1993 NISSAN SERENA Service Repair Manual

ANFLOCK
BRAKING SYSTEM
Operatlon (Cont'd)
i; !l
ii*
-ii
VEHICLE SPEED
. The appll€d bal@ @ndldon ls dp6ssEd by a slip €iio, s shown abova. ll lh€ slip
Etio i6
in th.
€ng€ lom 0.15 lo O.3, tha sh€.| hs ad€quarg coh€ nO p€rloma.@,
and d$ minimum siopplng
distan@ €n b€ achi€v€d.
. Th. srip 6rio lomula indi@r€s rhe @nrrcl ol wheel sp@d by rhe bEk6s.
The Aili-lock Sraklng Sysl€m (A-8.S.)
conlrcls b€k6lluid p@su€
usi.s th. 6lip ratios and lock-
Ing @ndlllon @lculaid ontain€d in rh. A.B-S. control unit.
. To adjusl whel sp€.d so lhrr fi6 oprinum 3lip htio
6 b. obiain.d, th. a,a.s, musi s6ns6 wh4l
3p4d sd v€hiolE sp.6d lhrcugh
a wh*l
.pe€d 5en6or.
ll lha bak
i6
appli€d, €speclally in lhe l@ked wh66l condirion, tE whicl6 sp@d
difi€c fom
th€
. All€r
lh6 wh€.| sp€6d chang€. l@n
th€ vohicle
sp*d due to ex@$lve brake for€, th6 A.B.S. dL
culat€s Ehicle.oe€d when lhe €du@d wh@l so4d @ch6s thB minimum.
VEHICLE
SPEED -
WHEEL SPEED
BB-€1

ANI}LOCK
BRAKING
SYSTEM
System Components
System Descriplion
SENSOF
Th6 sercof unil corcbb ol6 q€aFshgp.d
blor.nd a sensor
alamenl which
conlain6 a bar magnel
around which a coil is
wound. The sener is insialled on the back side ot lh6 b€k€
rotor. sin6'wav€ curent is g.neEted
by lhe sn.or a5 lhe
wh€€l rolale6.
Th. l@quency
and vollage inc€ase(s) as lhe
eialina speed inc€ases,
CONTBOL UNIT
Th. @ntrc! unit computes the oiating speed ol ihe wheet by
ihe siqnalcunentsenl fbn the *nsor, and supples a Dc cur
renl lo the a.iuaior solenoid valve provided
lor each lonr whe6l
and rear a e by cha.g ng its intemal resisla.€. ll also @ntrcl.
ON-OFF operaiion oi the valve rclay and pump
r6lay. ll any
6l6crric.lly d.reciable malluncrion
sholld odur in the system,
ihe contDl unir €uses the waning liqhr ro light up. In lhE
conditio., lhe A.B.S. wil be deaclival.d bv lh6 @ntrol
unt, and
the v6h cls s b€king sr€l€m r6v6ns
b noma
opeElion,
BR-32

AI{T|.LOCK
BRAKING SYSIEII
System De€crlplion (Coni'd)
ACTUATOR
o
@
@
@
o
o
o
o
J@
@
Th6 actuslor consisrs
or solenoid valves, a pump,
rcs.tron (brp€ssuB
decreasi.g), a.d adamperand
orilice (lo
pevent
hrgh pressu
6 llud pEouced
bv fe oLnp lron oeng appked to rh€ n4t€r
ct-
nd6r). rh6
$l€rod wlv. +.rqe6 it6
6poolpos'hon @respoad ns ro rr€ 6ntbtunt
oubut amperr-
q.: il lom6
a p€56!@
decreaslng circuit at abour 5 amp6e6.
a pfesure
holding onclir al aboul 2
amp€Fs, and a p@ssure
Increasing circuit 51 0 amp6res.
when ihe p€ssurc
d€crcas no cn@t is
tom€d, |he bdke fuld in the @liperflows inlo lh6 €sedoir
a.d lhe pG$!re
drops- Th6 plmp
d€l-
ve6 lhe iluid lo the dafrper and the odiica
to €du@ tluld
Dre$u@, belorc
irs r6tun ro
lhe m$ter
cv-
hnder. When rh€ p,€surc
holdirq crrcu
I 's
lortred,
fte catrper rin€
is cut of, .nd th€ ,u
d oe$Lre i"
lhe €liod is k€Dl
conslant.
BR-3il

AI.I]]-LOCK
BRAKING SYSTEM
S'yslern De6cription (Cont
d)
CONTBOL UNTI CONTFOL CHART
a
BR-34

AI,ITI.LOCK
BRAICNG SYSTEM
Circuit Dieg|?m
5
e
as
tt
@o Z, Z, at
E; E: ** 9-
6a
EE
;!
T ai
BR€5

ANTI-LOCK
BRAKING
SYSTEM
Wiring Diagram
Lh.D MODEL
r30
-a
ng;-
3:
@r'6q
sr'e:
*€E
@€)
F:
35
;!
PI :e
@
e
o
il
)-j:'-:q5
'''d6"'' @
+,,"91e €)
(A
la
€
*'g
{:
'"2
!-@r'i
@ 6
6)
rs
--E
at9
f 4". .E
6r
'i
I
I
E @@@
e+ ffiffil
l-
e
ffil
lffii ffi
t .oi Gl e
i$i I6JBE
u!:
"ng
.I
t!
8R.36

ATT.LOCK
BRAKING
SYSTEM
Wiring Dlag6m (Cont'd)
R.H.D. MODEL
@
er
@3? rs
@
@G
e @g
0@ 3€
g
E
0
3!@tt
€
t
E
BM
@@ (9
t"a
@
€ '-'
@,3
.-r ogE
€
"sl Gl
e
@r' {gtBs
e9
@ "_r
tgii
0
:g
a.
!6
s!
-!
8R.37

AI.I'I]-LOCK
BRAKING
SYSTEM
Removal and lnstallation
B. @r.lul rbt to d.mgE sd €dg€ sd $|Er Elor i.€lh.
FFONT WHEEL SENSOR
FEAF SENSOF
88.38