Subaru Legacy III (2000-2003 year). Manual — part 803

VDC-248

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

7

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

chassis ground.

Connector & terminal

(F87) No. 66 (

++++

) — Chassis ground (

−−−−

):

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

0.5 V

Go to step 8.

Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.

8

CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Install yaw rate and lateral G sensor to

body.

3) Remove VDCCM connector cover. <Ref. to

VDC-19, VDCCM Connector Cover.>

4) Connect all connectors.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM connec-

tor terminals.

Connector & terminal

(F87) No. 66 (+) — No. 64 (

−−−−

):

Is the measured value within the specified
range?

2.1 — 2.9 V

Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>

Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sensor.>

Step

Value

Yes

No

VDC-249

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

MEMO:

VDC-250

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

AW:DTC 72 CHANGE RANGE OF YAW RATE SENSOR SIGNAL IS TOO BIG.

DIAGNOSIS:
• Faulty yaw rate sensor
TROUBLE SYMPTOM:
• VDC does not operate.
WIRING DIAGRAM:

VDC00182

65

63

67

66

70

64

10

11

9

F88

F55

R49

4

3

12

2

4

5

8

1

5

6

R100

6

F88

R100

F55

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

F87

VDC

CONTROL

MODULE

YAW RATE

AND LATERAL G

SENSOR

1

3

4 5 6

2

1 2 3

4 5

6 7 8 9 10 11 12

3

1

3

4 5 6

2

VDC-251

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

Step

Value

Yes

No

1

CHECK RUNNING FIELD.
Was the vehicle driven on surfaces with holes
or bumps at high speeds?

Driven.

When driving on
surfaces with
holes or bumps at
high speeds,
VDCCM some-
times records trou-
ble codes in
memory.

Go to step 2.

2

CHECK INSTALLATION OF YAW RATE AND
LATERAL G SENSOR.
Check installation of yaw rate and lateral G
sensor.
Is the yaw rate and lateral G sensor fixed
securely?

Fixed securely.

Go to step 3.

Install yaw rate
and lateral G sen-
sor securely.

3

CHECK POWER SUPPLY OF YAW RATE
AND LATERAL G SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from yaw rate and

lateral G sensor.

3) Turn ignition switch to ON.
4) Measure voltage between yaw rate and lat-

eral G sensor and chassis ground.

Connector & terminal

(R100) No. 3 (

++++

) — Chassis ground (

−−−−

):

Is the measured value within the specified
range?

10 — 15 V

Go to step 6.

Go to step 4.

4

CHECK OUTPUT VOLTAGE OF VDCCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Remove cover for VDCCM connector.

<Ref. to VDC-19, REMOVE, VDCCM Con-
nector Cover.>

4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM and

chassis ground.

Connector & terminal

(F87) No. 63 (

++++

) — Chassis ground (

−−−−

):

Is the measured value within the specified
range?

10 — 15 V

Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.

Go to step 5.

5

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in yaw rate and lateral G
sensor connector?

There is poor contact.

Repair or replace
VDCCM connec-
tor.

Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>

6

CHECK GROUND CIRCUIT OF YAW RATE
AND LATERAL G SENSOR.
Measure resistance between yaw rate and lat-
eral G sensor and chassis ground.

Connector & terminal

(R100) No. 6 — Chassis ground:

Is the measured value less than the specified
value?

0.5

Ω

Go to step 9.

Go to step 7.