Subaru Legacy III (2000-2003 year). Service manual — part 765
VDC-96
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
5
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.
6
ERASE MEMORY.
1) Connect all connectors.
2) Erase the memory.
Can the memory be erased?
Can be erased.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
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-97
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
MEMO:
VDC-98
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
AI: 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-99
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
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.
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