Subaru Legacy III (2000-2003 year). Manual — part 770

VDC-116

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

7

CHECK HARNESS OF STEERING ANGLE
SENSOR.
1) Connect connector to steering angle sen-

sor.

2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-

nector terminals.

Connector & terminal

(F87) No. 81 — No. 83:

Is the measured value within the specified
range?

114 — 126

Ω

Repair harness
between steering
angle sensor and
VDCCM.

Go to step 8.

8

CHECK STEERING ANGLE SENSOR.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the diagnostic trouble code.

Is the same diagnostic trouble code as in
the current diagnosis still being output?

Same DTC indicated.

Go to step 10.

Go to step 9.

9

CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?

Other DTC indicated.

Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.

A temporary poor
contact.

10

CHECK VDCCM.
1) Turn ignition switch to OFF.
2) Replace steering angle sensor.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the diagnostic trouble code.

Is the same diagnostic trouble code as in
the current diagnosis still being output?

Same DTC indicated.

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

Go to step 11.

11

CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?

Other DTC indicated.

Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.

The original steer-
ing angle sensor
has been faulty.

Step

Value

Yes

No

VDC-117

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

MEMO:

VDC-118

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

AM:DTC 72 ABNORMAL YAW RATE SENSOR

DIAGNOSIS:
• Faulty yaw rate sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• 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-119

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

Step

Value

Yes

No

1

CHECK THE STEERING WHEEL.
1) Drive the vehicle on a flat road.
2) Stop the vehicle in a straight line.
3) Check the angle of steering wheel.

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

5

°

Go to step 2.

Perform centering
alignment of steer-
ing.

2

CHECK RUNNING FIELD.
Was the vehicle driven on banked road sur-
faces or sandy surfaces (not dirt road sur-
faces) or surfaces with holes or bumps at high
speeds?

Driven

Driving on banked
road surfaces or
sandy surfaces
(not dirt road sur-
faces) or surfaces
with holes or
bumps at high
speeds, some-
times results in a
VDCCM memory
trouble code.

Go to step 3.

3

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 4.

Install yaw rate
and lateral G sen-
sor securely.

4

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 7.

Go to step 5.

5

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 connec-

tor 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 6.

6

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).>