General Description - Subaru Forester 2004 Service Manual

ABS (DIAGNOSTIC)

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 electri-
cal test equipment on these circuit.
• Be careful not to damage the Airbag system
wiring harness when servicing the ABS wheel
speed sensor and ABSCM&H/U.
General Description
B: INSPECTION
Before performing diagnostics, check the following
items which might affect ABS problems:
1. BATTERY
Measure the battery voltage and check electrolyte.
Standard voltage: 12 V or more
Specific gravity: More than 1.260
2. BRAKE FLUID
1) Check the brake fluid level.
2) Check the brake fluid leakage.
3. HYDRAULIC UNIT
Check the hydraulic unit.
• With brake tester <Ref. to ABS-10, 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-9, 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 for brake drag.
5. BRAKE PAD AND ROTOR
Check the brake pad and rotor.
• Front <Ref. to BR-19, INSPECTION, Front Brake
Pad.> <Ref. to BR-20, INSPECTION, Front Disc
Rotor.>
• Rear <Ref. to BR-24, INSPECTION, Rear Brake
Pad.> <Ref. to BR-25, INSPECTION, Rear Disc
Rotor.> or <Ref. to BR-30, INSPECTION, Rear
Drum Brake Shoe.> <Ref. to BR-31, INSPECTION,
Rear Drum Brake Drum.>
6. TIRE
Check the tire specifications, tire wear and air pres-
sure. <Ref. to WT-2, SPECIFICATION, General
Description.>
ABS-10