Subaru Legacy III (2000-2003 year). Service manual — part 777
VDC-144
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
20
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
VDCCM and ABS sensor?
There is poor contact.
Repair connector.
21
CHECK SOURCES OF SIGNAL NOISE.
Is the car telephone or the wireless transmitter
properly installed?
Installed properly.
Properly install the
car telephone or
the wireless trans-
mitter.
22
CHECK SOURCES OF SIGNAL NOISE.
Are noise sources (such as an antenna)
installed near the sensor harness?
Installed.
Install the noise
sources apart from
the sensor har-
ness.
23
CHECK SHIELD CIRCUIT.
1) Connect all connectors.
2) Measure resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 22 / (F45) No. 10 — Chassis
ground:
DTC 22 / (F2) No. 17 — Chassis ground:
DTC 24 / (F45) No. 10 — Chassis
ground:
DTC 24 / (F2) No. 17 — Chassis ground:
Is the measured value less than the speci-
fied value?
NOTE:
For the DTC 26 and 28, Go to step 25.
0.5
Ω
Repair shield har-
ness.
24
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).>
25
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 noise
interference.
Step
Value
Yes
No
VDC-145
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
MEMO:
VDC-146
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
J: DTC 29 ANY ONE OF FOUR ABS SENSOR SIGNAL
DIAGNOSIS:
• Faulty ABS sensor signal (noise, irregular signal, etc.)
• Faulty tone wheel
• Wheels turning freely for a long time
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00174
F55
F88
B15
B6
2 1
R72
R73
F45
F2
1
2
2
1
7
6
2
1
4
1
3
F88
17
15
12
13
16
14
R
10
L
F45
B62
:
:
F2
B100
:
:
F55
R49
B15
R73
49
19
17
16
14
15
1
55
46
18
1
2
B6
2
1
R72
8
9
11
12
13
VDC CONTROL MODULE
FRONT ABS
SENSOR LH
FRONT ABS
SENSOR RH
LHD
RHD
REAR ABS
SENSOR LH
REAR ABS
SENSOR RH
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
: RHD MODEL
:LHD MODEL
R
R
R
L
L
L
1
3
4 5 6
2
1 2
3 4 5
6 7 8 9 10 11 12
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
3 4
1 2
8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
5 6
7
VDC-147
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK IF THE WHEELS HAVE TURNED
FREELY.
Check if the wheels have been turned freely for
more than one minute, such as when the vehi-
cle is jacked-up, under full-lock cornering or
when tire is not in contact with road surface.
Turned freely over 1 minutes.
The VDC is nor-
mal. Erase the
diagnostic trouble
code.
NOTE:
When the wheels
turn freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or under full-
lock cornering
locked in full, this
trouble code may
sometimes occur.
2
CHECK TIRE SPECIFICATIONS.
Are the tire specifications correct?
Turned freely over 1 minutes.
Replace tire.
3
CHECK WEAR OF TIRE.
Is the tire worn excessively?
Worn excesiblely.
Replace tire.
4
CHECK TIRE PRESSURE.
Is the tire pressure correct?
Correct tire pressure.
Adjust tire pres-
sure.
5
CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
33
±±±±
10 N·m (3.3
±±±±
1.0 kgf-m, 24
±±±±
7 ft-lb)
Are the ABS sensor installation bolts tightened
securely?
Tightened securely.
Tighten ABS sen-
sor installation
bolts securely.
6
CHECK ABS SENSOR GAP.
Measure tone wheel to pole piece gap over
entire perimeter of the wheel.
Is the measured value within the specified
range?
Front wheel 0.3 - 0.8 mm
(0.012 - 0.031 in) and Rear
wheel 0.44 - 0.94 mm (0.0173 -
0.0370 in)
Adjust the gap.
NOTE:
Adjust the gap us-
ing spacer (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.
7
CHECK OSCILLOSCOPE.
Is an oscilloscope available?
Available
8
CHECK ABS SENSOR SIGNAL.
1) Raise all four wheels of ground.
2) Turn ignition switch OFF.
3) Remove VDCCM connector cover. <Ref. to
VDC-19, REMOVE, VDCCM Connector
Cover.>
4) Connect the oscilloscope to the connector.
5) Turn ignition switch ON.
6) Rotate wheels and measure voltage at
specified frequency. <Ref. to ABS-15,
WAVEFORM, Control Module I/O Signal.>
NOTE:
When this inspection is completed, the VDCCM
sometimes stores the DTC 29.
Connector & terminal
(F49) No. 14 (+) — No. 15 (
−−−−
) (Front RH):
(F49) No. 49 (+) — No. 19 (
−−−−
) (Front LH):
(F49) No. 18 (+) — No. 46 (
−−−−
) (Rear RH):
(F49) No. 16 (+) — No. 17 (
−−−−
) (Rear LH):
Is oscilloscope pattern smooth, as shown in
figure?
Smooth pattern.
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