Subaru Legacy III (2000-2003 year). Service manual — part 697
ABS-6
ABS (DIAGNOSTICS)
CHECK LIST FOR INTERVIEW
2. SYMPTOMS
ABS operating condi-
tion
❏
Performs no work.
❏
Operates only when abruptly applying brakes.
Vehicle speed :
km/h
MPH
• How to step on brake pedal :
a) Operating time :
sec
b) Operating noise :
❏
Produce /
❏
Does not produce
• What kind of noise?
❏
Knock
❏
Gong gong
❏
Bong
❏
Buzz
❏
Gong gong buzz
❏
Others :
c) Reaction force of brake pedal
❏
Stick
❏
Press down once with a clunk
❏
Press and released
❏
Others :
Behavior of vehicle
a) Directional stability cannot be obtained or steering arm refuses to work when applying brakes :
❏
Yes /
❏
No
• When :
❏
Vehicle turns to right
❏
Vehicle turns to left
❏
Spins
❏
Others :
b) Directional stability cannot be obtained or steering arm refuses to work when accelerating :
❏
Yes /
❏
No
• When :
❏
Vehicle turns to right
❏
Vehicle turns to left
❏
Spins
❏
Others :
c) Brakes are out of order :
❏
Yes /
❏
No
• What :
❏
Braking distance is long
❏
Brakes lock or drag
❏
Pedal stroke is long
❏
Pedal sticks
❏
Others :
d) Poor acceleration :
❏
Yes /
❏
No
• What :
❏
Fails to accelerate
❏
Engine stalls
❏
Others :
e) Occurrence of vibration :
❏
Yes /
❏
No
• Where
• What kind :
f) Occurrence of abnormal noise :
❏
Yes /
❏
No
• Where
• What kind :
g) Occurrence of other phenomena :
❏
Yes /
❏
No
• What kind :
ABS-7
ABS (DIAGNOSTICS)
CHECK LIST FOR INTERVIEW
3. CONDITIONS UNDER WHICH TROUBLE OCCURS
Environment
a) Weather
❏
Fine
❏
Cloudy
❏
Rainy
❏
Snowy
❏
Various/Others :
b) Ambient temperature
°
F (
°
C)
c) Road
❏
Urban area
❏
Suburbs
❏
Highway
❏
General road
❏
Ascending slope
❏
Descending slope
❏
Paved road
❏
Gravel road
❏
Muddy road
❏
Sandy place
❏
Others :
d) Road surface
❏
Dry
❏
Wet
❏
New-fallen snow
❏
Compressed snow
❏
Frozen slope
❏
Others :
Condition
a) Brakes
Deceleration :
g
❏
Continuous /
❏
Intermittent
b) Accelerator
Acceleration :
g
❏
Continuous /
❏
Intermittent
c) Vehicle speed
km/h
MPH
❏
Advancing
❏
Accelerating
❏
Reducing speed
❏
Low speed
❏
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) Genuine parts are used. :
❏
Yes /
❏
No
g) Chain is passed around tires. :
❏
Yes /
❏
No
h) T tire is used. :
❏
Yes /
❏
No
i) Condition of suspension alignment :
j) Loading state :
k) Repair parts are used. :
❏
Yes /
❏
No
• What :
l) Others :
ABS-8
ABS (DIAGNOSTICS)
GENERAL DESCRIPTION
3. General Description
A: CAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
“AIRBAG”
Airbag system wiring harness is routed near the
ABS sensor, ABS control module and hydraulic
control unit.
CAUTION:
• All airbag system wiring harness and con-
nectors are colored yellow. Do not use electri-
cal test equipment on these circuit.
• Be careful not to damage airbag system wir-
ing harness when servicing the ABS sensor,
ABS control module and hydraulic control unit.
B: INSPECTION
Before performing diagnostics, check the following
items which might affect ABS problems:
1. BATTERY
Measure battery voltage and specific gravity of
electrolyte.
Standard voltage: 12 V, or more
Specific gravity: Above 1.260
2. BRAKE FLUID
1) Check brake fluid level.
2) Check brake fluid leakage.
3. HYDRAULIC UNIT
Check the hydraulic unit.
• With brake tester <Ref. to ABS-8, CHECKING
THE HYDRAULIC UNIT ABS OPERATION WITH
BRAKE TESTER, INSPECTION, ABS Control
Module and Hydraulic Control Unit (ABSCM&H/
U).>
• Without brake tester <Ref. to ABS-7, CHECK-
ING THE HYDRAULIC UNIT ABS OPERATION
BY PRESSURE GAUGE, INSPECTION, ABS
Control Module and Hydraulic Control Unit (AB-
SCM&H/U).>
4. BRAKE DRAG
Check brake drag.
5. BRAKE PAD AND ROTOR
Check brake pad and rotor.
• Front <Ref. to BR-21, INSPECTION, Front
Brake Pad.> and <Ref. to BR-22, INSPECTION,
Front Disc Rotor.>
• Rear <Ref. to BR-26, INSPECTION, Rear Brake
Pad.> and <Ref. to BR-27, INSPECTION, Rear
Disc Rotor.>
6. TIRE
Check tire specifications, tire wear and air pres-
sure. <Ref. to WT-2, SPECIFICATIONS, General
Description.>
ABS-9
ABS (DIAGNOSTICS)
GENERAL DESCRIPTION
C: PREPARATION TOOL
1. SPECIAL TOOLS
2. GENERAL PURPOSE TOOLS
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
24082AA210
CARTRIDGE
Troubleshooting for electrical systems.
22771AA030
SELECT MONITOR
KIT
Troubleshooting for electrical systems.
• English: 22771AA030 (Without printer)
• German: 22771AA070 (Without printer)
• French: 22771AA080 (Without printer)
• Spanish: 22771AA090 (Without printer)
TOOL NAME
REMARKS
Circuit Tester
Used for measuring resistance, voltage and ampere.
Oscilloscope
Used for measuring sensor.
ST24082AA210
ST22771AA030
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