engine NISSAN ALMERA N15 1995 Owners Manual

NATS(Nissan Anti-Theft System)
System Description

NATS V2.0forNissan modelN15hasthefollowing immobiliser functions:
• Since onlyNATS ignition keys,whose IDnos. have been registered intotheECM andIMMU ofNATS,
allow theengine torun, operation ofastolen vehicle withoutaNATS registered keyisprevented by
NATS.
That isto say, NATS V2.0willimmobilize theengine ifsomeone triestostart itwithout theregis-
tered keyofNATS V2.0.
• Both ofthe originally suppliedignitionkeyIDshave been NATS registered.
If requested bythe vehicle owner,amaximum offour keyIDscan beregistered intotheNATS com-
ponents.
• The NATS security indicator (NATSsecurity ind.)blinks whentheignition switchisin "OFF" or
"ACC" position. Therefore, NATSwarns outsiders thatthevehicle isequipped withtheanti-theft
system.
• When NATSdetects trouble, themalfunction indicatorlamp(MIL) blinks.
• NATS trouble diagnoses, systeminitialisation andadditional registration ofother NATS ignition key
IDs must becarried outusing CONSULT hardwareandCONSULT NATSsoftware.
When NATS initialisation hasbeen completed, theIDofthe inserted ignitionkeyisautomatically
NATS registered. Then,ifnecessary, additionalregistration ofother NATS ignition keyIDscan be
carried out.
Regarding theprocedures ofNATS initialisation andNATS ignition keyIDregistration, refertoCON-
SUL Toperation manual,NATSV2.0.
• When diagnosing NATSV2.0using CONSULT, adapterandadapter harness forNATS V1.0arenot
necessary, althoughadirect DDLcable connection betweenCONSULT andDOL connector is
required.
• When servicing amalfunction ofthe NATS V2.0(indicated byflashing ofMalfunction IndicatorLamp)
or registering anotherNATSignition keyIDno., itmay benecessary tore-register originalkeyiden-
tification. Therefore, besure toreceive allkeys from vehicle owner.

System Composition

The immobiliser functionofthe NATS forNissan modelN15consists ofthe following:
• NATS ignition key
• NATS antenna amp.located inthe ignition keycylinder
• NATS immobiliser controlunit(NATS IMMU)
• Engine control module (ECM)
• NATS security indicator locatedunderthecenter cluster (NATSsecurity ind.)
• Malfunction indicatorlamp(MIL)

NATS ignition key

(
((
(

El-247
SEL304U

•

NATS(Nissan Anti-Theft System)
Trouble Diagnoses
WORK FLOW

I
CHECK
IN

Listen tocustomer complaints orrequest. (Getsymptoms) 'MIL:
Malfunction IndicatorLamp
KEY SERVICE REQUEST (Additional keyIDregistration)
TROUBLE

I
Verify theblinking ofMIL'.
(RefertoCONSULT operation
manual NATSV2.0.)
Using theCONSULT programcardforNATS check the
"SELF-DiAG RESULTS"withCONSULT.
Self-diagnostic resultsreferring toNATS, butnoinformation
about engine self-diagnostic resultsisdisplayed onCON-
SULT.

I
Turn ignition switch"OFF".

t

Repair NATS.
(If necessary, carryout"SELF-FUNCTION CHECK"or
"C/U

INITIALISATION" withCONSULT.) Self-diagnostic
resultsreferring toNATS and"DON'T
ERASE BEFORE CHECKING ENGDIAG" aredisplayed on
CONSULT.
(This means thatengine trouble datahasbeen detected in
ECM.)
Turn ignition switch"OFF".

I
Turn ignition switch"ON".

I
Repair
NATS.
(If necessary, carryout"SELF-FUNCTION CHECK"or
"C/U

INITIALISATION" withCONSULT.)
Erase theNATS "SELF-DIAG RESULTS"byusing CON-
SUL T.(Touch "ERASE")

I
Start theengine.
NG Verify noblinking ofMIL'.

OK

I
CHECK OUT

-

Perform runningtestwith CONSULT inengine SELF-DiAG
RESULTS" mode.
NG Verify "NOFAILURE" displayedonthe CONSULT screen.

OK

I
CHECK OUT
Don't
erase theNATS "SELF.DlAG RESULTS"byusing
CONSULT.

I
Start theengine.
Verify noblinking ofMIL'.

OK

I
Turn ignition switch"OFF".

~

Check theengine "SELF-DiAG RESULTS"withCONSULT by
using theCONSULT genericprogram card.
(Engine diagnostic softwareincluded)
Repair ECCS.(RefertoEC section.)

I
Turn ignition switch"ON".
Erase theengine "SELF-DIAG RESULTS"byusing CON-
SUL T.(Touch "ERASE".)

I
Start theengine.
NG

•

EL-251

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
HOW TOREAD SELF-DIAGNOSTIC RESULTS

Resultdisplay screen(Whenmalfunction isdetected)

When touched, the
--l;
ERASE "PRINT
sell-diagnostic results
stored inthe engine
control module (ECM)
are erased. Page
mark

Time data'
This indicates howmany
times thevehicle was
driven afterthelast
detection ofamalfunction
If the malfunction isbeing
detected currently. the
time datawillbe"0".
;J-
When touched, the
self-diagnostic results
are printed out.
DIFFERENCE
OFKEY
•
SELF-DIAG RESULTS.
FAILURE DETECTED
IMMU

Detected
items

FURTHER TESTING
MAY BEREQUIRED.
**

ERASE "PRINT

Result
display screen(Whennomalfunction isdetected)

• SELF-DIAG RESULTS. D
FAILURE DETECTED TIME
*NO SELF DIAGNOSTIC
FAILURE INDICATED.
SEL332UD
*
Iftrip number ismore than1,MIL does notblink .

•

EL-253

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
CONSULT DIAGNOSTIC TESTMODE FUNCTION

CONSULT DIAGNOSTIC TEST
MODE

C/U
INITIALIZATION
SELF-FUNCTION CHECK
SELF-DIAGNOSTIC RESULTS Description
When replacing anyofthe following threecomponents,
C/U
initialization isnecessary.
[NATS ignition key/lMMU/ECMj
ECM checks itsown NATS communication interfacebyitself.
Detected items(screen terms)areasshown inthe chart below.

SELF-DIAGNOSTIC RESULTSITEMCHART

Detected items(Screen terms) Description Reference
page
IMMU ECMreceived thesignal fromIMMU thatIMMU ismalfunctioning. EL-257
ECM ECMismalfunctioning. EL-257
CHAIN OFECM-IMMU CommunicationimpossiblebetweenECMandIMMU. EL-258
DIFFERENCE OFKEY IMMU
canreceive thekey
10
signal butthe result ofID verification
EL-260
between keyIDand IMMU isNG.
CHAIN OFIMMU-KEY
IMMUcannot receive thekey IDsignal. EL-261
ID DISCORD, IMM-ECM The
result of
10
verification betweenIMMUandECM isNG. System
EL-263
initialisation isrequired.
MINGLE NOISE Noise
(interference) mingledintoNATS communication linesduring
EL-264
communicating.
DON'T ERASE BEFORE CHECK-
Enginetrouble dataandNATS trouble datahave beendetected in
EL-264
ING ENG DIAG ECM.

EL-254

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
SYMPTOM MATRIXCHART1
(Self-diagnosis relateditem)

X:Possibility item.'MIL: Malfunction IndicatorLamp
SYMPTOM
SYSTEM REFERENCEPART
Displayed"SELF-
DIAGNOSTIC PROCE-
(Malfunctioning NO.OFILLUSTRA-
•Blinking ofMIL'. •
Blinking ofMIL'.
DIAGRESULTS" on
DURE
part ormode) TIONONNEXT PAGE
•Engine willstart. •
Hard tostart
CONSULTscreen.
(Referencepage)
engine.
IMMU A
X IMMUPROCEDURE
1
(EL-257)
ECM BX
ECMPROCEDURE
2
(EL-257)
Open circuit inbat-
tery voltage lineof C1
X
IMMU circuit
Open circuit inigni-
.

tion lineofIMMU cir- C2
X
cuit
Open circuit in
ground lineofIMMU
C3 X
circuit
Open circuit incom-
munication line
C4
X

between IMMUand
ECM CHAINOFECM-
PROCEDURE3
Short circuit between IMMU
(EL-258)
IMMU andECM com-
C4
X

munication lineand
battery voltage line
Short circuit between
IMMU andECM com-
C4 X
munication lineand
ground line
Open circuit inpower
source lineofANTI E3

X

AMP circuit
ECM B X
IMMU A
X

Unregistered key 0 X
PROCEDURE4
DIFFERENCE OFKEY
IMMU A

X
(EL-260)
Communication line
between ANT
I
AMP
E1
X

and IMMU:
Open circuit orshort
circuit ofbattery volt-
age lineorshort cir- E2

X

cuit ofground line
Open circuit inpower
source lineofANTI E3
X
PROCEDURE5
AMP circuit CHAIN
OFIMMU-KEY
(EL-261)
Open circuit in
ground lineofANTI E4

X

AMP circuit
Malfunction ofkey 10
E5 X
chip
IMMU A
X

Antenna amp. E6
X

EL-255
•

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)

SYMPTOM
SYSTEM REFERENCEPART Displayed"SELF- DIAGNOSTIC
PROCE-
(Malfunctioning NO.OFILLUSTRA-
•Blinking ofMIL*. •
Blinking ofMIL *.
DIAGRESULTS" on DURE
part ormode)
TIONONNEXT PAGE
•Engine willstart. •
Hard tostart
CONSULTscreen. (Reference
page)
engine.
System initialisation
has notyetbeen
F X

10
DISCORD, IMM- PROCEDURE 6
completed. ECM(EL-263)
ECM F X
Noise interference in
XMINGLE
NOISE PROCEDURE
7
communication line (EL-264)
Engine trouble data
DON'TERASE
and NATS trouble
BEFORECHECKING WORK
FLOW
data have been X
X
(EL-251)
detected inECM ENG
DIAG

SYMPTOM MATRIXCHART2
(Non self-diagnosis relateditem)

X:Possibility item
SYSTEM SYMPTOM
DIAGNOSTIC
PROCE-
(Malfunctioning partormode) DURE
NATS security indodoes notlight up.
(Referencepage)
NATS security indo
Open circuit between FuseandNATS IMMU
PROCEDURE8
X (EL-264)
Continuation ofinitialisation mode
NATS IMMU

DIAGNOSTIC SYSTEMDIAGRAM

NATS antenna amp.
PART
0 Key10chip (PART E5)

i-------
L---
--j)))

:
.

, ,

I~ .'

(((

NATS ignition

key
PART
E1,E2,E3, E4 IGN
PART C2~ +1./PART C1(MIL)
PART C4
ECM

..
........

................
:'

.......

PART F

D
IGN

EL-256
CONSULT

SEL466U

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
• SELF-FUNCTION CHECK•
ECM's IMMU
COMMUNICATION INTERFACE

II
***
***
11[!1
******

___ P_R_IN_T
I

SEL342U
• SELF-FUNCTION CHECK•
ECM's IMMU
COMMUNICATION INTERFACE

******
OK
******

___ P_RI_N_T '

SEL343U IMMU
ismalfunctioning.
Replace IMMU.
Ref. part No.A

00
Perform
initialisation withCON-
SULT.
For theoperation of
initialisation, referto"CONSULT
operation manualNATSV2.0".

m
•SELF-DIAG RESULTS.
0

FAILURE DETECTED TIME
DIFFERENCE OFKEY
0

I
ERASE

"
PRINT

I

SEL344U

ERASE
II
PRINT
I

SEL372U

•

C/U
INITIALISATION
INITIALISATION
STOPPED orFAILED
TURN IGNKEY SW"OFF"
AND "ON" AFTER CON-
FIRMING SELF-DIAG
RESULTS, PERFORM C/U
INITIALISATION AGAIN.
•
DIAGNOSTIC
PROCEDURE 4
Self-diagnostic results:
"DIFFERENCE OFKEY" displayed onCONSULT screen

m

00
Confirm
SELF-DIAGNOSTIC
RESULTS "DIFFERENCE OF
KEY" displayed onCONSULT
screen.

t
K
Initialisation

I!J

incompleted •

00
Perform
initialisation withCON- or
failed
IMMUismal-
SULT . with
CON-
functioning.
Re-register allNATS ignition keySULT
ReplaceIMMU.
IDs. Ref.
part No.A
For theoperation ofinitialisation,
refer to"CONSULT operation
manual NATSV2.0".
l,nitialisation completed
Start engine.

~

END
00
Perform
initial isa-
(Ignition keyIDwas unregistered.) tion
with CON-
Ref. part No.0 SULT.
For theoperation
of initialisation,
refer to"CON-
SUL Toperation
manual NATS
V2.0"
EL-260

Ii
1

CHECK ANTENNA AMP.GROUND LINENG

~
NATS
antenna amp.
CIRCUIT. groundlineisopen cir-
1) Turn ignition switch"OFF". cuit.
2) Check continuity betweenNATS Checkharness continuity
antenna amp.terminal
@
and betweenIMMUterminal
ground.
(J)

and NATS antenna

Continuity shouldexist.
amp.
terminal
@.

If NG, repair harness or
OK connectors.

Ref. part No.E4

CHECK NATSIGNITION KEY
10
CHIP. Start
Ignition key
10
chip was
1) Connect NATSantenna amp.con-
~

malfunction
i
ng.
nector. Replacetheignition key.
2) Pull theignition keyout.
Ref.
part No.E5

3) Start engine withanother registered
NATS ignition key.
Start NG

[!1
NG

00
Perform
initialisa-
CHECK IMMUOUTPUT VOLTAGE.
-

1) Turn theignition switch"ON". tion
with CON-
2) Check voltage between IMMUtermi- SULT.
nal
@
and ground. Fortheoperation

Voltage: Morethan4.7V
of
initialisation,
refer to"CON-
OK SUL
Toperation
manual NATS
V2.0".

t

Replace IMMU.

'-+
Ref.part No.A

1:1
CHECK IMMUGROUND CIRCUIT. NG
Replace IMMU.

~

1) Turn theignition switch"OFF".
Ref.part No.A

2) Disconnect IMMUconnector.
3) Check continuity betweenIMMUter-
minal
(J)
and ground.

Continuity shouldexist.

OK

0

CHECK IMMUFUNCTION 1.

00
Perform
initialisa-
1) Connect IMMUconnector andNATS tion
with CON-
antenna amp.connector. SULT.
2) Check voltage between IMMUtermi- For
theoperation
nal
@
and ground. of
initialisation,
refer to"CON-

Voltage
SUL
Toperation
manual NATS
Time (After turning igni-
VoltageIV] V2.0".
tion switch "ON".)
For approx. 0.5sec. Approx.
2.3-5
After 1sec. 0
NG
Replace IMMU.

~
Ref.part No.A

1
0K

SEL486U
SEL488U
SEL487U
NATS
(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
@

~i5

IMMU

connector@

~i5

IMMU

connector@

ffitflfEB

NATS
antenna amp.
connector
@ID

~i5

IMMU

connector@

rtfa;EB

Ii

o
SEL489UEL-262

SEL490U
IMMU
connector@
NATS
(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)

CID

II
1

CHECK IMMUFUNCTION 2. NG
Replace IMMU.
1) Disconnect NATSantenna amp.con-
r---+

Ref.part No.A
nector.

1

2)
Turn ignition switch"ON".
3) Check voltage between IMMUtermi-
nal
@
and ground.

00
Perform
initialisa-
Voltage: tion
with CON-
6 sec. after turning ignition switch SULT.
"ON" Fortheoperation
Approx. 4.5-5V of
initialisation,
refer to"CON-
OK SULToperation
manual NATS
V2.0".
NATS antenna amp.ismalfunctioning.
When replacing theamp. holdonto
amp. body. Takecarenottopull on
amp. harness.
Ref. part No.E6
DIAGNOSTIC PROCEDURE6
*"10 DISCORD, IMM-ECM":
Registered IDofIMMU is
in discord withthatof
ECM.
Confirm
SELF-DIAGNOSTIC
RESULTS "10DISCORD, IMM-
ECM*" displayed onCONSULT
screen.

Self-diagnostic
results:
"ID DISCORD, IMM-ECM" displayedonCONSULT screen

m

00

•
SELF-DIAG RESULTS.
0

FAILURE DETECTED TIME
ID DISCORD,IMM-ECM 0
ERASE
II
PRINT

I

SEL383U

[;]
•
C/U
INITIALISATION

•

INITIALISATION
STOPPED orFAILED
TURN IGNKEY SW"OFF"
AND "ON", AFTER CON-
FIRMING SELF-DIAG
RESULTS, PERFORM C/U
INITIALISATION AGAIN.
ERASE
II
PRINT

I

SEL372U Perform
initialisation withCON-
SULT .
Re-register allNATS ignition key
IDs.
For theoperation ofinitialisation,
refer to"CONSULT operation
manual NATSV2.0".
Initialisation
completed
Start engine.
END
Ref. part No.F Initialisation
[;]
incompleted -
or failed ECMismalfunc-
with CON- tioning.
SUL T ReplaceECM.
Ref. part No.F
Perform initialisa-
tion with CON-
SULT.
For theoperation
of initialisation,
refer to"CON-
SUL Toperation
manual NATS

V2.0".
•

EL-263

Self-diagnosticresults:
"MINGLE NOISE"displayed onCONSULT screen

m
T
Confirm SELF-DIAGNOSTIC RESULTS"MINGLENOISE"dis-
~ played onCONSULT screen.

NATS
(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
DIAGNOSTIC PROCEDURE 7

• SELF.DIAG RESULTS.
0

FAILURE DETECTED TIME
MINGLE NOISE 0

ERASE
II
PRINT
I
Turnofforremove anypossible noisesources.

SEL384U

• SELF.DIAG RESULTS.
0

FAILURE DETECTED TIME
MINGLE NOISE 0 Touch
"ERASE" onCONSULT SELF-DIAGNOSTIC RESULTS
screen.

ER~I PRINT
I

SEL385U
Start
engine.

OK

END
NG
DIAGNOSTIC PROCEDURE8
"NATS SECURITY IND.DOES NOTLIGHT UP"

m

o
UP

SIDE I~

....

EE3J

7.5A

SEL491U
Check
fuse(7.5A) inthe fuse box.

OK

NATS INITIALISATION
1) Fix the 7.5A fuseshown left

m.

2) Perform initialisation with
CONSULT.
For theoperation of
initialisation, referto"CON-
SUL Toperation manualNATS
V2.0".
NG

Replace fuse.
Turn ignition switch"OFF".
Start engine andturn ignition switch

"OFF".

Check NATSsecurity indoblinking.
OK

END

NG
EL-264