fuel NISSAN ALMERA 2001 User Guide

ENGINE CONTROL SYSTEM
SECTION
EC
CONTENTS
QG
TROUBLE DIAGNOSIS - INDEX..................................10
Alphabetical & P No. Index for DTC .........................10
PRECAUTIONS.............................................................16
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER².............16
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T.........................................16
Engine Fuel & Emission Control System ..................17
Wiring Diagrams and Trouble Diagnosis ...................19
PREPARATION.............................................................20
Special Service Tools ................................................20
Commercial Service Tools .........................................20
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.........................................................................21
Engine Control Component Parts Location ...............21
Circuit Diagram ..........................................................25
System Diagram ........................................................29
Vacuum Hose Drawing ..............................................30
System Chart .............................................................31
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION...............................................32
Multiport Fuel Injection (MFI) System .......................32
Electronic Ignition (EI) System ..................................34
Air Conditioning Cut Control ......................................35
Fuel Cut Control (at no load & high engine
speed) ........................................................................36
Evaporative Emission System ...................................36
Positive Crankcase Ventilation ..................................39
BASIC SERVICE PROCEDURE...................................40
Fuel Pressure Release ..............................................40
Fuel Pressure Check .................................................40
Fuel Pressure Regulator Check ................................41
Injector .......................................................................41
How to Check Idle Speed and Ignition Timing ..........43
Preparation ................................................................44
Inspection Procedure .................................................47
Idle Air Volume Learning ...........................................57ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION...............................................................59
Introduction ................................................................59
Two Trip Detection Logic ...........................................59
Emission-related Diagnostic Information ...................60
NATS (Nissan Anti-theft System) ..............................74
Malfunction Indicator (MI) ..........................................74
OBD System Operation Chart (With Euro-OBD
Models Only)..............................................................78
CONSULT-II ...............................................................83
Generic Scan Tool (GST) ..........................................94
TROUBLE DIAGNOSIS - INTRODUCTION..................96
Introduction ................................................................96
Work Flow ..................................................................98
TROUBLE DIAGNOSIS - BASIC INSPECTION.........100
Basic Inspection/Sedan ...........................................100
Basic Inspection/Hatchback.....................................128
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION.............................................................153
DTC Inspection Priority Chart..................................153
Fail-safe Chart .........................................................154
Symptom Matrix Chart .............................................155
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................159
Major Sensor Reference Graph in Data Monitor
Mode ........................................................................161
ECM Terminals and Reference Value .....................164
TROUBLE DIAGNOSIS - SPECIFICATION VALUE..173
Description ...............................................................173
Testing Condition .....................................................173
Inspection Procedure ...............................................173
Diagnostic Procedure ..............................................174
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................177
Description ...............................................................177
Diagnostic Procedure ..............................................177
TROUBLE DIAGNOSIS FOR POWER SUPPLY........178
Main Power Supply and Ground Circuit ..................178

On Board Diagnosis Logic.......................................252
DTC Confirmation Procedure ..................................253
Wiring Diagram ........................................................254
Diagnostic Procedure ..............................................256
Component Inspection .............................................257
DTC P0137 HEATED OXYGEN SENSOR 2
(REAR) (MIN. VOLTAGE MONITORING)...................258
Component Description ...........................................258
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................258
ECM Terminals and Reference Value .....................258
On Board Diagnosis Logic.......................................258
DTC Confirmation Procedure ..................................259
Overall Function Check ...........................................260
Wiring Diagram ........................................................261
Diagnostic Procedure ..............................................263
Component Inspection .............................................265
DTC P0138 HEATED OXYGEN SENSOR 2
(REAR) (MAX. VOLTAGE MONITORING).................267
Component Description ...........................................267
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................267
ECM Terminals and Reference Value .....................267
On Board Diagnosis Logic.......................................267
DTC Confirmation Procedure ..................................268
Overall Function Check ...........................................269
Wiring Diagram ........................................................270
Diagnostic Procedure ..............................................272
Component Inspection .............................................273
DTC P0139 HEATED OXYGEN SENSOR 2
(REAR).........................................................................275
Component Description ...........................................275
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................275
ECM Terminals and Reference Value .....................275
On Board Diagnosis Logic.......................................275
DTC Confirmation Procedure ..................................276
Overall Function Check ...........................................277
Wiring Diagram ........................................................278
Diagnostic Procedure ..............................................280
Component Inspection .............................................282
DTC P0140 HEATED OXYGEN SENSOR 2
(REAR) (HIGH VOLTAGE)..........................................284
Component Description ...........................................284
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................284
ECM Terminals and Reference Value .....................284
On Board Diagnosis Logic.......................................284
DTC Confirmation Procedure ..................................285
Overall Function Check ...........................................285
Wiring Diagram ........................................................286
Diagnostic Procedure ..............................................288Component Inspection .............................................289
DTC P0141 HEATED OXYGEN SENSOR 2
HEATER (REAR).........................................................291
Description ...............................................................291
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................291
ECM Terminals and Reference Value .....................291
On Board Diagnosis Logic.......................................292
DTC Confirmation Procedure ..................................292
Wiring Diagram ........................................................293
Diagnostic Procedure ..............................................295
Component Inspection .............................................296
DTC P0171 FUEL INJECTION SYSTEM
FUNCTION (LEAN SIDE)............................................297
On Board Diagnosis Logic.......................................297
DTC Confirmation Procedure ..................................297
Wiring Diagram ........................................................299
Diagnostic Procedure ..............................................301
DTC P0172 FUEL INJECTION SYSTEM
FUNCTION (RICH SIDE).............................................305
On Board Diagnosis Logic.......................................305
DTC Confirmation Procedure ..................................305
Wiring Diagram ........................................................307
Diagnostic Procedure ..............................................309
DTC P0180 FUEL TANK TEMPERATURE
SENSOR (WHERE FITTED)........................................313
Component Description ...........................................313
On Board Diagnosis Logic.......................................313
DTC Confirmation Procedure ..................................313
Wiring Diagram ........................................................315
Diagnostic Procedure ..............................................316
Component Inspection .............................................317
DTC P0300 - P0304 NO.4-1CYLINDER
MISFIRE, MULTIPLE CYLINDER MISFIRE...............318
On Board Diagnosis Logic.......................................318
DTC Confirmation Procedure ..................................318
Diagnostic Procedure ..............................................319
DTC P0325 KNOCK SENSOR (KS)...........................324
Component Description ...........................................324
ECM Terminals and Reference Value .....................324
On Board Diagnosis Logic.......................................324
DTC Confirmation Procedure ..................................324
Wiring Diagram ........................................................325
Diagnostic Procedure ..............................................326
Component Inspection .............................................327
DTC P0335 CRANKSHAFT POSITION SENSOR
(POS)............................................................................328
Component Description ...........................................328
ECM Terminals and Reference Value .....................328
On Board Diagnosis Logic.......................................329
DTC Confirmation Procedure ..................................329
Wiring Diagram ........................................................330
CONTENTS(Cont'd)
EC-3

Diagnostic Procedure ..............................................487
Component Inspection .............................................490
EGR VOLUME CONTROL SYSTEM (WHERE
FITTED)........................................................................491
Description ...............................................................491
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................492
ECM Terminals and Reference Value .....................493
Wiring Diagram ........................................................494
Diagnostic Procedure ..............................................496
Component Inspection .............................................501
EVAP CANISTER PURGE VOLUME CONTROL
SOLENOID VALVE......................................................503
Description ...............................................................503
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................503
ECM Terminals and Reference Value .....................504
Wiring Diagram ........................................................505
Diagnostic Procedure ..............................................507
Component Inspection .............................................510
IDLE AIR CONTROL VALVE (IACV) - AUXILIARY
AIR CONTROL............................................................ 511
Description ............................................................... 511
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................512
ECM Terminals and Reference Value .....................512
Wiring Diagram ........................................................513
Diagnostic Procedure ..............................................515
Component Inspection .............................................519
CLOSED THROTTLE POSITION SWITCH
(WHERE FITTED)........................................................520
Component Description ...........................................520
ECM Terminals and Reference Value .....................520
Wiring Diagram ........................................................521
Diagnostic Procedure ..............................................522
Component Inspection .............................................525
INTAKE VALVE TIMING CONTROL SOLENOID
VALVE..........................................................................526
Component Description ...........................................526
Operation .................................................................526
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................526
ECM Terminals and Reference Value .....................526
Wiring Diagram ........................................................527
Diagnostic Procedure ..............................................529
Component Inspection .............................................531
A/T COMMUNICATION LINE......................................532
System Description ..................................................532
Wiring Diagram ........................................................533
Diagnostic Procedure ..............................................534
PARK/NEUTRAL POSITION (PNP) SWITCH............536
Component Description ...........................................536CONSULT-II Reference Value in Data Monitor
Mode ........................................................................536
ECM Terminals and Reference Value .....................536
Wiring Diagram ........................................................537
Diagnostic Procedure ..............................................538
INJECTOR...................................................................541
Component Description ...........................................541
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................541
ECM Terminals and Reference Value .....................541
Wiring Diagram ........................................................542
Diagnostic Procedure ..............................................544
Component Inspection .............................................546
IGNITION SIGNAL.......................................................547
Component Description ...........................................547
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................547
ECM Terminals and Reference Value .....................547
Wiring Diagram ........................................................548
Diagnostic Procedure ..............................................551
Component Inspection .............................................555
START SIGNAL...........................................................557
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................557
ECM Terminals and Reference Value .....................557
Wiring Diagram ........................................................558
Diagnostic Procedure ..............................................559
FUEL PUMP.................................................................561
System Description ..................................................561
Component Description ...........................................561
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................561
ECM Terminals and Reference Value .....................562
Wiring Diagram ........................................................563
Diagnostic Procedure ..............................................564
Component Inspection .............................................566
POWER STEERING OIL PRESSURE SWITCH.........567
Component Description ...........................................567
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................567
ECM Terminals and Reference Value .....................567
Wiring Diagram ........................................................568
Diagnostic Procedure ..............................................569
Component Inspection .............................................570
REFRIGERANT PRESSURE SENSOR......................572
Description ...............................................................572
ECM Terminals and Reference Value .....................572
Wiring Diagram ........................................................573
Diagnostic Procedure ..............................................575
ELECTRICAL LOAD SIGNAL.....................................578
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................578
CONTENTS(Cont'd)
EC-6

ECM Terminals and Reference Value .....................578
Wiring Diagram ........................................................579
Diagnostic Procedure - Load Signal - .....................583
Diagnostic Procedure - Heater Control Panel
(Fan Switch) - ..........................................................589
Component Inspection .............................................590
MI & DATA LINK CONNECTORS..............................591
Wiring Diagram ........................................................591
SERVICE DATA AND SPECIFICATIONS (SDS).......593
Fuel Pressure Regulator..........................................593
Idle Speed and Ignition Timing ................................593
Mass Air Flow Sensor..............................................593
Intake Air Temperature Sensor ................................593
Engine Coolant Temperature Sensor ......................593
Throttle Position Sensor ..........................................593
Heated Oxygen Sensor 1 Heater (Front) ................593
Heated Oxygen Sensor 2 Heater (Rear).................593
Fuel Tank Temperature Sensor (Where Fitted) .......594
EGR Volume Control Valve (Where Fitted) .............594
EGR Temperature Sensor (Where Fitted) ...............594
EVAP Canister Purge Volume Control Valve ..........594
IACV-AAC Valve ......................................................594
Injector .....................................................................594
Ignition Coil with Power Transistor ..........................594
Condenser ...............................................................594
Fuel Pump ...............................................................594
Crankshaft Position Sensor (POS) ..........................595
Camshaft Position Sensor (PHASE) .......................595
YD
TROUBLE DIAGNOSIS - INDEX................................596
Alphabetical & P No. Index for DTC .......................596
PRECAUTIONS...........................................................598
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER²...........598
Engine Fuel & Emission Control System ................599
Precautions ..............................................................600
Wiring Diagrams and Trouble Diagnosis .................601
PREPARATION...........................................................602
Special Service Tools ..............................................602
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.......................................................................603
Engine Control Component Parts Location .............603
Circuit Diagram ........................................................606
System Diagram ......................................................608
System Chart ...........................................................609
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION.............................................610
Fuel Injection Control System .................................610
Fuel Injection Timing Control System...................... 611
Air Conditioning Cut Control ....................................612Fuel Cut Control (at no load & high engine
speed) ......................................................................612
Crankcase Ventilation System .................................613
BASIC SERVICE PROCEDURE.................................614
Injection Tube and Injection Nozzle ........................614
Electronic Control Fuel Injection Pump ...................618
Fuel Filter .................................................................625
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION.............................................................627
DTC and MI Detection Logic ...................................627
Diagnostic Trouble Code (DTC) ..............................627
Malfunction Indicator (MI) ........................................628
CONSULT-II .............................................................632
TROUBLE DIAGNOSIS - INTRODUCTION................637
Introduction ..............................................................637
Work Flow ................................................................639
TROUBLE DIAGNOSIS - BASIC INSPECTION.........641
Basic Inspection.......................................................641
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION.............................................................646
Symptom Matrix Chart .............................................646
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................656
Major Sensor Reference Graph in Data Monitor
Mode ........................................................................658
ECM Terminals and Reference Value .....................659
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................665
Description ...............................................................665
Diagnostic Procedure ..............................................665
TROUBLE DIAGNOSIS FOR POWER SUPPLY........666
Main Power Supply and Ground Circuit ..................666
DTC P0100 MASS AIR FLOW SEN...........................673
Component Description ...........................................673
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................673
ECM Terminals and Reference Value .....................673
On Board Diagnosis Logic.......................................673
DTC Confirmation Procedure ..................................673
Wiring Diagram ........................................................675
Diagnostic Procedure ..............................................677
DTC P0115 COOLANT TEMP SEN............................680
Description ...............................................................680
On Board Diagnosis Logic.......................................680
DTC Confirmation Procedure ..................................680
Wiring Diagram ........................................................682
Diagnostic Procedure ..............................................683
DTC P0120 ACCEL POS SENSOR............................685
Description ...............................................................685
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................685
ECM Terminals and Reference Value .....................685
CONTENTS(Cont'd)
EC-7

On Board Diagnosis Logic.......................................686
DTC Confirmation Procedure ..................................686
Wiring Diagram ........................................................687
Diagnostic Procedure ..............................................688
DTC P0335 CRANK POS SEN (TDC)........................695
Description ...............................................................695
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................695
ECM Terminals and Reference Value .....................695
On Board Diagnosis Logic.......................................695
DTC Confirmation Procedure ..................................696
Wiring Diagram ........................................................697
Diagnostic Procedure ..............................................698
DTC P0500 VEHICLE SPEED SEN............................701
Description ...............................................................701
ECM Terminals and Reference Value .....................701
On Board Diagnosis Logic.......................................701
Overall Function Check ...........................................701
Wiring Diagram ........................................................703
Diagnostic Procedure ..............................................705
DTC P0571 BRAKE SW..............................................706
Description ...............................................................706
ECM Terminals and Reference Value .....................706
On Board Diagnosis Logic.......................................706
DTC Confirmation Procedure ..................................706
Wiring Diagram ........................................................708
Diagnostic Procedure ..............................................710
DTC P1107 ECM 10....................................................714
Description ...............................................................714
On Board Diagnosis Logic.......................................714
DTC Confirmation Procedure ..................................714
Diagnostic Procedure ..............................................715
DTC P1180 P9.FUEL TEMP SEN...............................716
Description ...............................................................716
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................716
ECM Terminals and Reference Value .....................717
On Board Diagnosis Logic.......................................717
DTC Confirmation Procedure ..................................717
Wiring Diagram ........................................................719
Diagnostic Procedure ..............................................721
DTC P1202 FUEL CUT SYSTEM2.............................723
Description ...............................................................723
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................723
ECM Terminals and Reference Value .....................724
On Board Diagnosis Logic.......................................724
DTC Confirmation Procedure ..................................724
Wiring Diagram ........................................................726
Diagnostic Procedure ..............................................728
DTC P1217 OVER HEAT............................................730
Description ...............................................................730CONSULT-II Reference Value in Data Monitor
Mode ........................................................................730
ECM Terminals and Reference Value .....................730
On Board Diagnosis Logic.......................................731
Overall Function Check ...........................................732
Wiring Diagram ........................................................733
Diagnostic Procedure ..............................................735
Main 12 Causes of Overheating..............................756
DTC P1241 P7.F/INJ TIMG FB...................................757
Description ...............................................................757
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................757
ECM Terminals and Reference Value .....................758
On Board Diagnosis Logic.......................................758
DTC Confirmation Procedure ..................................758
Wiring Diagram ........................................................760
Diagnostic Procedure ..............................................762
DTC P1251 P4.SPILL/V CIRC....................................764
Description ...............................................................764
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................764
ECM Terminals and Reference Value .....................765
On Board Diagnosis Logic.......................................765
DTC Confirmation Procedure ..................................765
Wiring Diagram ........................................................767
Diagnostic Procedure ..............................................769
DTC P1337 P2.DTC PULSE SIG................................771
Description ...............................................................771
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................771
ECM Terminals and Reference Value .....................772
On Board Diagnosis Logic.......................................772
DTC Confirmation Procedure ..................................772
Wiring Diagram ........................................................774
Diagnostic Procedure ..............................................776
DTC P1341 P1.CAM POS SEN..................................778
Description ...............................................................778
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................778
ECM Terminals and Reference Value .....................779
On Board Diagnosis Logic.......................................779
DTC Confirmation Procedure ..................................779
Wiring Diagram ........................................................781
Diagnostic Procedure ..............................................783
DTC P1600 P3.PUMP COMM LINE............................785
Description ...............................................................785
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................785
ECM Terminals and Reference Value .....................786
On Board Diagnosis Logic.......................................786
DTC Confirmation Procedure ..................................786
Wiring Diagram ........................................................788
CONTENTS(Cont'd)
EC-8

Alphabetical & P No. Index for DTCNJEC0001Check if the vehicle is a model with the Euro-OBD (E-OBD) system or not by referring to the ªType approval
numberº on the identification plate.
Refer to GI-40, ªIDENTIFICATION PLATEº.
Type approval number Model
Available With Euro-OBD system
Not available Without Euro-OBD system
MODELS WITH EURO-OBD SYSTEMNJEC0001S03Alphabetical Index for DTCNJEC0001S0301
Items
(CONSULT-II screen terms)DTC*6
Reference page
CONSULT-II
GST*2ECM*1*7
Unable to access ECM Ð Ð EC-154
AIR TEMP SEN/CIRC P0110 0110 EC-194
A/T 1ST GR FNCTN P0731 0731 AT-204
A/T 2ND GR FNCTN P0732 0732 AT-211
A/T 3RD GR FNCTN P0733 0733 AT-217
A/T 4TH GR FNCTN P0734 0734 AT-223
A/T DIAG COMM LINE P1605 1605 EC-434
ATF TEMP SEN/CIRC P0710 0710 AT-189
CMP SEN/CIRCUIT P0340 0340 EC-335
CLOSED TP SW/CIRC*7 P0510 0510 EC-385
COOLANT T SEN/CIRC*3 P0115 0115 EC-201
CKP SEN/CIRCUIT P0335 0335 EC-328
CYL 1 MISFIRE P0301 0301 EC-318
CYL 2 MISFIRE P0302 0302 EC-318
CYL 3 MISFIRE P0303 0303 EC-318
CYL 4 MISFIRE P0304 0304 EC-318
ECM P0605 0605 EC-391
EGR SYSTEM*7 P0400 0400 EC-343
EGR SYSTEM*7 P1402 1402 EC-425
EGR TEMP SEN/CIRC*7 P1401 1401 EC-418
EGR VOL CON/V CIR*7 P0403 0403 EC-352
ENGINE SPEED SIG P0725 0725 AT-200
ENG OVER TEMP P1217 1217 EC-406
FUEL SYS-LEAN/BK1 P0171 0171 EC-297
FUEL SYS-RICH/BK1 P0172 0172 EC-305
FUEL TEMP SEN/CIRC*7 P0180 0180 EC-313
HO2S1 HTR (B1) P0135 0135 EC-252
HO2S1 (B1) P0130 0130 EC-216
TROUBLE DIAGNOSIS Ð INDEXQG
Alphabetical & P No. Index for DTC
EC-10

*7: If so equipped
P No. Index for DTCNJEC0001S0302
DTC*6
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*2ECM*1*7
Ð Ð Unable to access ECM EC-154
Ð Flashing*5NO DTC IS DETECTED.
FURTHER TESTING MAYBE REQUIRED.EC-75
Ð 0000NO DTC IS DETECTED.
FURTHER TESTING MAYBE REQUIRED.Ð
P0100 0100 MAF SEN/CIRCUIT*3 EC-187
P0110 0110 AIR TEMP SEN/CIRC EC-194
P0115 0115 COOLANT T SEN/CIRC*3 EC-201
P0120 0120 THRTL POS SEN/CIRC*3 EC-207
P0130 0130 HO2S1 (B1) EC-216
P0131 0131 HO2S1 (B1) EC-224
P0132 0132 HO2S1 (B1) EC-230
P0133 0133 HO2S1 (B1) EC-236
P0134 0134 HO2S1 (B1) EC-245
P0135 0135 HO2S1 HTR (B1) EC-252
P0137 0137 HO2S2 (B1) EC-258
P0138 0138 HO2S2 (B1) EC-267
P0139 0139 HO2S2 (B1) EC-275
P0140 0140 HO2S2 (B1) EC-284
P0141 0141 HO2S2 HTR (B1) EC-291
P0171 0171 FUEL SYS-LEAN/BK1 EC-297
P0172 0172 FUEL SYS-RICH/BK1 EC-305
P0180 0180 FUEL TEMP SEN/CIRC*7 EC-313
P0300 0300 MULTI CYL MISFIRE EC-318
P0301 0301 CYL 1 MISFIRE EC-318
P0302 0302 CYL 2 MISFIRE EC-318
P0303 0303 CYL 3 MISFIRE EC-318
P0304 0304 CYL 4 MISFIRE EC-318
P0325 0325 KNOCK SEN/CIRC-B1 EC-324
P0335 0335 CKP SEN/CIRCUIT EC-328
P0340 0340 CMP SEN/CIRCUIT EC-335
P0400 0400 EGR SYSTEM*7 EC-343
P0403 0403 EGR VOL CON/V CIR*7 EC-352
P0420 0420 TW CATALYST SYS-B1 EC-359
P0443 0443 PURG VOLUME CONT/V EC-364
TROUBLE DIAGNOSIS Ð INDEXQG
Alphabetical & P No. Index for DTC (Cont'd)
EC-12

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NJEC0002The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to NISSAN MODEL N16 is as follows (The compo-
sition varies according to the destination and optional equipment.):
+For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), front seat
belt pre-tensioners, a diagnoses sensor unit, warning lamp, wiring harness and spiral cable.
+For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), side air bag (satellite) sensor, diagnoses sensor unit (one of components of air bags for a frontal
collision), wiring harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
+To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance should be per-
formed by an authorized NISSAN dealer.
+Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harness can be identified by yellow harness connector.
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T
NJEC0003The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) to warn the driver
of a malfunction causing emission deterioration.
CAUTION:
+Be sure to turn the ignition switch ªOFFº and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc.
will cause the MI to light up.
+Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
+Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector.
For description and how to disconnect, refer to EL section, ªDescriptionº, ªHARNESS CONNEC-
TORº.
+Be sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MI to light up due to the short circuit.
+Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MI to light up due to the malfunction of fuel injection system, etc.
+Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission Control Module) before returning the vehicle to the customer.
PRECAUTIONSQG
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
EC-16

SEF706Y
Engine Fuel & Emission Control System=NJEC0004+Always use a 12 volt battery as power source.
+Do not attempt to disconnect battery cables while engine
is running.
+Before connecting or disconnecting the ECM harness
connector, turn ignition switch OFF and disconnect nega-
tive battery terminal. Failure to do so may damage the
ECM because battery voltage is applied to ECM even if
ignition switch is turned off.
SEF707Y
+Do not disassemble ECM.
+If a battery terminal is disconnected, the memory will
return to the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is
disconnected. However, this is not an indication of a prob-
lem. Do not replace parts because of a slight variation.
SEF908W
+When connecting or disconnecting ECM harness
connector, use lever as shown.
When connecting, fasten connector securely with lever
moved until it stops.
SEF291H
+When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminals when connecting pin connectors.
+Securely connect ECM harness connectors.
A Poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.
+Keep ECM harness at least 10 cm (4 in) away from adja-
cent harness, to prevent an ECM system malfunctions due
to receiving external noise, degraded operation of ICs, etc.
+Keep ECM parts and harness dry.
PRECAUTIONSQG
Engine Fuel & Emission Control System
EC-17

MEF040D
+Handle mass air flow sensor carefully to avoid damage.
+Do not disassemble mass air flow sensor.
+Do not clean mass air flow sensor with any type of deter-
gent.
+Do not disassemble IAC valve-AAC valve.
+Even a slight leak in the air intake system can cause seri-
ous problems.
+Do not shock or jar the camshaft position sensor and
crankshaft position sensor.
+Before replacing ECM, perform refer to ªECM Terminals
and Reference Valueº inspection and make sure ECM
functions properly, EC-164.
SAT652J
+After performing each TROUBLE DIAGNOSIS, perform
ªDTC Confirmation Procedureº or ªOverall Function
Checkº.
The DTC should not be displayed in the ªDTC Confirma-
tion Procedureº if the repair is completed. The ªOverall
Function Checkº should be a good result if the repair is
completed.
SEF348N
+When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
+Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the
ECM's transistor. Use a ground other than ECM terminals,
such as the ground.
PRECAUTIONSQG
Engine Fuel & Emission Control System (Cont'd)
EC-18