1997 SUBARU LEGACY ignition

B4M1031A
2) Secure relay box connector to connector bracket.
CAUTION:
Align connector wit mating receptacle.
3) Using cable clip, secure hydraulic unit harness to relay
box harness.
CAUTION:
Make sure hydraulic unit harness band is secured
beneath cable clip.
4) Connect connector to relay box.
5) Install canister.
6) Install air intake duct.
7) Connect ground cable to battery.
B4M1002
16. ABS Control Module (ABS 5.3 Type)
A: REMOVAL
1. LHD MODEL
1) Turn ignition switch to OFF.
2) Remove front pillar lower trim.
3) Remove glove box.
4) Remove glove box bracket.
B4M1003
5) Remove pocket back panel.
B4M1004
6) Remove bolt from bracket.
88
4-4SERVICE PROCEDURE
15. Hydraulic Unit for ABS System (ABS 5.3 Type) - 16. ABS Control Module (ABS 5.3 Type)

B: INSPECTION
Check that connector is connected correctly and that con-
nector terminal sliding resistance is correct.
C: INSTALLATION
To install, reverse the removal procedure.
17. G Sensor for ABS System (ABS 5.3
Type)
A: REMOVAL AND INSTALLATION
1) Turn ignition switch to OFF.
2) Remove console box.
3) Disconnect connector form G sensor.
B4M1011
4) Remove G sensor from body.
5) To install, reverse the removal procedure.
CAUTION:
Do not drop or bump G sensor.
B4M0915
B: INSPECTION
1. USING CIRCUIT TESTER
1) Turn ignition switch to OFF.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Turn ignition switch to ON.
5) Measure voltage between G sensor connector termi-
nals.
: Connector & terminal
(P9) No. 2 (+)—No.1()
Is voltage 2.3±0.2 V when G sensor is hori-
zontal?
: Go to next.
: Replace G sensor.
90
4-4SERVICE PROCEDURE
16. ABS Control Module (ABS 5.3 Type) - 17. G Sensor for ABS System (ABS 5.3 Type)

B: INSPECTION
Check that connector is connected correctly and that con-
nector terminal sliding resistance is correct.
C: INSTALLATION
To install, reverse the removal procedure.
17. G Sensor for ABS System (ABS 5.3
Type)
A: REMOVAL AND INSTALLATION
1) Turn ignition switch to OFF.
2) Remove console box.
3) Disconnect connector form G sensor.
B4M1011
4) Remove G sensor from body.
5) To install, reverse the removal procedure.
CAUTION:
Do not drop or bump G sensor.
B4M0915
B: INSPECTION
1. USING CIRCUIT TESTER
1) Turn ignition switch to OFF.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Turn ignition switch to ON.
5) Measure voltage between G sensor connector termi-
nals.
: Connector & terminal
(P9) No. 2 (+)—No.1()
Is voltage 2.3±0.2 V when G sensor is hori-
zontal?
: Go to next.
: Replace G sensor.
90
4-4SERVICE PROCEDURE
16. ABS Control Module (ABS 5.3 Type) - 17. G Sensor for ABS System (ABS 5.3 Type)

B4M0917A
: Connector & terminal
(P9) No. 2 (+)—No.1()
Is voltage 3.9±0.2 V when G sensor is
inclined forwards to 90°?
: Go to next.
: Replace G sensor.
B4M0918A
: Connector & terminal
(P9) No. 2 (+)—No.1()
Is voltage 0.7±0.2 V when G sensor is
inclined backwards to 90°?
: G sensor is normal.
: Replace G sensor.
2. USING SELECT MONITOR
1) Turn ignition switch to OFF.
2) Connect select monitor connector to data link connec-
tor.
3) Turn select monitor into ABS mode.
B4M0927
4) Press F,1and 0on the select monitor.
5) Rear the select monitor display.
: Is the indicated reading 2.3±0.2 V when the
vehicle is in horizontal position?
: Go to next step 6).
: Replace G sensor.
6) Remove console box.
7) Remove G sensor from vehicle. (Do not disconnect
connector.)
B4M0917A
8) Read the select monitor display.
: Is the indicated reading 3.9±0.2 V when G
sensor is inclined forwards to 90°?
: Go to next.
: Replace G sensor.
91
4-4SERVICE PROCEDURE
17. G Sensor for ABS System (ABS 5.3 Type)

11) Operate FRO (Front Right Outlet) valve and RLO
(Rear Left Outlet) valve to bleed air from hydraulic unit
outlet circuit.
(1) Press TCS OFF switch while depressing brake
pedal.
(2) Make sure ABS warning light illuminates.
(3) Repeatedly depress and release brake pedal 10
times or more while pressing TCS OFF switch.
NOTE:

Air comes out from reservoir tank.
12) Operate FLO (Front Left Outlet) valve and RRO (Rear
Right Outlet) valve to bleed air from hydraulic unit outlet
circuit.
(1) Press TCS OFF switch while depressing brake
pedal.
(2) Make sure TCS warning light illuminates.
(3) Repeatedly depress and release brake pedal 10
times or more while pressing TCS OFF switch.
NOTE:

Air comes out from reservoir tank.

The operations in steps 11) and 12) above can be
switched with each other by operating brake pedal (stop
light switch) while pressing TCS OFF switch.

Repeat procedures 11) and 12) until air no longer comes
out of reservoir tank.
13) Perform these steps for the brakes connecting to the
secondary chamber of master cylinder, first, and then for
the ones connecting to primary chamber. With all proce-
dures completed, fully depress the brake pedal and keep
it in that position for approximately 20 seconds to make
sure that there is no leak evident in the entire system.
14) Turn ignition switch OFF.
15) Perform TCS sequence control. [W20F0].>
100
4-4SERVICE PROCEDURE
19. Air Bleeding (With TCS model)

G4M0436
16) Check the pedal stroke.
While the engine is idling, depress the brake pedal with a
490 N (50 kg, 110 lb) load and measure the distance
between the brake pedal and steering wheel. With the
brake pedal released, measure the distance between the
pedal and steering wheel again. The difference between
the two measurements must be less than specified.
Specified pedal stroke:
With TCS
95 mm (3.74 in)
When depressing brake pedal with a 490 N (50 kg,
110 lb) load.
If the distance is more than specifications, there is a
possibility that air is in the brake line. Bleed air from the
brake line.
17) Turn ignition switch OFF.
18) Disconnect select monitor or diagnosis terminal.
19) Add brake fluid to the required level (MAX. level) of
reserve tank.
20) As a final step, test run the vehicle at low speed and
apply brakes relatively hard 2 to 3 times to ensure that
brakes provide normal braking action on all four wheels
without dragging and uneven braking.
2. CONDITIONS FOR AIR BLEEDING CONTROL
Stop light
switchTCS OFF
switchPump
motorTCS
valveFRO
RLOFLO
RROTCS
operating
indicator
lightABS
warning
lightTCS
warning
light
Air
bleeding
control is
operating.OFF ON ON Close Close Close ON ON ON
ON ON OFF Open Open Close ON ON OFF
ON ON OFF Open Close Open ON OFF ON
ON or OFF OFF OFF Open Close Close ON OFF OFF
Stops tem-
porarily.*——OFF Open Close Close OFF OFF OFF
Prohibited.——OFF Open Close Close OFF ON ON
*: When brake fluid level switch detects brake fluid in LOW level, control operation stops temporarily. After refilling brake fluid, operation
re-starts.
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4-4SERVICE PROCEDURE
19. Air Bleeding (With TCS model)

D: ABS SEQUENCE CONTROL
1) Under the ABS sequence control, after the hydraulic
unit solenoid valve is driven, the operation of the hydraulic
unit can be checked by means of the brake tester or pres-
sure gauge.
2) ABS sequence control can be started by diagnosis con-
nector or select monitor.
B4M0082C
1. OPERATIONAL GUIDELINES OF THE ABS
SEQUENCE CONTROL WITH DIAGNOSIS
CONNECTOR
1) Connect diagnosis terminals to terminal No. 4 of the
diagnosis connector beside driver’s seat heater unit.
2) Ignition switch is turned to ON.
3) Make sure only the start code (code 11) is shown in
normal condition.
NOTE:
When trouble codes are stored in memory, repair the faulty
parts.
4) Set the speed of all wheels at 10 km/h (6 MPH) or less.
5) Turn ignition switch OFF.
6) Within 0.5 seconds after the ABS and TCS warning
lights go out, depress the brake pedal and hold it immedi-
ately after engine starts.
NOTE:

When the ignition switch is set to on, the brake pedal
must not be depressed.

Engine must operate.

If brake pedal is not depressed within 0.5 seconds after
ABS and TCS warning lights go out, the trouble code mode
comes on.
7) After completion of ABS sequence control, turn ignition
switch OFF.
2. OPERATIONAL GUIDELINES OF THE ABS
SEQUENCE CONTROL WITH SELECT MONITOR
1) Connect select monitor to data link connector beside
driver’s seat heater unit.
2) Engine starts.
3) Put select monitor to TCS mode.
4) put select monitor to FBI mode. Make sure code 11 is
indicated.
NOTE:
When trouble codes are stored in memory, repair the faulty
parts.
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4-4SERVICE PROCEDURE
20. Hydraulic Unit for ABS/TCS System

B4M0635
4) Press FD1 ENT key.
B4M0634
5) The message shown in the figure is displayed as fol-
lows:
(1) When using the brake tester, depress brake pedal
with braking force of 981 to 1,471 N (100 to 150 kg, 221
to 331 lb).
(2) When using the pressure gauge, depress brake
pedal so as to make the pressure gauge indicate 3,432
kPa (35 kg/cm
2, 498 psi)
B4M0624
6) When the message shown in the figure is displayed,
press ENT key.
7) Checked portions will be displayed on select monitor.
B4M0627
8) When ABS sequence control cannot be started (by sys-
tem malfunction, etc.), the message shown in the figure will
be displayed.
NOTE:
Read the trouble codes. Repair faulty parts.
9) After completion of ABS sequence control, turn ignition
switch OFF.
11 0
4-4SERVICE PROCEDURE
20. Hydraulic Unit for ABS/TCS System