1995 NISSAN ALMERA N15 Service Manual

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

Yes

Confirm
SELF-DIAGNOSTIC RESULTS"IMMU"displayed on
CONSULT screen.
Ref. part No: A.
Replace IMMU.

NATS
(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
DIAGNOSTIC PROCEDURE 1
Self-diagnostic results:
"IMMU" displayed onCONSULT screen

m

•SELF-DIAG RESULTS.
0

FAILURE DETECTED TIME
IMMU
0

I
ERASE

II
PRINT

I

SEL330U

Performinitialisation withCONSULT.
For theoperation ofinitialisation, referto"CONSULT operation
manual NATSV2.0".
*
Ref. partNo.:reference partNo.ofDiagnostic SystemDiagram onEL-255

m
•SELF-DIAG RESULTS.
0

FAILURE DETECTED TIME
ECM
0

I
ERASE

II
PRINT

I

SEL331U DIAGNOSTIC
PROCEDURE 2
Self-diagnostic results:
"ECM" displayed onCONSULT screen

Confirm SELF-DIAGNOSTIC RESULTS"ECM"displayed on
CONSULT screen.
Ref. part No.B.
Replace ECM.
Perform initialisation withCONSULT.
For theoperation ofinitialisation, referto"CONSULT operation
manual NATSV2.0".

•

EL-257

•SELF-DIAG RESULTS.
0

FAILURE DETECTED
CHAIN OFECM-IMMU TIME

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

DIAGNOSTIC PROCEDURE3

Self-diagnostic results:
"CHAIN OFECM-IMMU" displayedonCONSULT screen

m

ERASE
II
PRINT
I

SEL333U

IMMU
connector@

EEFf
I
fEill

SEL475U

IMMU
connector@

EEFf,11lE

SEL476U

IMMU
connector@

m

'--Ulsl
SEL477U

Ii
~i5 ~i5

II
ECM

El'CONNECTORII WilfEB

~~ IMMU

connector

Y/G
BRIY
[fiJ
@

~ fQj
SEL478U
00

Confirm
SELF-DIAGNOSTIC
RESULTS "CHAINOFECM-
IMMU" displayed onCONSULT
screen.
OK
Ii)
Check voltage between terminal
G)
of NG
Check thefollowing:
IMMU andground withCONSULTor
1----+

•7.5A fuse
tester. •
Harness continuity
Voltage: Batteryvoltage between
fuseand
OK IMMU
connector
@

If
NG, repair harness or
connector. Ref. part No.C1

~
Check voltage between terminal
@
of NG
Check thefollowing:
IMMU andground withCONSULTor
1----+

•7.5A fuse
tester. •Harness continuity
Voltage: Batteryvoltage betweenfuseand
OK IMMU
connector
@,

or between ignition
switch andfuse.
If NG, repair harness or
connectors. Ref. part No.C2

I!]
Check harness continuity between NG
Repair harness orcheck
IMMU terminal
CID
or
@
and ground.
r----.-

thebody ground screws
Continuity shouldexist. @,@and@!).
OK Ref.
part No.C3

Ii
Check harness continuity betweentheNG
Check thefollowing.
following ECMterminals andIMMU ter-
1----+

•Harness connectors
minals.
.

@,QD

ECM
@
and IMMU
@
•
Harness continuity
ECM
@
and IMMU
@
between
ECMand
Continuity shouldexist. IMMU.
OK If
NG, repair harness or
connectors.
Ref. part No.C4

EL-258

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

II
ECM
~CONNECTORII
~1=rEE

2526
11
IMMU

Y/G'
'BRIY ,, connector
@

~:: ::5JlM

I
I II
~ II II

~ L.l.................. _':"

SEL479U CHECK
COMMUNICATION LINECIR-
CUIT. 1) Disconnect ECMconnector and
IMMU connector.
2) Check voltage between thefollowing
terminals andground.
ECM
@.
ECM
@l,
IMMU @and
IMMU @
Voltage: OV

Ii
Ii
@

1
NG
---.. Communication
lineis
short-circuited withbat-
tery voltage lineorigni-
tion switch ONline.
Repair harness orcon-
nectors.
Ref. part No.C4
OK
Check continuity betweenthefollowing
terminals andground.
ECM
@,
ECM
@.
IMMU @and IMMU
@
Continuity shouldnotexist.

II

ECM
~
CONNECTOR
II~ 11133

2526
11
IMMU

Y/G'
'BRIY ,, connector
@

J0., "

~:: ::19JlO

~ II II

~ ~. .l.._............... ':"

SEL480U
III
OK Communication
lineis
short-circuited with
ground line.
Repair harness orcon-
nectors.
Ref. pari No.C4

III
R3LNATSantenna amp.

ITIID
connector
@ill)
CHECK
NATSANTENNA AMP.CIRCUIT.
1) Disconnect NATSantenna amp.con-
nector.
2) Turn ignition switch"ON".
3) Check voltage between antenna
amp. terminal
G)
and ground.
Voltage: Morethan4.7V NG
~ NATS
antenna amp.+5V
line isshort-circuited
with battery voltage line
or ground line.
Repair harness orcon-
nectors.
Ref. part No.E3
OK
SEL481U
SEL340U
•

Perform
initialisa-
tion with CON-
SULT. For theoperation
of initialisation,
refer to"CON-
SUL Toperation
manual NATS
V2.0".

II

(See nextpage.)
~ ECMismalfunctioning.
Replace ECM.
Ref. part No.B
screen.
OK
m
(See nextpage.)
SELF-FUNCTION
CHECK
1) Connect ECMconnector and
disconnect IMMUconnector.
2) Turn ignition switch"ON".
3) Touch "SELF-FUNCTION
CHECK" onCONSULT
"SELECT DIAGMODE"
Touch "START". ECMwillthen
check itscommunication inter-
face byitself.

o

@
START ij~
SEL341U
•
SELF-FUNCTION CHECK•
TOUCH START,
THEN ECMCHECK THE
IMMU COMMUNiCATION
INTERFACE BYITSELF.
~
SELECT DIAGMODE
C/U INITIALISATION
SELF-DIAG RESULTS
SELF-FUNCTION CHECK
01

I

III

====1

I
I

o

EL-259

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