check engine NISSAN PICK-UP 1998 Repair Manual

Trouble Diagnoses
Symptom Possible causes Repair order
Radio inoperative (no digital
display and no sound from
speakers).1. 10A fuse
2. Poor radio case ground
3. Radio1. Check 10A fuse (No.
18, located in fuse block). Turn igni-
tion switch ON and verify battery positive voltage is present
at terminal
V10of radio.
2. Check radio case ground.
3. Remove radio for repair.
Radio controls are operational,
but no sound is heard from
any speaker.1. Radio output
2. Radio1. Check radio output voltages.
2. Remove radio for repair.
Radio presets are lost when
ignition switch is turned OFF.1. 7.5A fuse
2. Radio1. Check 7.5A fuse (No.
6, located in fuse block) and verify
battery positive voltage is present at terminal
V6of radio.
2. Remove radio for repair.
Individual speaker is noisy or
inoperative.1. Speaker
2. Radio output
3. Speaker circuit
4. Radio1. Check speaker.
2. Check radio output voltages.
3. Check wires for open or short between radio and speaker.
4. Remove radio for repair.
Radio stations are weak or
noisy.1. Antenna
2. Poor radio ground
3. Radio1. Check antenna.
2. Check radio ground.
3. Remove radio for repair.
Radio generates static noise
with engine running.1. Poor radio ground
2. Loose or missing ground bonding straps
3. Ignition condenser or rear window defogger
noise suppressor condenser
4. Alternator
5. Ignition coil or secondary wiring
6. Radio1. Check radio ground.
2. Check ground bonding straps.
3. Replace ignition condenser or rear window defogger noise
suppressor condenser.
4. Check alternator.
5. Check ignition coil and secondary wiring.
6. Remove radio for repair.
Radio generates static noise
with accessories on (switch
pops and motor noise).1. Poor radio ground
2. Antenna
3. Accessory ground
4. Faulty accessory1. Check radio ground.
2. Check antenna.
3. Check accessory ground.
4. Replace accessory.
SPEAKER INSPECTION
1. Disconnect speaker harness connector.
2. Measure the resistance between speaker terminals
V1andV2.
lThe resistance should be2-4W.
3. Using jumper wires, momentarily connect a 9V battery between speaker terminals
V1andV2.
lA momentary hum or pop should be heard.
ANTENNA INSPECTION
Using a jumper wire, clip an auxiliary ground between antenna and body.
lIf reception improves, check antenna ground (at body surface).
lIf reception does not improve, check main feeder cable for short circuit or open circuit.
RADIO INSPECTION
All voltage inspections are made with:
lIgnition switch ON or ACC
lRadio ON
lRadio connected (If removed for inspection, supply a ground to the case using a jumper wire.)
AUDIO
EL-142

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 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

DIAGNOSTIC PROCEDURE 5
Self-diagnostic results:
``CHAIN OF IMMU-KEY'' displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC
RESULTS ``CHAIN OF IMMU-
KEY'' displayed on CONSULT
screen.
OK
CHECK NATS IGNITION KEY ID CHIP.
Can the engine start with another regis-
tered NATS ignition key?
No
cYeslIgnition key ID chip is
malfunctioning.
1. Replace the ignition
key.
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''.
DIAGNOSTIC PROCEDURE 6
Self-diagnostic results:
``ID DISCORD, IMM-ECM'' displayed on CONSULT screen
Confirm SELF-DIAGNOSTIC
RESULTS ``ID DISCORD, IMM-
ECM*'' displayed on CONSULT
screen.* ``ID DISCORD, IMM-ECM'':
Registered ID of IMMU is
in discord with that of
ECM.
PERFORM INITIALISATION.
Perform initialisation with CONSULT.
Re-register all NATS ignition key IDs.
For the initialisation procedure, refer to
``CONSULT operation manual NATS
V2.0''.
Can the system be initialized?
Note: If the initialisation is not completed
or fails, CONSULT shows
mes-
sage on the screen.
Yes
cNolECM is malfunctioning.
1. Replace ECM.
2. Perform initialisation
with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
END.
(System initialisation was not completed.)
SEL373U
SEL383U
SEL372U
.
.
.
.
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-194

DIAGNOSTIC PROCEDURE 8
Self-diagnostic results:
``LOCK MODE'' displayed on CONSULT screen
Confirm 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
position 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
cYes
System is OK.
(Now the system is
escaped from ``LOCK
MODE''.)
CHECK NATS IMMU INSTALLATION.
Refer to ``How to Replace NATS IMMU''
in EL-197.
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
cYes
System is OK.
Go to DIAGNOSTIC PROCEDURE 5,
EL-194 to check ``CHAIN OF IMMU-
KEY''.
SEL790U
SEL038V
.
.
.
.
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-196

DIAGNOSTIC PROCEDURE 9
Security indicator check
CHECK INDICATOR CIRCUIT.
1. Disconnect NATS IMMU connector.
2. Check voltage between NATS IMMU
terminal
V6and ground.
Battery voltage should exist.
OK
cNG
Check the following.
l7.5A fuse (No.6,
located in the fuse block)
lSecurity indicator
lHarness for open or
short between fuse and
security indicator
lHarness for open or
short between NATS
IMMU and security indi-
cator
PERFORM INITIALISATION.
Perform initialisation with CONSULT.
For the initialisation procedure, refer to
``CONSULT operation manual NATS V2.0
(GASOLINE)''.
How to Replace NATS IMMU
NOTE:
lIf NATS IMMU is not installed correctly, NATS system
will not operate properly and SELF-DIAG RESULTS on
CONSULT screen will show ``LOCK MODE'' or ``CHAIN
OF IMMU-KEY''.
SEL400VC
SEL498V
.
NATS (Nissan Anti-Theft System)/Gasoline engine for LHD models
Trouble Diagnoses (Cont'd)
EL-197

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