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![SUBARU LEGACY 1997 Service Repair Manual 10AJ5CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connector between
ABSCM&H/U and G sensor? <Ref. to FORE-
WORD [T3C1].>
: Repair connector.
: Go to step SUBARU LEGACY 1997 Service Repair Manual 10AJ5CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connector between
ABSCM&H/U and G sensor? <Ref. to FORE-
WORD [T3C1].>
: Repair connector.
: Go to step](/manual-img/17/57434/w960_57434-3056.png)
10AJ5CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connector between
ABSCM&H/U and G sensor?
WORD [T3C1].>
: Repair connector.
: Go to step10AJ6.
10AJ6
CHECK ABSCM&H/U.
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&H/U.
: Go to step10AJ7.
10AJ7CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
B4M1261A
10AJ8CHECK OPEN CIRCUIT IN G SENSOR
OUTPUT HARNESS AND GROUND HAR-
NESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Measure resistance between ABSCM&H/U connector
terminals.
Connector & terminal
(F49) No. 30—No. 28:
: Is the resistance between 4.3 and 4.9 kΩ?
: Go to step10AJ9.
: Repair harness/connector between G sensor and
ABSCM&H/U.
181
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor
Page 3058 of 3342
B4M0915
10AJ9
CHECK G SENSOR.
1) Remove console box.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Connect connector to ABSCM&H/U.
5) Turn ignition switch to ON.
6) Measure voltage between G sensor connector termi-
nals.
Connector & terminal
(P11) No. 2 (+)—No.1( ):
: Is the voltage between 2.1 and 2.5 V when G
sensor is horizontal?
: Go to step10AJ10.
: Replace G sensor.
B4M0917A
10AJ10
CHECK G SENSOR.
Measure voltage between G sensor connector terminals.
Connector & terminal
(P11) No. 2 (+)—No.1( ):
: Is the voltage between 3.7 and 4.1 V when G
sensor is inclined forwards to 90°?
: Go to step10AJ11.
: Replace G sensor.
B4M0918A
10AJ11
CHECK G SENSOR.
Measure voltage between G sensor connector terminals.
Connector & terminal
(P11) No. 2 (+)—No.1( ):
: Is the voltage between 0.5 and 0.9 V when G
sensor is inclined backwards to 90°?
: Go to step10AJ12.
: Replace G sensor.
182
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor
Page 3059 of 3342
10AJ12
CHECK ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM&H/U.
: Go to step10AJ13.
10AJ13CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
183
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor
Page 3060 of 3342

11. General Diagnostics Table
A: SYMPTOMS AND PROBABLE CAUSES
Symptom Probable faulty units/parts
Vehicle instability during brakingVehicle pulls to either side.ABSCM&H/U (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.ABSCM&H/U (solenoid valve)
ABS sensor
Brake (pads)
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Poor brakingLong braking/stopping distanceABSCM&H/U (solenoid valve)
Brake (pads)
Air in brake line
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Wheel locks.ABSCM&H/U (solenoid valve, motor)
ABS sensor
Incorrect wiring or piping connections
Brake draggingABSCM&H/U (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 brakingABSCM&H/U (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 ABSCM&H/UABSCM&H/U (mount bushing)
ABS sensor
Brake piping
Noise from front of vehicleABSCM & H/U (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
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4-4dBRAKES [ABS 5.3i TYPE]
11. General Diagnostics Table
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B: CHECKING THE HYDRAULIC UNIT
OPERATION
11B1
PREPARING THE BRAKE TESTER.
: Is the brake tester available?
: CHECKING THE HYDRAULIC UNIT ABS
OPERATION WITH BRAKE TESTER
[W20C2].>
: CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
4-4 [W20C1].>
185
4-4dBRAKES [ABS 5.3i TYPE]
11. General Diagnostics Table
Page 3062 of 3342
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 3063 of 3342
2. Schematic
B5M0111B
3
5-5SUPPLEMENTAL RESTRAINT SYSTEM
2. Schematic
Page 3064 of 3342
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