1995 NISSAN ALMERA N15 brakes

ANTI-LOCKBRAKESYSTEM
Purpose

The Anti-Lock BrakeSystem (ABS)consists ofelectronic andhydraulic components. Itallows forcon-
trol ofbraking forcesothat locking ofthe wheels canbeavoided.
The ABS:
1) Improves propertracking performance throughsteering wheeloperation.
2) Eases obstacles tobe avoided throughsteering wheeloperation.
3) Improves vehiclestability bypreventing flatspins.

Operation

• When thevehicle speedisless than 10km/h (6MPH) thissystem doesnotwork.
• The Anti-Lock BrakeSystem (ABS)hasself-test capabilities. Thesystem turnsonthe ABS warning
light for1second afterturning theignition switchON.The system performs anothertestthefirst time
the vehicle reaches 6km/h (4MPH). Amechanical noisemaybeheard asthe ABS performs aself-
test. This isanormal partofthe self-test feature.Ifa malfunction isfound during thischeck, theABS
warning lightwillcome on.
• During ABSoperation, amechanical noisemaybeheard. Thisisanormal condition.

ABS Hydraulic Circuit

G)
Inletsolenoid valve

@
Outlet solenoid valve

@
Reservoir

@)
Pump
)(

@

@
Motor

@
Inletvalve

(J)
Outlet valve
@ Bypass checkvalve

BR-38 @

Check valve

@)
Damper

@
Gradient switch
SBR918C

ANTI-LOCKBRAKESYSTEM
System Components

Dual proportioning
valve
Rearwheel sensors
For LHD models, controlunit
is located onthe opposite side.

SBR048DB

Control unit

s::';o~'~W.
r Magnetic flux~ _~-Coil

I .I

Tooth~ Sensorrotor
/ ~m~f onetooth

v:~-- System
Description
SENSOR

The sensor unitconsists ofagear-shaped sensorrotoranda
sensor element. Theelement contains abar magnet around
which acoil iswound. Thesensor isinstalled onthe back side
of the brake rotor.Sine-wave currentisgenerated bythe sen-
sor asthe wheel rotates. Thefrequency andvoltage increase(s) •
as the rotating speedincreases. :•

V: Induced electromotive force

SBR124B
SBR049DA CONTROL
UNIT

The control unitcomputes thewheel rotating speedbythe sig-
nal current sentfrom thesensor. Thenitsupplies aDC current
to the actuator solenoid valve.Italso controls ON-OFFopera-
tion ofthe valve relayandmotor relay.Ifany electrical malfunc-
tion should bedetected inthe system, thecontrol unitcauses
the warning lamptolight up.Inthis condition, theASS willbe
deactivated bythe control unit,andthevehicle's brakesystem
reverts tonormal operation.

BR-39

ANTI-LOCKBRAKESYSTEM
Removal andInstallation
CAUTION: Be careful nottodamage sensoredgeandsensor rotorteeth.
When removing thefront orrear wheel hubassembly, discon-
nect theABS wheel sensor fromtheassembly andmove it
away.
FRONT WHEEL SENSOR
Front wheel sensor (LH) ~!Ii

3.9-5.9 (0.4 -0.6, 35-52)
~: Nom (kg-m, ft-lb)
~: Nom(kg-m, in-Ib)

SBR030DA
REAR WHEEL SENSOR
BR-40
\

L
Rear wheel sensor (LH)

~: Nom (kg-m, ft-Ib)
~: Nom(kg-m, in-Ib)

SBR031DA

ANTI-LOCKBRAKESYSTEM

Removal andInstallation (Cont'd)

SENSOR ROTOR

Removal
1. Remove thedrive shaftandrear wheel hub.Refer toFA
section ("DriveShaft",FRONTAXLE") andRAsection
("Wheel Hub",REARAXLE").
2. Remove thesensor rotorusing suitable puller,driftand
bearing replacer.
Suitable drift

SBR873CA
Installation
Install thesensor rotor.Forfront sensor rotor,usehammer and
wooden block.Forrear sensor rotor,usesuitable driftand
press.
• Always replace sensorrotorwithnewone.

SBR985C
•

• Pay attention tothe dimension ofrear sensor rotorasshown
in figure.
h: 4.5 -5.5 mm (0.177 -0.217 in)

CONTROL UNIT

Location: Passenger side,behind dashsidelower finisher.
• Make surethatthesensor shieldground cableissecured
with mounting bolt.

SBR986C

Suitable
drift

B,.,k" ~ ABS
.'0"'" ","

Dash side ~
lower finisher ~3.9_5.9 N.m

(0.4 -0.6 kg-m,

35 -52 In-Ib)
SBR032DA

Rear
sensor rotor

BR-41

ANTI-LOCKBRAKESYSTEM
Removal andInstallation (Cont'd)

1. Disconnect batterycable.
2. Drain brake fluid.Refer toSR-5.
3. Discharge airconditioner refrigerant.RefertoHA section
("R-134a ServiceProcedure", "SERVICEPROCEDURES").
4. Disconnect allconnectors fromASSrelay bracket.
5. Remove mounting boltforrelay bracket.
6. Remove ASSrelay boxwith bracket.
7. Remove airconditioner low-pressure tubes.RefertoHA
section, ("Refrigerant Lines","SERVICE PROCEDURES") .
8. Disconnect brakepipesandmove awayfromactuator.

It is not necessary toremove thesepipesfromvehicle.

9. Remove/loosen mountingnutsbetween actuatorand
bracket.

BR-43
•

ANTI-LOCKBRAKESYSTEM
Removal andInstallation (Cont'd)

10. Draw outASS actuator asshown.

ASS
actuator

SBR039D CAUTION:
After installation, payattention tothe following points:
• Refill brake fluidandbleed air.Refer to"CHECK AND
ADJUSTMENT", BR-5and"AIR BLEEDING", BR.6,respec-
tively.
• Charge airconditioner refrigerant.RefertoHA section,
("R-134a ServiceProcedure", "SERVICEPROCEDURES").

• The installation procedureisthe reverse ofremoval.

ASS
actuator

_-=--=--=--=--_-_-\,_~
""'~t"
b"ok.,

SBR040D
ABSRELAYS

1. Disconnect batterycable.
2. Remove ASSrelay cover.

BR-44

ANTI-LOCKBRAKESYSTEM
Wiring Diagram -ABS -

BR-ABS-01

•

ABS
CONTROL
UNIT

(B111)

LHDmodels

@:
RHOmodels
Refer
to
EL-POWER.
FUSE
BLOCK
(JIB)

~

GY

ffi
IGN
SW
Y

I~I COMBINATION
METER
(ABS WARNING
LAMP)

~@
LIB
@

I

GY
LIB

$-------$
GY (~) LIB

I-

e-
LIB~ ToBR-ABS-O?

I

LIB

13-0
I

FAIL
LAMP
IGNITION
SWITCH
ON orSTART
STOP
DEPRESED LAMP
SWITCH
RELEASED ~

~
P!L

•

~:I
P!L

rn~
I
JUNCTION

BOX
NO.2

(JOINT

CONNECTORS)

1!:i=!J~
PIL

~~
•

PIL

lelIl

9F'~
P!L

14-81

STOP
LAMP
SW

Fa~
l..1..@
B ~~(B115)
5 6
TI1910
1112 W
Refer
tolast page
(Foldout page).

~---------------------------------,

L ~

HBR002
BR-45

ANTI-LOCKBRAKESYSTEM
Wiring Diagram -ABS -(Coni' d)

BR-ABS-02

ABS

CONTROL

UNIT

(!ID1)

OrAG
L TXD RXD

~ 1~61~

ORIB ~ GY!L GIB

I$~ ~
~ciJ~ ---
~~I

ORIB
GY/L GIB

It It

GY!L
GIB

cr
l I~
i~MO~o~?ic~g~)

~:
JOINT CONNECTOR-5

~ 1*.21~:
GY/L GIB

I I

GY/L
GIB

m
r1l

ORIB

rtl

FUSE
Referto
7 .5A BLOCK EL-POWER.

rn
(JIB)

~

IGNITION
SWITCH
ON orSTART

I
DATALINK
CONNECTOR
FOR CONSULT

(M13)

-----------------------

<0:
LHDmodels

RHOmode Is

@:
GAengine andSRengine

@:
CD20engine

~f1
<0
10
6

*2
<0
9
' 3

,

~~(~)
56j819101112 W

~(~24)
~OR
Refer
tolast page
(Foldout page).

HBR003
BR-46