Subaru Legacy III (2000-2003 year). Service manual — part 806
VDC-260
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
7
CHECK OPEN CIRCUIT IN YAW RATE AND
LATERAL G SENSOR OUTPUT HARNESS
AND GROUND HARNESS.
1) Connect connector to yaw rate and lateral
G sensor.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector terminals.
Connector & terminal
(F87) No. 70 — No. 64:
Is the measured value within the specified
range?
4.3 — 4.9 k
Ω
Repair harness/
connector
between yaw rate
and lateral G sen-
sor and VDCCM.
8
CHECK GROUND SHORT IN YAW RATE
AND LATERAL G SENSOR HARNESS.
1) Disconnect connector from yaw rate and
lateral G sensor.
2) Measure resistance between VDCCM con-
nector and chassis ground.
Connector & terminal
(F87) No. 63 — Chassis ground:
(F87) No. 70 — Chassis ground:
(F87) No. 64 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.
9
CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Remove yaw rate and lateral G sensor from
vehicle.
3) Connect connector to yaw rate and lateral
G sensor.
4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between yaw rate and lat-
eral G sensor connector terminals.
Connector & terminal
(R100) No. 5 (+) — No. 6 (
−−−−
):
Is the measured value within the specified
range when yaw rate and lateral G sensor
is horizontal?
2.3 — 2.7 V
Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sensor.>
10
CHECK YAW RATE AND LATERAL G SEN-
SOR.
Measure voltage between yaw rate and lateral
G sensor connector terminals.
Connector & terminal
(R100) No. 5 (+) — No. 6 (
−−−−
):
Is the measured value within the specified
range when yaw rate and lateral G sensor is
inclined 90× to left?
3.3 — 3.7 V
Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sensor.>
11
CHECK YAW RATE AND LATERAL G SEN-
SOR.
Measure voltage between yaw rate and lateral
G sensor connector terminals.
Connector & terminal
(R100) No. 5 (+) — No. 6 (
−−−−
):
Is the measured value within the specified
range when yaw rate and lateral G sensor is
inclined 90× to right?
1.3 — 1.7 V
Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sensor.>
Step
Value
Yes
No
VDC-261
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
12
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connector between
VDCCM and yaw rate and lateral G sensor?
There is poor contact.
Repair connector.
13
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 pattern.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
14
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.
Step
Value
Yes
No
VDC-262
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
BC:DTC 74 VOLTAGE INPUTTED TO PRESSURE SENSOR 1 EXCEEDS SPECI-
FICATION. (PRIMARY PRESSURE SENSOR)
DIAGNOSIS:
• Faulty primary pressure sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00181
78
36
77
76
F91
VDC5
F88
2
3
F88
F91
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
VDC HYDRAULIC
UNIT
PRIMAR
Y
PRESSURE SENSOR
SECOND
AR
Y
PRESSURE SENSOR
15
13
16
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
F87
VDC
CONTROL
MODULE
1
3
4 5 6
2
VDC-263
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK GROUND CIRCUIT OF PRESSURE
SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector (F91) from VDCH/U.
3) Measure resistance between VDCH/U con-
nector and chassis ground.
Connector & terminal
(F91) No. 15 — Chassis ground:
Is the measured value less than the speci-
fied value?
0.5
Ω
2
CHECK GROUND CIRCUIT OF VDCCM.
1) Disconnect connector from VDCCM.
2) Remove cover from VDCCM. <Ref. to
VDC-19, VDCCM Connector Cover.>
3) Connect connector to VDCCM.
4) Measure resistance between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 76 — Chassis ground:
Is the measured value less than the speci-
fied value?
0.5
Ω
Replace harness
between VDCH/U
and VDCCM.
3
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in VDCCM connector?
There is poor contact.
Repair or replace
VDCCM connec-
tor.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
4
CHECK POWER SUPPLY OF PRESSURE
SENSOR.
NOTE:
When this inspection is carried out, DTC 51 AB-
NORMAL VALVE RELAY is memorized, but
this does not indicate valve relay malfunction.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-
nector terminals.
Connector & terminal
(F91) No. 16 (+) — No. 15 (
−−−−
):
Is the measured value within the specified
range?
4.75 — 5.25 V
5
CHECK POWER SUPPLY OF VDCCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Remove cover from VDCCM. <Ref. to
VDC-19, REMOVE, VDCCM Connector
Cover.>
4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 78 (+) — No. 76 (
−−−−
):
Is the measured value within the specified
range?
4.75 — 5.25 V
Repair harness
between VDCH/U
and VDCCM.
6
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in VDCCM connector?
There is poor contact.
Repair or replace
VDCCM connec-
tor.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
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