sensor NISSAN LATIO 2011 Service Repair Manual

BRC-34
< SERVICE INFORMATION >[ABS]
WHEEL SENSORS
• When installing front wheel senso
r, press rubber grommets of strut bracket and body all the way in
until they get locked, and be careful not to apply a twist to harness. Harness should not be twisted
after installation. (Install it with harness paint mark on body side grommet facing front of vehicle,
and the strut side grommet facing outside of vehicle.)
REAR WHEEL SENSOR
Removal
CAUTION:
• As much as possible, avoid rotating wheel sensor when removing it . Pull wheel sensors out without
pulling on sensor harness.
• Take care to avoid damaging wheel sensor edges or rotor teeth. Remove wheel sensor first before
removing front or rear wheel hub. This is to avoid damage to wheel sensor wiring and loss of sensor
function.
1. Disconnect the rear wheel sensor connector.
2. Remove the rear wheel sensor.
Installation
Installation is in the reverse order of removal.
CAUTION:
• When installing, make sure there is no foreign material such as iron chips on and in the mounting
hole of the wheel sensor. Make sure no foreign material has been caught in the sensor rotor. Remove
any foreign material and clean the mount.
• When installing rear wheel sensor, press rubber grommets of suspension arm bracket and harness
of side member all the way in until they get locked , and be careful not to apply a twist to harness.
Harness should not be twisted af ter installation. (Aim the paint mark upward of vehicle.)
Revision: May 2010 2011 Versa

SENSOR ROTORBRC-35
< SERVICE INFORMATION > [ABS]
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SENSOR ROTOR
Removal and InstallationINFOID:0000000005928458
The front and rear sensor rotors are part of the hub and bearing assembly and cannot be removed separately.
To replace the front or rear sensor rotors, t he hub and bearing assembly must be replaced. Refer to FA X - 6 ,
"Removal and Installation" (front axle), RAX-6, "Removal and Installation" (rear axle).
Revision: May 2010 2011 Versa

BRC-38
< SERVICE INFORMATION >[VDC/TCS/ABS]
PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint Syst
em (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005928460
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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
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 incorrect 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 SRS 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 3 minu tes before performing any service.
Precautions Necessary for Steering Wheel Rotation after Battery Disconnect
INFOID:0000000005928461
NOTE:
• Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect bot h battery cables.
• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
This vehicle is equipped with a push-button ignition switch and a steering lock unit.
If the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the bat tery disconnected or discharged, follow the procedure
below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Carry the Intelligent Key or insert it to the key sl ot and turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock will remain released with both battery cables discon- nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
Revision: May 2010 2011 Versa

BRC-40
< SERVICE INFORMATION >[VDC/TCS/ABS]
PRECAUTIONS
• Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw
rate/side/decel G sensor to indicate a problem. This is not a problem if normal operation can be resumed
after restarting the engine.
Precaution for CAN SystemINFOID:0000000005928464
• Do not apply voltage of 7.0V or higher to terminal to be measured.
• Maximum open terminal voltage of test er in use must be less than 7.0V.
• Before checking harnesses, turn ignition sw itch OFF and disconnect battery negative cable.
• Area to be repaired must be soldered and wrapped with tape. Make sure that fraying of twisted wire is within 110 mm (4.33 in).
• Do not make a bypass connection to repaired area. (If the circuit is bypassed, characteristics of twisted wire will be lost.)
PKIA0306E
PKIA0307E
Revision: May 2010 2011 Versa

PREPARATIONBRC-41
< SERVICE INFORMATION > [VDC/TCS/ABS]
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PREPARATION
Special Service ToolINFOID:0000000005928465
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolINFOID:0000000005928466
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: May 2010 2011 Versa

SYSTEM DESCRIPTIONBRC-43
< SERVICE INFORMATION > [VDC/TCS/ABS]
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TCS FunctionINFOID:0000000005928470
• Spinning of the drive wheels is detected by the ABS/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 sluggi sh 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:0000000005928471
• 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 driving 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 controlling 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, restart 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:0000000005928472
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 increases as the wheel speed
increases.
The rear sensor units consist of wheel 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:0000000005928473
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the 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: May 2010 2011 Versa

BRC-46
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis
for Quick and Accurate RepairINFOID:0000000005928476
INTRODUCTION
The ABS/TCS/VDC system has an elec tronic 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. Mo st 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 for “conventional” malfunctions first.
This is one of the best ways to troubleshoot brake malfunctions on
an ABS/TCS/VDC equipped vehicle. Al so check related Service Bul-
letins for information.
SEF233G
SEF234G
Revision: May 2010 2011 Versa

BRC-50
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
ALFIA0188ZZ
1. ABS actuator and electric unit (control
unit) E33 2. Brake fluid level switch E40 3. Stop lamp switch E13
4. Front wheel sensor LH E51 Front wheel sensor RH E52 5. Yaw rate/side/decel G sensor B3
(driver seat and carpet removed for
clarity) 6. Rear wheel sensor LH B123
Rear wheel sensor RH B124
7. Parking brake switch M17 8. VDC OFF switch M349. Steering angle sensor M64 (steering
wheel removed for clarity)
10. Combination meter M24
Revision: May 2010 2011 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: May 2010 2011 Versa

TROUBLE DIAGNOSISBRC-59
< SERVICE INFORMATION > [VDC/TCS/ABS]
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ACCEL POS SIG Open/close condition
of throttle valve (linked
with accelerator pedal)Accelerator pedal not de-
pressed (ignition switch is ON)
0%
BRC-79, "
CAN Commu-
nication System Inspec-
tion"Depress accelerator pedal (ig-
nition switch is ON) 0 to 100%
SIDE G-SENSOR Transverse G detected
by side G-sensorVehicle stopped
Approx. 0 m/s
2
BRC-70, "Yaw Rate/Side/
Decel G Sensor System
Inspection"
Vehicle turning rightnegative value (m/
s2)
Vehicle turning left positive value (m/
s
2)
STR ANGLE SIG Steering angle detect-
ed by steering angle
sensorStraight-ahead
Approx. 0°BRC-69, "
Steering Angle
Sensor System Inspec-
tion"Steering wheel turned –720 to 720 °
PRESS SENSOR Brake fluid pressure
detected by pressure
sensorWith ignition switch ON and
brake pedal released
Approx. 0 bar
BRC-77, "
Pressure Sen-
sor System Inspection"With ignition switch ON and
brake pedal depressed –40 to 300 bar
EBD SIGNAL EBD operation EBD is active
On
—
EBD is inactive Off
ABS SIGNAL ABS operationABS is active
On
—
ABS is inactive Off
TCS SIGNAL TCS operationTCS is active
On
—
TCS is inactive Off
VDC SIGNAL VDC operationVDC is active
On
—
VDC is inactive Off
EBD FAIL SIG EBD fail-safe signal In EBD fail safe mode On
—
EBD is normal Off
ABS FAIL SIG ABS fail-safe signal In ABS fail safe mode
On
—
ABS is normal Off
TCS FAIL SIG TCS fail-safe signal In TCS fail safe mode
On
—
TCS is normal Off
VDC FAIL SIG VDC fail-safe signal In VDC fail safe mode On
—
VDC is normal Off
CRANKING SIG Crank operation Crank is active
On
—
Crank is inactive Off
FLUID LEV SW Status of brake fluid
level switchWhen brake fluid level switch
ON
On
BRC-76, "
Brake Fluid
Level Switch System In-
spection"When brake fluid level switch
OFF Off
PARK BRAKE SW Status of parking brake
switchParking brake switch is active On
BRC-79, "
Component In-
spection"Parking brake switch is inactive Off
Monitor item Display content
Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation
Revision: May 2010 2011 Versa