Subaru Legacy III (2000-2003 year). Manual - part 758

VDC-68

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

U: DTC 32 ABNORMAL OUTLET AND SUCTION SOLENOID VALVE CIRCUIT(S) 

(FRONT RH OUTLET)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-70, DTC 64 ABNORMAL OUTLET AND SUCTION
SOLENOID VALVE CIRCUIT(S) (SECONDARY SUCTION), Diagnostics Chart with Diagnosis Connector.>  

V: DTC 34 ABNORMAL OUTLET AND SUCTION SOLENOID VALVE CIRCUIT(S) 

(FRONT LH OUTLET)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-70, DTC 64 ABNORMAL OUTLET AND SUCTION
SOLENOID VALVE CIRCUIT(S) (SECONDARY SUCTION), Diagnostics Chart with Diagnosis Connector.>  

W: DTC 36 ABNORMAL OUTLET AND SUCTION SOLENOID VALVE CIRCUIT(S) 

(REAR RH OUTLET)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-70, DTC 64 ABNORMAL OUTLET AND SUCTION
SOLENOID VALVE CIRCUIT(S) (SECONDARY SUCTION), Diagnostics Chart with Diagnosis Connector.>  

X: DTC 38 ABNORMAL OUTLET AND SUCTION SOLENOID VALVE CIRCUIT(S) 

(REAR LH OUTLET)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-70, DTC 64 ABNORMAL OUTLET AND SUCTION
SOLENOID VALVE CIRCUIT(S) (SECONDARY SUCTION), Diagnostics Chart with Diagnosis Connector.>  

Y: DTC 63 ABNORMAL OUTLET AND SUCTION SOLENOID VALVE CIRCUIT(S) 

(PRIMARY SUCTION)

NOTE:
For diagnostic procedure, refer to DTC 64. <Ref. to VDC-70, DTC 64 ABNORMAL OUTLET AND SUCTION
SOLENOID VALVE CIRCUIT(S) (SECONDARY SUCTION), Diagnostics Chart with Diagnosis Connector.>  

VDC-69

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

MEMO:

VDC-70

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

Z: DTC 64 ABNORMAL OUTLET AND SUCTION SOLENOID VALVE CIRCUIT(S) 

(SECONDARY SUCTION)

DIAGNOSIS:
• Faulty harness/connector
• Faulty solenoid valve in VDCH/U
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:

VDC00142

VDC1

1 2

F91

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

10

9

11

12

15

13

16

14

VDC HYDRAULIC UNIT

VDC5

F91

VDC CONTROL MODULE

F87

FR OUTLET

FR INLET

RL OUTLET

RL INLET

RR OUTLET

RR INLET

PRIMAR

Y CUT

PRIMAR

Y SECTION

SECOND

AR

Y CUT

PRIMAR

Y

PRESSURE SENSOR

SECOND

A

R

Y

PRESSURE SENSOR

SECOND

AR

Y SECTION

FL OUTLET

FL INLET

51

30

3

31

4

23

50

24

25

2

26

36

76

77

78

29

4

5

1

6

2

7

3

8

VDC2

VDC1

1
2

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

RELAY BOX

MOTOR RELAY

VALVE RELAY

VDC-71

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

Step

Value

Yes

No

1

CHECK RESISTANCE OF SOLENOID 
VALVE.
1) Turn ignition switch to OFF.
2) Disconnect two connectors (VDC1, F91) 

from VDCH/U.

3) Measure resistance between VDCH/U con-

nector terminals.

Connector & terminal

DTC 32/(VDC5) No. 1 — (VDC2) No. 2:
DTC 34/(VDC5) No. 4 — (VDC2) No. 2:
DTC 36/(VDC5) No. 3 — (VDC2) No. 2:
DTC 38/(VDC5) No. 2 — (VDC2) No. 2:
DTC 63/(VDC5) No. 10 — (VDC2) No. 2:
DTC 64/(VDC5) No. 11 — (VDC2) No. 2:

Is the measured value within the specified 
range?

3.8 — 4.8 

Ω

Go to step 2.

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

2

CHECK GROUND SHORT OF SOLENOID 
VALVE.
Measure resistance between VDCH/U connec-
tor and chassis ground.

Connector & terminal

DTC 32/(VDC5) No. 1 — Chassis 
ground:
DTC 34/(VDC5) No. 4 — Chassis 
ground:
DTC 36/(VDC5) No. 3 — Chassis 
ground:
DTC 38/(VDC5) No. 2 — Chassis 
ground:
DTC 63/(VDC5) No. 10 — Chassis 
ground:
DTC 64/(VDC5) No. 11 — Chassis 
ground:

Does the measured value exceed the specified 
value?

1 M

Ω

Go to step 3.

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

3

CHECK BATTERY SHORT OF SOLENOID 
VALVE.
1) Disconnect connector from VDCCM.
2) Measure voltage between VDCH/U con-

nector and chassis ground.

Connector & terminal

DTC 32/(VDC5) No. 1 (+) — Chassis 
ground (

−−−−

):

DTC 34/(VDC5) No. 4 (+) — Chassis 
ground (

−−−−

):

DTC 36/(VDC5) No. 3 (+) — Chassis 
ground (

−−−−

):

DTC 38/(VDC5) No. 2 (+) — Chassis 
ground (

−−−−

):

DTC 63/(VDC5) No. 10 (+) — Chassis 
ground (

−−−−

):

DTC 64/(VDC5) No. 11 (+) — Chassis 
ground (

−−−−

):

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

1 V

Go to step 4.

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