1998 NISSAN PATROL IGN eC

DIAGNOSTIC PROCEDURE 8
Self-diagnostic results:
``LOCK MODE'' displayed on CONSULT screen
Con®rm SELF-DIAGNOSTIC
RESULTS ``LOCK MODE'' is dis-
played on CONSULT screen.
1. Turn the ignition switch to OFF posi-
tion.
2. Turn the ignition key switch to ON posi-
tion with a registered key.
(Do not start engine.) Wait for 5 sec-
onds.
3. Return the key to the OFF position.
4. Repeat steps 2 and 3 twice (total of
three cycles).
5. Start the engine.
Can the engine start?
No
cYe s
System is OK.
(Now the system is
escaped from ``LOCK
MODE''.)
CHECK NATS IMMU INSTALLATION.
Refer to ``How to Replace NATS IMMU'' in
EL-253.
OK
cNG
Reinstall NATS IMMU cor-
rectly.
PERFORM INITIALISATION.
Perform initialisation with CONSULT.
For the initialisation procedure, refer to
``CONSULT operation manual NATS V2.0
(GASOLINE)''.
Can the system be initialized?
Note: If the initialisation is incompleted or
failed, CONSULT shows
mes-
sage on the screen.
No
cYe s
System is OK.
Go to DIAGNOSTIC PROCEDURE 5,
EL-250 to check ``CHAIN OF IMMU-KEY''.
SEL790U
SEL038V
.
.
.
.
NATS (Nissan Anti-Theft System)/LHD MODELS
Trouble Diagnoses (Cont'd)
EL-252

System Description
NATS has the following immobiliser 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.
+Both of the originally supplied ignition key IDs have been NATS registered.
If requested by the vehicle owner, a maximum of four key IDs can be registered into the NATS compo-
nents.
+The NATS security indicator (NATS security ind.) blinks when the ignition switch is in ``OFF'' or ``ACC''
position. Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.
+When NATS detects trouble, the malfunction indicator lamp (MIL) blinks.
+NATS trouble diagnoses, system initialisation and additional registration of other NATS ignition key IDs
must be carried out using CONSULT hardware and CONSULT NATS software.
When NATS initialisation has been completed, the ID of the inserted ignition key is automatically NATS
registered. Then, if necessary, additional registration of other NATS ignition key IDs can be carried out.
Regarding the procedures of NATS initialisation and NATS ignition key ID registration, refer to CONSULT
operation manual, NATS.
+When servicing a malfunction of the NATS (indicated by ¯ashing of Malfunction Indicator Lamp)
or registering another NATS ignition key ID no., it may be necessary to re-register original key
identi®cation. Therefore, be sure to receive all keys from vehicle owner.
System Composition
The immobiliser function of the NATS consists of the following:
+NATS ignition key
+NATS antenna amp. located in the ignition key cylinder
+NATS immobiliser control unit (NATS IMMU)
+Engine control module (ECM)
+NATS security indicator
+Malfunction indicator lamp (MIL)
SEL304U
NATS (Nissan Anti-Theft System)/RHD MODELS
EL-255

CONSULT
CONSULT INSPECTION PROCEDURE
1. Turn off ignition switch.
2. Connect ``CONSULT'' to Data link connector for CONSULT.
(Data link connector for CONSULT is located behind the fuse
box cover.)
3. Insert NATS program card into CONSULT.
: Program card
NATS-E940
4. Turn on ignition switch.
5. Touch ``START''.
6. Touch ``V.2.0 (GASOLINE)''.
NOTE: ``V2.0 (GASOLINE)'' should be selected for electrically
controlled diesel and gasoline engines.
7. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT Operation Manual,
NATS V2.0 (GASOLINE).
SEF532V
SEL327U
SEL328U
SEL329U
NATS (Nissan Anti-Theft System)/RHD MODELS
EL-257

CONSULT DIAGNOSTIC TEST MODE FUNCTION
CONSULT DIAGNOSTIC TEST
MODEDescription
C/U INITIALIZATION When replacing any of the following three components, C/U initialization is necessary.
[NATS ignition key/IMMU/ECM]
SELF-FUNCTION CHECK ECM checks its own NATS communication interface by itself.
SELF-DIAGNOSTIC RESULTS Detected items (screen terms) are as shown in the chart below.
NOTE:
When any initialisation 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 ``DIFFER-
ENCE OF KEY'' or ``LOCK MODE'' as a self-diagnostic result on the CONSULT screen.
HOW TO READ SELF-DIAGNOSTIC RESULTS
* If trip number is more than 1, MIL does not blink.
SELF-DIAGNOSTIC RESULTS ITEM CHART
Detected items (Screen terms) Description Reference page
IMMU ECM received the signal from IMMU that IMMU is malfunctioning. EL-261
ECM ECM is malfunctioning. EL-261
CHAIN OF ECM-IMMU Communication impossible between ECM and IMMU. EL-262
DIFFERENCE OF KEYIMMU can receive the key ID signal but the result of ID veri®cation
between key ID and IMMU is NG.EL-264
CHAIN OF IMMU-KEY IMMU cannot receive the key ID signal. EL-265
ID DISCORD, IMM-ECMThe result of ID veri®cation between IMMU and ECM is NG. System ini-
tialisation is required.EL-266
MINGLE NOISENoise (interference) mingled into NATS communication lines during com-
municating.EL-267
DON'T ERASE BEFORE CHECK-
ING ENG DIAGEngine trouble data and NATS trouble data have been detected in ECM. EL-259
LOCK MODEWhen an unregistered ignition key is used, or if the starting operation is
carried out two or more times consecutively with the ignition key, IMMU
or ECM malfunctioning, NATS will shift the mode to one which prevents
the engine from being started.EL-268
SEL332UC
NATS (Nissan Anti-Theft System)/RHD MODELS
CONSULT (Cont'd)
EL-258

Trouble Diagnoses
WORK FLOW
CHECK IN*Lighting-up mode of MIL (Malfunction Indicator Lamp)
For single malfunction of NATS: Blinking
For dual malfunctions of NATS and an engine-related part:
Stays ON
For single malfunction of an engine-related part: Stays ON
Listen to customer complaints or request. (Get symptoms)
TROUBLEKEY SERVICE REQUEST (Additional key ID registration).Verify the MIL*.INITIALISATION
(Refer to CONSULT operation
manual NATS V2.0.)
cUsing the CONSULT program card for NATS check the ``SELF-
DIAG RESULTS'' with CONSULT.b
Self-diagnostic results referring to NATS, but no information
about engine self-diagnostic results is displayed on CONSULT.Self-diagnostic results referring to NATS and ``DON'T ERASE
BEFORE CHECKING ENG DIAG'' are displayed on CONSULT.
(This means that engine trouble data has been detected in
ECM.)
Turn ignition switch ``OFF''.
Repair NATS.
(If necessary, carry out ``SELF-FUNCTION CHECK'' or ``C/U INI-
TIALISATION'' with CONSULT.)Turn ignition switch ``OFF''.
Turn ignition switch ``ON''.Repair NATS.
(If necessary, carry out ``SELF-FUNCTION CHECK'' or ``C/U INI-
TIALISATION'' with CONSULT.)
Erase the NATS ``SELF-DIAG RESULTS'' by using CONSULT.
(Touch ``ERASE''.)Do not erase the NATS ``SELF-DIAG RESULTS'' by using
CONSULT.
Start the engine.
Start the engine.Check the NATS ``SELF-DIAG RESULTS'' by using CONSULT.
OKNG
NGVerify no blinking of MIL*.
OKTurn ignition switch ``OFF''.
CHECK OUTCheck the engine ``SELF-DIAG RESULTS'' with CONSULT by
using the CONSULT generic program card.
(Engine diagnostic software included)b
Perform running test with CONSULT in engine ``SELF-DIAG
RESULTS'' mode.Repair ECCS. (Refer to EC section.)
NGVerify ``NO FAILURE'' displayed on the CONSULT screen.
OKTurn ignition switch ``ON''.
CHECK OUTErase the engine ``SELF-DIAG RESULTS'' by using CONSULT.
(Touch ``ERASE''.)
Start the engine.
.
.
.
..
.
..
..
..
.
..
..
..
..
..
..
.
NATS (Nissan Anti-Theft System)/RHD MODELS
EL-259

SYMPTOM CHART
SYMPTOMDisplayed ``SELF-DIAG
RESULTS'' on CONSULT
screen.DIAGNOSTIC PROCEDURE
(Reference page)SYSTEM
(Malfunctioning
part or mode)
+MIL blinking
+Engine can start.IMMUPROCEDURE 1
(EL-261)IMMU
ECMPROCEDURE 2
(EL-261)ECM
+MIL blinking
+Engine hard to startCHAIN OF ECM-IMMUPROCEDURE 3
(EL-262)Open circuit in battery voltage line of IMMU circuit
Open circuit in ignition line of IMMU circuit
Open circuit in ground line of IMMU circuit
Open or short circuit in communication line
between IMMU and ECM
Open circuit in power source line of ANT/AMP cir-
cuit
ECM
IMMU
DIFFERENCE OF KEYPROCEDURE 4
(EL-264)Unregistered key
IMMU
CHAIN OF IMMU-KEYPROCEDURE 5
(EL-265)Open or short circuit in communication line
between ANT/AMP and IMMU
Open circuit in power source line of ANT/AMP cir-
cuit
Open circuit in ground line of ANT/AMP circuit
Malfunction of key ID chip
IMMU
Antenna amp.
ID DISCORD, IMM-ECMPROCEDURE 6
(EL-266)System initialisation has not yet been completed.
ECM
MINGLE NOISEPROCEDURE 7
(EL-267)Noise interference in communication line
+MIL blinking
+Engine hard to start
+NATS security indicator
does not blink for 1 minute
after ignition switch is
turned to ``OFF''.LOCK MODEPROCEDURE 9
(EL-268)LOCK MODE
+MIL staying ONDON'T ERASE BEFORE
CHECKING ENG DIAGWORK FLOW
(EL-259)Engine trouble data and NATS trouble data have
been detected in ECM
+NATS security ind. does not
light up.
+Engine can start.ÐPROCEDURE 8
(EL-267)NATS security ind.
Open circuit between Fuse and NATS IMMU
Continuation of initialisation mode
NATS IMMU
*Lighting-up mode of MIL (Malfunction Indicator Lamp)
For single malfunction of NATS: Blinking
For dual malfunctions of NATS and an engine-related part: Stays ON
For single malfunction of an engine-related part: Stays ON
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-260

DIAGNOSTIC PROCEDURE 3
Self-diagnostic results:
``CHAIN OF ECM-IMMU'' displayed on CONSULT screen
Con®rm SELF-DIAGNOSTIC
RESULTS ``CHAIN OF ECM-
IMMU'' displayed on CONSULT
screen.
OK
CHECK POWER SUPPLY CIRCUIT FOR
IMMU.
Check voltage between terminalj
4of
IMMU and ground with CONSULT or
tester.
Voltage: Battery voltage
OK
cNG
Check the following:
+7.5A fuse (No.
50,
located in the fuse and
fusible link box)
+Harness for open or
short between fuse and
IMMU connector
CHECK IGN SW. ON SIGNAL.
Check voltage between terminalj
3of
IMMU and ground with CONSULT or
tester.
Voltage: Battery voltage
OK
cNG
Check the following:
+10A fuse [No.
25,
located in the fuse block
(J/B)]
+Harness for open or
short between fuse and
IMMU connector
CHECK GROUND CIRCUIT FOR IMMU.
Check harness continuity between IMMU
terminalj
8,j9and ground.
Continuity should exist.
OK
cNG
Repair harness.
CHECK COMMUNICATION ON OPEN
CIRCUIT.
Check harness continuity between the fol-
lowing ECM terminal and IMMU terminal.
ECMj
55and IMMUj6
Continuity should exist.
OK
cNG
Repair harness.
jA
SEL333U
SEL867UD
SEL868UD
SEL499V
SEL500V
.
.
.
.
.
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-262

jA
CHECK COMMUNICATION LINE SHORT
CIRCUIT.
1. Disconnect ECM connector and IMMU
connector.
2. Check continuity between IMMU termi-
nalj
6and ground.
Continuity should not exist.
3. Turn ignition switch to ON.
4. Check voltage between IMMU terminal
j
6and ground.
No voltage should exist.
OK
cNG
Repair harness.
CHECK NATS ANTENNA AMP. CIRCUIT.
1. Disconnect NATS antenna amp. con-
nector.
2. Turn ignition switch ``ON''.
3. Check voltage between antenna amp.
terminalj
4and ground.
Voltage: More than 4.7V
OK
cNG
Repair harness.
SELF-FUNCTION CHECK
1. Connect ECM connector and
disconnect IMMU connector.
2. Turn ignition switch ``ON''.
3. Touch ``SELF-FUNCTION
CHECK'' on CONSULT
``SELECT DIAG MODE''
screen.
(See next page)
Touch ``START''. ECM will then
check its communication interface
by itself.
OK
cNG
+ECM is malfunctioning.
1. Replace ECM.
2. Perform initialisation
with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
(See next page)
+IMMU is malfunctioning.
1. Replace IMMU.
2. Perform initialisation with CONSULT.
For the initialisation procedure, refer
to ``CONSULT operation manual
NATS V2.0 (GASOLINE)''.
SEL501V
SEL502V
SEL340U
SEL341U
.
.
.
.
.
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-263