Subaru Legacy III (2000-2003 year). Service manual — part 789

VDC-192

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

7

CHECK DIAGNOSTIC TROUBLE CODE.
1) Perform inspection mode.
2) Read out the diagnostic trouble code.

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

Same DTC indicated.

Replace ECM.
<Ref. to
FU(H6DO)-46,
Engine Control
Module.>

A temporary poor
contact.

Step

Value

Yes

No

VDC-193

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

MEMO:

VDC-194

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

AH:DTC 48 EAS COMMUNICATION LINE GROUNDING SHORTED

DIAGNOSIS:
• EAS communication line is short circuited.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:

VDC00179

C12

A32

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

H6

RH4

A24

A24

C11

A33

A25

A25

WO

O

O

LH4

ENGINE

CONTROL

MODULE

B134

B136

A:

:

C:

:

H4

H6

: 4 CYLINDER ENGINE RHD MODEL

: 4 CYLINDER ENGINE LHD MODEL

RH4

LH4

: 4 CYLINDER ENGINE

: 6 CYLINDER ENGINE

H4

H6

: RHD MODEL

: LHD MODEL

R

L

: WITHOUT OBD MODEL

: WITH OBD MODEL

OO

WO

1 2 3

4 5 6

7 8 9 10 11 12 13 14

F96

L

:

F96

R

:

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

3

R

12

4

11

L

F96

B255

1 2

7

8 9

5

6

3

4

10 11 12
19 20 21

13 14 15 16

17 18

22 23 24

B136

C:

: H6

B134

A:

: H4

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 31 32 33

34 35

45

75

EA

C

EAS

VDC

CONTROL

MODULE

F87

VDC-195

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SELECT MONITOR

Step

Value

Yes

No

1

CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM and

ECM.

3) Measure resistance between VDCCM and

ECM.

Connector & terminal

(F87) No. 75 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 2.

Repair or replace
ground short cir-
cuit between
VDCCM and ECM.

2

CHECK INPUT VOLTAGE FROM ECM.
1) Connect connector to VDCCM.
2) Turn ignition switch to ON.
3) Measure voltage between ECM and chas-

sis ground.

Connector & terminal

H4 engine RHD without OBD model

(B134) No. 25 (+) — Chassis ground (

−−−−

):

H4 engine RHD with OBD model

(B134) No. 33 (+) — Chassis ground (

−−−−

):

H4 engine LHD model

(B134) No. 25 (+) — Chassis ground (

−−−−

):

H6 engine model

(B136) No. 11 (+) — Chassis ground (

−−−−

):

Is the measured value within the specified
range?

10 — 15 V

Go to step 4.

Go to step 3.

3

CHECK POOR CONTACT IN ECM CONNEC-
TORS.
Is there poor contact in ECM connector?

There is poor contact.

Replace ECM.
<Ref. to
FU(H6DO)-46,
Engine Control
Module.>

Repair or replace
ECM connector.

4

ERASE MEMORY.
1) Connect all connectors.
2) Erase the memory.

Can the memory be erased?

Can be erased.

Go to step 5.

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

5

CHECK DIAGNOSTIC TROUBLE CODE.
1) Perform inspection mode.
2) Read out the diagnostic trouble code.

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

Same DTC indicated.

Replace ECM.
<Ref. to
FU(H6DO)-46,
Engine Control
Module.>

A temporary poor
contact.