Subaru Legacy IV (2008 year). Service manual — part 923
VDC(diag)-7
Check List for Interview
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Condition
a) Brakes
Deceleration:
G
Continuous /
Intermittent
b) Accelerator
Acceleration:
G
Continuous /
Intermittent
c) Vehicle speed
km/h
MPH
Advancing
While accelerating
While decelerating
At low speed
When turning
Others:
d) Tire inflation pressure
Front RH tire:
kPa
Front LH tire:
kPa
Rear RH tire:
kPa
Rear LH tire:
kPa
e) Degree of wear
Front RH tire:
Front LH tire:
Rear RH tire:
Rear LH tire:
f) Steering wheel
Sharp turning
Gentle turning
Straight forward motion
Gentle return
Sharp return
g) Tire/Wheel size
Specified size
Except specification ( )
h) Tire variation
Summer tire
Studless tire (Brand:
)
i) Tire chain is attached:
Yes /
No
j) T-type tire is used:
Yes /
No
k) Condition of suspension alignment:
l) Loading state:
m) Repair parts are used:
Yes /
No
• Contents:
n) Others:
VDC(diag)-8
General Description
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
3. General Description
A: CAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
“AIRBAG”
Airbag system wiring harness is routed near the
ABS wheel speed sensor and VDCCM&H/U.
CAUTION:
• All airbag system wiring harness and con-
nectors are colored yellow. Do not use electri-
cal test equipment on these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the ABS wheel
speed sensor and VDCCM&H/U.
B: INSPECTION
Before performing diagnosis, check the following
items which might affect VDC problems.
1. BATTERY
Measure the battery voltage and check electrolyte.
Standard voltage:
12 V or more
Specific gravity:
1.260 or more
2. GROUND
Check the tightening torque of ground (GB-7) bolt
of VDC.
Tightening torque:
13 N·m (1.3 kgf-m, 9.6 ft-lb)
3. BRAKE FLUID
1) Check the brake fluid level.
2) Check the brake fluid for leaks.
4. HYDRAULIC UNIT
Check the hydraulic unit.
• With brake tester <Ref. to VDC-8, CHECKING
THE HYDRAULIC UNIT ABS OPERATION WITH
THE BRAKE TESTER, INSPECTION, VDC Con-
trol Module and Hydraulic Control Unit (VDC-
CM&H/U).>
• Without brake tester <Ref. to VDC-8, CHECK-
ING THE HYDRAULIC UNIT ABS OPERATION
BY PRESSURE GAUGE, INSPECTION, VDC
Control Module and Hydraulic Control Unit (VDC-
CM&H/U).>
5. BRAKE DRAG
Check for brake drag.
6. BRAKE PAD AND ROTOR
Check the brake pad and rotor.
• Front <Ref. to BR-13, INSPECTION, Front Brake
Pad.> <Ref. to BR-14, INSPECTION, Front Disc
Rotor.>
• Rear <Ref. to BR-19, INSPECTION, Rear Brake
Pad.> <Ref. to BR-21, INSPECTION, Rear Disc
Rotor.>
7. TIRE
Check the tire specifications, tire wear and air pres-
sure. <Ref. to WT-2, SPECIFICATION, General
Description.>
C: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
1B022XU0
SUBARU SELECT
MONITOR III KIT
Used for troubleshooting the electrical system.
TOOL NAME
REMARKS
Circuit tester
Used for measuring resistance, voltage and current.
Oscilloscope
Used for measuring the sensor.
ST1B022XU0
VDC(diag)-9
Electrical Component Location
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
4. Electrical Component Location
A: LOCATION
(1)
VDC control module and hydraulic
control unit (VDCCM&H/U)
(5)
ABS warning light
(10)
Magnetic encoder
(6)
VDC indicator light
(11)
ABS wheel speed sensor
(2)
Connector
(7)
VDC warning light and VDC OFF
indicator light
(12)
Yaw rate & lateral G sensor
(3)
Transmission control module (TCM)
(13)
Data link connector
(4)
Brake warning light (EBD warning
light)
(8)
Steering angle sensor
(14)
Engine control module (ECM)
(9)
VDC OFF switch
(15)
Stop light switch
VDC00469
(4) (5) (6)
(7)
(8)
(1)
(2)
(3)
(15)
(14)
(12)
(13)
(11)
(10)
(11)
(10)
(9)
VDC(diag)-10
Electrical Component Location
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
VDC00455
(1)
VDC00656
(5)
(4)
(6)
(7)
(8)
VDC00235
VDC00234
(11)
(10)
(10)
VDC00456
(12)
VDC00242
(13)
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