Subaru Legacy III (2000-2003 year). Service manual — part 782
VDC-164
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Y: DTC 43 AET COMMUNICATION LINE MALFUNCTION
DIAGNOSIS:
• AET communication line is broken or short circuited.
TROUBLE SYMPTOM:
• VDC does not operate.
WIRING DIAGRAM:
C8
C7
C2
C8
C7
LH4
RH4
WO
C2
B5
A12
OO
B18
A4
B6
H6
A11
VDC
CONTROL
MODULE
AET
AEB
AEC
5
7
R
21
43
8
6
1
4
L
2
F87
F96
B255
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
B135
ENGINE
CONTROL
MODULE
B134
B135
A:
:
B:
:
H6
RH4 WO
B136
C:
: LH4
OO
RH4
B:
: RH4 WO
: LH4 RH4 OO
B134
A:
: H6
5 6 7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26
27 28
16 17 18 19
20 21
1 2 3 4
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
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
VDC00175
C: B136
3
4
1 2
8 9 10 11 12 13 14
15 16 17 18 19 20
21 22 23 24
5 6
7
: 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
VDC-165
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Disconnect connector from ECM.
4) Measure resistance between VDCCM con-
nector and ECM.
Connector & terminal
H4 engine RHD without OBD model
(F87) No. 21 — (B136) No. 7:
H4 engine RHD with OBD model
(F87) No. 21 — (B135) No. 6:
H4 engine LHD model
(F87) No. 21 — (B136) No. 7:
H6 engine model
(F87) No. 21 — (B134) No. 12:
Is the measured value less than the speci-
fied value?
0.5
Ω
Repair harness/
connector
between VDCCM
and ECM.
2
CHECK GROUND SHORT OF HARNESS.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 21 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair harness/
connector
between VDCCM
and ECM.
3
CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCCM connector
and chassis ground.
Terminal
(F87) No. 21 (+) — Chassis ground (
−−−−
):
Is the measured value less than the specified
value?
0.5 V
Repair harness/
connector
between VDCCM
and ECM.
4
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Terminal
(F87) No. 21 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1 V
Repair harness/
connector
between VDCCM
and ECM.
5
CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND ECM.
1) Turn ignition switch to OFF.
2) Connect connector to ECM.
3) Turn ignition switch to ON.
4) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 21 (+) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
6
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
ECM and VDCCM?
Tightened securely.
Repair connector.
VDC-166
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
7
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 DTC indicated.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
8
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.
9
CHECK ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector
terminal and chassis ground.
Connector & terminal
H4 engine RHD without OBD model
(B136) No. 7 (+) — Chassis ground (
−−−−
):
H4 engine RHD with OBD model
(B135) No. 6 (+) — Chassis ground (
−−−−
):
H4 engine LHD model
(B136) No. 7 (+) — Chassis ground (
−−−−
):
H6 engine model
(B134) No. 12 (+) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
Repair harness/
connector
between ECM and
VDCCM.
10
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connector ECM?
There is poor contact.
Repair connector.
11
CHECK ENGINE.
Is the engine functioning normally?
Operates properly.
Replace ECM.
<Ref. to
FU(H6DO)-46,
Engine Control
Module.>
Repair engine.
Step
Value
Yes
No
VDC-167
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
MEMO:
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