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BRC

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BRAKE CONTROL SYSTEM

F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
ABS Active Test ............................................................. 21
. BRC
OPERATION PROCEDURE ............................... 21 .
PRECAUTIONS ......................................................... 3. SOLENOID VALVE ............................................. 22 .
Precautions for Supplemental Restraint System ABS MOTOR ...................................................... 22 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- For Fast and Accurate Diagnosis .......................... 23 .
SIONER" ................................................................. 3
. PRECAUTIONS FOR DIAGNOSIS .................... 23 .
Precautions for Brake System ................................. 3 . Basic Inspection .................................................... 23 .
Precautions for Brake Control ................................. 3 . H
BASIC INSPECTION 1 BRAKE FLUID LEVEL,
PREPARATION .......................................................... 4
. LEAKS, AND BRAKE PADS ............................... 23 .
Special Service Tools (SST) .................................... 4 . BASIC INSPECTION 2 POWER SYSTEM TER-
SYSTEM DESCRIPTION ........................................... 5 . MINAL LOOSENESS AND BATTERY INSPEC- I
System Diagram ...................................................... 5
. TION ................................................................... 23
.
Functions ................................................................. 5
. BASIC INSPECTION 3 ABS WARNING LAMP
Operation That Is Not "System Error" ..................... 5 . AND BRAKE WARNING LAMP INSPECTION ... 24 J
Fail-Safe Function ................................................... 5
. Inspection 1 Wheel Sensor System ....................... 24 .
ABS, EBD SYSTEM ............................................. 5 . Inspection 2ABSActuatorandElectricUnit(Control
Hydraulic Circuit Diagram ....................................... 6 . Unit) ....................................................................... 26
.
CAN COMMUNICATION ........................................... 7 . K
Inspection 3 ABS Actuator Relay or ABS Motor
System Description ................................................. 7. Relay Circuit .......................................................... 26
.
TROUBLE DIAGNOSIS ............................................. 8 . Inspection 4 CAN Communication Circuit ............. 28 .
How to Perform Trouble Diagnosis for Quick and Inspection 5ABSActuatorandElectricUnit(Control L
Accurate Repair ...................................................... 8
. Unit) Power Supply and Ground Circuit ................. 28 .
INTRODUCTION .................................................. 8 . Inspection 6 Brake Fluid Level Switch Circuit ........ 30 .
DIAGNOSIS FLOWCHART ................................. 9 . Inspection 7 Parking Brake Switch Circuit ............. 32 . M
ASKING COMPLAINTS ..................................... 10 . Inspection 8 Warning lamp system ........................ 33 .
EXAMPLE OF DIAGNOSIS SHEET .................. 10 . Symptom 1: Excessive ABS Function Operation
Component Parts Location .....................................11 . Frequency .............................................................. 33
.
Schematic -- ABS -- ............................................ 12 . Symptom 2: Unexpected Pedal Reaction .............. 34 .
Wiring Diagram -- ABS -- .................................... 13 . Symptom 3: The Stopping Distance Is Long ......... 34 .
CONSULT- II Functions ......................................... 17 . Symptom 4: ABS Function Does Not Operate ...... 35 .
CONSULT-II MAIN FUNCTION .......................... 17 . Symptom 5: Pedal Vibration or ABS Operation
CONSULT-IIBASICOPERATIONPROCEDURE Sound Occurs ........................................................ 35 .
... 17 Symptom 6: ABS Warning Lamp Indication Is Not
Self-Diagnosis ....................................................... 18
. Normal ................................................................... 35
.
OPERATION PROCEDURE .............................. 18 . WHEEL SENSORS .................................................. 37 .
ERASE MEMORY .............................................. 18 . Removal and Installation ....................................... 37 .
DISPLAY ITEM LIST .......................................... 18 . REMOVAL .......................................................... 38 .
Data Monitor .......................................................... 20
. INSTALLATION .................................................. 38 .
OPERATION PROCEDURE .............................. 20 .
DISPLAY ITEM LIST .......................................... 20 .

BRC-1
SENSOR ROTOR ..................................................... 39 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ...40
Removal and Installation ....................................... 39 . Removal and Installation ...................................... ..40
.
FRONT ............................................................... 39
. REMOVAL ...........................................................40
.
REAR .................................................................. 39
. INSTALLATION ...................................................41
.

BRC-2
PRECAUTIONS
[ABS]
PRECAUTIONS
[ABS] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EFS006DM

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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 SRS and SB section of
this Service Manual. C
WARNING:
q To avoid rendering the SRS inoperative, 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 per-
formed by an authorized NISSAN/INFINITI dealer. D
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. E
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors. BRC
Precautions for Brake System EFS005TG

q Recommended fluid is brake fluid "DOT 3" or "DOT 4". G
q Never reuse drained brake fluid.
q Be careful not to splash brake fluid on painted areas.If brake fluid is splashed, wipe it off and flush area
with water immediately. H
q Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic system.
q Use flare nut wrench when removing flare nuts, and use a flare
nut torque wrench when tighten flare nuts. I
q Brake system is an important safety part.If a brake fluid leak is
detected, always disassemble the affected part.If a malfunction
is detected, replace part with new one. J
q Before working, turn ignition switch OFF and disconnect con-
nector of ABS actuator and electric unit (control unit) or the bat-
tery cables.
K
q When installing brake tube and hose, be sure to torque.
WARNING: SBR820BA
Clean brake pads and shoes with a waster cloth, then wipe with L
a dust collector.
Precautions for Brake Control EFS005TH

q Just after starting vehicle after ignition switch ON, brake pedal may vibrate or motor operating noise may M
be heard from engine room. This is a normal status of operation check.
q Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
q When an error is indicated by ABS or another warning lamp, collect all necessary information from cus-
tomer (what symptoms are present under what conditions) and check for simple causes before starting
diagnostic servicing. Besides electrical system inspection, check brake booster operation, brake fluid
level, and fluid leaks.
q If tyre size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts,
stopping distance or steering stability may deteriorate.
q If there is a radio, antenna, or antenna lead-in wire (including wiring) near control module, ABS function
may have a malfunction or error.
q If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
pinches, open circuits, and improper wiring.

BRC-3
PREPARATION
[ABS]
PREPARATION PFP:00002

Special Service Tools (SST) EFS005TI

Tool number
Description
Tool name

GG94310000
Flare nut torque wrench Installing brake tube and hose
a:10 mm (0.39 in)

NT406

ST30720000
Drift
a: 77 mm (0.03 in) dia.
b: 55 mm (2.17 in) dia.

ZZA0701D

ST27863000
Drift
Installation rear sensor rotor
a: 75 mm (2.95 in) dia.
b: 62 mm (2.44 in) dia.

ZZA0832D

KV40104710
Drift
a: 76 mm (2.99 in) dia.
b: 68.5 mm (2.697 in) dia.

ZZA0832D

BRC-4
SYSTEM DESCRIPTION
[ABS]
SYSTEM DESCRIPTION PFP:00000
A
System Diagram EFS005TJ

BRC

SFIA3001E
G

Functions EFS005TK

ABS H
q The Anti-Lock Brake System is a function that detects wheel revolution while braking, and it improves
handling stability during sudden braking by electrically preventing 4 wheels lock. Maneuverability is also
improved for avoiding obstacles. I
q Electrical system diagnosis by CONSULT-II is available.
EBD
q Electronic Brake Distributor is a function that detects subtle slippages between the front and rear tyre dur- J
ing braking, and it improves handling stability by electrically controlling the brake fluid pressure which
results in reduced rear tyre slippage.
q Electrical system diagnosis by CONSULT-II is available. K

Operation That Is Not "System Error" EFS005TL

ABS L
q When starting engine or just after starting vehicle, brake pedal may vibrate or the motor operating noise
may be heard from engine room. This is a normal states of the operation check.
q During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal. M
q Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
Fail-Safe Function EFS005TM

ABS, EBD SYSTEM
In case of electrical malfunction with ABS, ABS warning lamp will turn on. In case of electrical incidents with
EBD, brake warning lamp and ABS warning lamp will turn on. Simultaneously, ABS become one of following
conditions of Fail-Safe function.
1. For ABS malfunction, only EBD is activated and condition of vehicle is same condition of vehicles without
ABS system.
NOTE:
ABS self-diagnosis sound may be heard.That is a normal condition because a self-diagnosis for "Ignition
switch ON" and "The first starting" are being performed.
2. For EBD malfunction, EBD and ABS become inoperative, and condition of vehicle is same as condition of
vehicles without ABS, EBD system.

BRC-5
SYSTEM DESCRIPTION
[ABS]
Hydraulic Circuit Diagram EFS005TN

SFIA3205E

BRC-6
CAN COMMUNICATION
[ABS]
CAN COMMUNICATION PFP:23710
A
System Description EFS005TO

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec- B
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. Refer to LAN-30, "CAN C
Communication Unit" .

BRC

BRC-7
TROUBLE DIAGNOSIS
[ABS]
TROUBLE DIAGNOSIS PFP:00004

How to Perform Trouble Diagnosis for Quick and Accurate Repair EFS005TP

INTRODUCTION
q Most important point to perform diagnosis is to understand systems (control and mechanism) in vehicle
thoroughly.

q It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
NOTE:
Customers are not professionals. Do not assume "maybe cus-
tomer means..." or "maybe customer mentioned this symptom".

EFJ0028D

q It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
q After diagnosis, make sure to perform "erase memory". Refer to
BRC-18, "ERASE MEMORY" . SEF233G

q For an intermittent malfunction, move harness or harness con-
nector by hand to check poor contact or false open circuit.
q Always read "GI General Information" to confirm general precautions. Refer to GI-4, "General Precau-
tions" .

BRC-8
TROUBLE DIAGNOSIS
[ABS]
DIAGNOSIS FLOWCHART
A

BRC

SFIA0953E

BRC-9
TROUBLE DIAGNOSIS
[ABS]
ASKING COMPLAINTS
q Complaints against malfunction vary depending on each person.
It is important to clarify customer complaints.
q Ask customer about what symptoms are present and under
what conditions. Use information to reproduce symptom while
driving.
q It is also important to use the diagnosis sheet so as not to miss
information.

SBR339B

EXAMPLE OF DIAGNOSIS SHEET

LFIA0176E

BRC-10
TROUBLE DIAGNOSIS
[ABS]
Component Parts Location EFS005TQ

BRC

SFIA3227E

BRC-11
TROUBLE DIAGNOSIS
[ABS]
Schematic -- ABS -- EFS005TR

MFWA0130E

BRC-12
TROUBLE DIAGNOSIS
[ABS]
Wiring Diagram -- ABS -- EFS005TS

BRC

MFWA0131E

BRC-13
TROUBLE DIAGNOSIS
[ABS]

MFWA0132E

BRC-14
TROUBLE DIAGNOSIS
[ABS]

BRC

MFWA0133E

BRC-15
TROUBLE DIAGNOSIS
[ABS]

MFWA0116E

BRC-16
TROUBLE DIAGNOSIS
[ABS]
CONSULT- II Functions EFS005TT

CONSULT-II MAIN FUNCTION A
In a diagnosis function (main function), there are "SELF-DIAG RESULTS", "DATA MONITOR", "CAN DIAG
SUPPORT MNTR", "ACTIVE TEST", "FUNCTION TEST", "ECU PART NUMBER".
Diagnostic B
Function Reference
test mode
SELF-DIAG
Self-diagnostic results can be read and erased quickly. BRC-18, "Self-Diagnosis"
RESULTS C
DATA MONI-
Input/Output data in the ABS actuator and electric unit (control unit) can be read. BRC-20, "Data Monitor"
TOR
CAN DIAG D
LAN-15, "CAN Diagnostic
SUPPORT The results of transmit/receive diagnosis of communication can be read.
Support Monitor"
MNTR

ACTIVE
Diagnostic Test Mode in which CONSULT-II drives some actuators apart from E
the ABS actuator and electric unit (control unit) and also shifts some parameters BRC-21, "Active Test"
TEST
in a specified range.
Separate volume "CON- BRC
FUNCTION Performed by CONSULT-II instead of a technician to determine whether each
SULT-II OPERATION MAN-
TEST system is "OK" or "NG".
UAL (FUNCTION TEST)"
ECU PART
ABS actuator and electric unit (control unit) part number can be read. -- G
NUMBER

CONSULT-II BASIC OPERATION PROCEDURE
1. Touch "ABS" in "SELECT SYSTEM" screen. H

BCIA0030E K
2. Select required diagnostic location from "SELECT DIAG MODE"
screen.
L

BCIA0031E

BRC-17
TROUBLE DIAGNOSIS
[ABS]
Self-Diagnosis EFS005TU

OPERATION PROCEDURE
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data link connector.
3. Turn ignition switch ON.
4. Start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute.
5. After stopping vehicle, with engine running, touch "START (NISSAN BASED VHCL)", "ABS", "SELF-DIAG
RESULTS" in order on CONSULT-II screen.
CAUTION:
If "START (NISSAN BASED VHCL)" is touched immediately after starting engine or turn on the
ignition switch, "ABS" might not be displayed in the "SELECT SYSTEM" screen. In this case,
repeat the operation from step 1.
6. The self-diagnostic results are displayed. (Touch "PRINT" to print out self-diagnostic results, If necessary.)
q Check ABS warning lamp if "NO FAILURE" is displayed.

7. Perform the appropriate inspection from display item list, and repair or replace the malfunctioning compo-
nent. Refer to BRC-18, "Display Item List" .
8. Start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute.
CAUTION:
When the wheel sensor malfunctions, after inspecting the wheel sensor system, the ABS warning
lamp and brake warning lamp will not turn off even when the system is normal unless the vehicle
is driving at 30 km/h (19MPH) or more for approximately 1 minute.
ERASE MEMORY
1. Turn ignition switch OFF.
2. Start engine and touch "START (NISSAN BASED VHCL)", "ABS", "SELF-DIAG RESULTS", "ERASE
MEMORY" in order on CONSULT-II screen to erase the error memory.
If "ABS" is not indicated, go to GI-50, "CONSULT-II Data Link Connector (DLC) Circuit" .
CAUTION:
If the error memory is not erased, re-perform the operation from step 4.
3. Perform self-diagnosis again, and make sure that diagnostic memory is erased.
4. Drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute as the final inspection, and make
sure that the ABS warning lamp turn off.
DISPLAY ITEM LIST
Self-diagnostic item Malfunction detecting condition Check system
RR RH SENSOR-1 Circuit of rear RH wheel sensor is open.
RR LH SENSOR-1 Circuit of rear LH wheel sensor is open.
FR RH SENSOR-1 Circuit of front RH wheel sensor is open.
FR LH SENSOR-1 Circuit of front LH wheel sensor is open.
When the circuit in the rear RH wheel sensor is short-circuited. Or
when the sensor power voltage is outside the standard. When the
RR RH SENSOR-2
distance between the wheel sensor and sensor rotor is too large
and the sensor pulse cannot be recognized by the control unit.
When the circuit in the rear LH wheel sensor is short-circuited. Or BRC-24, "Inspection 1
when the sensor power voltage is outside the standard. When the Wheel Sensor System"
RR LH SENSOR-2 (Note 1)
distance between the wheel sensor and sensor rotor is too large
and the sensor pulse cannot be recognized by the control unit.
When the circuit in the front RH wheel sensor is short-circuited. Or
when the sensor power voltage is outside the standard. When the
FR RH SENSOR-2
distance between the wheel sensor and sensor rotor is too large
and the sensor pulse cannot be recognized by the control unit.
When the circuit in the front LH wheel sensor is short-circuited. Or
when the sensor power voltage is outside the standard. When the
FR LH SENSOR-2
distance between the wheel sensor and sensor rotor is too large
and the sensor pulse cannot be recognized by the control unit.

BRC-18
TROUBLE DIAGNOSIS
[ABS]
Self-diagnostic item Malfunction detecting condition Check system
A
BRC-28, "Inspection 5
ABS Actuator and Elec-
BATTERY VOLTAGE
ABS actuator and electric unit (control unit) power voltage is too low. tric Unit (Control Unit)
[MALFUNCTION]
Power Supply and B
Ground Circuit"
BRC-26, "Inspection 2
CONTROLLER FAILURE Internal malfunction of ABS actuator and electric unit (control unit) ABS Actuator and Elec-
tric Unit (Control Unit)"
C
During actuator motor operation with ON, when actuator motor turns BRC-26, "Inspection 3
OFF or when control line for actuator motor relay is open. ABS Actuator Relay or
PUMP MOTOR D
During actuator motor operation with OFF, when actuator motor ABS Motor Relay Cir-
turns ON or when control line for relay is shorted to ground. cuit"

BRC-24, "Inspection 1
ABS SENSOR E
Wheel sensor input is malfunction. Wheel Sensor System"
[MALFUNCTION SIGNAL]
(Note 1)
When the control unit detects an error in the front LH inlet solenoid
FR LH IN ABS SOL
circuit. BRC
When the control unit detects an error in the front LH outlet solenoid
FR LH OUT ABS SOL
circuit.
When the control unit detects an error in the front RH inlet solenoid G
FR RH IN ABS SOL
circuit.
When the control unit detects an error in the front RH outlet solenoid
FR RH OUT ABS SOL
circuit. BRC-26, "Inspection 3 H
ABS Actuator Relay or
When the control unit detects an error in the rear LH inlet solenoid
RR LH IN ABS SOL ABS Motor Relay Cir-
circuit.
cuit"
When the control unit detects an error in the rear LH outlet solenoid I
RR LH OUT ABS SOL
circuit.
When the control unit detects an error in the rear RH inlet solenoid
RR RH IN ABS SOL
circuit. J
When the control unit detects an error in the rear RH outlet solenoid
RR RH OUT ABS SOL
circuit.
ACTUATOR RLY When the control unit detects an error in the actuator relay circuit. K
BRC-28, "Inspection 4
CAN COMM CIRCUIT
When there is an error in the CAN communications. CAN Communication
[U1000]
Circuit" (Note 2)
L
Note 1: After completing repairs of shorted sensor circuit, when ignition switch is turned ON, ABS warning lamp turns on. Make sure that
ABS warning lamp turns off while driving vehicle at 30 km/h (19 MPH) or more for approximately 1 minute according to self-diagnosis
procedure. In addition, if wheel sensor 2 is displayed for wheels, check wheel sensor circuit and also check control unit power voltage.
Note 2: When errors are detected in several systems, including CAN communication system [U1000], troubleshoot CAN communication M
circuit. Refer to BRC-28, "Inspection 4 CAN Communication Circuit" .

BRC-19
TROUBLE DIAGNOSIS
[ABS]
Data Monitor EFS005TV

OPERATION PROCEDURE
1. Touch "START (NISSAN BASED VHCL)", "ABS", "DATA MONITOR" in order on CONSULT-II screen.
CAUTION:
When "START (NISSAN BASED VHCL)" is touched immediately after starting engine or turning on
ignition switch, "ABS" might not be displayed in "SELECT SYSTEM" screen. In this case, repeat
the operation from step 1.
2. At the monitor item selection screen, touch one of the item "ECU INPUT SIGNALS", "MAIN SIGNALS" or
"SELECTION FROM MENU".
3. Touch "START" to proceed to the data monitor screen.
DISPLAY ITEM LIST
CAUTION:
The display shows the control unit calculation data, so a normal value might be displayed even in the
event the output circuit (harness) is open or short-circuited.
E:ECU INPUT SIGNALS M:MAIN SIGNALS S:SELECTION FROM MENU

SELECT Data monitor
MONITOR Monitor item Display content Reference value in
ITEM Condition
normal operation

FR LH SENSOR 0 [km/h] Vehicle stopped
FR RH SENSOR Nearly matches the speed-
E, M, S Wheel speed Vehicle running
RR LH SENSOR ometer display (

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