2000 NISSAN PATROL engine

DIAGNOSTIC PROCEDURE 7
(NATS release signal check)
Does engine start properly?
Yes
cNo
Check NATS system.
CHECK NATS SIGNAL CIRCUIT.
1. Disconnect super lock control unit con-
nector and NATS IMMU connector.
2. Check continuity between super lock
control unit terminal
V34and NATS
IMMU terminal
V3.
Continuity should exist.
3. Check continuity between super lock
control unit terminal
V34and ground.
Continuity should not exist.
Refer to wiring diagram in EL-1128
(LHD), EL-1133 (RHD).
OK
cNG
Repair harness.
CHECK NATS RELEASE SIGNAL.
1. Connect super lock control unit con-
nector and NATS IMMU connector.
2. Check voltage between super lock con-
trol unit terminal
V34and ground.
OK
cNG
Check NATS system.
Replace super lock control unit.
Ignition switch conditionVoltage
[V]
OFF
5
More than 20 seconds after ignition
switch turned ON
For 20 seconds after ignition switch
turned ONPulse
SEL142X
SEL143X
.
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1147

System Description
NATS has the following immobilizer functions:
+Since only NATS ignition keys, whose ID nos. have been registered into the ECM and IMMU of NATS,
allow the engine to run, operation of a stolen vehicle without a NATS registered key is prevented by
NATS.
That is to say, NATS will immobilize the engine if someone tries to start it without the registered key of
NATS.
+This version of NATS has dongle unit to improve its anti-theft performance (RHD models). Dongle unit
has its own ID which is registered into NATS IMMU. So it dongle unit is replaced, initialization must be
carried out.
+When malfunction of dongle unit is detected:
Ð The security indicator lamp illuminates for about 15 minutes after ignition switch is turned to ON.
Ð When dongle unit has a malfunction and the indicator lamp is illuminated, engine can not be started.
However, engine can be started only one time when security indicator turns off in about 15 minutes
after ignition switch is turned to ON.
+Both of the originally supplied ignition key IDs have been NATS registered.
If requested by the vehicle owner, a maximum of five key IDs can be registered into the NATS compo-
nents.
+The NATS security indicator (NATS security ind.) blinks when the ignition switch is in ªOFFº or ªACCº
position. Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.
+When NATS detects trouble, the security indicator lamp lights up as follows.
Condition
IGN ON andWith Dongle Without Dongle
MIL Security Indicator MIL Security Indicator
NATS malfunction
(except dongle unit) is
detectedÐ1. 6 times blinking
2. Staying ON after igni-
tion switch is turned
ONÐ Staying ON
Only malfunction of
dongle unit is detected.ÐStaying ONfor about
15 minutesafter ignition
switch is turned ON.ÐÐ
Malfunction of NATS
and engine related parts
are detectedStaying ON1. 6 times blinking
2. Staying ON after igni-
tion switch is turned
ONStaying ON Staying ON
Only engine related part
malfunction is detectedStaying ON Ð Staying ON Ð
Just after initialization of
NATSÐ 6 times blinking Ð Ð
+NATS trouble diagnoses, system initialization and additional registration of other NATS ignition key IDs
must be carried out using CONSULT-II hardware and CONSULT-II NATS software.
Regarding the procedures of NATS initialization and NATS ignition key ID registration, refer to CON-
SULT-II operation manual, NATS.
+When servicing a malfunction of the NATS (indicated by lighting up of security Indicator Lamp)
or registering another NATS ignition key ID no., it is necessary to re-register original key identi-
fication. Therefore, be sure to receive ALL KEYS from vehicle owner.
NATS (Nissan Anti-Theft System)
EL-1164

System Composition
The immobilizer function of the NATS consists of the following:
+NATS ignition key
+NATS immobilizer control unit (NATS IMMU), located in the ignition key cylinder
+Engine control module (ECM)
+Dongle unit (RHD models)
+NATS security indicator
SEL148XA
NATS (Nissan Anti-Theft System)
EL-1165

CONSULT-II DIAGNOSTIC TEST MODE FUNCTION
CONSULT-II DIAGNOSTIC TEST
MODEDescription
C/U INITIALIZATION When replacing any of the following components, C/U initialization is necessary.
[NATS ignition key/IMMU/ECM/Dongle unit]
SELF-DIAG RESULTS Detected items (screen terms) are as shown in the chart below.
NOTE:
When any initialization is performed, all ID previously registered will be erased. So all NATS ignition
keys must be registered again.
The engine cannot be started with an unregistered key. In this case, the system may show ªDIFFER-
ENCE OF KEYº or ªLOCK MODEº as a self-diagnostic result on the CONSULT-II screen.
When initialization is performed (for RHD models), security indicator will flash six times to demon-
strate recognition of dongle unit ID.
HOW TO READ SELF-DIAGNOSTIC RESULTS
SEL151X
NATS (Nissan Anti-Theft System)
CONSULT-II (Cont'd)
EL-1170

SELF-DIAGNOSTIC RESULTS ITEM CHART
Detected items (Screen terms) Description Reference page
ECM INT CIRC-IMMUThe malfunction of ECM internal circuit of IMMU communication line is
detected.EL-1175
CHAIN OF ECM-IMMUCommunication impossible between ECM and IMMU.
(In rare case, ªCHAIN OF ECM-IMMUº might be stored during key regis-
tration procedure, even if the system is not malfunctioning.)EL-1176
DIFFERENCE OF KEYIMMU can receive the key ID signal but the result of ID verification
between key ID and IMMU is NG.EL-1178
CHAIN OF IMMU-KEYIMMU cannot receive the key ID signal. Otherwise, the registered ID sig-
nal from dongle unit cannot be received when the IMMU requests the
ID.EL-1179
ID DISCORD, IMM-ECMThe result of ID verification between IMMU and ECM is NG. System ini-
tialization is required.EL-1180
DON'T ERASE BEFORE CHECK-
ING ENG DIAGEngine trouble data and NATS trouble data have been detected in ECM. EL-1172
LOCK MODEWhen the starting operation is carried out 5 or more times consecutively
under the following conditions, NATS will shift the mode to one which
prevents the engine from being started.
+unregistered ignition key is used
+IMMU or ECM malfunctioningEL-1181
NATS (Nissan Anti-Theft System)
CONSULT-II (Cont'd)
EL-1171

Trouble Diagnoses
WORK FLOW
CHECK IN*NOTE: In rare case, ªCHAIN OF ECM-IMMUº might be stored as a self-
diagnostic result during key registration procedure, even if the sys-
tem is not malfunctioning.
Listen to customer complaints or request. (Get symptoms)
NOTE:
If customer reports a ªNo startº condition, request ALL
KEYS to be brought to the Dealer in case of a NATS mal-
function.
TROUBLEKEY SERVICE REQUEST (Additional key ID registration).Verify the security indicator.INITIALIZATION
(Refer to CONSULT-II operation
manual NATS.)
cUsing the CONSULT-II program card for NATS check the
ªSELF-DIAG RESULTSº with CONSULT-II.b
Self-diagnostic results referring to NATS, but no information
about engine self-diagnostic results is displayed on CONSULT-
II.Self-diagnostic results referring to NATS and ªDON'T ERASE
BEFORE CHECKING ENG DIAGº are displayed on CONSULT-
II.
(This means that engine trouble data has been detected in
ECM.)
Turn ignition switch ªOFFº.
Repair NATS.
(If necessary, carry out ªC/U INITIALIZATIONº with CONSULT-
II.*)Turn ignition switch ªOFFº.
Turn ignition switch ªONº.Repair NATS according to self-diagnostic results referring to
NATS.
(If necessary, carry out ªC/U INITIALIZATIONº with CONSULT-
II.*)
Erase the NATS ªSELF-DIAG RESULTSº by using CONSULT-II.
(Touch ªERASEº)Do not erase the NATS ªSELF-DIAG RESULTSº by using
CONSULT-II.
Start the engine.Check the engine ªSELF-DIAG RESULTSº with CONSULT-II by
using the CONSULT-II generic program card.
(Engine diagnostic software included)b
NGVerify no lighting up of the security indicator.
OKRepair engine control system (Refer to EC section.) when self-
diagnostic results except ªNATS MALFUNCTIONº are detected.
When only ªNATS MALFUNCTIONº is detected, erase the self-
diagnostic results and go to the next step.
CHECK OUTStart the engine. Does the engine start properly?
OKNG
Perform running test with CONSULT-II in engine ªSELF-DIAG
RESULTSº mode.Erase the NATS and engine ªSELF-DIAG RESULTSº by using
the CONSULT-II program card for NATS and generic program
card.
NGVerify ªNO DTCº displayed on the CONSULT-II screen.
OKStart the engine.
CHECK OUT
.
.
.
..
.
..
..
..
..
..
..
..
..
.
NATS (Nissan Anti-Theft System)
EL-1172

SYMPTOM MATRIX CHART 1
(Self-diagnosis related item)
SYMPTOMDisplayed ªSELF-DIAG
RESULTSº on CONSULT-II
screen.DIAGNOSTIC PROCE-
DURE
(Reference page)SYSTEM
(Malfunctioning
part or mode)REFERENCE PART NO.
OF ILLUSTRATION ON
DIAGNOSTIC SYSTEM
DIAGRAM
+Security indicator lighting
up*
+Engine does not startECM INT CIRC-IMMUPROCEDURE 1
(EL-1175)ECM B
CHAIN OF ECM-IMMUPROCEDURE 2
(EL-1176)In rare case, ªCHAIN OF
ECM-IMMU might be stored
during key registration
procedure, even if the sys-
tem is not malfunctioning.Ð
Open circuit in battery volt-
age line of IMMU circuitC1
Open circuit in ignition line
of IMMU circuitC2
Open circuit in ground line
of IMMU circuitC3
Open circuit in communica-
tion line between IMMU and
ECMC4
Short circuit between IMMU
and ECM communication
line and battery voltage lineC4
Short circuit between IMMU
and ECM communication
line and ground lineC4
ECM B
IMMU A
DIFFERENCE OF KEYPROCEDURE 3
(EL-1178)Unregistered key D
IMMU A
CHAIN OF IMMU-KEYPROCEDURE 4
(EL-1179)Malfunction of key ID chip E
IMMU A
Open circuit in ground line
of dongle unit circuitC6
Open or short circuit in
communication line between
IMMU and dongle unitC5
Dongle unit G
+Security indicator lighting
up*
+Engine hard to startID DISCORD, IMM-ECMPROCEDURE 5
(EL-1180)System initialization has not
yet been completed.F
ECM B
LOCK MODEPROCEDURE 6
(EL-1181)LOCK MODE D
+MIL staying ON
+Security indicator lighting
up*DON'T ERASE BEFORE
CHECKING ENG DIAGWORK FLOW
(EL-1172)Engine trouble data and
NATS trouble data have
been detected in ECMÐ
*: When NATS detects trouble, the security indicator lights up while ignition key is in the ªONº position.
*: When the vehicle is equipped with dongle unit, the security indicator blinks 6 times just after ignition switch is turned to ON. Then
the security indicator will light up while ignition key is in the ON position.
NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
EL-1173

DIAGNOSTIC PROCEDURE 3
Self-diagnostic results:
ªDIFFERENCE OF KEYº displayed on CONSULT-II screen
Confirm SELF-DIAGNOSTIC
RESULTS ªDIFFERENCE OF
KEYº displayed on CONSULT-II
screen.
OK
PERFORM INITIALIZATION.
Perform initialization with CONSULT-II.
Re-register all NATS ignition key IDs.
For the initialization procedure, refer to
ªCONSULT-II operation manual NATSº.
Initialization
completedInitialization
with CON-
SULT-II
incomplete or
failed
c
+IMMU is mal-
functioning.
1. Replace
IMMU.
Ref. part No.
A
2. Perform initial-
ization with
CONSULT-II.
For the initial-
ization
procedure,
refer to ªCON-
SULT-II opera-
tion manual
NATSº.
Start engine.
END.
(The ignition key was unregistered.)
Ref. part No. D
SEL163X
SEL566W
.
.
.
NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
EL-1178