NISSAN PICK-UP 1998 Repair Manual

Component Parts and Harness Connector
Location
System Description
NATS has the following immobiliser functions:
lSince only NATS ignition keys, whose IDs. 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.
lBoth 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.
lThe 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.
lWhen NATS detects trouble, the malfunction indicator lamp (MIL) blinks.
lNATS 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.
lWhen servicing a malfunction of the NATS (indicated by flashing of Malfunction Indicator Lamp)
or registering another NATS ignition key ID no., it may be necessary to re-register original key
identification. Therefore, be sure to receive all keys from vehicle owner.
SEL649V
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
EL-183

System Composition
The immobiliser function of the NATS consists of the following:
lNATS ignition key
lNATS immobiliser control unit (NATS IMMU) located in the ignition key cylinder
lEngine control module (ECM)
lNATS security indicator
lMalfunction indicator lamp (MIL)
SEL402V
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
EL-184

Wiring Diagram Ð NATS Ð
HEL388A
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
EL-185

CONSULT
CONSULT INSPECTION PROCEDURE
1. Turn off ignition switch.
2. Connect ``CONSULT'' to Data link connector for CONSULT.
3. Insert NATS program card into CONSULT.
b
: Program card
NATS-E940
4. Turn on ignition switch.
5. Touch ``START''.
6. Touch ``V.2.0 (GASOLINE)''.
7. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT Operation
Manual, NATS V2.0 (GASOLINE).
SEF056U
SEL327U
SEL328U
SEL329U
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
EL-186

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
NOTE:
lIf trip number is more than 1, MIL does not blink.
lTime data is not indicated for this model.
SELF-DIAGNOSTIC RESULTS ITEM CHART
Detected items (Screen terms) Description Reference page
IMMU ECM received the signal from IMMU that IMMU is malfunctioning. EL-190
ECM ECM is malfunctioning. EL-190
CHAIN OF ECM-IMMU Communication impossible between ECM and IMMU. EL-191
DIFFERENCE OF KEYIMMU can receive the key ID signal but the result of ID verification between key ID
and IMMU is NG.EL-193
CHAIN OF IMMU-KEY IMMU cannot receive the key ID signal. EL-194
ID DISCORD, IMM-ECMThe result of ID verification between IMMU and ECM is NG. System initialisation is
required.EL-194
MINGLE NOISENoise (interference) mingled into NATS communication lines during communicat-
ing.EL-195
DON'T ERASE BEFORE CHECKING
ENG DIAGEngine trouble data and NATS trouble data have been detected in ECM. EL-188
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-196
SEL332UE
.Result display screen (When no malfunction is detected).Result display screen (When no malfunction is detected)
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
CONSULT (Cont'd)
EL-187

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)
TROUBLE KEY 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
INITIALISATION'' with CONSULT.)Turn ignition switch ``OFF''.
Turn ignition switch ``ON''.Repair NATS.
(If necessary, carry out ``SELF-FUNCTION CHECK'' or ``C/U
INITIALISATION'' 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)/Gasoline engine for LHD models
EL-188

SYMPTOM CHART
SYMPTOMDisplayed ``SELF-DIAG RESULTS''
on CONSULT screen.DIAGNOSTIC PROCEDURE
(Reference page)SYSTEM
(Malfunctioning part or mode)
lMIL blinkinglEngine will startIMMUPROCEDURE 1
(EL-190)IMMU
ECMPROCEDURE 2
(EL-190)ECM
lMIL blinkinglEngine does not startCHAIN OF ECM-IMMUPROCEDURE 3
(EL-191)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 communica-
tion line between IMMU and ECM
ECM
IMMU
DIFFERENCE OF KEYPROCEDURE 4
(EL-193)Unregistered key
IMMU
CHAIN OF IMMU-KEYPROCEDURE 5
(EL-194)Malfunction of key ID chip
IMMU
ID DISCORD, IMM-ECMPROCEDURE 6
(EL-194)System initialisation has not yet
been completed.
ECM
IMMU
MINGLE NOISEPROCEDURE 7
(EL-195)Noise interference in communica-
tion line
LOCK MODEPROCEDURE 8
(EL-196)LOCK MODE
lMIL staying ONDON'T ERASE BEFORE CHECK-
ING ENG DIAGWORK FLOW
(EL-188)Engine trouble data and NATS
trouble data have been detected in
ECM.
lSecurity indicator does not oper-
ate properly.
lEngine starts properly.ÐPROCEDURE 9
(EL-197)Security indicator circuit
Security indicator
Continuation of initialisation mode
*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)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-189

DIAGNOSTIC PROCEDURE 1
Self-diagnostic results:
``IMMU'' displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC RESULTS ``IMMU'' displayed on CON-
SULT screen.
lIMMU is malfunctioning.
1. Replace IMMU.
2. Perform initialisation with CONSULT.
For the initialisation procedure, refer to ``CONSULT operation manual NATS
V2.0 (GASOLINE)''.
DIAGNOSTIC PROCEDURE 2
Self-diagnostic results:
``ECM'' displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC RESULTS ``ECM'' displayed on CON-
SULT screen.
lECM is malfunctioning.
1. Replace ECM.
2. Perform initialisation with CONSULT.
For the initialisation procedure, refer to ``CONSULT operation manual NATS
V2.0 (GASOLINE)''.
SEL330U
SEL331U
.
.
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-190

DIAGNOSTIC PROCEDURE 3
Self-diagnostic results:
``CHAIN OF ECM-IMMU'' displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC
RESULTS ``CHAIN OF ECM-
IMMU'' displayed on CONSULT
screen.
OK
CHECK POWER SUPPLY CIRCUIT FOR
IMMU.
Check voltage between IMMU terminal
V8and ground.
Battery voltage should exist.
OK
cNG
Check the following.
l10A fuse (No.34,
located in the fusible link
and fuse box)
lHarness for open or
short between fuse and
IMMU connector
CHECK IGN SW. ON SIGNAL.
Check voltage between IMMU terminal
V7and ground while ignition switch is
``ON'' position.
Battery voltage should exist.
OK
cNG
Check the following.
l10A fuse (No.23,
located in the fuse block)
lHarness for open or
short between fuse and
IMMU connector
CHECK GROUND CIRCUIT FOR IMMU.
Check continuity between IMMU terminal
V4and ground.
Continuity should exist.
OK
cNG
Repair harness.
CHECK COMMUNICATION LINE OPEN
CIRCUIT.
Check continuity between IMMU terminal
V1and ECM terminalV9.
Continuity should exist.
OK
cNG
Repair harness.
VA
SEL333U
SEL395VC
SEL396VC
SEL397VC
SEL633V
.
.
.
.
.
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-191

VA
CHECK COMMUNICATION LINE
SHORT CIRCUIT.
1. Disconnect ECM connector and IMMU
connector.
2. Check continuity between IMMU termi-
nal
V1and ground.
Continuity should not exist.
3. Turn ignition switch to ON.
4. Check voltage between IMMU terminal
V1and ground.
No voltage should exist.
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.
Touch ``START''. ECM will then
check its communication interface
by itself.
OK
cNGlECM is malfunctioning.
1. Replace ECM.
2. Perform initialisation
with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
lIMMU is malfunctioning.
1. Replace IMMU.
2. Perform initialisation with CONSULT.
For the initialisation procedure, refer to
``CONSULT operation manual NATS
V2.0''.
SEL399VC
SEL340U
SEL341U
SEL342U
.
.
.
.
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-192