Subaru Legacy III (2000-2003 year). Service manual — part 785
VDC-176
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AB:DTC 44 TCM COMMUNICATION CIRCUIT
DIAGNOSIS:
• Communication with AT control faults
TROUBLE SYMPTOM:
• VDC does not operate.
WIRING DIAGRAM:
VDC00178
B234
STEERING ANGLE SENSOR
9
18
4
2
1
3
2
3
1
5
6
4
81
27
83
1
15
R
2
5
9
L
6
B231
VDC
CONTROL
MODULE
F96
B225
F87
B56
1 2
7
8
9
5 6
3 4
10 11 12
19 20 21
13
14 15
16
17
18
22
23
24
B231
1 2 3 4
B234
1 2 3 4 5 6
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
B56
TCM
1 2 3
4 5 6
7 8 9 10 11 12 13 14
F96
L
:
F96
R
:
R
L
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
: RHD MODEL
: LHD MODEL
VDC-177
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK RESISTANCE OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect two connectors from TCM.
3) Measure resistance between TCM connec-
tor terminals.
Connector & terminal
(B56) No. 9 — No. 18:
Is the measured value within the specified
range?
57 — 63
Ω
Repair harness
between TCM and
VDCCM.
2
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in TCM connectors?
There is poor contact.
Repair connector.
3
CHECK TCM.
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 DTC indicated.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
4
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-178
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AC:DTC 45 INCORRECT VDC CONTROL MODULE
DIAGNOSIS:
• Control module out of specification
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
Step
Value
Yes
No
1
CHECK VDCCM SPECIFICATIONS.
Check the VDCCM identification mark.
VDCCM identification mark
H4 engine model
K
OUTBACK H4 enigne model
M
OUTBACK H6 enigne model
N
H4 enigne model for Australia
J
H6 enigne model for Australia OUT-
BACK
Y
Does the VDCCM identification mark agree
with the vehicle specifications?
Agree.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
2
CHECK TCM SPECIFICATIONS.
Check the TCM identification mark.
TCM identification mark
LHD H4 engine model
YZ
RHD H4 engine model
ZG
LHD OUTBACK H4 enigne model
ZB
RHD OUTBACK H4 enigne model
ZJ
LHD OUTBACK H6 enigne model
ZD
RHD OUTBACK H6 enigne model
ZL
Does the TCM identification mark agree with
the vehicle specifications?
Agree.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
3
CHECK TCM.
1) Replace TCM. <Ref. to AT-76, Transmis-
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.
The original TCM
has been faulty.
4
CHECK TCM.
Is the same diagnostic trouble
code as in the current diagno-
sis still being output?
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
VDC-179
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
5
CHECK VDCCM.
1) Install original TCM.
2) Replace VDCCM. <Ref. to VDC-8, VDC
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 DTC indicated.
The original
VDCCM has been
faulty.
6
CHECK VDCCM.
Is the same diagnostic trouble code as in the
current diagnosis still being output?
Same DTC indicated.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
Step
Value
Yes
No
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