Subaru Legacy III (2000-2003 year). Manual - part 778

VDC-148

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

9

CHECK CONTAMINATION OF ABS SENSOR 
OR TONE WHEEL.
Remove disc rotor from hub.
Is the ABS sensor pole piece or the tone wheel 
contaminated by dirt or other foreign matter?

Dirt or foreign matter found.

Thoroughly 
remove dirt or 
other foreign mat-
ter.

Go to step 10.

10

CHECK DAMAGE OF ABS SENSOR OR 
TONE WHEEL.
Are there broken or damaged teeth in the ABS 
sensor pole piece or the tone wheel?

Broken or damaged.

Replace ABS sen-
sor or tone wheel. 
Front <Ref. to 
VDC-27, Front 
ABS Sensor.> and  
<Ref. to VDC-29, 
Front Tone 
Wheel.> Rear  
<Ref. to VDC-28, 
Rear ABS Sen-
sor.> and  <Ref. to 
VDC-30, Rear 
Tone Wheel.>

Go to step 11.

11

CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value less than the specified 
value?

0.05 mm (0.0020 in)

Go to step 12.

Repair tone wheel. 
Front  <Ref. to 
VDC-29, Front 
Tone Wheel.> 
Rear  <Ref. to 
VDC-30, Rear 
Tone Wheel.>

12

CHECK VDCCM.
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 pattern.

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

Go to step 13.

13

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.

Step

Value

Yes

No

VDC-149

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

K: DTC 31 FR HOLD VALVE MALFUNCTION (FRONT RIGHT INLET VALVE 

MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 62. <Ref. to VDC-150, DTC 62 NORMAL OPENING VALVE 1 MAL-
FUNCTION (SECONDARY CUT VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>  

L: DTC 33 FL HOLD VALVE MALFUNCTION (FRONT LEFT INLET VALVE MAL-

FUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 62. <Ref. to VDC-150, DTC 62 NORMAL OPENING VALVE 1 MAL-
FUNCTION (SECONDARY CUT VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>  

M: DTC 35 RR HOLD VALVE MALFUNCTION (REAR RIGHT INLET VALVE MAL-

FUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 62. <Ref. to VDC-150, DTC 62 NORMAL OPENING VALVE 1 MAL-
FUNCTION (SECONDARY CUT VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>  

N: DTC 37 RL HOLD VALVE MALFUNCTION (REAR LEFT INLET VALVE MAL-

FUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 62. <Ref. to VDC-150, DTC 62 NORMAL OPENING VALVE 1 MAL-
FUNCTION (SECONDARY CUT VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>  

O: DTC 61 NORMAL OPENING VALVE 2 MALFUNCTION (PRIMARY CUT 

VALVE MALFUNCTION)

NOTE:
For diagnostic procedure, refer to DTC 62. <Ref. to VDC-150, DTC 62 NORMAL OPENING VALVE 1 MAL-
FUNCTION (SECONDARY CUT VALVE MALFUNCTION), Diagnostics Chart with Select Monitor.>  

VDC-150

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

P: DTC 62 NORMAL OPENING VALVE 1 MALFUNCTION (SECONDARY CUT 

VALVE MALFUNCTION)

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-151

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

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 31/(VDC5) No. 5 — (VDC2) No. 2:
DTC 33/(VDC5) No. 8 — (VDC2) No. 2:
DTC 35/(VDC5) No. 7 — (VDC2) No. 2:
DTC 37/(VDC5) No. 6 — (VDC2) No. 2:
DTC 61/(VDC5) No. 9 — (VDC2) No. 2:
DTC 62/(VDC5) No. 12 — (VDC2) No. 2:

Is the measured value within the specified 
range?

8.04 — 9.04 

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 31/(VDC5) No. 5 — Chassis 
ground:
DTC 33/(VDC5) No. 8 — Chassis 
ground:
DTC 35/(VDC5) No. 7 — Chassis 
ground:
DTC 37/(VDC5) No. 6 — Chassis 
ground:
DTC 61/(VDC5) No. 9 — Chassis 
ground:
DTC 62/(VDC5) No. 12 — 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 31/(VDC5) No. 5 (+) — Chassis 
ground (

−−−−

):

DTC 33/(VDC5) No. 8 (+) — Chassis 
ground (

−−−−

):

DTC 35/(VDC5) No. 7 (+) — Chassis 
ground (

−−−−

):

DTC 37/(VDC5) No. 6 (+) — Chassis 
ground (

−−−−

):

DTC 61/(VDC5) No. 9 (+) — Chassis 
ground (

−−−−

):

DTC 62/(VDC5) No. 12 (+) — 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).>