Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 527
VDC(diag)-7
Check List for Interview
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
4. STATE OF VDC OFF INDICATOR LIGHT
NOTE:
This check list for interview is applied to 5MT model.
VDC OFF indicator
light comes on.
Always
Sometimes
Only once
Does not illuminate
• When/How long does it illuminate?
Ignition key position
LOCK
ACC
ON (before starting engine)
START
ON (after starting engine, engine is running)
ON (after starting engine, engine is at a standstill)
Timing
Immediately after turning the ignition switch to ON
Immediately after turning the ignition switch to START
While accelerating
—
km/h
—
MPH
While driving at a constant speed
km/h
MPH
While decelerating
—
km/h
—
MPH
When turning to the right
Steering angle:
deg
Steering time:
Sec.
When turning to the left
Steering angle:
deg
Steering time:
Sec.
When other electrical parts are operating
• Part name:
• Operating condition:
VDC(diag)-8
Check List for Interview
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
5. CONDITIONS UNDER WHICH TROUBLE OCCURS
Environment
a) Weather
Fine
Cloudy
Rainy
Snowy
Others:
b) Ambient temperature
°C (°F)
c) Road
Inner city
Suburbs
Highway
Local street
Uphill
Downhill
Paved road
Gravel road
Muddy road
Sandy place
Straight road
Sharp curve
Gentle curve
S-curve
Road with a slope on both sides
Others:
d) Road surface
Dry
Wet
Covered with fresh snow
Covered with hardened snow
Frozen slope
Others:
VDC(diag)-9
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
When 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:
mm (in)
Front LH tire:
mm (in)
Rear RH tire:
mm (in)
Rear LH tire:
mm (in)
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) Using T-type tires:
Yes /
No
k) Condition of suspension alignment:
l) Load condition:
m) Repaired parts are used:
Yes /
No
• Content:
n) Others:
VDC(diag)-10
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:
• Do not use electrical test equipment on wir-
ing harness and connector circuits of the air-
bag system.
• 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 the ground bolt for
VDC.
3. BRAKE FLUID
1) Check the brake fluid level.
2) Check the brake fluid for leaks.
4. HYDRAULIC UNIT
Check the hydraulic unit.
• When using the brake tester <Ref. to VDC-10,
CHECKING THE HYDRAULIC UNIT ABS OPERA-
TION WITH THE BRAKE TESTER, INSPECTION,
VDC Control Module and Hydraulic Control Unit
• When not using the brake tester <Ref. to VDC-9,
CHECKING THE HYDRAULIC UNIT ABS OPERA-
TION BY PRESSURE GAUGE, INSPECTION,
VDC Control Module and Hydraulic Control Unit
5. BRAKE DRAG
Check for brake drag.
6. BRAKE PAD AND ROTOR
Check the brake pad and rotor.
• Front <Ref. to BR-16, INSPECTION, Front Brake
Pad.> <Ref. to BR-17, INSPECTION, Front Disc
• Rear <Ref. to BR-26, INSPECTION, Rear Brake
Pad.> <Ref. to BR-28, INSPECTION, Rear Disc
7. TIRES
Check the tire specifications, tire wear and air pres-
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