Subaru Legacy III (2000-2003 year). Service manual — part 808
VDC-268
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
7
CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCH/U con-
nector and chassis ground.
Connector & terminal
(F91) No. 14 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair harness
between VDCH/U
and VDCCM.
8
CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCH/U connector
and chassis ground.
Connector & terminal
(F91) No. 14 (+) — Chassis ground (
−−−−
):
Is the measured value less than the specified
value?
0.5 V
Repair harness
between VDCH/U
and VDCCM.
9
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-
nector and chassis ground.
Connector & terminal
(F91) No. 13 (+) — Chassis ground (
−−−−
):
(F91) No. 14 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
0.5 V
Repair harness
between VDCH/U
and VDCCM.
10
CHECK INPUT VOLTAGE OF PRESSURE
SENSOR.
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) Connect all connectors.
6) Turn ignition switch to ON.
7) Do not depress brake pedal.
8) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 36 (+) — No. 76 (
−−−−
):
Is the measured value within the specified
range?
0.48 — 0.72 V
Replace VDCH/U.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
11
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connector between
VDCCM and pressure sensor?
There is poor contact.
Repair connector.
12
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 DTC indicated.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
13
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-269
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
BE:DTC 74 PRESSURE SENSOR 1 OFFSET IS TOO BIG. (PRIMARY PRESSURE
SENSOR)
NOTE:
For diagnostic procedure, refer to DTC 74. <Ref. to VDC-270, DTC 74 PRESSURE SENSOR 2 OFFSET IS
TOO BIG. (SECONDARY PRESSURE SENSOR), Diagnostics Chart with Select Monitor.>
VDC-270
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
BF:DTC 74 PRESSURE SENSOR 2 OFFSET IS TOO BIG. (SECONDARY PRES-
SURE SENSOR)
DIAGNOSIS:
• Faulty 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-271
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK DRIVING TECHNIC.
Check the driver's technic.
Are the accelerator and brake pedals
depressed simultaneously while driving?
Depressed.
The VDC is nor-
mal. Erase the
diagnostic trouble
code.
NOTE:
Driving the vehicle
with both the ac-
celerator pedal
and brake pedal
depressed may
store a diagnostic
trouble code in the
memory.
2
CHECK OUTPUT OF PRESSURE SENSOR
USING SELECT MONITOR.
1) Select “Current data display & Save” on the
select monitor.
2) Read pressure sensor output on the select
monitor display.
Is the measured value within the specified
range when brake pedal is depressed?
0.48 — 0.72 V
Replace VDCH/U.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
3
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 DTC indicated.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
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.
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