Control system SUZUKI SWIFT 2008 2.G Service Workshop Manual

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5) Apply small amount of rubber grease (included in spare parts) to mating surface of “a” (piston cup (3)
and piston guide (1)) and “b” piston guide (1) and O-
ring (2)).
6) Apply small amount of s ilicon grease (included in
spare parts) to mating surfaces of “c” (rod seal (4)
and primary piston (5)).
7) Install piston guide (1) and circlip (6).Master Cylinder Assembly InspectionS7RS0B4106014
Inspect all disassembled parts for wear or damage, and
replace parts if necessary.
NOTE
• Wash disassembled parts with brake fluid.
• Do not reuse inner parts and rubber parts.

Inspect master cylinder bore for scoring or corrosion. It is
best to replace corroded cylinder. Corrosion can be
identified as pits or excessive roughness.
NOTE
Polishing bore of master cylinder with cast
aluminium body with anything abrasive is
prohibited, as damage to cylinder bore may
occur.

Rinse cylinder in clean brake fluid. Shake excess rinsing
fluid from cylinder. Do not use a cloth to dry cylinder, as
lint from cloth cannot be kept from cylinder bore
surfaces.
Brake Booster ComponentsS7RS0B4106015
CAUTION!
Never disassemble brake booster. Disassembly will spoi l its original function. If faulty condition is
found, replace it with new one.

I4RS0A410024-01
9
10 17
4
8
5
6
3
(b)
(a)
(b)
2
I6RS0C410010-01
1. Booster assembly 5. Clip 9. Brake master cylinder : Do not reuse.
2. Gasket 6. Booster nut 10. Master cylinder fixing nut
3. Brake vacuum hose 7. Clevis pin lock nut : Tighten 13 N⋅m (1.3 kgf-m, 9.5 lb-ft)
by the specified procedure.
4. Clevis pin 8. Push rod clevis : 15 N⋅m (1.5 kgf-m, 11.0 lb-ft)

Downloaded from www.Manualslib.com manuals search engine 4A-16 Brake Control System and Diagnosis:
Booster Operation InspectionS7RS0B4106016
There are two ways to perform this inspection, with and
without a tester. Ordinarily, it is possible to roughly
determine its condition without using a tester.
NOTE
For this check, make su re that no air is in
hydraulic line.

Check Air Tightness
1) Start engine.
2) Stop engine after running for 1 to 2 minutes.
3) Depress brake pedal several times with the same load as in ordinary braking and observe pedal travel.
If pedal goes down deep the first time but its travel
decreases as it is depressed the second and more
times, air tightness is obtained.
4) If pedal travel doesn’t change, air tightness isn’t obtained.
NOTE
If defective, inspect vacuum lines and sealing
parts, and replace any faulty part. When this
has been done, repeat the entire test.

Check Operation
1) With engine stopped, depress brake pedal several times with the same load and make sure that pedal
travel doesn’t change.
2) Start engine while depressing brake pedal. If pedal travel increases a little, operation is satisfactory. But
no change in pedal travel indicates malfunction.
Check Air Tightness Under Load 1) With engine running, depress brake pedal. Then stop engine while holding brake pedal depressed.
1. 1st 2. 2nd3. 3rd
1. 1st, 2nd, 3rd
I2RH01410005-01
I2RH01410006-01
H: Hold
I2RH01410007-01
I2RH01410008-01
I2RH01410009-01

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2) Hold brake pedal depressed for 30 seconds. If pedal height does not change, condition is good. But it isn’t
if pedal rises.
Brake Booster Removal and InstallationS7RS0B4106017
Removal
1) Recover refrigerant from A/C system by using recovery and recycling equipment referring to
“Operation Procedure for Refrigerant Charge in
Section 7B” or “Operation Procedure for Refrigerant
Charge in Section 7B”.
2) Remove master cylinder assembly from booster referring to “Master Cylin der Assembly Removal and
Installation”.
3) Remove cowl top cover and cowl top panel referring to “Cowl Top Components in Section 9K”.
4) Remove suction hose referring to “Major Components of A/C System in Section 7B” or “Major
Components of A/C System in Section 7B”.
5) Disconnect vacuum hose from booster referring to “Brake Booster Components”.
6) Remove push rod clevis pin and booster mounting nuts and then remove booster. Installation
1) Loosen brake pedal bracket mounting bolt.
2) Install booster (2) to dash panel. Then connect push rod clevis (3) to pedal arm with clevis pin (1) and clip
(4).
3) Tighten booster mounting nuts (a) to specified torque.
Tightening torque
Booster mounting nut (a): 13 N·m (1.3 kgf-m, 9.5
lb-ft)
4) Tighten brake pedal bracket mounting bolt to specified torque.
Tightening torque
Brake pedal bracket mounting bolt (b): 13 N·m (
1.3 kgf-m, 9.5 lb-ft)
5) Install suction hose referring to “Major Components of A/C System in Section 7B” or “Major Components
of A/C System in Section 7B”.
6) Install cowl top panel and cowl top cover referring to
“Cowl Top Components in Section 9K”.
7) Install master cylinder assembly to booster referring to “Master Cylinder Assembly Removal and
Installation”.
8) Fill reservoir with specified fluid.
9) Bleed air from brake system.
H: Hold
T: 30 seconds
I2RH01410010-01
1
2 4
3
I6RS0C410006-02
(b)
(a)
I4RS0B410021-02

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10) Check pedal height and play referring to “Brake Pedal Free Height Inspection” and “Brake Pedal
Play Inspection”.
11) Check each installed part for fluid leakage and perform brake test.
12) Evacuate and charge refrigerant by referring to “Evacuating of A/C Syst em” and “Procedure of
Charging” under “Operation Procedure for
Refrigerant Charge in Section 7B” or “Operation
Procedure for Refrigerant Charge in Section 7B”.
Brake Booster Inspection and AdjustmentS7RS0B4106018
Installation Position of Push Rod
If push rod clevis (1) has b een removed, adjust distance
between booster installation surface (without including
packing) and the center of clevis pin hole to standard
value “a” and tighten nut (a) to specified torque. Distance “a” between center of booster clevis pin
hole and booster surface
Standard:
114.5 – 115.5 mm (4.51 – 4.54 in.)
Tightening torque
Clevis lock nut (a): 15 N·m (1.5 kgf-m, 11.0 lb-ft)
Specifications
Tightening Torque SpecificationsS7RS0B4107001
NOTE
The specified tightening torque is also described in the following.
“Front Brake Hose / Pipe Construction”
“Rear Brake Hose / Pipe Construction”
“Brake Pedal Components”
“Master Cylinder Components”
“Brake Booster Components”

Reference:
For the tightening torque of fastener not specified in this
section, refer to “Fasteners Information in Section 0A”.
Special Tools and Equipment
Recommended Service MaterialS7RS0B4108001
NOTE
Required service material is also described in the following.
“Master Cylinder Components”

I4RS0A410022-01
Fastening part Tightening torque
Note
N ⋅mkgf-mlb-ft
Master cylinder fixing nut 15 1.5 11.0 )
Brake pipe flare nut for M10 16 1.6 11.5 )
Brake pipe flare nut for M12 19 1.9 14.0 )
Reservoir bolt 2.5 0.25 2.0 )
Booster mounting nut 13 1.3 9.5 )
Brake pedal bracket mounting bolt 13 1.3 9.5 )
Clevis lock nut 15 1.5 11.0 )

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General Description
ABS DescriptionS7RS0B4501001
The ABS (Antilock Brake System) controls the fluid
pressure applied to the wheel cylinder of each brake
from the master cylinder so that each wheel is not locked
even when hard braking is applied.
This ABS has also the following function.
While braking is applied, but before ABS control
becomes effective, braking force is distributed between
the front and rear so as to prevent the rear wheels from
being locked too early for better stability of the vehicle.
The main component parts of this ABS include the
following parts in addition to those of the conventional
brake system.
• Wheel speed sensor which senses revolution speed of each wheel and outputs its signal.
• ABS warning light which light s to inform abnormality
when system fails to operate properly.
• ABS hydraulic unit / cont rol module assembly is
incorporated ABS co ntrol module, ABS hydraulic unit
(actuator assembly), solenoid valve power supply
driver (transistor), solenoid valve driver (transistor),
pump motor driver (transistor).
– ABS control module which sends operation signal to ABS hydraulic unit to control fluid pressure
applied to each wheel cylinder based on signal
from each wheel speed sensor so as to prevent
wheel from locking.
– ABS hydraulic unit which operates according to signal from ABS control module to control fluid
pressure applied to wheel cylinder of each 4
wheels.
– Solenoid valve power supp ly driver (transistor)
which supplies power to solenoid valve in ABS
hydraulic unit.
– Solenoid valve driver (transistor) which controls each solenoid valves in ABS hydraulic unit.
– Pump motor driver (transistor) which supplies power to pump motor in ABS hydraulic unit.
This ABS is equipped with Electronic Brake force
Distribution (EBD) system that controls a fluid pressure
of rear wheels to best condition, which is the same
function as that of proportion ing valve, by the signal from
wheel sensor independently of change of load due to
load capacity and so on. An d if the EBD system fails to
operate properly, the brake warning light lights to inform
abnormality.
ABS Hydraulic Unit / Control Module Assembly
Description
S7RS0B4501002
ABS control module is a component of ABS hydraulic
unit / control module asse mbly and has the following
functions.
Self-Diagnosis Function
ABS control module diagnose s conditions of the system
component parts (whether or not there is any
abnormality) all the time and indicates the results
(warning of abnormality occurrence and DTC) through
the ABS warning light as described.
• When ignition switch is turned ON, ABS warning light lights for 2 seconds to check its circuit.
• When no abnormality has been detected (the system is in good condition), ABS warning light turns OFF
after 2 seconds.
• When an abnormality in th e system is detected, ABS
warning light lights and the area where that
abnormality lies is stored in the memory of EEPROM
in ABS control module.
1
I4RS0A450001-01

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CAN Communication System DescriptionS7RS0B4501003
Refer to “CAN Communication System Description in Section 1A” for CAN communication system description.
ABS communicates control data with each control module as follows.
ABS Transmission Data
ABS Reception Data
Combination
meter
Transmit DATA
ABS control
moduleECM
Torque request
Wheel speed signal (front right)
Wheel speed signal (front left)
Wheel speed signal (rear right)
Wheel speed signal (rear left)
ABS active
ABS indication on
EBD indication on
I6RS0C450001-01
ABS control moduleDATA
Receive
ECM
Brake pedal switch signal
I6RS0C450002-01

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Problem symptom confirmation
Check if what the customer claimed in “Customer
Questionnaire” is actually found in the vehicle and if that
symptom is found, whether it is identified as a failure.
(This step should be shared with the customer if
possible.) Check warning lights related to brake system
referring to “EBD Warning Light (Brake Warning Light)
Check” and “ABS Warning Light Check”.
DTC check, record and clearance
Perform “DTC Check” proced ure, record it and then
clear it referring to “DTC Clearance”.
Recheck DTC referring to “DTC Check”.
When DTC which is recorded at DTC check procedure is
detected again after performi ng DTC clearance, go to
“Step 4: ABS Check: ” to proceed the diagnosis.
When DTC which is recorded at DTC check procedure is
not indicated anymore after performing DTC clearance,
ABS control module does not perform the system
diagnosis, or temporary abnormality may occur,
therefore go to “Step 2: Driving Test: ” to proceed the
diagnosis.
Step 2: Driving Test
Test drive the vehicle at 40 km/h for more than a minute
and check if any trouble symptom (such as abnormal
lighting of ABS warn ing light) exists.
If the malfunction DTC is co nfirmed again at ignition
switch ON, driving test as described is not necessary.
Proceed to Step 3.
Step 3: DTC Check
Recheck DTC referring to “DTC Check”.
Step 4: ABS Check
According to ABS Check for the DTC confirmation in
Step 3, locate the cause of the trouble, namely in a
sensor, switch, wire harness, connector, actuator
assembly or other part and repair or replace faulty parts.
Step 5: Brakes Diagnosis
Check the parts or system suspected as a possible
cause referring to “Brakes Symptom Diagnosis in
Section 4A” and based on symptoms appearing on the
vehicle (symptom obtained through Steps 1 and 2 and
repair or replace faulty parts, if any).
Step 6: Check for Intermittent Problem
Check parts where an intermittent trouble is easy to
occur (e.g., wire harness, con nector, etc.), referring to
“Intermittent and Poor Connection Inspection in Section
00” and related circuit of trouble code recorded in Step 1
to 3.
Step 7: Final Confirmation Test
Confirm that the problem symptom has gone and the
ABS is free from any abnormal conditions. If what has
been repaired is related to the malfunction DTC, clear
the DTC once referring to “DTC Clearance” and perform
test driving and confirm that no DTC is indicated.ABS Warning Light CheckS7RS0B4504002
1) Turn ignition switch ON.
2) Check that ABS warning light (1) comes ON for
about 2 seconds and then goes off.
If any faulty condition is found, advance to “ABS
Warning Light Does Not Come ON at Ignition Switch
ON” or “ABS Warning Light Comes ON Steady”.
EBD Warning Light (Brake Warning Light)
Check
S7RS0B4504003
NOTE
Perform this check on a level place.

1) Turn ignition switch ON with parking brake applied.
2) Check that EBD warning lig ht (brake warning light)
(1) is turned ON.
3) Release parking brake with ignition switch ON and check that EBD warning lig ht (brake warning light)
goes off.
If it doesn’t go off, go to “EBD Warning Light (Brake
Warning Light) Comes ON Steady”.
11
I4RS0A450007-01
BRAKE
1
I4RS0A450008-01

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ABS Warning Light Does Not Come ON at Ignition Switch ONS7RS0B4504008
Wiring Diagram
Circuit Description
Operation (ON/OFF) of ABS warning light is controlled by ABS contro l module through lamp driver module in
combination meter.
If the antilock brake system is in good condition, ABS control module turns ABS warning light ON at the ignition switch
ON, keeps it ON for 2 seconds and then turns it OFF. If an abnormality in the system is detected, ABS warning light is
turned ON continuously by ABS control module. Also, it is turned ON continuously by la mp driver module when the
connector of ABS control module is disconnected.
Troubleshooting
WHT/BLU
BLK 12V
9
BLK
E03-14
E03-13
E03-26
WHT/RED
GRN/ORNE03-7WHT/BLUGRN
1
2
3
48
RED/BLK
76
5
10
E03-112V[A]
E03
15
16
17
18
19
20
21
22
23
24
25 2
3
4
5
6
7
8
9
10
11
12
1
13
14
26
BLK/ORN
E03-12
E03-6
REDWHT
10
G28-8
G28-10
REDWHTE46-1
E46-2
RED/BLK
RED/BLK
RED
RED
WHT
WHT
12
13
11
10
G37-2
G37-4
I6RS0C450007-01
[A]: ABS hydraulic unit / control module connector (viewed from terminal side) 5. Combination meter 10. CAN driver
1. Battery 6. ABS warning light 11. BCM
2. Main fuse box 7. EBD warning light (Brake warning light) 12. Brake fluid level switch
3. Ignition switch 8. Lamp driver module 13. Parking brake switch
4. Circuit fuse box 9. ABS hydraulic unit / control module assembly
Step Action YesNo
1 1) Turn ignition switch to ON position.
Do other warning lights come ON? Go to Step 2.
Go to Step 3.
2 1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ignition switch to ON position and check DTC.
Is there DTC U1073? Go to “DTC U1073:
Control Module
Communication Bus
Off”.
Substitute a known-
good combination meter
and recheck. If ABS
warning light remains
OFF, substitute a
known-good ABS
hydraulic unit / control
module assembly and
recheck.
3 Is Circuit fuse fo r combination meter in good condition? Go to Step 4.Replace fuse and check
for short circuit to
ground.

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ABS Warning Light Comes ON SteadyS7RS0B4504009
Wiring Diagram
Refer to “ABS Warning Light Does Not Come ON at Ignition Switch ON”.
Circuit Description
Operation (ON/OFF) of ABS wa rning light is controlled by ABS contro l module through lamp driver module in
combination meter.
If the Antilock brake system is in good condition, ABS control module turns ABS warning lig ht ON at the ignition switch
ON, keeps it ON for 2 seconds and then turns it OFF. If an abnormality in the system is detected, ABS warning light is
turned ON continuously by ABS c ontrol module. Also, it is turned ON continuously by la mp driver module when the
connector of ABS control module is disconnected.
Troubleshooting 4 Check CAN communication circuit between combination
meter and ABS control module referring to “DTC U1073:
Control Module Communication Bus Off”.
Is CAN communication circuit in good condition? Go to Step 5.
Repair or replace.
5 1) Remove combination meter wit h ignition switch turned
OFF.
2) Check for proper connection to “RED/BLK” and “BLK/ ORN” wire of combinat ion meter connector.
3) If OK, turn ON ignition switch and measure voltage at “PPL/RED” wire of combi nation meter connector and
vehicle body ground.
Is it 10 – 14 V? Go to Step 6.
Repair power supply
circuit for combination
meter.
6 1) Measure resistance between “BLK/ORN” wire of combination meter connector and vehicle body ground.
Is resistance less than 2
Ω? Replace combination
meter.
“BLK/ORN” circuit open
or high resistance.
Step Action Yes No
Step
Action YesNo
1 1) Perform diagnostic trouble code check.
Is there any DTC(s)? Go to applicable DTC
diag. flow.
Go to Step 2.
2 Are main fuses for ABS pump motor and ABS solenoid in
good condition? Go to Step 3.
Replace fuse and check
circuit for short to
ground.
3 1) Turn ignition switch to OFF.
2) Disconnect ABS control module connector.
3) Check for proper connection to ABS control module connector at terminals “E03-7”, “E03-13” and “E03-26”.
4) If OK then turn ignition switch to ON position and measure voltage between terminal “E03-7” and vehicle
body ground.
Is it 10 – 14 V? Go to Step 4.
“GRN/ORN” circuit
open.
4 1) Turn ignition switch to OFF position. 2) Check for proper connection to ABS control module connector at terminals “E03-1” and “E03-14”.
3) If OK then turn ignition switch to ON position and measure voltage between each terminal of “E03-1”,
“E03-14” and vehicle body ground.
Are they 10 – 14 V? Go to Step 5.
“WHT/RED” and/or
“WHT/BLU” circuit
open.

Downloaded from www.Manualslib.com manuals search engine 4E-17 ABS:
5 1) Turn ignition switch to OFF position.2) Check for proper connection to ABS hydraulic unit / control module connector at terminals “E03-13” and
“E03-26”.
3) If OK, measure resistance between each terminal of “E03-13”, “E03-26” and vehicle body ground.
Are resistance less than 2
Ω? Go to Step 6. Ground circuit for ABS
hydraulic unit / control
module open or high
resistance.
6 1) Check if communication is possible by trying communication with other controller (ECM, BCM or
SDM).
Is it possible to commun icate with other controller? Go to Step 7. Repair open in common
section of serial data
circuit (“PPL/WHT” wire
circuit) used by all
controllers or short to
ground or power circuit
which has occurred
somewhere in serial
data circuit (“PPL/WHT”
wire circuit).
7 1) Turn ignition switch to ON position.
2) Measure voltage between terminal B of data link connector and vehicle body ground.
Is voltage 10 – 12 V? Go to step 8. Terminal B circuit open
or shorted to ground.
8 1) Turn ignition switch to OFF position. 2) Measure resistance between the following terminals;• Terminal G of data link connector and vehicle body ground.
• Terminal G1 of data link connector and vehicle body ground.
Is each resistance 1
Ω or less? Go to step 9. Terminal G and/or G1
circuit open or high
resistance.
9 1) Turn ignition switch to OFF position. 2) Check proper connection at “E03-5” (“PPL/WHT” wire) terminal for serial data circuit.
3) If OK, then check resistance between “E03-5” (“PPL/ WHT” wire) terminal and “PPL/WHT” wire terminal (2) for
serial data circuit in DLC (1).
Is resistance 1
Ω or less? Substitute a known-
good ABS hydraulic unit
/ control module and
recheck.
Repair high resistance
or open in “PPL/WHT”
wire circuit for anti lock
brake system.
Step Action Yes No
I4RS0A450013-02