SUBARU LEGACY 1996 Service Repair Manual
Page 2611 of 2890
10AK7
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
271
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2612 of 2890
11. General Diagnostics Table
A: SYMPTOMS AND PROBABLE CAUSES
Symptom Probable faulty units/parts
Vehicle instability during brakingVehicle pulls to either side.Hydraulic unit (solenoid valve)
ABS sensor
Brake (caliper & piston, pads)
Wheel alignment
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Road surface (uneven, camber)
Vehicle spins.Hydraulic unit (solenoid valve)
ABS sensor
Brake (pads)
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Poor brakingLong braking/stopping distanceHydraulic unit (solenoid valve)
Brake (pads)
Air in brake line
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Wheel locks.Hydraulic unit (solenoid valve, motor)
ABS sensor
Incorrect wiring or piping connections
Brake draggingHydraulic unit (solenoid valve)
ABS sensor
Master cylinder
Brake (caliper & piston)
Parking brake
Axle & wheels
Brake pedal play
Long brake pedal strokeAir in brake line
Brake pedal play
Vehicle pitchingSuspension play or fatigue (reduced damping)
Incorrect wiring or piping connections
Road surface (uneven)
Unstable or uneven brakingHydraulic unit (solenoid valve)
ABS sensor
Brake (caliper & piston, pads)
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Road surface (uneven)
Vibration and/or noise (while
driving on slippery roads)Excessive pedal vibrationIncorrect wiring or piping connections
Road surface (uneven)
Noise from hydraulic unitHydraulic unit (mount bushing)
ABS sensor
Brake piping
Noise from front of vehicleHydraulic unit (mount bushing)
ABS sensor
Master cylinder
Brake (caliper & piston, pads, rotor)
Brake piping
Brake booster & check valve
Suspension play or fatigue
Noise from rear of vehicleABS sensor
Brake (caliper & piston, pads, rotor)
Parking brake
Brake piping
Suspension play or fatigue
272
4-4cBRAKES [ABS 5.3 TYPE]
11. General Diagnostics Table
Page 2613 of 2890
B: CHECKING THE HYDRAULIC UNIT
OPERATION
<Ref. to 4-4 [W22C1] or [W22C2].>
1) Do ABS sequence control patterns take place in correct
order?
If not, check wiring and piping for incorrect connections.
2) Are oil pressure or braking force variations within speci-
fications?
If not, check master cylinder, brake piping, hydraulic unit,
proportioning valve and wheel cylinder for improper opera-
tion.
3) Does pedal hardness change before and after ABS
sequence control?
If so, bleed air from brake line.
273
4-4cBRAKES [ABS 5.3 TYPE]
11. General Diagnostics Table
Page 2614 of 2890
1. Electrical Components Location
B5M0395A
Connector No. (AB1) (AB2) (AB3) (AB4) (AB5) (AB6) (AB7) (AB8) (AB9) (AB10)
Pole73322123333
Color Yellow Yellow Yellow Blue Orange Yellow Yellow Yellow Yellow Yellow
Male/Female Male Female Female Female Female Female Male Male Male Female
2
5-5SUPPLEMENTAL RESTRAINT SYSTEM
1. Electrical Components Location
Page 2615 of 2890
2. Schematic
B5M0111B
3
5-5SUPPLEMENTAL RESTRAINT SYSTEM
2. Schematic
Page 2616 of 2890
3. Tools for Diagnostics
CAUTION:
Be sure to use specified test harness A, B or C when
measuring voltage, resistance, etc. of AIRBAG system
component parts.
A: TEST HARNESS A
B5M0112A
4
5-5SUPPLEMENTAL RESTRAINT SYSTEM
3. Tools for Diagnostics
Page 2617 of 2890
B: TEST HARNESS B2
G5M0593
5
5-5SUPPLEMENTAL RESTRAINT SYSTEM
3. Tools for Diagnostics
Page 2618 of 2890
C: TEST HARNESS C
B5M0113A
6
5-5SUPPLEMENTAL RESTRAINT SYSTEM
3. Tools for Diagnostics
Page 2619 of 2890
D: AIRBAG RESISTOR
The airbag resistor is used during diagnostics. The airbag
resistor has the same resistance as the airbag module and
thus provides safety when used instead of the airbag mod-
ule. It also makes it possible to finish, diagnostics in less
time.
B5M0114A
7
5-5SUPPLEMENTAL RESTRAINT SYSTEM
3. Tools for Diagnostics
Page 2620 of 2890
4. Diagnostics Chart for On-board
Diagnostic System
A: BASIC DIAGNOSTICS PROCEDURE
8
5-5SUPPLEMENTAL RESTRAINT SYSTEM
4. Diagnostics Chart for On-board Diagnostic System