1995 NISSAN ALMERA N15 warning

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
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

TROUBLEDIAGNOSES
Contents
How toPerform TroubleDiagnoses forQuick andAccurate Repair SR-52
Self-diagnosis SR-53
CONSULT BR-58
CONSULT Inspection Procedure BR-59
Component PartsandHarness Connector Location BR-64
Preliminary Check BR-65
Ground CircuitCheck BR-66
Circuit Diagram forQuick Pinpoint Check BR-67
Diagnostic Procedure1Warning lampdoes notcome on BR-68
Diagnostic Procedure2Warning lampstays on BR-69
Diagnostic Procedure3ABS actuator solenoid valve BR-72
Diagnostic Procedure 4Wheel sensor orrotor BR-74
Diagnostic Procedure5Motor relayormotor BR-76
Diagnostic Procedure6Solenoid valverelay BR-79
Diagnostic Procedure7Power supply BR-81
Diagnostic Procedure 8Control unit BR-82
Diagnostic Procedure9Pedal vibration andnoise BR-82
Diagnostic Procedure10Long stopping distance BR-83
Diagnostic Procedure11Unexpected pedalaction BR-83
Diagnostic Procedure12ABS does notwork BR-84
Diagnostic Procedure13ABS works frequently BR-84
Electrical Component Inspection BR-85
How toPerform TroubleDiagnoses forQuick
and Accurate Repair
INTRODUCTION

The ABS system hasanelectronic controlunittocontrol major
functions. Thecontrol unitaccepts inputsignals fromsensors
and instantly drivestheactuators. Itis essential thatboth kinds
of signals areproper andstable. Itis also important tocheck
for conventional problems:suchasair leaks inbooster lines,
lack ofbrake fluid,orother problems withthebrake system.

SEF233G
Itis much moredifficult todiagnose aproblem thatoccurs
intermittently ratherthancontinuously. Mostintermittent prob-
lems arecaused bypoor electric connections orfaulty wiring.
In this case, careful checking ofsuspicious circuitsmayhelp
prevent thereplacement ofgood parts.
A visual checkonlymaynotfind thecause ofthe problems, so
a road testshould beperformed.
Before undertaking actualchecks, takejustafew minutes to
talk with acustomer whoapproaches withaABS complaint. The
customer isavery good source ofinformation onsuch prob-
lems; especially intermittent ones.Through thetalks withthe
customer, findoutwhat symptoms arepresent andunder what

SEF234G
conditions theyoccur.
Start yourdiagnosis bylooking for"conventional" problems
first. Thisisone ofthe best ways totroubleshoot brakeprob-
lems onanABS controlled vehicle.

BR-52

.=J
MPH

-~s::~

~~

___ --- warnin:1
TROUBLE
DIAGNOSES
Self-diagnosis (ForEurope)
FUNCTION

• When aproblem occursinthe ABS, thewarning lamponthe
instrument panelcomes on.
• Amaximum ofthree malfunctions arestored inthe memory
of the ABS control unit.

Erase theself-diagnosis resultsstoredinthe control unitafter
malfunctions arerepaired (Seenextpage).

• The self-diagnosis resultsareidentified byCONSULT or
warning lamp.

SELF-DIAGNOSIS PROCEDURE

Start engine.
Dr.ive vehicle over15km/h (9MPH) foratleast oneminute .
Stop vehicle withengine running.

Make surethaitheASS warning lampactivates.

SBR875CA
Verifythelocation ofthe malfunction withthemalfunction codechart.
Then make necessary repairsfollowing thediagnostic procedures.
After themalfunctions arerepaired, erasetheself-diagnostic results
stored inthe control unit.

Disconnect connectors forASS control unitorthe battery negative termi-
nal foratleast oneminute.

Check warning lampfordeactivation afterdriving vehicle over15km/h (9
MPH) foratleast oneminute.
Test theASS inasafe area toverify thatitfunctions properly.

BR-53
•

TROUBLEDIAGNOSES
Self-diagnosis (ForEurope) (ConI'd)
HOW TOREAD SELF-DIAGNOSTIC RESULTS(Malfunction codes)

• Determine thecode No.bycounting thenumber oftimes thewarning lampflashes onand off.
• The malfunction codechart isgiven onthe next page.

Example

Warning lampON
Warning lampOFF Malfunction
codeNo.12and 23

c
a
3seconds (Clearance betweencodeNo.)
b 0.6second (Tendigits)
c 0.3second (Onedigit)

SBR877CA
HOW TOERASE SELF-DIAGNOSTIC RESULTS(Malfunction codes)

• Disconnect ASScontrol unitconnectors orbattery negative terminalforatleast oneminute.
• When usingCONSULT, touch"ERASE" onthe CONSULT screenwithself-diagnostic resultsmode.

BR-54

TROUBLEDIAGNOSES
Self-diagnosis (ForEurope) (Cont'd)
MALFUNCTION CODE/SYMPTOM CHART

Code No.
Malfunctioningpart Diagnostic
procedure
(No. ofwarning lampflashes)

45
Actuator
frontleftoutlet solenoid valve

3
46
Actuator
frontleftinlet solenoid valve
3
41
Actuator
frontrightoutlet solenoid valve
3
42
Actuator
frontrightinletsolenoid valve

3
51
Actuator
rearright outlet solenoid valve
3
52
Actuatorrearright inletsolenoid valve
3
55
Actuator
rearleftoutlet solenoid valve
3

56
Actuator
rearleftinlet solenoid valve
3
25
Frontleftsensor (open-circuit)
4
26
Front
leftsensor (short-circuit)
4
21
Frontrightsensor (open-circuit)
4
22
Front
rightsensor (short-circuit)

4
35
Rearleftsensor (open-circuit)
4
36
Rear
leftsensor (short-circuit)

4
31
Rearrightsensor (open-circuit)

4
32
Rearrightsensor (short-circuit)

4
18
Sensorrotor

4
61
Actuatormotorormotor relay

5
63
Solenoidvalverelay

6

57
Powersupply (Lowvoltage)

7
71
Controlunit

8

Control unitpower supply circuit
Warning lampstays onwhen igni-Warning
lampbulbcircuit
tion switch isturned on Control
unitorcontrol unitconnector

2

Solenoid valverelaystuck
Power supply forsolenoid valverelaycoil
Warning lampstays on,during
Controlunit

-

self-diagnosis
Warning lampdoesnotcome onFuse, warning lampbulborwarning lampcircuit

1

when ignition switchisturned onControl unit
Warning lampdoes notcome on
Control unit
during self-diagnosis
-

Pedal vibration andnoise

-
9

Long stopping distance

-
10

Unexpected pedalaction

-
11

ABS does notwork

-

12

ABS works frequently

-
13

BR-55
•

TROUBLEDIAGNOSES
Self-diagnosis (ExceptEurope)
FUNCTION

• When aproblem occursinthe ASS, thewarning lamponthe
instrument panelcomes on.Tostart theself-diagnostic
results mode,ground theself-diagnostic (check)terminal
located on"Data LinkConnector forCONSULT". Theloca-
tion ofthe malfunction isindicated bythe warning lamp
flashing.

SELF-DIAGNOSIS PROCEDURE

[i
s~'~" \

~/''':~~

~/\\l---u~

DATA LINKCONNECTOR (D'.ctthe harness)

for
CONSULT
~Isconne

~ / !
/717) ')
SBR054D
Drive
vehicle over30km/h (20MPH)
for atleast oneminute.

~

Turn ignition switch"OFF".

m
L

Ground terminal "L"of"DATA LINK
CONNECTOR forCONSULT" witha
suitable harness.

L

Turn ignition switch"ON"while
grounding terminal"L".

Do not depress brakepedal.

m
~

After 3.6seconds, thewarning lamp
starts flashing toindicate themalfunc-
tion code No(See NOTE.)

~

Verify thelocation ofthe malfunction
with themalfunction codechart. Refer
to BR-57. Thenmake thenecessary
repairs following thediagnostic proce-
dures.

L

After themalfunctions arerepaired,
erase themalfunction codesstored in
the control unit.Refer toBR-57.

~

Rerun theself-diagnostic resultsmode
to verify thatthemalfunction codes
have been erased.

~
1

Disconnect thecheck terminal from
the ground. Theself-diagnostic results
mode isnow complete.
,
NOTE:
Theindication terminates
after fiveminutes.
However, whentheignition
switch isturned from

"OFF"
to
"ON",
theindica-
tion starts flashing again.
BR-56

TROUBLEDIAGNOSES
Self-diagnosis (ExceptEurope) (Cont'd)

@

Check warning lampfordeactivation
after driving vehicle over30km/h (20
MPH) foratleast oneminute.
After making certainthatwarning
lamp does notcome on,test theASS
in asafe area toverify thatitfunctions
properly.

•

SBR441C
CODE
NO.32

Tens digits Unitsdigits
Unit: Second

3.6

HOW TOERASE SELF-DIAGNOSTIC RESULTS
(Malfunction codes)

1. Disconnect thecheck terminal fromground (ASSwarning
lamp willstay lit).
2. Within 12.5seconds, groundthecheck terminal 3times.
Each terminal groundmustlastmore than1second. The
ASS warning lampgoesoutafter theerase operation has
been completed.
3. Perform self-diagnosis again.RefertoSR-56. Onlythestart
code should appear, nomalfunction codes.

0.4
1.60.40.4 0.4

3.6
ON
OFF
OFF
Self-diagnosiscompleted

"I

~~ i

::J1IU 1
L

p;eck~IJi
i

Open -._.-

Idlsconnect)
!

Ground
10---+1
I

__ .__ ... _--.J..
~9rt'_
!~~_1.~:':. ......L
J

; 12.5
see
j

Malfunction code
memory erased

ABR256
IGN

Warning

lamp ON
HOW
TOREAD SELF-DIAGNOSTIC RESULTS(Malfunction codes)

• Determine thecode No.bycounting thenumber oftimes thewarning lampflashes onand off.
• When several malfunctions occuratone time, uptothree codenumbers canbestored; thelatest
malfunction willbeindicated first.
• The indication beginswiththestart code 12.After thatamaximum ofthree codenumbers appearin
the order ofthe latest onefirst. Theindication thenreturns tothe start code 12torepeat (theindi-
cation willstay onfor five minutes atthe most).
• The malfunction codechart isgiven onthe next page.

Example: CodeNo.32REAR SENSOR SHORT-CIRCUIT

Start code: 12
Tens digits Unitsdigits

MALFUNCTION CODE/SYMPTOM CHART

Refer toSR-55.

BR-57