Subaru Legacy (2005 year). Manual — part 814
VDC(diag)-121
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BF:DTC C0073 LATERAL G SENSOR POWER/OUTPUT
DTC DETECTING CONDITION:
Defective lateral G sensor
DTC DETECTING CONDITION:
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)-122
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK LATERAL G SENSOR OUTPUT.
1) Park the vehicle on a level surface.
2) Select {Current Data Display & Save} in
Subaru Select Monitor.
3) Read the lateral G sensor output displayed
on display.
Is the indicated reading on the
monitor display
−1.5 —1.5 m/
s
2
?
2
CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
Is there poor contact in con-
nector between VDCCM&H/U
and yaw rate & lateral G sen-
sor?
Repair the con-
nector.
3
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?
4
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.
5
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector?
Correct or replace
the connector.
6
CHECK OPEN CIRCUIT IN LATERAL G SEN-
SOR OUTPUT HARNESS.
1) Disconnect the connector from yaw rate &
lateral G sensor.
2) Disconnect the connector from VDCCM&H/
U.
3) Measure the resistance between
VDCCM&H/U and yaw rate & lateral G sensor.
Connector & terminal
(B310) No. 3 — (B230) No. 5:
Is the resistance less than 0.5
Ω?
Repair the har-
ness connector
between yaw rate
& lateral G sensor
and VDCCM&H/U.
7
CHECK GROUND SHORT CIRCUIT FOR
YAW RATE & LATERAL G SENSOR HAR-
NESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 3 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the har-
ness connector
between yaw rate
& lateral G sensor
and VDCCM&H/U.
8
CHECK LATERAL G SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the yaw rate & lateral G sensor
from vehicle.
3) Connect the connector to the yaw rate &
lateral G sensor.
4) Connect the connector to VDCCM&H/U.
5) Turn the ignition switch to ON.
6) Measure the voltage between yaw rate &
lateral G sensor connector terminals.
Connector & terminal
(B230) No. 5 (+) — No. 6 (
−
):
Is the voltage 2.35 — 2.65 V
when yaw rate & lateral G sen-
sor is on level?
Replace the yaw
rate & lateral G
sensor.
VDC(diag)-123
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
9
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector between VDCCM&H/U
and yaw rate & lateral G sen-
sor?
Repair the con-
nector.
10
CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Perform the clear memory mode.
3) Perform the inspection mode.
4) 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)-124
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BG:DTC C0074 PRESSURE SENSOR TEST MALFUNCTION
DTC DETECTING CONDITION:
Defective pressure sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00223
27
11
12
B348
B348
1
2
3
B310
VDCCM & H/U
B310
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
1
2
3
PRESSURE SENSOR
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