2000 SUZUKI SWIFT rear brake

ANTILOCK BRAKE SYSTEM (ABS) 5E-3
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 lamp which lights to inform abnormality when system fails to operate properly.
ABS hydraulic unit/control module assembly is incorporated ABS control module, ABS hydraulic unit (actua-
tor assembly), fail-safe relay and pump motor relay.
–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.
–Fail-safe relay (solenoid valve) relay which supplies power to solenoid valve in ABS hydraulic unit and
pump motor relay.
–Pump motor relay which supplies power to pump motor in ABS hydraulic unit.
G sensor which detects body deceleration speed. (For 4WD model only)]
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 proportioning valve, by the signal from wheel sen-
sor independently of change of load due to load capacity and so on. And if the EBD system fails to operate prop-
erly, the brake warning lamp lights to inform abnormality.
[A] : RH steering vehicle shown 4. Stop lamp switch
1. ABS hydraulic unit/control module assembly 5. ABS warning lamp
2. G sensor (For 4WD vehicle only) 6. EBD warning lamp (Brake warning lamp)
3. Wheel speed sensors
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2 4
33
[A]
NOTE:
As for the difference of RH steering vehicle and LH steering vehicle, the location of the combination
meter and the brake master cylinder assembly only changes.

5E-4 ANTILOCK BRAKE SYSTEM (ABS)
SYSTEM SCHEMATIC
1. ABS hydraulic unit/control module assembly 7.“ABS” warning lamp 13. Wheel speed sensor (Right-front)
2. ABS control module 8.“EBD” warning lamp (Brake warning lamp) 14. Wheel speed sensor (Left-front)
3. ABS hydraulic unit 9. Lamp driver module 15. Wheel speed sensor (Right-rear)
4. Fail safe relay 10. ECM 16. Wheel speed sensor (Left-rear)
5. Pump motor relay 11. Data link connector 17. G sensor (For 4WD vehicle only)
6. Stop lamp switch 12. Monitor coupler
INPUT OUTPUT
ABS control
module Wheel speed sensor (LF)
Wheel speed sensor (LR)
Wheel speed sensor (RF)
Wheel speed sensor (RR)
Stop lamp switch
Diag. switch terminal
Battery Voltage
G sensor (for 4WD vehicle only)
Pump motor
relay
Fail-safe
relay
Hydraulic unit
Pump motor
LF inlet solenoid
LF outlet solenoid
LR inlet solenoid
LR outlet solenoid
RF inlet solenoid
RF outlet solenoid
RR inlet solenoid
RR outlet solenoid
“ABS” warning lamp
ECM
EBD warning lamp
(Brake warning lamp)
Data link connector
ABS hydraulic unit/control
module assembly

ANTILOCK BRAKE SYSTEM (ABS) 5E-7
1. Battery 9. ABS hydraulic unit/control module assembly 17. Left-rear wheel speed sensor
2. Main fuses 10. Terminal arrangement of connector E19 for ABS
hydraulic unit/control module assembly18. Right-front wheel speed sensor
3. Ignition switch 11. ABS fail-safe relay (Solenoid valve relay) 19. Left-front wheel speed sensor
4. Circuit fuses 12. ABS pump motor relay 20. Data link connector
5. Combination meter 13. Pump motor 21. To ECM, SDM and EPS controller (if equipped)
6. ABS warning lamp 14. Solenoid valves 22. Stop lamp
7. Brake warning lamp (“EBD” warning lamp) 15. Diagnosis monitor coupler 23. Stop lamp switch
8. Warning lamp driver module (for ABS) 16. Right-rear wheel speed sensor 24. G sensor (For 4WD vehicle only)
Wire color
BLK : Black LT GRN/BLK : Light Green/Black RED/BLU : Red/Blue
BLK/ORN : Black/Orange LT GRN/RED : Light Green/Red WHT : White
BLK/YEL : Black/Yellow ORN : Orange WHT/BLK : White/Black
BLU : Blue PNK : Pink WHT/BLU : White/Blue
BRN : Brown PNK/BLU Pink/Blue WHT/RED : White/Red
GRN : Green RED : Red YEL : Yellow
GRN/ORN : Green/Orange RED/BLK : Red/Black
TERMINAL CIRCUIT
E191–
2 Stop lamp switch
3 Right-front wheel speed sensor (+)
4 Right-front wheel speed sensor (–)
5–
6 Right-rear wheel speed sensor (–)
7 Right-rear wheel speed sensor (+)
8–
9–
10 Brake warning lamp (EBD warning lamp)
11 G sensor (For 4WD vehicle only)
12 Diagnosis switch terminal
13 Ground (For G sensor) (For 4WD vehicle only)
14 ABS warning lamp
15 Left-front wheel speed sensor (+)
16 Left-front wheel speed sensor (–)
17–
18 Ignition switch
19 Left-rear wheel speed sensor (+)
20 Left-rear wheel speed sensor (–)
21 Data link connector
22 Ground (for ABS pump motor)
23 ABS pump motor relay
24 Ground (for ABS control module)
25 ABS fail-safe relay

5E-24 ANTILOCK BRAKE SYSTEM (ABS)
DTC C1021 (DTC 21), DTC C1022 (DTC 22) – RIGHT-FRONT WHEEL SPEED
SENSOR CIRCUIT OR SENSOR RING
DTC C1025 (DTC 25), DTC C1026 (DTC 26) – LEFT-FRONT WHEEL SPEED
SENSOR CIRCUIT OR SENSOR RING
DTC C1031 (DTC 31), DTC C1032 (DTC 32) – RIGHT-REAR WHEEL SPEED
SENSOR CIRCUIT OR SENSOR RING
DTC C1035 (DTC 35), DTC C1036 (DTC 36) – LEFT-REAR WHEEL SPEED SEN-
SOR CIRCUIT OR SENSOR RING
DESCRIPTION
The ABS control module monitors the voltage at the terminal of each sensor while the ignition switch is ON.
When the voltage is not within the specified range, an applicable DTC will be set. Also, when no sensor signal is
inputted at starting or while running, an applicable DTC will be set.
1. Ignition switch 4. Right-front wheel speed sensor 7. ABS hydraulic unit/control module connector
2. ABS control module/hydraulic unit assembly 5. Left-rear wheel speed sensor
3. Left-front wheel speed sensor 6. Right-rear wheel speed sensor
NOTE:
When the vehicle was operated in any of the following ways, one of these DTCs may be set even when
the sensor is in good condition. If such possibility is suspected, repair the trouble (dragging of brake,
etc.) of the vehicle, clear DTC once and then after performing the driving test as described in Step 2 of
“ABS DIAGNOSIS FLOW TABLE”, check whether or not any abnormality exists.
The vehicle was driven with parking brake pulled.
The vehicle was driven with brake dragging.
Wheel spin occurred while driving.
Wheel(s) was turned while the vehicle was jacked up.
The vehicle was stuck.

ANTILOCK BRAKE SYSTEM (ABS) 5E-25
INSPECTION
Step Action Yes No
1 1) Disconnect applicable ABS wheel speed sensor coupler
with ignition switch OFF.
2) Measure resistance between terminals of ABS wheel
speed sensor. Refer to “FRONT WHEEL SPEED SEN-
SOR” and/or “REAR WHEEL SPEED SENSOR” in this
section.
Is measured resistance value as specified?Go to Step 2. Replace ABS wheel
speed sensor
assembly.
2 1) Turn ignition switch OFF.
2) Disconnect ABS hydraulic unit/control module connec-
tor.
3) Check for proper connection to ABS control module at
each sensor terminal.
4) If OK, then turn ignition switch ON and measure voltage
between sensor terminal of module connector and body
ground.
Is it 0V?Go to Step 3. ABS wheel speed
sensor circuit
shorted to power.
3 1) Turn ignition switch OFF.
2) Connect ABS wheel speed sensor coupler.
3) Measure resistance between the following points.
Both ABS hydraulic unit/control module connector termi-
nals of the corresponding sensor.
This check result should be the same as above Step 1.
Either terminal of wheel speed sensor coupler and body
ground.
This check result should be no continuity.
Are both check results OK?Go to Step 4. Circuit open or
shorted to ground.
4 1) Remove applicable ABS wheel speed sensor.
2) Check sensor for damage or foreign material attached.
Is it in good condition?Go to Step 5. Clean, repair or
replace.
5 Check front and/or rear sensor ring for the following
(remove rear drum as necessary) :
Rotor serration (teeth) neither missing nor damaged.
No foreign material being attached.
Rotor not being eccentric.
Wheel bearing free from excessive play.
Are they in good condition?Go to Step 6. Clean, repair or
replace.
6 1) Install ABS wheel speed sensor to knuckle.
2) Tighten sensor bolt to specified torque and check that
there is no clearance between sensor and knuckle.
Is it OK?Go to Step 7. Replace ABS wheel
speed sensor.
7 Referring to “Reference” of “FRONT WHEEL SPEED SEN-
SOR” and/or “Reference” of “REAR WHEEL SPEED SEN-
SOR” in this section, check output voltage or waveform.
Is specified voltage and/or waveform obtained?Substitute a known-
good ABS hydrau-
lic unit/control mod-
ule assembly and
recheck.Replace sensor and
recheck.

5E-26 ANTILOCK BRAKE SYSTEM (ABS)
DTC C1041 (DTC 41) – RIGHT-FRONT INLET SOLENOID CIRCUIT
DTC C1045 (DTC 45) – LEFT-FRONT INLET SOLENOID CIRCUIT
DTC C1051 (DTC 51) – RIGHT-REAR INLET SOLENOID CIRCUIT
DTC C1055 (DTC 55) – LEFT-REAR INLET SOLENOID CIRCUIT
DTC C1042 (DTC 42) – RIGHT-FRONT OUTLET SOLENOID CIRCUIT
DTC C1046 (DTC 46) – LEFT-FRONT OUTLET SOLENOID CIRCUIT
DTC C1052 (DTC 52) – RIGHT-REAR OUTLET SOLENOID CIRCUIT
DTC C1056 (DTC 56) – LEFT-REAR OUTLET SOLENOID CIRCUIT
DESCRIPTION
The ABS control module monitors the output from the valve.
When the output of each valve exceeds the specified value compared with the signal sent from ABS control
module, this DTC is set.
INSPECTION
1. ABS hydraulic unit/control module assembly 3. ABS control module 5. Fail-safe relay
2. ABS hydraulic unit/control module assembly connector 4. Signal
Step Action Yes No
1 1) Check solenoid operation referring to item “ABS
HYDRAULIC UNIT OPERATION CHECK” in this
section.
Is it in good condition?Check terminal “E19-25” con-
nection. If connection is OK,
substitute a known-good ABS
hydraulic unit/control module
assembly and recheck.Go to Step 2.
2 1) Ignition switch OFF.
2) Disconnect ABS hydraulic unit/control module con-
nector.
3) Check for proper connection to ABS hydraulic unit/
control module connector at terminal “E19-25”.
4) If OK, then measure voltage between terminal
“E19-25” of module connector and “E19-24”.
Is it 10 – 14 V?Substitute a known-good
ABS hydraulic unit/control
module assembly and
recheck.“WHT/BLU” or
“BLK” circuit
open.

5E-38 ANTILOCK BRAKE SYSTEM (ABS)
REAR WHEEL SPEED SENSOR
OUTPUT VOLTAGE INSPECTION
1) Turn ignition switch OFF.
2) Remove rear seat referring to Section 9.
3) Turn over floor carpet.
4) Hoist vehicle.
5) Disconnect connector of wheel speed sensor.
6) Connect voltmeter between connector (1) terminals.
7) While turning wheel at a speed of approximately 1/2 rotation
to 1 rotation per second, check AC voltage of sensor.
Output AC voltage at 1/2 to 1 rotation per second
2WD vehicle : 85 mV or more
4WD vehicle : 106 mV or more
8) If measured voltage is not as specified, check sensor, rotor
and their installation conditions.
1. Left rear wheel speed sensor 3. Trailing arm
2. Right rear wheel speed sensor 4. Sensor ring
3 1
4
2
3

ANTILOCK BRAKE SYSTEM (ABS) 5E-39
Reference
When using oscilloscope for this check, check if peak-to-peak
voltage (1) meets specification and waveform is complete.
Peak-to-peak voltage at 1/2 to 1 rotation per second
2WD vehicle : 120 mV or more at 20 Hz
4WD vehicle : 150 mV or more at 20 Hz
REMOVAL
1) Disconnect negative cable at battery.
2) Remove rear seat referring to Section 9.
3) Turn over floor carpet.
4) Hoist vehicle.
5) Disconnect rear wheel speed sensor coupler (1).
6) Detach ABS wheel sensor wire harness (2) from suspension
frame (3).
7) Remove rear wheel speed sensor (4) from rear axle housing.
SENSOR INSPECTION
Check sensor for damage.
Check sensor for resistance and continuity.
Between both terminals of sensor
2WD vehicle : 0.9 – 1.3 k
Ω
ΩΩ Ω at 20°C (68°F)
4WD vehicle : 1.2 – 1.6 k
Ω
ΩΩ Ω at 20°C (68°F)
Between sensor terminal and sensor body
: No continuity
If the check result is not as specified and any malcondition is
found, replace.
NOTE:
Do not detach crip of rear wheel speed sensor connector
from vehicle body unless replacement is necessary.
CAUTION:
Do not pull wire harness when removing rear wheel
speed sensor.
Do not cause damage to surface of rear wheel speed
sensor and do not allow dust, etc. to enter its installa-
tion hole.
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