-
fied value?

0.5 V

Go to step 6.

Repair or replace 
harness connec-
tor between 
VDCCM, TCM and 
steering angle 
sensor.

6

CHECK STEERING ANGLE SENSOR.
1) Turn ignition switch to OFF.
2) Connect connector to steering angle sen-

sor.

3) Measure resistance between VDCCM con-

nector terminals.

Connector & terminal

(F87) No. 83 — No. 81:

Is the measured value within the specified 
range?

114 — 126 

Ω

Go to step 8.

Go to step 7.