Subaru Legacy (2005 year). Service manual — part 760
ABS(diag)-5
ABS (DIAGNOSTICS)
Check List for Interview
2. STATE OF BRAKE WARNING LIGHT
Brake warning light
comes on.
❏ Always
❏ Sometimes
❏ Only once
❏ Not come on
❏ When pulling the parking brake lever up.
❏ When releasing the parking brake lever down.
• When / how long does it come on?
Ignition key position
❏ LOCK
❏ ACC
❏ ON (before starting engine)
❏ START
❏ ON (after Engine starting, engine is running)
❏ ON (after Engine starting, engine is at a standstill)
Timing
❏ Immediately after turning the ignition to ON
❏ Immediately after turning the ignition to START
❏ When accelerating
—
km/h
—
MPH
❏ When driving at a constant speed
km/h
MPH
❏ When 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 operating other electrical parts
• Parts name:
• Operating condition:
ABS(diag)-6
ABS (DIAGNOSTICS)
Check List for Interview
3. SYMPTOMS
ABS operating condi-
tion
❏ Does not move.
❏ Operates only when applying an abrupt brake.
Vehicle speed:
km/h
MPH
• How to step on brake pedal:
a) Operating time:
Sec.
b) Operating noise:
❏ Occurs. / ❏ Does not occur.
• What kind of noise?
❏ Knocking
❏ Gong gong
❏ Bong
❏ Buzz
❏ Gong gong buzz
❏ Others:
c) Reaction force of brake pedal
❏ Stick
❏ Weak pedal resistance
❏ Strong pedal resistance
❏ Others:
Behavior of vehicle
a) Directional stability cannot be obtained or the steering refuses to work when applying brakes:
❏ Yes / ❏ No
• When:
❏ When turning to the right
❏ When turning to the left
❏ When spinning
❏ Others:
b) Directional stability cannot be obtained or the steering refuses to work when accelerating:
❏ Yes / ❏ No
• When:
❏ When turning to the right
❏ When turning to the left
❏ When spinning
❏ Others:
c) Poor brake performance:
❏ Yes / ❏ No
• What kind:
❏ Long braking/stopping distance
❏ Brakes lock or drag
❏ Long pedal stroke
❏ Pedal sticks.
❏ Others:
d) Poor acceleration:
❏ Yes / ❏ No
• What kind:
❏ Not accelerate
❏ Engine stalls.
❏ Others:
e) Occurrence of vibration:
❏ Yes / ❏ No
• Where
• What kind:
f) Occurrence of noise:
❏ Yes / ❏ No
• Where
• What kind:
g) Other troubles occurred:
❏ Yes / ❏ No
• What kind:
ABS(diag)-7
ABS (DIAGNOSTICS)
Check List for Interview
4. 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
❏ Others:
d) Road surface
❏ Dried
❏ Wet
❏ Covered with fresh snow
❏ Covered with hardened snow
❏ Frozen slope
❏ Others:
Condition
a) Brakes
Deceleration:
G
❏ Intermittent / ❏ Temporary
b) Accelerator
Acceleration:
G
❏ Intermittent / ❏ Temporary
c) Vehicle speed
km/h
MPH
❏ Advancing
❏ When accelerating
❏ When 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) Genuine parts are used.:
❏ Yes / ❏ No
g) Tire chain is attached.:
❏ Yes / ❏ No
h) T-type tire is used.:
❏ Yes / ❏ No
i) Condition of suspension alignment:
j) Loading state:
k) Repair parts are used.:
❏ Yes / ❏ No
• Contents:
l) Others:
ABS(diag)-8
ABS (DIAGNOSTICS)
General Description
3. General Description
A: CAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
“AIRBAG”
Airbag system wiring harness is routed near the
ABS wheel speed sensor and ABSCM&H/U.
CAUTION:
• All airbag system wiring harness and con-
nectors are colored yellow. Do not use the elec-
trical test equipment on these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the ABS wheel
speed sensor and ABSCM&H/U.
B: INSPECTION
Before performing diagnosis, check the following
items which might affect ABS problems.
1. BATTERY
Measure battery voltage and check electrolyte.
Standard voltage: 12 V or more
Specific gravity: More than 1.260
2. GROUND
Check the tightening torque of ABS ground (GB-7)
bolt.
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 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).>
5. BRAKE DRAG
Check for brake drag.
6. BRAKE PAD AND ROTOR
Check the brake pad and rotor.
• FRONT <Ref. to BR-18, INSPECTION, Front
Brake Pad.> <Ref. to BR-19, INSPECTION, Front
Disc Rotor.>
• REAR <Ref. to BR-25, INSPECTION, Rear
Brake Pad.> <Ref. to BR-26, INSPECTION, Rear
Disc Rotor.>
7. TIRE
Check the tire specifications, tire wear and air pres-
sure. <Ref. to WT-2, SPECIFICATION, General
Description.>
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