Subaru Legacy (2005 year). Service manual — part 811
VDC(diag)-109
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AY:DTC C0072 YAW RATE SENSOR POWER/OUTPUT
DTC DETECTING CONDITION:
Defective yaw rate sensor
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
VDC00222
28
2
1
30
3
16
6
B312
B347
4
2
1
3
5
6
B230
1
B230
B310
VDCCM & H/U
1
3
4 5 6
2
B312
1 2
B310
E
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
YAW RATE &
LATERAL G SENSOR
VDC(diag)-110
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK YAW RATE & LATERAL G SENSOR
POWER SUPPLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from yaw rate &
lateral G sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between yaw rate &
lateral G sensor and chassis ground.
Connector & terminal
(B230) No. 3 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V?
2
CHECK OUTPUT VOLTAGE OF VDCCM&H/
U.
Measure the voltage between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 30 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V?
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
3
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector?
Correct or replace
the connector.
4
CHECK GROUND CIRCUIT OF YAW RATE &
LATERAL G SENSOR.
Measure the resistance between yaw rate &
lateral G sensor and chassis ground.
Connector & terminal
(B230) No. 6 — Chassis ground:
Is the resistance less than 0.5
Ω?
5
CHECK GROUND CIRCUIT OF VDCCM&H/U.
Measure the resistance between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 16 — Chassis ground:
Is the resistance less than 0.5
Ω?
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
6
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector?
Correct or replace
the connector.
7
CHECK YAW RATE & LATERAL G SENSOR
HARNESS.
1) Disconnect the connector from VDCCM&H/
U.
2) Measure the resistance between
VDCCM&H/U and yaw rate & lateral G sensor.
Connector & terminal
(B310) No. 28 — (B230) No. 4:
Is the resistance less than 0.5
Ω?
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
8
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 28 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
9
CHECK YAW RATE & LATERAL G SENSOR.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) Check the signal pattern of oscilloscope
between VDCCM&H/U connector terminals.
<Ref. to VDC(diag)-15, WAVEFORM, MEA-
SUREMENT, Control Module I/O Signal.>
Connector & terminal
(B310) No. 2 — No. 16:
(B310) No. 28 — No. 16:
Is the oscilloscope pattern the
same waveform as shown in
the figure?
Replace the yaw
rate & lateral G
sensor.
VDC(diag)-111
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
10
CHECK YAW RATE & LATERAL G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Perform the clear memory mode.
4) Perform the inspection mode.
5) Read the DTC.
Is the same DTC displayed?
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
11
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Temporary poor
contact occurs.
Step
Check
Yes
No
VDC(diag)-112
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AZ:DTC C0072 YAW RATE SENSOR REFERENCE
DTC DETECTING CONDITION:
Defective yaw rate sensor
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
VDC00222
28
2
1
30
3
16
6
B312
B347
4
2
1
3
5
6
B230
1
B230
B310
VDCCM & H/U
1
3
4 5 6
2
B312
1 2
B310
E
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
YAW RATE &
LATERAL G SENSOR
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