Subaru Legacy III (2000-2003 year). Manual — part 790
VDC-196
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AI: DTC 48 ERRONEOUS COMMUNICATION FROM EGI TO VDC
DIAGNOSIS:
• EAS communication line is broken or short circuited.
• EAC communication line is broken or 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-197
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN ECM AND VD-
CCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM and
ECM.
3) Measure resistance between VDCCM and
ECM.
Connector & terminal
H4 engine RHD without OBD model
(F87) No. 45 — (B134) No. 24:
(F87) No. 75 — (B134) No. 25:
H4 engine RHD with OBD model
(F87) No. 45 — (B134) No. 32:
(F87) No. 75 — (B134) No. 33:
H4 engine LHD model
(F87) No. 45 — (B134) No. 24:
(F87) No. 75 — (B134) No. 25:
H6 engine model
(F87) No. 45 — (B136) No. 12:
(F87) No. 75 — (B136) No. 11:
Is the measured value less than the speci-
fied value?
0.5
Ω
Repair or replace
open circuit
between VDCCM
and ECM.
2
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 75 (
++++
) — Chassis ground (
−−−−
):
(F87) No. 45 (
++++
) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
0.5 V
Repair or replace
battery short cir-
cuit between
VDCCM and ECM.
3
CHECK INPUT VOLTAGE FROM ECM.
1) Turn ignition switch to OFF.
2) Connect connector to VDCCM.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
H4 engine RHD without OBD model
(B134) No. 24 (+) — Chassis ground (
−−−−
):
(B134) No. 25 (+) — Chassis ground (
−−−−
):
H4 engine RHD with OBD model
(B134) No. 32 (+) — Chassis ground (
−−−−
):
(B134) No. 33 (+) — Chassis ground (
−−−−
):
H4 engine LHD model
(B134) No. 24 (+) — Chassis ground (
−−−−
):
(B134) No. 25 (+) — Chassis ground (
−−−−
):
H6 engine model
(B136) No. 12 (+) — Chassis ground (
−−−−
):
(B136) No. 11 (+) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
4
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.
VDC-198
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
5
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).>
6
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-199
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
MEMO:
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