Subaru Legacy III (2000-2003 year). Service manual — part 749

VDC-32

VDC (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

If any of the following multiple diagnostic trouble codes (DTCs) are present in memory, check the area cor-
responding to the first diagnostic trouble code (DTC). If no problem is detected, check the areas correspond-
ing to the other diagnostic trouble codes (DTCs) in order of their appearance.

73

Lateral G sensor offset
is too big.

Lateral G sensor offset
is too big.

<Ref. to VDC-254, DTC 73 LATERAL G SENSOR OFFSET IS
TOO BIG., Diagnostics Chart with Select Monitor.>

73

Abnormal lateral G sen-
sor output

Abnormal lateral G sen-
sor output

<Ref. to VDC-254, DTC 73 ABNORMAL LATERAL G SENSOR
OUTPUT, Diagnostics Chart with Select Monitor.>

73

Change range of lateral
G sensor is too big.

Change range of lat-
eral G sensor is too big.

<Ref. to VDC-254, DTC 73 CHANGE RANGE OF LATERAL G
SENSOR IS TOO BIG., Diagnostics Chart with Select Monitor.>

73

Excessive lateral G sen-
sor signal

Excessive lateral G
sensor signal

<Ref. to VDC-256, DTC 73 EXCESSIVE LATERAL G SENSOR
SIGNAL, Diagnostics Chart with Select Monitor.>

73

Voltage inputted to lat-
eral G sensor exceeds
specification.

Voltage inputted to lat-
eral G sensor exceeds
specification.

<Ref. to VDC-258, DTC 73 VOLTAGE INPUTTED TO LAT-
ERAL G SENSOR EXCEEDS SPECIFICATION., Diagnostics
Chart with Select Monitor.>

74

Voltage inputted to
pressure sensor 1
exceeds specification.

Voltage inputted to pri-
mary pressure sensor
exceeds specification.

<Ref. to VDC-262, DTC 74 VOLTAGE INPUTTED TO PRES-
SURE SENSOR 1 EXCEEDS SPECIFICATION. (PRIMARY
PRESSURE SENSOR), Diagnostics Chart with Select Moni-
tor.>

74

Voltage inputted to
pressure sensor 2
exceeds specification.

Voltage inputted to sec-
ondary pressure sen-
sor exceeds
specification.

<Ref. to VDC-266, DTC 74 VOLTAGE INPUTTED TO PRES-
SURE SENSOR 2 EXCEEDS SPECIFICATION. (SECOND-
ARY PRESSURE SENSOR), Diagnostics Chart with Select
Monitor.>

74

Pressure sensor 1 off-
set is too big.

Primary pressure sen-
sor offset is too big.

<Ref. to VDC-269, DTC 74 PRESSURE SENSOR 1 OFFSET
IS TOO BIG. (PRIMARY PRESSURE SENSOR), Diagnostics
Chart with Select Monitor.>

74

Pressure sensor 2 off-
set is too big.

Secondary pressure
sensor offset is too big.

<Ref. to VDC-270, DTC 74 PRESSURE SENSOR 2 OFFSET
IS TOO BIG. (SECONDARY PRESSURE SENSOR), Diagnos-
tics Chart with Select Monitor.>

74

Differential pressure of
pressure sensor is too
big.

Differential pressure of
pressure sensor is too
big.

<Ref. to VDC-272, DTC 74 DIFFERENTIAL PRESSURE OF
PRESSURE SENSOR IS TOO BIG., Diagnostics Chart with
Select Monitor.>

Combination of DTC No.

Problem area

Index No.

46 Abnormal voltage of 5 V power supply
74 Voltage inputted to pressure sensor 2
exceeds specification.

(F87) — No. 78, 68 or 69 lead circuit
is shorted to ground or battery.

<Ref. to VDC-182, DTC 46 ABNORMAL
VOLTAGE OF 5 V POWER SUPPLY,
Diagnostics Chart with Select Monitor.>

44 TCM communication circuit
71 No signal from steering angle sensor

(F87) — No. 83 or 81 lead circuit is
open.

<Ref. to VDC-234, DTC 71 NO SIGNAL
FROM STEERING ANGLE SENSOR,
Diagnostics Chart with Select Monitor.>

51 Valve relay
48 Improper EAC communication
71 No signal from steering angle sensor

(F87) — No. 27 lead circuit is open.

<Ref. to VDC-234, DTC 71 NO SIGNAL
FROM STEERING ANGLE SENSOR,
Diagnostics Chart with Select Monitor.>

71 No signal from steering angle sensor
51 Valve relay
44 TCM communication circuit

(F87) — No. 27 lead circuit is open.

<Ref. to VDC-234, DTC 71 NO SIGNAL
FROM STEERING ANGLE SENSOR,
Diagnostics Chart with Select Monitor.>

73 Voltage inputted to lateral G sensor
exceeds specification.
72 Voltage inputted to yaw rate sensor
exceeds specifications.

(F87) — No. 23 lead circuit is open.

<Ref. to VDC-256, DTC 73 EXCESSIVE
LATERAL G SENSOR SIGNAL, Diagnos-
tics Chart with Select Monitor.>

DTC No.

Display screen

Contents of diagnosis

Index No.

VDC-33

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

13.Diagnostics Chart with Diagnosis Connector

A: ABS WARNING LIGHT, VDC WARNING LIGHT, VDC OPERATING INDICA-

TOR LIGHT OR VDC OFF INDICATOR LIGHT DOES NOT COME ON.

DIAGNOSIS:
• ABS warning light circuit is open or shorted.
• VDC warning light circuit is open or shorted.
• VDC operating indicator light circuit is open or shorted.
• VDC OFF indicator light circuit is open or shorted.
TROUBLE SYMPTOM:
• When ignition switch is turned ON (engine OFF), ABS warning light, VDC warning light, VDC operating in-
dicator light or VDC OFF indicator light does not come on.

NOTE:
When pushing the VDC OFF switch for 10 seconds or more while revving the engine, the VDC OFF indicator
light goes off and operations cannot be continued. Turn ignition switch from OFF to ON again to recover the
previous condition.

VDC-34

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

WIRING DIAGRAM:
• 3.0 L model

VDC00173

NO. 18 15A

SBF-4

DIAGNOSIS
TERMINAL

b5

a8

c7

L

b9

b3

c9

VDC W

A

RNING

LIGHT

VDC

OPERA

TING

b2

R

c10

c6

b1

VDC OFF

ABS

W

ARNING

G1

E1

F1

H1

18

12

11

13

20

5

R

L

13

R

L

14

7

4

16

10

54

32

52

53

13

40

55

1

28

SBF-1 100A

NO. 5 15A

8

DIAGNOSIS
CONNECTOR

VDC OFF
SWITCH

VDC CONTROL MODULE

i1

B36

B81

B82

F87

i10

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

B82

1 2

3

4 5 6 7 8

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

B36

B4 B5 B6

A4 A5 A6

C5 C6

F6

D4 D5 D6

F1

H1

C4

G6

G1

C2

K1

M1 M2

K6

L1

D1 D2

A1 A2
B1 B2

I6

J6

L2

I1

J1

H6

M4 M5 M6

L4 L5 L6

N5 N6

O4 O5 O6

N4

P4 P5

N2

O1 O2

P1 P2

N3

O3

P3

P6

A3

B3

C3

E4 E5 E6

E1 E2

i10

a:

i11

b:

i12

B255

F96

c:

COMBINATION
METER

BATTERY

IGNITION

SWITCH

IGNITION

RELAY

i62

i61

i60

i1

B36

: LHD MODEL

: RHD MODEL

L

R

3
5

6

16

J1

i62

1

2

3 4 5 6

i12

1 2 3

8

9 10

4

11 12 13

14 15 16

5 6 7

17 18

i11

1 2 3
8 9 10

4

11 12 13 14 15 16

5 6 7

RHD

RHD

LHD

LHD

RHD

LHD

LHD

RHD

B62

L

:

B100

R

:

F45

L

:

F2

R

:

F2

i60

R

:

F96

R

:

F45

L

:

F96

L

:

1 2 3 4

5 6 7

8 9 10 11 12 13 14 15 16

3 4

1 2

8 9 10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

5 6

7

1 2 3

4 5 6

7 8 9 10 11 12 13 14

1 2 3

8

9 10

4

11 12 13 14 15 16

5 6 7

17 18

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

VDC-35

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

• Except 3.0 L model

VDC00172

NO. 18 15A

SBF-4

DIAGNOSIS
TERMINAL

C3

c11

a1

a2

c4

VDC W

A

RNING

LIGHT

VDC

OPERA

TING

c6

VDC OFF

ABS

W

ARNING

G1

E1

H1

18

12

11

13

20

5

R

L

13

R

L

14

7

4

16

10

54

32

52

53

13

40

55

1

28

SBF-1 100A

NO. 5 15A

8

DIAGNOSIS
CONNECTOR

VDC OFF
SWITCH

VDC CONTROL MODULE

i1

B36

B81

B82

F87

i10

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

B82

1 2

3

4 5 6 7 8

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

B36

B4 B5 B6

A4 A5 A6

C5 C6

F6

D4 D5 D6

F1

H1

C4

G6

G1

C2

K1

M1 M2

K6

L1

D1 D2

A1 A2
B1 B2

I6

J6

L2

I1

J1

H6

M4 M5 M6

L4 L5 L6

N5 N6

O4 O5 O6

N4

P4 P5

N2

O1 O2

P1 P2

N3

O3

P3

P6

A3

B3

C3

E4 E5 E6

E1 E2

i10

a:

i12

c:

B255

F96

COMBINATION
METER

BATTERY

IGNITION

SWITCH

IGNITION

RELAY

i62

i61

i60

i1

B36

: LHD MODEL

: RHD MODEL

L

R

3
5

6

16

J1

i62

1

2

3 4 5 6

i12

1 2 3

8

9 10

4

11 12 13

14 15 16

5 6 7

17 18

RHD

RHD

LHD

LHD

RHD

LHD

LHD

RHD

B62

L

:

B100

R

:

F45

L

:

F2

R

:

F2

i60

R

:

F96

R

:

F45

L

:

F96

L

:

1 2 3 4

5 6 7

8 9 10 11 12 13 14 15 16

3 4

1 2

8 9 10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

5 6

7

1 2 3

4 5 6

7 8 9 10 11 12 13 14

1 2 3

8

9 10

4

11 12 13 14 15 16

5 6 7

17 18

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20