Subaru IMPREZA GD 2007 Series Manual page 3137

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ABS (DIAGNOSTICS)
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 wiring harnesses and connec-
tors are yellow. Do not use electrical test equip-
ment 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
item which might affect ABS 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 ground (B302) bolt
of ABS.
Tightening torque:
13 N·m (1.3 kgf-m, 9.4 ft-lb)
C: PREPARATION TOOL
1. SPECIAL TOOL
ILLUSTRATION
ST1B020XU0
2. GENERAL TOOL
TOOL NAME
Circuit tester
Oscilloscope
General Description
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 ABS-9,
CHECKING THE HYDRAULIC UNIT ABS OPERA-
TION WITH THE BRAKE TESTER, INSPECTION,
ABS Control Module and Hydraulic Control Unit
(ABSCM&H/U).>
• When not using the brake tester <Ref. to ABS-8,
CHECKING THE HYDRAULIC UNIT ABS OPERA-
TION BY PRESSURE GAUGE, INSPECTION,
ABS Control Module and Hydraulic Control Unit
(ABSCM&H/U).>
5. BRAKE DRAG
Check for brake drag.
6. BRAKE PAD AND ROTOR
Check the brake pad and rotor.
• Front <Ref. to BR-20, INSPECTION, Front Brake
Pad.> <Ref. to BR-22, INSPECTION, Front Disc
Rotor.>
• Rear <Ref. to BR-31, 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.>
TOOL NUMBER DESCRIPTION
1B020XU0 SUBARU SELECT
MONITOR KIT
Used for measuring resistance, voltage and current.
Used for measuring the sensor.
ABS(diag)-8
REMARKS
Used for troubleshooting the electrical system.
REMARKS