brake sensor NISSAN NOTE 2016 Service Repair Manual

BCS
DIAGNOSIS SYSTEM (BCM)BCS-23
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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ACTIVE TEST
Monitor Item [Unit]
Main Description
REQ SW -DR [On/Off] ×Indicates condition of door request switch LH.
REQ SW -AS [On/Off] ×Indicates condition of door request switch RH.
REQ SW -BD/TR [On/Off] ×Indicates condition of back door request switch.
PUSH SW [On/Off] Indicates condition of push-button ignition switch.
CLUCH SW [On/Off] ×Indicates condition of clutch interlock switch.
BRAKE SW 1 [On/Off] ×Indicates condition of brake switch.
BRAKE SW 2 [On/Off] Indicates condition of brake switch.
DETE/CANCL SW [On/Off] ×Indicates condition of P (park) position.
SFT PN/N SW [On/Off] ×Indicates condition of P (park) or N (neutral) position.
UNLK SEN -DR [On/Off] ×Indicates condition of door unlock sensor.
PUSH SW -IPDM [On/Off] Indicates condition of push-button ignition switch received from IPDM E/R on
CAN communication line.
IGN RLY1 -F/B [On/Off] Indicates condition of ignition relay 1 received from IPDM E/R on CAN commu-
nication line.
DETE SW -IPDM [On/Off] Indicates condition of detent switch received from TCM on CAN communication
line.
SFT PN -IPDM [On/Off] Indicates condition of P (park) or N (neutral) position from TCM on CAN com-
munication line.
SFT P -MET [On/Off] Indicates condition of P (park) position from TCM on CAN communication line.
SFT N -MET [On/Off] Indicates condition of N (neutral) position from IPDM E/R on CAN communica-
tion line.
ENGINE STATE [Stop/Start/Crank/Run] ×Indicates condition of engine state from ECM on CAN communication line.
VEH SPEED 1 [mph/km/h] ×Indicates condition of vehicle speed si
gnal received from ABS on CAN commu-
nication line.
VEH SPEED 2 [mph/km/h] ×Indicates condition of vehicle speed signal received from combination meter on
CAN communication line.
DOOR STAT -DR [LOCK/READY/UNLK] ×Indicates condition of driver side door status.
DOOR STAT -AS [LOCK/READY/UNLK] ×Indicates condition of passenger side door status.
ID OK FLAG [Set/Reset] Indicates condition of Intelligent Key ID.
PRMT ENG STRT [Set/Reset] Indicates condition of engine start possibility.
RKE OPE COUN1 [0-19] ×When remote keyless entry receiver receives the signal transmitted while oper-
ating on Intelligent Key, the numerical value start changing.
RKE OPE COUN2 [0-19] ×When remote keyless entry receiver receives the signal transmitted while oper-
ating on Intelligent Key, the numerical value start changing.
RKE-LOCK [On/Off] Indicates condition of lock signal from Intelligent Key.
RKE-UNLOCK [On/Off] Indicates condition of unlock signal from Intelligent Key.
RKE-PANIC [On/Off] Indicates condition of panic signal from Intelligent Key.
RKE-MODE CHG [On/Off] Indicates condition of mode change signal from Intelligent Key.
Test Item Description
INSIDE BUZZER This test is able to check combination meter warning chime operation [Take Out/Knob/Key/
Off].
LCD This test is able to check combination me
ter display information [Off/LK WN/OUTKEY/NO
KY/BATT/INSRT/SFT P/ROTAT/ID NG/B&P I/B&P N].
BATTERY SAVER This test is able to check battery saver operation [On/Off].
ENGINE SW ILLUMI This test is able to check push-button ignition switch START indicator operation [On/Off].
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BRC-1
BRAKES
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SECTION BRC
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CONTENTS
BRAKE CONTROL SYSTEM
VDC/TCS/ABS
PRECAUTION ....... ........................................
4
PRECAUTIONS .............................................. .....4
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
4
Precaution for Brake System ....................................4
Precaution for Brake Control System ........................5
Precaution for Harness Re pair ..................................5
PREPARATION ............................................6
PREPARATION .............................................. .....6
Special Service Tool ........................................... ......6
Commercial Service Tool ..........................................6
SYSTEM DESCRIPTION ..............................7
COMPONENT PARTS ................................... .....7
Component Parts Location .................................. ......7
Component Description .............................................8
ABS Actuator and Electric Unit (Control Unit) ...........8
Wheel Sensor and Sensor Rotor ..............................9
Stop Lamp Switch .....................................................9
Steering Angle Sensor ..............................................9
VDC OFF Switch .....................................................10
Brake Fluid Level Switch .........................................10
Parking Brake Switch ..............................................10
SYSTEM .............................................................11
VDC/TCS/ABS ....................................................... ....11
VDC/TCS/ABS : System Diagram ...........................11
VDC/TCS/ABS : System De scription ......................11
VDC/TCS/ABS : VDC Functi on ...............................22
VDC/TCS/ABS : TCS Function ........... ....................24
VDC/TCS/ABS : ABS Function ........................... ....26
VDC/TCS/ABS : EBD Functi on ...............................27
VDC/TCS/ABS : Fail-safe ......................... ..............28
DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] .......
31
CONSULT Function (ABS) .................................. ....31
ECU DIAGNOSIS INFORMATION ..............36
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) .............................................
36
Reference Value .................................................. ....36
Fail-safe ...................................................................39
DTC Inspection Priority Chart ..................................42
DTC Index ...............................................................43
WIRING DIAGRAM ......................................44
BRAKE CONTROL SYSTEM ...........................44
Wiring Diagram .................................................... ....44
BASIC INSPECTION ...................................52
DIAGNOSIS AND REPAIR WORK FLOW .......52
Work Flow ............................................................ ....52
Diagnostic Work Sheet ............................................53
INSPECTION AND ADJUSTMENT ..................55
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ....
55
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description .................................
55
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement ......
55
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION ............................................ ....
55
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION : Description .........................
55
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION : Special Repair Require-
ment .........................................................................
55
CALIBRATION OF DECEL G SENSOR ................ ....56
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BRC-2
CALIBRATION OF DECEL G SENSOR : Descrip-
tion ..........................................................................
56
CALIBRATION OF DECEL G SENSOR : Special
Repair Requirement ..... ..........................................
56
DTC/CIRCUIT DIAGNOSIS ...................... ...58
C1101, C1102, C1103, C1104 WHEEL SEN-
SOR ................................................................. ...
58
DTC Description .................................................. ...58
Diagnosis Procedure ..............................................59
C1105, C1106, C1107, C1108 WHEEL SEN-
SOR ....................................................................
63
DTC Description .................................................. ...63
Diagnosis Procedure ..............................................64
C1109 POWER AND GROUND SYSTEM .........70
DTC Description .................................................. ...70
Diagnosis Procedure ..............................................70
C1110, C1153 ABS ACTUATOR AND ELEC-
TRIC UNIT (CONTROL UNIT) ...........................
72
DTC Description .....................................................72
Diagnosis Procedure ..............................................73
C1111 ABS MOTOR, MOTOR RELAY SYS-
TEM ....................................................................
74
DTC Description .................................................. ...74
Diagnosis Procedure ..............................................74
C1115 WHEEL SENSOR ...................................77
DTC Description .................................................. ...77
Diagnosis Procedure ..............................................77
C1116 STOP LAMP SWITCH ............................84
DTC Description .................................................. ...84
Diagnosis Procedure ..............................................85
Component Inspection ............................................87
C1120, C1122, C1124, C1126 ABS IN VALVE
SYSTEM .......................................................... ...
88
DTC Description .................................................. ...88
Diagnosis Procedure ..............................................88
C1121, C1123, C1125, C1127 ABS OUT
VALVE SYSTEM ................................................
90
DTC Description .................................................. ...90
Diagnosis Procedure ..............................................90
C1130 ENGINE SIGNAL ...................................92
DTC Description .................................................. ...92
Diagnosis Procedure ..............................................92
C1140 ACTUATOR RELAY SYSTEM ...............94
DTC Description .................................................. ...94
Diagnosis Procedure ..............................................94
C1142 PRESS SENSOR ...................................96
DTC Description .................................................. ...96
Diagnosis Procedure ..............................................96
C1143 STEERING ANGLE SENSOR ...............99
DTC Description ................................................... ...99
Diagnosis Procedure ...............................................99
C1144 INCOMPLETE STEERING ANGLE
SENSOR ADJUSTMENT .................................
103
DTC Description ................................................... .103
Diagnosis Procedure .............................................103
C1145, C1146 YAW RATE/SIDE/DECEL G
SENSOR ...........................................................
105
DTC Description ................................................... .105
Diagnosis Procedure .............................................105
C1154 TRANSMISSION RANGE SWITCH ......106
DTC Description ................................................... .106
Diagnosis Procedure .............................................106
C1155 BRAKE FLUID LEVEL SWITCH ..........108
DTC Description ................................................... .108
Diagnosis Procedure .............................................108
Component Inspection ..........................................111
C1164, C1165 CV SYSTEM .............................112
DTC Description ....................................................112
Diagnosis Procedure .............................................112
C1166, C1167 SV SYSTEM .............................114
DTC Description ....................................................114
Diagnosis Procedure .............................................114
C1170 VARIANT CODING ...............................116
DTC Description ................................................... .116
Diagnosis Procedure .............................................116
U1000 CAN COMM CIRCUIT ...........................117
DTC Description ................................................... .117
Diagnosis Procedure .............................................117
U1002 SYSTEM COMM (CAN) ........................118
DTC Description ................................................... .118
Diagnosis Procedure .............................................118
U1010 CONTROL UNIT (CAN) ........................120
DTC Description ................................................... .120
Diagnosis Procedure .............................................120
POWER SUPPLY AND GROUND CIRCUIT ....121
Diagnosis Procedure ............................................ .121
PARKING BRAKE SWITCH .............................124
Component Function Check ................................ .124
Diagnosis Procedure .............................................124
Component Inspection ..........................................125
VDC OFF SWITCH ...........................................126
Component Function Check ................................ .126
Diagnosis Procedure .............................................126
Component Inspection ..........................................127
ABS WARNING LAMP .....................................128
Component Function Check ................................ .128
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BRC-3
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Diagnosis Procedure ...........................................
..
128
BRAKE WARNING LAMP ............................. ..129
Component Function Check ................................ ..129
Diagnosis Procedure .............................................129
VDC OFF INDICATOR LAMP ..........................130
Component Function Check ................................ ..130
Diagnosis Procedure .............................................130
SLIP INDICATOR LAMP ..................................131
Component Function Check ................................ ..131
Diagnosis Procedure .............................................131
SYMPTOM DIAGNOSIS ............................132
VDC/TCS/ABS ................................................ ..132
Symptom Table ................................................... ..132
EXCESSIVE ABS FUNCTION OPERATION
FREQUENCY ...................................................
133
Diagnosis Procedure ........................................... ..133
UNEXPECTED PEDAL REACTION ................134
Diagnosis Procedure ........................................... ..134
THE BRAKING DISTANCE IS LONG ..............135
Diagnosis Procedure ........................................... ..135
ABS FUNCTION DOES NOT OPERATE .........136
Diagnosis Procedure ........................................... ..136
PEDAL VIBRATION OR ABS OPERATION
SOUND OCCURS ............................................
137
Diagnosis Procedure ........................................... ..137
VEHICLE JERKS DURING VDC/TCS/ABS
CONTROL ........................................................
138
Diagnosis Procedure ........................................... ..138
NORMAL OPERATING CONDITION .............139
Description ........................................................... ..139
REMOVAL AND INSTALLATION .............140
WHEEL SENSOR ............................................140
FRONT WHEEL SENSOR ..................................... ..140
FRONT WHEEL SENSOR : Exploded View .........140
FRONT WHEEL SENSOR : Removal and Instal-
lation ......................................................................
140
REAR WHEEL SENSOR ....................................... ..141
REAR WHEEL SENSOR : Exploded View ............141
REAR WHEEL SENSOR : Removal and Installa-
tion .........................................................................
141
SENSOR ROTOR ............................................143
FRONT SENSOR ROTOR ..................................... ..143
FRONT SENSOR ROTOR : Removal and Instal-
lation ......................................................................
143
REAR SENSOR ROTOR ....................................... ..143
REAR SENSOR ROTOR : Removal and Installa-
tion .........................................................................
143
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) ...........................................
144
Exploded View .......................................................144
Removal and Installation .......................................144
VDC OFF SWITCH ..........................................146
Removal and Installation .......................................146
STEERING ANGLE SENSOR .........................147
Exploded View .......................................................147
Removal and Installation .......................................147
Revision: August 2015 2016 Versa Note

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BRC-4
< PRECAUTION >[VDC/TCS/ABS]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint Syst
em (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000012430820
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SR and SB section of
this Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery and wait at least three minutes before performing any service.
Precaution for Brake SystemINFOID:0000000012430821
WARNING:
Clean any dust from the front brake and rear brake using a vacuum dust collector. Do not blow by
compressed air.
• Brake fluid use refer to MA-11, "
Fluids and Lubricants".
• Do not reuse drained brake fluid.
• Do not spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it off
immediately and wash with water if it gets on a painted surface.
• Always confirm the specified tightening torque when installing the brake pipes.
• After pressing the brake pedal more deeply or harder t han normal driving, such as air bleeding, check each
item of brake pedal. Adjust brake pedal if it is outside the standard value.
• Do not use mineral oils such as gasoline or light oil to clean. They may damage rubber parts and cause
improper operation.
• Always loosen the brake tube flare nut with a flare nut wrench.
• Tighten the brake tube flare nut to the specified torque with a crow-
foot (A) and torque wrench (B).
• Always connect the battery terminal when moving the vehicle.
• Turn the ignition switch OFF and disconnect the ABS actuator and electric unit (control unit) harness connector or the battery negative
terminal before performing the work.
• Check that no brake fluid leakage is present after replacing the parts.
JPFIA0001ZZ
Revision: August 2015 2016 Versa Note

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BRC-6
< PREPARATION >[VDC/TCS/ABS]
PREPARATION
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000012430824
The actual shape of the tools may differ from those illustrated here.
Commercial Service ToolINFOID:0000000012430825
Tool number
(TechMate No.)
Tool nameDescription
KV991J0080
(J-45741)
ABS active wheel sensor tester Checking operation of ABS active wheel sen-
sors
WFIA0101E
Tool name
Description
1. Flare nut crowfoot
2. Torque wrench Tightening brake tube flare nuts

a: 10mm (0.39 in)/12mm (0.47 in)
Power Tool Loosening nuts, screws and bolts
S-NT360
PIIB1407E
Revision: August 2015 2016 Versa Note

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BRC-8
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
COMPONENT PARTS
Component Description
INFOID:0000000012430827
ABS Actuator and Electric Unit (Control Unit)INFOID:0000000012430828
Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS func-
tion, ABS function and EBD function.
ELECTRIC UNIT (CONTROL UNIT)
• Brake fluid pressure is controlled according to signals from each sensor.
• If malfunction is detected, the system enters fail-safe mode.
ACTUATOR
The following components are integrated with ABS actuator:
Pump
Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor
Activates the pump according to signals from ABS actuator and electric unit (control unit).
Motor Relay
Operates the motor ON/OFF according to signals fr om ABS actuator and electric unit (control unit).
Actuator Relay (Main Relay)
Operates each valve ON/OFF according to signals fr om ABS actuator and electric unit (control unit).
ABS IN Valve
A. View with steering wheel and spiral
cable removed B. Left side of instrument panel C. Left side of engine compartment
D. Left side of engine compartment E. Right side of engine compartment F. Left front wheel assembly
G. Near brake pedal area H. Left side of instrument panel I. Center of front seats (view with cen-
ter console removed)
J. Left rear wheel assembly
ALFIA0482ZZ
Component Reference/Function
1 Steering angle sensor BRC-9, "
Steering Angle Sensor"
2 VDC OFF switchBRC-10, "VDC OFF Switch"
3 IPDM E/RPCS-4, "Component Parts Location"
4 Brake fluid level switchBRC-10, "Brake Fluid Level Switch"
5 ABS actuator and electric unit (control unit)BRC-8, "ABS Actuator and Electric Unit (Control Unit)"
6 Front wheel sensorBRC-9, "Wheel Sensor and Sensor Rotor"
7 Stop lamp switchBRC-9, "Sto p La mp Sw itc h"
8 Combination meter (type A)MWI-9, "METER SYSTEM : Combination Meter"
9 Combination meter (type B)MWI-9, "METER SYSTEM : Combination Meter"
10 Parking brake switch BRC-10, "Parking Brake Switch"
11. Rear wheel sensor BRC-9, "Wheel Sensor and Sensor Rotor"
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COMPONENT PARTSBRC-9
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
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Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT Valve
Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Cut Valve 1, Cut Valve 2
Shuts off the ordinary brake line from master cylinder, when VDC function and TCS function are activated.
Suction Valve 1, Suction Valve 2
Supplies the brake fluid from master cylinder to the pump, when VDC function and TCS function are activated.
Return Check Valve
Returns the brake fluid from brake caliper and wheel cyli nder to master cylinder by bypassing orifice of each
valve when brake is released.
Reservoir
Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when
decreasing pressure of brake caliper and wheel cylinder.
Yaw rate/side/decel G sensor
Calculates the following information that affects the v ehicle, and transmits a signal to ABS actuator and elec-
tric unit (control unit) via communication lines:
• Vehicle rotation angular velocity (yaw rate signal)
• Vehicle lateral acceleration (side G signal) and longitudinal acceleration (decel G signal)
Pressure Sensor
Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Wheel Sensor and Sensor RotorINFOID:0000000012430829
NOTE:
• Wheel sensor of front wheel is installed on steering knuckle.
• Sensor rotor of front wheel is integrated in wheel hub assembly.
• Wheel sensor of rear wheel is installed on back plate of rear brake.
• Sensor rotor of rear wheel is installed on rear brake drum.
• Never measure resistance and voltage value using a tester because sensor is active sensor.
• Downsize and weight reduction is aimed. IC for detection portion
and magnet for sensor rotor are adopted.
• Power supply is supplied to detection portion so that magnetic field
line is read. Magnetic field that is detected is converted to current
signal.
• When sensor rotor rotates, magnetic field changes. Magnetic field
change is converted to current signals (rectangular wave) and is
transmitted to ABS actuator and electric unit (control unit). Change
of magnetic field is pr oportional to wheel speed.
Stop Lamp SwitchINFOID:0000000012430830
Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-
tric unit (control unit).
Steering Angle SensorINFOID:0000000012430831
Detects the following information and transmits steering angle signal to ABS actuator and electric unit (control
unit) via CAN communication:
• Steering wheel rotation amount
• Steering wheel rotation angular velocity
• Steering wheel rotation direction
JPFIC0131GB
Revision: August 2015 2016 Versa Note

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BRC-12
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
VALVE OPERATION (VDC AND TCS FUNCTIONS)
The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-
ipers by operating each valve.
VDC and TCS Functions are Operating (Pressure Increases)
Component
Signal description
Steering angle sensor Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via
CAN communication.
ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication:
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM Transmits the current gear position signal to ABS actuator and electric unit (control unit) via
CAN communication.
Combination meter Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication:
• Brake fluid level switch signal
• Parking brake switch signal
Receives the following signals fr
om ABS actuator and electric un it (control unit) via CAN com-
munication:
• ABS warning lamp signal
• Brake warning lamp signal
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
JSFIA0670GB
Name Not activated Pressure increases
Cut valve 1 Power supply is not supplied (open) Power supply is supplied (close)
Cut valve 2 Power supply is not supplied (open) Power supply is supplied (close)
Suction valve 1 Power supply is not supplied (close) Power supply is supplied (open)
Suction valve 2 Power supply is not supplied (close) Power supply is supplied (open)
ABS IN valve Power supply is not supplied (open) Power supply is not supplied (open)
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SYSTEMBRC-15
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
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Front RH brake caliper• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are open, the fluid pressure applied on the front RH brake ca liper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valv e 1. The pressurization for the right caliper is con-
trolled separately from the left caliper.
Front LH brake caliper
• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are open, the fluid pressure applied on the front LH brake caliper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valv e 2. The pressurization for the left caliper is con-
trolled separately from the right caliper.
Rear RH wheel cylinder• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are open, the fluid pressure applied on the rear RH wheel cylinder is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut va lve 2. The pressurization for the right wheel cylinder
is controlled separately from the left wheel cylinder.
Rear LH wheel cylinder• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are open, the fluid pressure applied on the rear LH wheel cylinder is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valv e 1. The pressurization for the left wheel cylinder is
controlled separately from the right wheel cylinder.
Component Parts and Function
VALVE OPERATION (ABS AND EBD FUNCTIONS)
The control unit built into the ABS actuator and electric unit (control unit) controls fluid pressure of the brake
calipers by operating each valve.
Name Not activatedDuring pressure decreases
Cut valve 1 Power supply is not supplied (open) Power supply is not supplied (open)
Cut valve 2 Power supply is not supplied (open) Power supply is not supplied (open)
Suction valve 1 Power supply is not supplied (close) Power supply is not supplied (close)
Suction valve 2 Power supply is not supplied (close) Power supply is not supplied (close)
ABS IN valve Power supply is not supplied (open) Power supp ly is not supplied (open)
ABS OUT valve Power supply is not supplie d (close) Power supply is not supplied (close)
Each brake caliper and each wheel cylinder
(fluid pressure) —
Pressure decreases
Component Function
Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pump according to signals from ABS actuator and electric unit (control unit).
Cut valve 1
Cut valve 2 Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Return check valve Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice
of each valve when brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreas-
es when decreasing pressure of brake caliper and wheel cylinder.
Pressure sensor Detects the brake fluid pressure and tr ansmits signal to ABS ac tuator and electric unit (control unit).
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