Subaru Impreza 2006 - Page 8

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:
• Airbag system connectors are colored yel-
low. Do not use the electrical 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 ABS ground (B302) bolt, tightening
torque.
Tightening torque:
13 N
⋅ m (1.3 kgf-m, 9.4 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-9, 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-8, 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-19, INSPECTION, Front
Brake Pad.> <Ref. to BR-21, INSPECTION, Front
Disc Rotor.>
• REAR <Ref. to BR-30, INSPECTION, Rear
Brake Pad.> <Ref. to BR-32, INSPECTION, Rear
Disc Rotor.>
7. TIRE
Check the tire specifications, tire wear and air pres-
sure. <Ref. to WT-2, SPECIFICATION, General
Description.>