Page 1501 of 1659

CONSULT DIAGNOSTIC TEST MODE FUNCTION
CONSULT diagnostic test mode Description
C/U INITIALISATION Two types of initialisation are available. For details, refer to ``INITIALISATION'' shown below.
SELF-FUNCTION CHECK IMMU checks its own NATS communication interface.
SELF-DIAGNOSTIC RESULTS Self-diagnostic results can be read and erased quickly.
INITIALISATION
Initialisation type Description
SYSTEM INITIALISATIONAll registered ignition key IDs in IMMU and CSOLU can be registered.
It takes around 16 minutes.
When the following component is replaced, this initialisation is required.
lIMMU
lCSOLU
IMMU INITIALISATIONAll registered ignition key IDs in IMMU can be initialised and new IDs can be registered.
When the following component is replaced or new NATS ignition key is registered, this ini-
tialisation is required.
lNATS ignition key
NOTE:
When any of initialisation is performed, all of ID codes previously registered will be erased. So all of NATS
ignition keys must be registered again.
If unregistered key is used to try to start the engine, the system may show ``KEY ID [DIFFERENCE]'' as a
self-diagnostic result on CONSULT screen.
HOW TO READ SELF-DIAGNOSTIC RESULTS
SEL664U
NATS (Nissan Anti-Theft System)/Diesel engine
CONSULT (Cont'd)
EL-203
Page 1503 of 1659
Trouble Diagnoses
WORK FLOW
CHECK IN
Listen to customer complaints or request. (Get symptoms.)
TROUBLEKEY SERVICE REQUEST (Additional key ID registration)
.Verify the lighting of security ind. with ignition switch in ``ON''
position.IMMU INITIALISATION
[Refer to CONSULT operation
manual NATS V2.0 (Diesel).]
cUsing the CONSULT program card for NATS check the ``SELF-
DIAG RESULTS'' with CONSULT.
Information about self-diagnostic results referring to NATS is
displayed on CONSULT.
Turn ignition switch ``OFF''.
Repair NATS.
(If necessary, carry out ``SELF-FUNCTION CHECK'' or ``INI-
TIALISATION'' with CONSULT.)
Turn ignition switch ``ON''.
Erase the NATS ``SELF-DIAG RESULTS'' by using CONSULT.
(Touch ``ERASE''.)
Turn ignition switch ``OFF''.
Wait approx. 5 seconds and turn ignition switch ``ON''.
NGVerify no lighting of security ind.
OK
CHECK OUT
.
.
.
.
.
.
.
.
.
.
.
.
NATS (Nissan Anti-Theft System)/Diesel engine
EL-205
Page 1506 of 1659
DIAGNOSTIC PROCEDURE 3
Self-diagnostic results:
``CHAIN OF CSOLU-IMM'' displayed on CONSULT
screen
Confirm SELF-DIAGNOSTIC
RESULTS ``CHAIN OF CSOLU-
IMM'' displayed on CONSULT
screen.
OK
CHECK CSOLU POWER SOURCE CIR-
CUIT.
Check voltage between CSOLU terminal
V2and ground.
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
CSOLU connector
CHECK GROUND CIRCUIT FOR
CSOLU.
Check harness continuity between
CSOLU terminal
V3and ground.
Continuity should exist.
OK
cNG
Repair harness.
CHECK COMMUNICATION LINE OPEN
CIRCUIT.
1. Disconnect CSOLU connector and
IMMU connector.
2. Check harness continuity between
CSOLU terminal
V1and IMMU termi-
nal
V5.
Continuity should exist.
OK
cNG
Repair harness.
VA
SEL683U
SEL467VA
SEL468VA
SEL469VA
.
.
.
.
NATS (Nissan Anti-Theft System)/Diesel engine
Trouble Diagnoses (Cont'd)
EL-208
Page 1507 of 1659

VA
CHECK COMMUNICATION LINE
SHORT CIRCUIT.
1. Disconnect CSOLU connector and
IMMU connector.
2. Check continuity between IMMU termi-
nal
V5and ground.
Continuity should not exist.
3. Turn ignition switch to ON.
4. Check voltage between IMMU terminal
V5and ground.
No voltage should exist.
OK
cNG
Repair harness.
SELF-FUNCTION CHECK
1. Connect IMMU connector and
disconnect CSOLU connector.
2. Turn ignition switch ``ON''.
3. Touch ``SELF-FUNCTION
CHECK'' on CONSULT
``SELECT DIAG MODE''
screen.
Touch ``START''. IMMU will then
check its communication interface
by itself.
OK
cNGlIMMU is malfunctioning.
1. Replace IMMU.
2. Perform system initiali-
sation with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(Diesel)''.
lCSOLU is malfunctioning.
1. Replace CSOLU.
2. Perform system initialisation with
CONSULT. For the initialisation
procedure, refer to ``CONSULT
operation manual NATS V2.0 (Die-
sel)''.
SEL455VA
SEL340U
SEL690U
SEL691U
.
.
.
.
NATS (Nissan Anti-Theft System)/Diesel engine
Trouble Diagnoses (Cont'd)
EL-209
Page 1508 of 1659
![NISSAN PICK-UP 1998 Repair Manual DIAGNOSTIC PROCEDURE 4
Self-diagnostic results:
``KEY ID [DIFFERENCE] displayed on CONSULT
screen
Confirm SELF-DIAGNOSTIC RESULTS
``KEY ID [DIFFERENCE] is displayed on
CONSULT screen.
1. Turn the NISSAN PICK-UP 1998 Repair Manual DIAGNOSTIC PROCEDURE 4
Self-diagnostic results:
``KEY ID [DIFFERENCE] displayed on CONSULT
screen
Confirm SELF-DIAGNOSTIC RESULTS
``KEY ID [DIFFERENCE] is displayed on
CONSULT screen.
1. Turn the](/manual-img/5/57374/w960_57374-1507.png)
DIAGNOSTIC PROCEDURE 4
Self-diagnostic results:
``KEY ID [DIFFERENCE]'' displayed on CONSULT
screen
Confirm SELF-DIAGNOSTIC RESULTS
``KEY ID [DIFFERENCE]'' is displayed on
CONSULT screen.
1. Turn the ignition switch to OFF posi-
tion and wait 1 minute.
(After 1 minute, security indicator will
blink.)
2. Turn the ignition key switch to ON
position with a registered key.
(Do not start engine.) Wait 5 seconds.
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
cYes
System is OK.
PERFORM IMMU INITIALISATION.
Perform IMMU initialisation with CON-
SULT.
For the initialisation procedure, refer to
``CONSULT operation manual NATS V2.0
(Diesel)''.
Can the system be initialised?
Note: If the initialisation is incompleted or
failed, CONSULT shows
mes-
sage on the screen.
No
cYes
System is OK.
Go to DIAGNOSTIC PROCEDURE 5,
EL-211 to check ``KEY ID [NO INPUT]''.
SEL692U
SEL693U
SEL694U
.
.
.
NATS (Nissan Anti-Theft System)/Diesel engine
Trouble Diagnoses (Cont'd)
EL-210
Page 1509 of 1659
![NISSAN PICK-UP 1998 Repair Manual DIAGNOSTIC PROCEDURE 5
Self-diagnostic results:
``KEY ID [NO INPUT] displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC
RESULTS ``KEY ID [NO INPUT]
displayed on CONSULT screen.
OK
CHECK NATS IGNIT NISSAN PICK-UP 1998 Repair Manual DIAGNOSTIC PROCEDURE 5
Self-diagnostic results:
``KEY ID [NO INPUT] displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC
RESULTS ``KEY ID [NO INPUT]
displayed on CONSULT screen.
OK
CHECK NATS IGNIT](/manual-img/5/57374/w960_57374-1508.png)
DIAGNOSTIC PROCEDURE 5
Self-diagnostic results:
``KEY ID [NO INPUT]'' displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC
RESULTS ``KEY ID [NO INPUT]''
displayed on CONSULT screen.
OK
CHECK NATS IGNITION KEY ID CHIP.
Start engine with another registered
NATS ignition key.
Can the engine start?
NoYes
clIgnition key ID chip is
malfunctioning.
1. Replace the ignition
key.
2. Perform IMMU initialisa-
tion with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(Diesel)''.
CHECK IMMU FUNCTION 1.
1. Turn ignition switch ``ON''.
2. Check voltage between IMMU terminal
V2and ground.
Note:
Do not remove NATS antenna amp. from
the ignition key cylinder.
OK
cNG
Check harness for open or
short between IMMU and
NATS antenna amp. If
harness is OK, replace
IMMU. After replacing
IMMU, perform system
initialisation with CON-
SULT.
For the initialisation
procedure, refer to ``CON-
SULT operation manual
NATS V2.0 (Diesel)''.
CHECK IMMU FUNCTION 2.
1. Turn ignition switch ``ON''.
2. Check voltage between NATS antenna
amp. terminal
V3and ground.
Voltage:
6 sec. after turning ignition switch
``ON''
Approx. 4.5 - 5.3V
Note:
Do not remove NATS antenna amp. from
the ignition key cylinder.
OK
cNG
CHECK IMMU OUTPUT VOLTAGE.
1. Turn the ignition switch ``ON''.
2. Check voltage between NATS antenna
amp. terminal
V1and ground.
Voltage: More than 4.7V
OK
m
NG
VA
Time (After turning ignition
switch ``ON''.)Voltage [V]
For approx. 0.5 sec. Approx. 2.3 - 5
After 1 sec. 0
SEL695U
SEL634V
SEL635V
SEL636V
.
.
.
.
.
NATS (Nissan Anti-Theft System)/Diesel engine
Trouble Diagnoses (Cont'd)
EL-211
Page 1510 of 1659
VA
CHECK ANTENNA AMP. GROUND
LINE CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Check continuity between NATS
antenna amp. terminal
V4and ground.
Continuity should exist.
OK
cNG
Check harness for open or
short between NATS
antenna amp. and IMMU.
If harness is OK, replace
IMMU. After replacing
IMMU, perform system
initialisation with CON-
SULT. For the initialisation
procedure, refer to ``CON-
SULT operation manual
NATS V2.0 (Diesel)''.
NATS antenna amp. is malfunctioning.
When replacing the amp. hold on to amp.
body. Take care not to pull on amp. har-
ness.
SEL637V
.
.
NATS (Nissan Anti-Theft System)/Diesel engine
Trouble Diagnoses (Cont'd)
EL-212
Page 1511 of 1659

DIAGNOSTIC PROCEDURE 6
Self-diagnostic results:
``ID DSCORD, IMM-CSLU'' displayed on CONSULT
screen
Confirm SELF-DIAGNOS-
TIC RESULTS ``ID
DSCORD, IMM-CSLU*''
displayed on CONSULT
screen.* ``ID DSCORD, IMM-CSLU'':
Registered ID of IMMU is in discord
with that of CSOLU.
Perform system initialisa-
tion with CONSULT.
Re-register all NATS igni-
tion key IDs.
For the operation of sys-
tem initialisation, refer to
``CONSULT operation
manual NATS V2.0 (Die-
sel)''.
Initialisation
completedInitialisation
incompleted
cTurn the ignition
key and CONSULT
power switch
``OFF''. Then turn
the ignition key
``ON''.
Initialisation
incompleted or
failed with CON-
SULT
cConfirm system ini-
tialisation result
``INITIALISATION
STOPPED OR
FAILED'' displayed
on CONSULT
screen.
Start engine.
OK
CHECK SELF-DIAG
RESULTS.
1. Turn the ignition switch
``OFF'' and ``ON''.
2. Touch ``SELF-DIAG
RESULTS'' on CONSULT
``SELECT DIAG MODE''
screen.
END
``IMMU'' is displayed. ``CSOLU'' is displayed.
..
If ``IMMU'' is displayed on CON-
SULT screen, IMMU is malfunc-
tioning.If ``CSOLU'' is displayed on CON-
SULT screen, CSOLU is malfunc-
tioning.
Replace IMMU.Replace CSOLU.
..
Perform system initialisation
with CONSULT.
For the operation of system
initialisation, refer to ``CON-
SULT operation manual NATS
V2.0 (Diesel)''.
SEL696U
SEL698U
SEL697U
SEL678U
SEL679U
.
..
.
..
.
NATS (Nissan Anti-Theft System)/Diesel engine
Trouble Diagnoses (Cont'd)
EL-213