Subaru Legacy III (2000-2003 year). Service manual — part 787

VDC-184

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

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-185

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

MEMO:

VDC-186

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

AF:DTC 47 IMPROPER CAN COMMUNICATION

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-187

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

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.