Subaru Legacy III (2000-2003 year). Service manual — part 799
VDC-232
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AR:DTC 71 STEERING ANGLE SENSOR MALFUNCTION
DIAGNOSIS:
• Faulty steering angle sensor
TROUBLE SYMPTOM:
• VDC does not operate.
WIRING DIAGRAM:
VDC00178
B234
STEERING ANGLE SENSOR
9
18
4
2
1
3
2
3
1
5
6
4
81
27
83
1
15
R
2
5
9
L
6
B231
VDC
CONTROL
MODULE
F96
B225
F87
B56
1 2
7
8
9
5 6
3 4
10 11 12
19 20 21
13
14 15
16
17
18
22
23
24
B231
1 2 3 4
B234
1 2 3 4 5 6
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
B56
TCM
1 2 3
4 5 6
7 8 9 10 11 12 13 14
F96
L
:
F96
R
:
R
L
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
: RHD MODEL
: LHD MODEL
VDC-233
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK THE STEERING WHEEL.
1) Drive the vehicle on a flat road.
2) Stop the vehicle in a straight line.
3) Check the angle of steering wheel.
Is the measured value less than the speci-
fied value?
5
°
Perform centering
alignment of steer-
ing.
2
CHECK OUTPUT OF STEERING ANGLE
SENSOR USING SELECT MONITOR.
1) Select “Current data display & Save” on the
select monitor.
2) Read steering angle sensor output on the
select monitor display.
Does the steering angle sensor output
(value) change on the monitor display when
the steering wheel is turned in either direc-
tion?
Change
Replace steering
angle sensor.
3
CHECK RUNNING FIELD.
Check if the vehicle was driven on banked
road surfaces or sandy surfaces (not dirt road
surfaces).
Was the vehicle driven on banked road sur-
faces or sandy surfaces (not dirt road sur-
faces)?
Driven.
Driving on banked
road surfaces or
sandy surfaces
(not dirt road sur-
faces) sometimes
results in a
VDCCM memory
trouble code.
4
CHECK VDCCM.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) 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).>
5
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.
VDC-234
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
AS:DTC 71 NO SIGNAL FROM STEERING ANGLE SENSOR
DIAGNOSIS:
• Faulty steering angle sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00178
B234
STEERING ANGLE SENSOR
9
18
4
2
1
3
2
3
1
5
6
4
81
27
83
1
15
R
2
5
9
L
6
B231
VDC
CONTROL
MODULE
F96
B225
F87
B56
1 2
7
8
9
5 6
3 4
10 11 12
19 20 21
13
14 15
16
17
18
22
23
24
B231
1 2 3 4
B234
1 2 3 4 5 6
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
B56
TCM
1 2 3
4 5 6
7 8 9 10 11 12 13 14
F96
L
:
F96
R
:
R
L
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
: RHD MODEL
: LHD MODEL
VDC-235
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
Step
Value
Yes
No
1
CHECK POWER SUPPLY OF STEERING AN-
GLE SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from steering angle
sensor.
3) Turn ignition switch to ON.
4) Measure voltage between steering angle
sensor and chassis ground.
Connector & terminal
(B231) No. 4 (
++++
) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
2
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, VDC Sequence Control.>
4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 27 (
++++
) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 — 15 V
Repair harness
between yaw rate
sensor and
VDCCM.
3
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in yaw rate sensor con-
nector?
There is poor contact.
Repair or replace
VDCCM connec-
tor.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
4
CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure resistance between steering sensor
and chassis ground.
Connector & terminal
(B231) No. 3 — Chassis ground:
Is the measured value less than the specified
value?
0.5
Ω
Repair steering
angle sensor
ground harness.
5
CHECK HARNESS OF STEERING ANGLE
SENSOR.
1) Connect connector to steering angle sen-
sor.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector terminals.
Connector & terminal
(F87) No. 81 — No. 83:
Is the measured value within the specified
range?
114 — 126
Ω
Repair harness
between steering
angle sensor and
VDCCM.
6
CHECK STEERING ANGLE SENSOR.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the diagnostic trouble code.
Is the same diagnostic trouble code as in
the current diagnosis still being output?
Same DTC indicated.
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