Subaru Legacy III (2000-2003 year). Manual — part 805

VDC-256

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

BA:DTC 73 EXCESSIVE LATERAL G SENSOR SIGNAL

DIAGNOSIS:
• Faulty lateral G 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-257

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

Step

Value

Yes

No

1

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 2.

Install yaw rate
and lateral G sen-
sor securely.

2

CHECK OUTPUT OF LATERAL G SENSOR
USING SELECT MONITOR.
1) Stop the vehicle on a flat road.
2) Select “Current data display & Save” on the

select monitor.

3) Read yaw rate and lateral G sensor output

on the select monitor display.
Is the measured value within the specified
range?

2.3 — 2.7 V

Go to step 3.

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

3

CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connector between
VDCCM and yaw rate and lateral G sensor?

There is poor contact.

Repair connector.

Go to step 4.

4

CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) 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 5.

5

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.

VDC-258

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

BB:DTC 73 VOLTAGE INPUTTED TO LATERAL G SENSOR EXCEEDS SPECIFI-

CATION.

DIAGNOSIS:
• Faulty lateral G 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-259

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

Step

Value

Yes

No

1

CHECK OUTPUT OF YAW RATE AND LAT-
ERAL G SENSOR USING SELECT MONI-
TOR.
1) Stop the vehicle on a flat road.
2) Select “Current data display & Save” on the

select monitor.

3) Read yaw rate and lateral G sensor output

on the select monitor display.
Is the measured value within the specified
range?

2.3 — 2.7 V

Go to step 2.

Go to step 5.

2

CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connector between
VDCCM and yaw rate and lateral G sensor?

There is poor contact.

Repair connector.

Go to step 3.

3

CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) 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 4.

4

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.

5

CHECK INPUT VOLTAGE OF YAW RATE
AND LATERAL G SENSOR.
1) Turn ignition switch to OFF.
2) Remove console box.
3) Disconnect connector from yaw rate and

lateral G sensor.

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

eral G sensor connector terminals.

Connector & terminal

(R100) No. 3 (+) — No. 6 (

−−−−

):

Is the measured value within the specified
range?

10 — 15 V

Go to step 6.

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

6

CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Measure resistance between yaw rate and

lateral G sensor terminals.

Terminals

No. 3 — No. 5:

Is the measured value within the specified
range?

4.3 — 4.9 k

Ω

Go to step 7.

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