Subaru Legacy III (2000-2003 year). Service manual — part 803
VDC-248
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
7
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 66 (
++++
) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
0.5 V
Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.
8
CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Install yaw rate and lateral G sensor to
body.
3) Remove VDCCM connector cover. <Ref. to
VDC-19, VDCCM Connector Cover.>
4) Connect all connectors.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 66 (+) — No. 64 (
−−−−
):
Is the measured value within the specified
range?
2.1 — 2.9 V
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sensor.>
Step
Value
Yes
No
VDC-249
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
MEMO:
VDC-250
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AW:DTC 72 CHANGE RANGE OF YAW RATE SENSOR SIGNAL IS TOO BIG.
DIAGNOSIS:
• Faulty yaw rate sensor
TROUBLE SYMPTOM:
• VDC does not operate.
WIRING DIAGRAM:
VDC00182
65
63
67
66
70
64
10
11
9
F88
F55
R49
4
3
12
2
4
5
8
1
5
6
R100
6
F88
R100
F55
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
F87
VDC
CONTROL
MODULE
YAW RATE
AND LATERAL G
SENSOR
1
3
4 5 6
2
1 2 3
4 5
6 7 8 9 10 11 12
3
1
3
4 5 6
2
VDC-251
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK RUNNING FIELD.
Was the vehicle driven on surfaces with holes
or bumps at high speeds?
Driven.
When driving on
surfaces with
holes or bumps at
high speeds,
VDCCM some-
times records trou-
ble codes in
memory.
2
CHECK INSTALLATION OF YAW RATE AND
LATERAL G SENSOR.
Check installation of yaw rate and lateral G
sensor.
Is the yaw rate and lateral G sensor fixed
securely?
Fixed securely.
Install yaw rate
and lateral G sen-
sor securely.
3
CHECK POWER SUPPLY OF YAW RATE
AND LATERAL G SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from yaw rate and
lateral G sensor.
3) Turn ignition switch to ON.
4) Measure voltage between yaw rate and lat-
eral G sensor and chassis ground.
Connector & terminal
(R100) No. 3 (
++++
) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
4
CHECK OUTPUT VOLTAGE OF VDCCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Remove cover for VDCCM connector.
<Ref. to VDC-19, REMOVE, VDCCM Con-
nector Cover.>
4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 63 (
++++
) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.
5
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in yaw rate and lateral G
sensor connector?
There is poor contact.
Repair or replace
VDCCM connec-
tor.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
6
CHECK GROUND CIRCUIT OF YAW RATE
AND LATERAL G SENSOR.
Measure resistance between yaw rate and lat-
eral G sensor and chassis ground.
Connector & terminal
(R100) No. 6 — Chassis ground:
Is the measured value less than the specified
value?
0.5
Ω
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