2010 NISSAN LATIO brake sensor

BRC-10
< SERVICE INFORMATION >[ABS]
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis
for Quick and Accurate RepairINFOID:0000000005397032
INTRODUCTION
The ABS system has an electronic control unit to control major func-
tions. The control unit accepts input signals from sensors and con-
trols actuator operation. It is also important to check for air leaks in
the booster or brake and vacuum lines, lack of brake fluid, or other
malfunctions in the brake system.
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent conditions are
caused by poor electrical connections or damaged wiring. In this
case, careful checking of suspicious circuits may help prevent the
replacement of good parts.
A visual check only may not find t he cause of the malfunction, so a
road test should be performed.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an ABS complaint. The customer
is a very good source of informati on, especially for intermittent condi-
tions. Through the talks with the customer, find out what symptoms
are present and under what conditions they occur.
Start your diagnosis by looking for “conventional” malfunctions first.
This is one of the best ways to troubleshoot brake malfunctions on
an ABS equipped vehicle. Also check related Service Bulletins for
information.
SEF233G
SEF234G
Revision: January 20102010 Versa

BRC-20
< SERVICE INFORMATION >[ABS]
TROUBLE DIAGNOSIS
Note 1: Confirm tire pressure is normal.
Note 2: ON/OFF timing of ABS warning lamp
ON: For approximately 2 seconds after ignition switch is turned ON, or when a malfunction is detected.
OFF: Approximately 2 seconds after ignition switch is turned ON (when system is in normal operation).
CONSULT-III Function (ABS)INFOID:0000000005397039
CONSULT-III can display each diagnostic item us
ing the diagnostic test modes shown following.
Monitor itemDisplay content Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation
FR RH SENSOR
FR LH SENSOR
RR RH SENSOR
RR LH SENSOR Wheel speedVehicle stopped
0 [km/h (MPH)]
BRC-26, "
Wheel Sensor
System"Vehicle running (Note 1) Almost in accor-
dance with speed-
ometer display
(within
±10%)
BATTERY VOLT Battery voltage sup-
plied to ABS actuator
and electric unit (con-
trol unit)Ignition switch ON
10 to 16VBRC-29, "
ABS Control
Unit Power and Ground
Systems Inspection"
STOP LAMP SW
Stop lamp switch oper-
ationBrake pedal depressed ON
—
Brake pedal not depressed OFF
ABS WARN LAMP ABS warning lamp ON
condition (Note 2)ABS warning lamp ON ON
BRC-18, "
Basic Inspec-
tion"ABS warning lamp OFF OFF
MOTOR RELAY Operation status of mo-
tor and motor relayIgnition switch ON or running
(ABS not activated)
OFF
BRC-28, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"Ignition switch ON or engine
running (ABS activated) ON
ACTUATOR RLY Actuator relay opera-
tion statusVehicle stopped (Ignition
switch ON)
OFF
BRC-28, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"Vehicle stopped (Engine run-
ning) ON
FR LH IN SOL
FR LH OUT SOL
FR RH IN SOL
FR RH OUT SOL
RR RH IN SOL
RR RH OUT SOL
RR LH IN SOL
RR LH OUT SOL Solenoid valve opera-
tionActuator (solenoid) is active
(“ACTIVE TEST” with CON-
SULT-III) or actuator relay is in-
active (in fail-safe mode).
ON
BRC-27, "
Solenoid Valve
System Inspection"When actuator (solenoid) is not
active and actuator relay is ac-
tive (ignition switch ON). OFF
ABS SIGNAL
EBD SIGNAL Signal statusABS active
EBD active
ON
ABS system
EBD system
ABS not active
EBD not active OFF
ABS FAIL SIG
EBD FAIL SIG Fail signal statusABS fail
EBD fail
ON
ABS system
EBD system
ABS normal
EBD normal OFF
Diagnostic mode
Description
SELF DIAGNOSTIC RESULT Displays ABS ac tuator and electric unit (control unit) self-diagnosis results.
DATA MONITOR Displays ABS actuator and electric unit (control unit) input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
Revision: January 20102010 Versa

TROUBLE DIAGNOSES FOR SYMPTOMSBRC-31
< SERVICE INFORMATION > [ABS]
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TROUBLE DIAGNOSES FOR SYMPTOMS
ABS Works FrequentlyINFOID:0000000005397046
1.CHECK WARNING LAMP ACTIVATION
Make sure warning lamp remains off while driving.
OK or NG
OK >> GO TO 2.
NG >> Carry out self-diagnosis. Refer to BRC-20, "
CONSULT-III Function (ABS)".
2.CHECK WHEEL SENSORS
Check the following.
• Wheel sensor mounting for looseness
• Wheel sensors for physical damage
• Wheel sensor connectors for terminal damage or loose connections
• Sensor rotor and mount for physical damage
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3.CHECK WHEEL BEARINGS
Check wheel bearing axial end play. Refer to FA X - 6 , "
On-Vehicle Inspection and Service" or RAX-6, "On-Vehi-
cle Inspection and Service".
OK or NG
OK >> GO TO 4.
NG >> Repair as necessary.
4.CHECK BRAKE FLUID PRESSURE
Check brake fluid pressure distribution.
Refer to BRC-18, "
Basic Inspection".
Is brake fluid pressure distribution normal?
YES >> Inspection End.
NO >> Perform Basic Inspection. Refer to BRC-18, "
Basic Inspection".
Unexpected Pedal ActionINFOID:0000000005397047
1.CHECK WARNING LAMP ACTIVATION
Make sure warning lamp remains off while driving.
OK or NG
OK >> GO TO 2.
NG >> Carry out self-diagnosis. Refer to BRC-20, "
CONSULT-III Function (ABS)".
2.CHECK BRAKE PEDAL STROKE
Check brake pedal stroke.
Is brake pedal stroke excessive?
YES >> Perform Basic Inspection. Refer to BRC-18, "Basic
Inspection".
NO >> GO TO 3.
3.CHECK CONNECTOR AND BRAKING PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector.
SBR540A
Revision: January 20102010 Versa

BRC-32
< SERVICE INFORMATION >[ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
2. Drive vehicle and check brake operation.
NOTE:
• Stopping distance may be longer than vehicles without ABS when road condition is slippery.
• Driving the vehicle with the ABS actuator and elec tric unit (control unit) disconnected may induce DTCs
in electrical control units using CAN communication. After the inspection, clear all DTCs. Refer to LAN-
7, "System Description".
OK or NG
OK >> GO TO 4.
NG >> Perform Basic Inspection. Refer to BRC-18, "
Basic Inspection".
4.CHECK WHEEL SENSORS
Check the following.
• Wheel sensor mounting for looseness
• Wheel sensors for physical damage
• Wheel sensor connectors for terminal damage or loose connections
• Sensor rotor and mount for physical damage
OK or NG
OK >> Check ABS actuator and electric unit (contro l unit) connector terminals for deformation, discon-
nection, looseness or damage. Reconnect ABS act uator and electric unit (control unit) harness
connector. Then retest.
NG >> Repair or replace as necessary.
Long Stopping DistanceINFOID:0000000005397048
1.CHECK BASE BRAKING SYSTEM PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector.
2. Drive vehicle and check brake operation. NOTE:
• Stopping distance may be longer than vehicles without ABS when road condition is slippery.
• Driving the vehicle with the ABS actuator and elec tric unit (control unit) disconnected may induce DTCs
in electrical control units using CAN communication. After the inspection, clear all DTCs. Refer to LAN-
7, "System Description".
OK or NG
OK >> Go to BRC-31, "ABS Works Frequently".
NG >> Perform Basic Inspection. Refer to BRC-18, "
Basic Inspection".
ABS Does Not WorkINFOID:0000000005397049
CAUTION:
The ABS does not operate when the vehicle speed is 10 km/h (6 MPH) or less.
1.CHECK WARNING LAMP ACTIVATION
Turn ignition switch ON and check for warning lamp activation.
• Warning lamp should activate for approximately 2 seconds after turning the ignition switch ON.
OK or NG
OK >> Carry out self-diagnosis. Refer to BRC-20, "CONSULT-III Function (ABS)".
NG >> Go to BRC-18, "
Basic Inspection".
Pedal Vibration or ABS Operation NoiseINFOID:0000000005397050
NOTE:
During ABS activation, pedal vibration may be felt and a noise may be heard. This is normal and does not indi-
cate a malfunction.
1.CHECK SYMPTOM
1. Apply brake.
2. Start engine.
Does the symptom occur only when engine is started?
YES >> Carry out self-diagnosis. Refer to BRC-20, "CONSULT-III Function (ABS)".
Revision: January 20102010 Versa

BRC-42
< SERVICE INFORMATION >[VDC/TCS/ABS]
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000005612140
The actual shapes of Kent
-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolINFOID:0000000005612141
Tool number
(Kent-Moore No.)
Tool name Description
(J-45741)
ABS active wheel sensor tester Checking operation of ABS active wheel sen-
sor
WFIA0101E
Tool name
Description
1. Flare nut crowfoot
2. Torque wrench Removing and installing brake piping

a: 10mm (0.39 in)/12mm (0.47 in)
S-NT360
Revision: January 20102010 Versa

BRC-44
< SERVICE INFORMATION >[VDC/TCS/ABS]
SYSTEM DESCRIPTION
TCS Function
INFOID:0000000005612145
• Spinning of the drive wheels is detected by the A BS/TCS/VDC control unit using inputs from the wheel
speed sensors. If wheel spin occurs, the drive wheel right and left brake fluid pressure control and engine
fuel cut are conducted while the throttle value is restricted to reduce the engine torque and decrease the
amount of wheel spin. In addition, the throttle openi ng is controlled to achieve the optimum engine torque.
• Depending on road condition, the vehicle may have a sluggish feel. This is normal, because optimum trac- tion has the highest priority during TCS operation.
• TCS may be activated during sudden vehicle acceleration, wide open throttle acceleration, sudden transmis- sion shifts or when the vehicle is driven on a road with a varying surface friction coefficient.
• The SLIP indicator lamp flashes to inform the driver of TCS operation.
VDC FunctionINFOID:0000000005612146
• In addition to the ABS/TCS function, the driver steering amount and brake operation amount are detected
from the steering angle sensor, and the vehicle's drivi ng status (amount of under steering/over steering) is
determined using inputs from the yaw rate/side/decel G sensor, wheel speed sensors, etc. and this informa-
tion is used to improve vehicle stability by cont rolling the braking and engine torque application to the
wheels.
• The SLIP indicator lamp flashes to inform the driver of VDC operation.
• During VDC operation, the vehicle body and brake pedal may vibrate lightly and a mechanical noise may be
heard. This is normal.
• The ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp may turn on when the vehicle is
subject to strong shaking or large vibration, such as when the vehicle is on a turn table or a ship while the
engine is running or steep slope. In this case, rest art the engine on a normal road and if the ABS warning
lamp, VDC OFF indicator lamp and SLIP indicator lamp turn off, there is no problem.
Wheel SensorsINFOID:0000000005612147
The front sensor units consist of a gear-shaped sensor rotor and a
sensor element. The element contains a magnet around which a coil
is wound. The front wheel sensors are installed on the front of the
wheel knuckles. As the wheel rotates, the sensor generates a
square-wave signal. The frequency in creases as the wheel speed
increases.
The rear sensor units consist of w heel hubs with a series of internal
magnets and a sensor element. The rear wheel sensors are installed
on the inner side of the wheel knuckles. As the wheel rotates, the
sensor generates a square-wave signal. The frequency increases as
the wheel speed increases.
Fail-Safe FunctionINFOID:0000000005612148
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, t he ABS warning lamp, VDC OFF indicator lamp and SLIP
indicator lamp will turn on. In case of an electrical malfunction with the EBD system, the BRAKE warning lamp,
ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp will turn on.
LBR333
WFIA0033E
Revision: January 20102010 Versa

TROUBLE DIAGNOSISBRC-47
< SERVICE INFORMATION > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000005612151
INTRODUCTION
The ABS/TCS/VDC system has an el ectronic control unit to control
major functions. The control unit accepts input signals from sensors
and controls actuator operation. It is also important to check for con-
ventional malfunctions such as air leaks in the booster or lines, lack
of brake fluid, or other malfunctions with the brake system.
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent malfunctions are
caused by poor electrical connections or wiring. In this case, careful
checking of suspicious circuits may help prevent the replacement of
good parts.
A visual check only may not find t he cause of the malfunction, so a
road test should be performed.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an ABS/TCS/VDC complaint. The
customer is a very good source of information, especially for inter-
mittent malfunctions. Through the talks with the customer, find out
what symptoms are present and under what conditions they occur.
Start your diagnosis by looking fo r “conventional” malfunctions first.
This is one of the best ways to troubleshoot brake malfunctions on
an ABS/TCS/VDC equipped vehicle. Also check related Service Bul-
letins for information.
SEF233G
SEF234G
Revision: January 20102010 Versa

BRC-58
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Monitor item
Display content Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation
FR LH SENSOR
FR RH SENSOR
RR LH SENSOR
RR RH SENSOR Wheel speedVehicle stopped
0 [km/h (mph)]
BRC-67, "
Wheel Sensor
System Inspection"Vehicle running (Note 1) Almost in accor-
dance with speed-
ometer display
(within
±10%)
FR RH IN SOL
FR RH OUT SOL
FR LH IN SOL
FR LH OUT SOL
RR RH IN SOL
RR RH OUT SOL
RR LH IN SOL
RR LH OUT SOL Solenoid valve opera-
tionActuator (solenoid) is active
(“ACTIVE TEST” with CON-
SULT-III) or actuator relay is in-
active (in fail-safe mode).
On
BRC-72, "
Solenoid and
VDC Change-Over Valve
System Inspection"When actuator (solenoid) is not
active and actuator relay is ac-
tive (ignition switch ON). Off
STOP LAMP SW Brake pedal operation Brake pedal depressed On
BRC-74, "
Stop Lamp
Switch System Inspec-
tion"Brake pedal releasedOff
MOTOR RELAY Operation status of mo-
tor and motor relayIgnition switch ON or engine
running (ABS not operated)
Off
BRC-73, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"
Ignition switch ON or engine
running (ABS operated) On
ACTUATOR RLY Actuator relay opera-
tion statusVehicle stopped (Ignition
switch ON)
Off
Vehicle stopped (Engine run-
ning) On
ABS WARN LAMP ABS warning lamp ON
condition (Note 2)ABS warning lamp ON On
BRC-83, "
ABS Warning
Lamp Does Not Come On
When Ignition Switch Is
Turned On"ABS warning lamp OFF Off
OFF LAMP VDC OFF indicator
lamp status (Note 2) When VDC OFF indicator
lamp is ON
On
BRC-79, "
CAN Commu-
nication System Inspec-
tion"When VDC OFF indicator
lamp is OFF Off
OFF SW VDC OFF switch
ON/OFF status VDC OFF switch ON
(When VDC OFF indicator
lamp is ON)
On
BRC-79, "
Component In-
spection"VDC OFF switch OFF
(When VDC OFF indicator
lamp is OFF) Off
SLIP LAMP SLIP indicator lamp
status (Note 2)When SLIP indicator lamp is
ON
On
BRC-79, "
CAN Commu-
nication System Inspec-
tion"When SLIP indicator lamp is
OFF Off
BATTERY VOLT Battery voltage sup-
plied to ABS actuator
and electric unit (con-
trol unit)Ignition switch ON
10 to 16VBRC-75, "
ABS/TCS/VDC
Control Unit Power and
Ground Systems Inspec-
tion"
GEAR
Manual mode gear po-
sition determined by
TCMIgnition switch ON 1
2
3
4
5—
YAW RATE SEN Yaw rate detected by
yaw rate/side G sensorVehicle stopped
Approx. 0 d/sBRC-70, "
Yaw Rate/Side/
Decel G Sensor System
Inspection"Vehicle turning –75 to 75 d/s
Revision: January 20102010 Versa