Subaru Legacy III (2000-2003 year). Service manual — part 791
VDC-200
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AJ:DTC 49 ABNORMAL ENGINE SPEED SIGNAL
DIAGNOSIS:
• Engine speed signal line is broken or short circuited.
TROUBLE SYMPTOM:
• VDC does not operate.
WIRING DIAGRAM:
VDC00180
C9
A30
9
VDC
CONTROL
MODULE
F87
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
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
H6
RH4
A10
A10
WO
O
O
LH4
ENGINE
CONTROL
MODULE
B134
B136
A:
:
C:
:
H4
H6
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
: 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
10
R
3
L
F96
B255
VDC-201
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK TACHOMETER OPERATION IN
COMBINATION METER.
Does tachometer operate normally?
Operates properly.
Repair tachome-
ter.
2
CHECK HARNESS BETWEEN VDCCM AND
ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM and
ECM.
3) Measure resistance between VDCCM con-
nector and ECM.
Connector & terminal
H4 engine RHD without OBD model
(F87) No. 9 — (B134) No. 10:
H4 engine RHD with OBD model
(F87) No. 9 — (B134) No. 30:
H4 engine LHD model
(F87) No. 9 — (B134) No. 10:
H6 engine model
(F87) No. 9 — (B136) No. 9:
Is the measured value less than the speci-
fied value?
0.5
Ω
Repair harness
connector
between VDCCM
and ECM.
3
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
VDCCM and ECM?
There is poor contact.
Repair connector.
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).>
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-202
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AK:DTC 51 VALVE RELAY
DIAGNOSIS:
• Faulty valve relay
NOTE:
When DTC 74 inspection is carried out, DTC 51 is memorized.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00150
10
9
11
12
15
13
16
14
VDC HYDRAULIC UNIT
VALVE RELAY
87
87a
VDC2
VDC1
4
6
86
1
85
30
30
86
85
87
5
VDC4
F90
VDC5
F91
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
SBF-3 50A
VDC7
VDC6
MOTOR RELAY
VALVE RELAY
VDC CONTROL MODULE
22
10
27
47
F87
1
2
F89
VDC3
1
SBF-1 100A
RELAY BOX
F89
VDC1
1 2
F90
1
3
4 5 6
2
NO. 8 30A
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
85
86
87
87a
30
85
86
87
30
F91
VDC6
VDC7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
BATTERY
VDC-203
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK RESISTANCE OF VALVE RELAY.
1) Turn ignition switch to OFF.
2) Remove valve relay from relay box.
3) Measure resistance between valve relay
terminals.
Terminals
No. 85 — No. 86:
Is the measured value within the specified
range?
93 — 113
Ω
Replace valve
relay.
2
CHECK CONTACT POINT OF VALVE RE-
LAY.
1) Connect battery to valve relay terminals
No. 85 and No. 86.
2) Measure resistance between valve relay
terminals.
Terminals
No. 30 — No. 87:
Is the measured value less than the speci-
fied value?
0.5
Ω
Replace valve
relay.
3
CHECK CONTACT POINT OF VALVE RE-
LAY.
Measure resistance between valve relay termi-
nals.
Terminals
No. 30 — No. 87a:
Does the measured value exceed the specified
value?
1 M
Ω
Replace valve
relay.
4
CHECK CONTACT POINT OF VALVE RE-
LAY.
1) Disconnect battery from valve relay termi-
nals.
2) Measure resistance between valve relay
terminals.
Terminals
No. 30 — No. 87:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Replace valve
relay.
5
CHECK CONTACT POINT OF VALVE RE-
LAY.
Measure resistance between valve relay termi-
nals.
Terminals
No. 30 — No. 87a:
Is the measured value less than the specified
value?
0.5
Ω
Replace valve
relay.
6
CHECK SHORT OF VALVE RELAY.
Measure resistance between valve relay termi-
nals.
Terminals
No. 86 — No. 87:
No. 86 — No. 87a:
Does the measured value exceed the specified
value?
1 M
Ω
Replace valve
relay.
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