Subaru Legacy (2005 year). Manual - part 781

VDC-13

VEHICLE DYNAMICS CONTROL (VDC)

VDC Sequence Control

2. CONDITIONS FOR VDC SEQUENCE CONTROL

(20)

ON

ON

(23)

(23)

(23)

(4)

(5)

(19)

(32)

(3)

(2)

(1)

(22)

(22)

(22)

(22)

V max < 4 km/h (2.5 MPH)

V max < 10 km/h (6 MPH)

OFF

OFF

OFF

OFF

OFF

ON

VDC

(21)

(27)

(28)

(25)

(26)

(24)

(29)

(30) (31)

(25)

(24)

(8)

(7)

(9)

(10)

OFF

(11)

OFF

(12)

OFF

(14)

OFF

(15)

OFF

(16)

OFF

(13)

OFF

(18)

OFF

(17)

(6)

(33)

(35)

(34)

(36)

VDC00275

(29)

(30) (31)

(25)

VDC-14

VEHICLE DYNAMICS CONTROL (VDC)

VDC Sequence Control

NOTE:
The control operation starts from point A.

B: SPECIFICATION

1. CONDITIONS FOR COMPLETION OF 
VDC SEQUENCE CONTROL

When the following conditions develop, the VDC
sequence control stops and VDC operation is re-
turned to the normal control mode.
1) When the speed of at least one wheel reaches
10 km/h (6 MPH).
2) When the brake pedal is pressed during se-
quence control and the stop light switch is set to
ON.
3) After completion of VDC sequence control.
4) When malfunction is detected.

(1)

All wheel speed

(13)

FR decompression valve

(25)

1 sec.

(2)

Ignition key

(14)

FR compression valve

(26)

1.6 sec.

(3)

ABS warning light

(15)

RR decompression valve

(27)

Point A

(4)

VDC warning light

(16)

RR compression valve

(28)

Reset

(5)

Stop light switch

(17)

RL decompression valve

(29)

0.8 sec.

(6)

Valve relay

(18)

RL compression valve

(30)

1.2 sec.

(7)

VDC switching valve 1 FL

(19)

Pump motor

(31)

0.4 sec.

(8)

VDC switching valve 1 FR

(20)

1.5 sec.

(32)

Master cylinder pressure

(9)

VDC switching valve 2 FL

(21)

Approx. 3 sec.

(33)

FR wheel cylinder pressure

(10)

VDC switching valve 2 FR

(22)

Light OFF

(34)

FL wheel cylinder pressure

(11)

FL decompression valve

(23)

Light ON

(35)

RL wheel cylinder pressure

(12)

FL compression valve

(24)

3.4 sec.

(36)

RR wheel cylinder pressure

VDC-15

VEHICLE DYNAMICS CONTROL (VDC)

Yaw Rate and Lateral G Sensor

5. Yaw Rate and Lateral G Sen-

sor

A: REMOVAL

1) Disconnect the ground cable from battery.
2) Remove the console box. <Ref. to EI-53, Con-
sole Box.>
3) Disconnect the connector from yaw rate & lateral
G sensor.
4) Remove the yaw rate & lateral G sensor.

CAUTION:
Do not drop or bump the yaw rate & lateral G 
sensor.

B: INSTALLATION

Install in the reverse order of removal.

NOTE:
Install the yaw rate & lateral G sensor to body with
directing the arrow mark on sensors to vehicle
front.

Tightening torque:

7.5 N

⋅

m (0.76 kgf-m, 5.5 ft-lb)

CAUTION:
After completion of installation, set the follow-
ing two positions.
• Positioning to the center of steering angle
sensor
• Positioning of the yaw rate & lateral G sensor
to zero
The above procedure is required VDCCM&H/U
to identify the vehicle position afterward. For
the setting procedures of step 2 above, refer to
“VDC Control Module & Hydraulic Control Unit
(VDCCM&H/U)”. <Ref. to VDC-10, ADJUST-
MENT, VDC Control Module and Hydraulic Con-
trol Unit (VDCCM&H/U).>

VDC00204

VDC00205

VDC-16

VEHICLE DYNAMICS CONTROL (VDC)

Yaw Rate and Lateral G Sensor

C: INSPECTION

1. YAW RATE & LATERAL G SENSOR SIGNAL

Step

Check

Yes

No

1

CHECK YAW RATE & LATERAL G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor con-
nector to data link connector.
3) Turn the ignition switch to ON.
4) Set the Subaru Select Monitor to {Brake 
Control} mode.
5) Select {Current Data Display & Save}.
6) Read the output voltage of yaw rate & lat-
eral G sensor.

Are the indicated values when 
the vehicle is placed horizon-
tally Lateral G sensor: 

−1.5 — 

1.5 m/s Yaw rate sensor: 

−4 — 

4 deg/s?

Go to step 2.

Repair the har-
ness connector 
between yaw rate 
& lateral G sensor 
and VDCCM&H/U. 
Or replace the yaw 
rate & lateral G 
sensor.

2

CHECK LATERAL G SENSOR.
1) Remove the console box.
2) Remove the yaw rate & lateral G sensor 
from vehicle. (Do not disconnect the connec-
tor.)
3) Read the display of Subaru Select Monitor.

NOTE:

When the yaw rate & lateral G sensor is moved
with its power supply on, DTC of yaw rate & lat-
eral G sensor may be recorded.

Is the value 6.8 — 12.8 m/s 
when the yaw rate & lateral G 
sensors are inclined rightward 
to 90

°?

Go to step 3.

Repair the har-
ness connector 
between yaw rate 
& lateral G sensor 
and VDCCM&H/U. 
Or replace the yaw 
rate & lateral G 
sensor.

3

CHECK LATERAL G SENSOR.
Read the display of Subaru Select Monitor.

NOTE:

When the yaw rate & lateral G sensor is moved
with its power supply on, DTC of yaw rate & lat-
eral G sensor may be recorded.

Is the value 

−6.8 — −12.8 m/s 

when the yaw rate & lateral G 
sensors are inclined leftward to 
90

°?

Yaw rate & lateral 
G sensors are nor-
mal.

Repair the har-
ness connector 
between yaw rate 
& lateral G sensor 
and VDCCM&H/U. 
Or replace the yaw 
rate & lateral G 
sensor.