Nissan Pathfinder 2001 User Manual

ENGINE CONTROL SYSTEM

SECTION

MODIFICATION NOTICE:

I The SMART C/U - PREVIOUS is applicable for the 2WD models up to serial number 567231 and for the

4WD models up to serial number 584967.

I The SMART C/U - NEW is applicable for the 2WD models from serial number 567231 and for the 4WD

models from serial number 584967.

CONTENTS

TROUBLE DIAGNOSIS - INDEX ....................................8

Alphabetical & P No. Index for DTC ...........................8

PRECAUTIONS .............................................................14

Supplemental Restraint System (SRS) ″AIR

BAG″ and ″SEAT BELT PRE-TENSIONER″.............14

Precautions for On Board Diagnostic (OBD)

System of Engine and A/T.........................................14

Engine Fuel & Emission Control System ..................15

Precautions................................................................16

Wiring Diagrams and Trouble Diagnosis...................17

PREPARATION .............................................................18

Special Service Tools................................................18

Commercial Service Tools.........................................18

ENGINE AND EMISSION CONTROL OVERALL

SYSTEM.........................................................................20

Engine Control Component Parts Location...............20

Circuit Diagram..........................................................24

System Diagram ........................................................26

Vacuum Hose Drawing..............................................27

System Chart.............................................................28

ENGINE AND EMISSION BASIC CONTROL

SYSTEM DESCRIPTION...............................................29

Multiport Fuel Injection (MFI) System .......................29

Electronic Ignition (EI) System ..................................31

Air Conditioning Cut Control......................................32

Fuel Cut Control (at no load & high engine

speed)........................................................................33

Evaporative Emission System...................................33

Positive Crankcase Ventilation..................................39

BASIC SERVICE PROCEDURE...................................40

Fuel Pressure Release..............................................40

Fuel Pressure Check.................................................40

Fuel Pressure Regulator Check ................................41

Injector.......................................................................42

How to Check Idle Speed and Ignition Timing..........43

Idle Speed/Ignition Timing/Idle Mixture Ratio

Adjustment.................................................................44

Idle Air Volume Learning ...........................................59

ON BOARD DIAGNOSTIC SYSTEM

DESCRIPTION...............................................................61

Introduction................................................................61

Two Trip Detection Logic...........................................61

Emission-related Diagnostic Information...................62

Malfunction Indicator Lamp (MIL)..............................76

OBD System Operation Chart...................................77

CONSULT-II...............................................................83

Generic Scan Tool (GST)..........................................97

TROUBLE DIAGNOSIS - INTRODUCTION..................99

Introduction................................................................99

Work Flow................................................................101

TROUBLE DIAGNOSIS - BASIC INSPECTION.........103

Basic Inspection.......................................................103

TROUBLE DIAGNOSIS - GENERAL

DESCRIPTION.............................................................116

DTC Inspection Priority Chart..................................116

Fail-safe Chart .........................................................117

Symptom Matrix Chart.............................................118

CONSULT-II Reference Value in Data Monitor

Mode........................................................................122

Major Sensor Reference Graph in Data Monitor

Mode........................................................................124

ECM Terminals and Reference Value.....................127

TROUBLE DIAGNOSIS - SPECIFICATION VALUE ..136

Description...............................................................136

Testing Condition.....................................................136

Inspection Procedure...............................................136

Diagnostic Procedure ..............................................137

TROUBLE DIAGNOSIS FOR INTERMITTENT

INCIDENT.....................................................................140

Description...............................................................140

Diagnostic Procedure ..............................................140

IDX

CONTENTS (Cont’d)

TROUBLE DIAGNOSIS FOR POWER SUPPLY........141

ECM Terminals and Reference Value.....................141

Main Power Supply and Ground Circuit..................142

DTC P0100 MASS AIR FLOW SENSOR (MAFS)......150

Component Description ...........................................150

CONSULT-II Reference Value in Data Monitor

Mode........................................................................150

ECM Terminals and Reference Value.....................150

On Board Diagnosis Logic.......................................151

Possible Cause........................................................151

DTC Confirmation Procedure..................................151

Overall Function Check...........................................153

Wiring Diagram........................................................154

Diagnostic Procedure ..............................................155

DTC P0105 ABSOLUTE PRESSURE SENSOR ........158

Component Description ...........................................158

On Board Diagnosis Logic.......................................158

DTC Confirmation Procedure..................................158

Diagnostic Procedure ..............................................159

DTC P0110 INTAKE AIR TEMPERATURE

SENSOR ......................................................................160

Component Description ...........................................160

On Board Diagnosis Logic.......................................160

Possible Cause........................................................160

DTC Confirmation Procedure..................................160

Wiring Diagram........................................................162

Diagnostic Procedure ..............................................163

DTC P0115 ENGINE COOLANT TEMPERATURE

SENSOR (ECTS) (CIRCUIT).......................................165

Component Description ...........................................165

On Board Diagnosis Logic.......................................165

Possible Cause........................................................166

DTC Confirmation Procedure..................................166

Wiring Diagram........................................................167

Diagnostic Procedure ..............................................168

DTC P0120 THROTTLE POSITION SENSOR ...........170

Description...............................................................170

CONSULT-II Reference Value in Data Monitor

Mode........................................................................170

ECM Terminals and Reference Value.....................171

On Board Diagnosis Logic.......................................171

Possible Cause........................................................171

DTC Confirmation Procedure..................................172

Wiring Diagram........................................................176

Diagnostic Procedure ..............................................177

DTC P0125 ENGINE COOLANT TEMPERATURE

SENSOR (ECTS) .........................................................182

Description...............................................................182

On Board Diagnosis Logic.......................................182

Possible Cause........................................................183

DTC Confirmation Procedure..................................183

Wiring Diagram........................................................184

Diagnostic Procedure ..............................................185

DTC P0130, P0150 HEATED OXYGEN SENSOR 1

(FRONT) (BANK 1)/(BANK 2) (CIRCUIT) ..................187

Component Description ...........................................187

CONSULT-II Reference Value in Data Monitor

Mode........................................................................187

ECM Terminals and Reference Value.....................187

On Board Diagnosis Logic.......................................188

Possible Cause........................................................188

DTC Confirmation Procedure..................................189

Overall Function Check...........................................189

Wiring Diagram........................................................191

Diagnostic Procedure ..............................................193

DTC P0131, P0151 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2) (LEAN SHIFT

MONITORING).............................................................197

Component Description ...........................................197

CONSULT-II Reference Value in Data Monitor

Mode........................................................................197

ECM Terminals and Reference Value.....................197

On Board Diagnosis Logic.......................................198

Possible Cause........................................................198

DTC Confirmation Procedure..................................198

Overall Function Check...........................................199

Diagnostic Procedure ..............................................200

DTC P0132, P0152 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2) (RICH SHIFT

MONITORING).............................................................205

Component Description ...........................................205

CONSULT-II Reference Value in Data Monitor

Mode........................................................................205

ECM Terminals and Reference Value.....................205

On Board Diagnosis Logic.......................................206

Possible Cause........................................................206

DTC Confirmation Procedure..................................206

Overall Function Check...........................................207

Diagnostic Procedure ..............................................208

DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2) (RESPONSE

MONITORING).............................................................213

Component Description ...........................................213

CONSULT-II Reference Value in Data Monitor

Mode........................................................................213

ECM Terminals and Reference Value.....................213

On Board Diagnosis Logic.......................................214

Possible Cause........................................................214

DTC Confirmation Procedure..................................215

Overall Function Check...........................................216

Wiring Diagram........................................................217

Diagnostic Procedure ..............................................219

DTC P0134, P0154 HEATED OXYGEN SENSOR 1

(FRONT) (BANK 1)/(BANK 2) (HIGH VOLTAGE)......226

EC-2

CONTENTS (Cont’d)

Component Description ...........................................226

CONSULT-II Reference Value in Data Monitor

Mode........................................................................226

ECM Terminals and Reference Value.....................226

On Board Diagnosis Logic.......................................227

Possible Cause........................................................227

DTC Confirmation Procedure..................................227

Wiring Diagram........................................................229

Diagnostic Procedure ..............................................231

DTC P0135, P0155 HEATED OXYGEN SENSOR 1

HEATER (FRONT) (BANK 1)/(BANK 2).....................235

Description...............................................................235

CONSULT-II Reference Value in Data Monitor

Mode........................................................................235

ECM Terminals and Reference Value.....................235

On Board Diagnosis Logic.......................................236

Possible Cause........................................................236

DTC Confirmation Procedure..................................236

Wiring Diagram........................................................237

Diagnostic Procedure ..............................................239

DTC P0137, P0157 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2) (MIN. VOLTAGE

MONITORING).............................................................242

Component Description ...........................................242

CONSULT-II Reference Value in Data Monitor

Mode........................................................................242

ECM Terminals and Reference Value.....................242

On Board Diagnosis Logic.......................................242

Possible Cause........................................................243

DTC Confirmation Procedure..................................243

Overall Function Check...........................................243

Wiring Diagram........................................................245

Diagnostic Procedure ..............................................247

DTC P0138, P0158 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2) (MAX. VOLTAGE

MONITORING).............................................................252

Component Description ...........................................252

CONSULT-II Reference Value in Data Monitor

Mode........................................................................252

ECM Terminals and Reference Value.....................252

On Board Diagnosis Logic.......................................252

Possible Cause........................................................253

DTC Confirmation Procedure..................................253

Overall Function Check...........................................253

Wiring Diagram........................................................255

Diagnostic Procedure ..............................................257

DTC P0139, P0159 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2) (RESPONSE

MONITORING).............................................................262

Component Description ...........................................262

CONSULT-II Reference Value in Data Monitor

Mode........................................................................262

ECM Terminals and Reference Value.....................262

On Board Diagnosis Logic.......................................262

Possible Cause........................................................263

DTC Confirmation Procedure..................................263

Overall Function Check...........................................263

Wiring Diagram........................................................265

Diagnostic Procedure ..............................................267

DTC P0140, P0160 HEATED OXYGEN SENSOR 2

(REAR) (BANK 1)/(BANK 2) (HIGH VOLTAGE)........272

Component Description ...........................................272

CONSULT-II Reference Value in Data Monitor

Mode........................................................................272

ECM Terminals and Reference Value.....................272

On Board Diagnosis Logic.......................................272

Possible Cause........................................................273

DTC Confirmation Procedure..................................273

Overall Function Check...........................................273

Wiring Diagram........................................................275

Diagnostic Procedure ..............................................277

DTC P0141, P0161 HEATED OXYGEN SENSOR 2

HEATER (REAR) (BANK 1)/(BANK 2).......................281

Description...............................................................281

CONSULT-II Reference Value in Data Monitor

Mode........................................................................281

ECM Terminals and Reference Value.....................281

On Board Diagnosis Logic.......................................282

Possible Cause........................................................282

DTC Confirmation Procedure..................................282

Wiring Diagram........................................................284

Diagnostic Procedure ..............................................286

DTC P0171 (RIGHT, -B1), P0174 (LEFT, -B2)

FUEL INJECTION SYSTEM FUNCTION (LEAN).......289

On Board Diagnosis Logic.......................................289

Possible Cause........................................................289

DTC Confirmation Procedure..................................289

Wiring Diagram........................................................291

Diagnostic Procedure ..............................................293

DTC P0172 (RIGHT, -B1), P0175 (LEFT, -B2)

FUEL INJECTION SYSTEM FUNCTION (RICH)........297

On Board Diagnosis Logic.......................................297

Possible Cause........................................................297

DTC Confirmation Procedure..................................297

Wiring Diagram........................................................299

Diagnostic Procedure ..............................................301

DTC P0180 FUEL TANK TEMPERATURE

SENSOR ......................................................................304

Component Description ...........................................304

On Board Diagnosis Logic.......................................304

Possible Cause........................................................304

DTC Confirmation Procedure..................................305

Wiring Diagram........................................................306

Diagnostic Procedure ..............................................307

EC-3

IDX

CONTENTS (Cont’d)

DTC P0217 COOLANT OVERTEMPERATURE

ENRICHMENT PROTECTION.....................................309

On Board Diagnosis Logic.......................................309

Possible Cause........................................................309

Overall Function Check...........................................309

Diagnostic Procedure ..............................................311

Main 12 Causes of Overheating..............................314

DTC P0300 - P0306 NO.6-1CYLINDER

MISFIRE, MULTIPLE CYLINDER MISFIRE ...............315

On Board Diagnosis Logic.......................................315

Possible Cause........................................................315

DTC Confirmation Procedure..................................316

Diagnostic Procedure ..............................................316

DTC P0325 KNOCK SENSOR (KS)...........................323

Component Description ...........................................323

ECM Terminals and Reference Value.....................323

On Board Diagnosis Logic.......................................323

Possible Cause........................................................323

DTC Confirmation Procedure..................................323

Wiring Diagram........................................................325

Diagnostic Procedure ..............................................326

DTC P0335 CRANKSHAFT POSITION SENSOR

(CKPS) (POS)..............................................................329

Component Description ...........................................329

CONSULT-II Reference Value in Data Monitor

Mode........................................................................329

ECM Terminals and Reference Value.....................330

On Board Diagnosis Logic.......................................330

Possible Cause........................................................330

DTC Confirmation Procedure..................................331

Wiring Diagram........................................................332

Diagnostic Procedure ..............................................333

DTC P0340 CAMSHAFT POSITION SENSOR

(CMPS) (PHASE).........................................................337

Component Description ...........................................337

ECM Terminals and Reference Value.....................337

On Board Diagnosis Logic.......................................337

Possible Cause........................................................338

DTC Confirmation Procedure..................................338

Wiring Diagram........................................................339

Diagnostic Procedure ..............................................340

DTC P0420 (RIGHT BANK, -B1), P0430 (LEFT BANK, -B2) THREE WAY CATALYST FUNCTION...342

On Board Diagnosis Logic.......................................342

Possible Cause........................................................342

DTC Confirmation Procedure..................................343

Overall Function Check...........................................343

Diagnostic Procedure ..............................................344

DTC P0440 EVAP CONTROL SYSTEM (SMALL

LEAK) (NEGATIVE PRESSURE)................................347

On Board Diagnosis Logic.......................................347

Possible Cause........................................................347

DTC Confirmation Procedure..................................349

Diagnostic Procedure ..............................................350

DTC P0443 EVAP CANISTER PURGE VOLUME

CONTROL SOLENOID VALVE (CIRCUIT).................362

Description...............................................................362

CONSULT-II Reference Value in Data Monitor

Mode........................................................................362

ECM Terminals and Reference Value.....................363

On Board Diagnosis Logic.......................................363

Possible Cause........................................................363

DTC Confirmation Procedure..................................364

Wiring Diagram........................................................365

Diagnostic Procedure ..............................................366

DTC P0446 EVAPORATIVE EMISSION (EVAP)

CANISTER VENT CONTROL VALVE (CIRCUIT) ......369

Component Description ...........................................369

CONSULT-II Reference Value in Data Monitor

Mode........................................................................369

ECM Terminals and Reference Value.....................369

On Board Diagnosis Logic.......................................369

Possible Cause........................................................370

DTC Confirmation Procedure..................................370

Wiring Diagram........................................................371

Diagnostic Procedure ..............................................372

DTC P0450 EVAPORATIVE EMISSION (EVAP)

CONTROL SYSTEM PRESSURE SENSOR ..............376

Component Description ...........................................376

CONSULT-II Reference Value in Data Monitor

Mode........................................................................376

ECM Terminals and Reference Value.....................376

On Board Diagnosis Logic.......................................377

Possible Cause........................................................377

DTC Confirmation Procedure..................................377

Wiring Diagram........................................................379

Diagnostic Procedure ..............................................380

DTC P0455 EVAP CONTROL SYSTEM (GROSS

LEAK)...........................................................................389

On Board Diagnosis Logic.......................................389

Possible Cause........................................................389

DTC Confirmation Procedure..................................391

Diagnostic Procedure ..............................................392

DTC P0460 FUEL LEVEL SENSOR FUNCTION

(SLOSH).......................................................................402

Component Description ...........................................402

On Board Diagnostic Logic......................................402

Possible Cause........................................................402

DTC Confirmation Procedure..................................402

Wiring Diagram........................................................403

Diagnostic Procedure ..............................................404

DTC P0461 FUEL LEVEL SENSOR FUNCTION.......406

Component Description ...........................................406

On Board Diagnostic Logic......................................406

EC-4

CONTENTS (Cont’d)

Possible Cause........................................................406

Overall Function Check...........................................406

DTC P0464 FUEL LEVEL SENSOR CIRCUIT...........408

Component Description ...........................................408

On Board Diagnostic Logic......................................408

Possible Cause........................................................408

DTC Confirmation Procedure..................................408

Wiring Diagram........................................................409

Diagnostic Procedure ..............................................410

DTC P0500 VEHICLE SPEED SENSOR (VSS) .........412

Component Description ...........................................412

ECM Terminals and Reference Value.....................412

On Board Diagnosis Logic.......................................412

Possible Cause........................................................413

DTC Confirmation Procedure..................................413

Overall Function Check...........................................414

Wiring Diagram........................................................415

Diagnostic Procedure ..............................................416

DTC P0505 IDLE AIR CONTROL VALVE (IACV) -

AUXILIARY AIR CONTROL (AAC) VALVE ...............417

Description...............................................................417

CONSULT-II Reference Value in Data Monitor

Mode........................................................................418

ECM Terminals and Reference Value.....................418

On Board Diagnosis Logic.......................................418

Possible Cause........................................................418

DTC Confirmation Procedure..................................418

Wiring Diagram........................................................420

Diagnostic Procedure ..............................................421

DTC P0510 CLOSED THROTTLE POSITION

SWITCH .......................................................................426

Component Description ...........................................426

CONSULT-II Reference Value in Data Monitor

Mode........................................................................426

ECM Terminals and Reference Value.....................426

On Board Diagnosis Logic.......................................426

Possible Cause........................................................426

DTC Confirmation Procedure..................................427

Overall Function Check...........................................427

Wiring Diagram........................................................429

Diagnostic Procedure ..............................................430

DTC P0600 A/T COMMUNICATION LINE..................434

System Description..................................................434

ECM Terminals and Reference Value.....................434

On Board Diagnosis Logic.......................................434

Possible Cause........................................................434

DTC Confirmation Procedure..................................434

Wiring Diagram........................................................436

Diagnostic Procedure ..............................................437

DTC P0605 ECM .........................................................438

Component Description ...........................................438

On Board Diagnosis Logic.......................................438

Possible Cause........................................................438

DTC Confirmation Procedure..................................438

Diagnostic Procedure ..............................................439

DTC P1110 (RIGHT, -B1), P1135 (LEFT, -B2)

INTAKE VALVE TIMING CONTROL ..........................440

Description...............................................................440

CONSULT-II Reference Value in Data Monitor

Mode........................................................................440

ECM Terminals and Reference Value.....................441

On Board Diagnosis Logic.......................................442

Possible Cause........................................................442

DTC Confirmation Procedure..................................443

DTC P1111 (RIGHT, -B1), P1136 (LEFT, -B2) INTAKE VALVE TIMING CONTROL SOLENOID

VALVE (CIRCUIT)........................................................445

Component Description ...........................................445

CONSULT-II Reference Value in Data Monitor

Mode........................................................................445

ECM Terminals and Reference Value.....................445

On Board Diagnosis Logic.......................................446

Possible Cause........................................................446

DTC Confirmation Procedure..................................446

Wiring Diagram........................................................447

Diagnostic Procedure ..............................................449

DTC P1130 SWIRL CONTROL VALVE CONTROL

SOLENOID VALVE......................................................452

Description...............................................................452

CONSULT-II Reference Value in Data Monitor

Mode........................................................................453

ECM Terminals and Reference Value.....................453

On Board Diagnosis Logic.......................................453

Possible Cause........................................................454

DTC Confirmation Procedure..................................454

Wiring Diagram........................................................456

Diagnostic Procedure ..............................................457

DTC P1140 (RIGHT, -B1), P1145 (LEFT, -B2) INTAKE VALVE TIMING CONTROL POSITION

SENSOR (CIRCUIT) ....................................................475

Component Description ...........................................475

CONSULT-II Reference Value in Data Monitor

Mode........................................................................475

ECM Terminals and Reference Value.....................476

On Board Diagnosis Logic.......................................476

Possible Cause........................................................477

DTC Confirmation Procedure..................................477

Wiring Diagram........................................................478

Diagnostic Procedure ..............................................480

DTC P1148 (RIGHT BANK, -B1), P1168 (LEFT

BANK, -B2) CLOSED LOOP CONTROL ...................484

On Board Diagnosis Logic.......................................484

Possible Cause........................................................484

DTC Confirmation Procedure..................................484

EC-5

IDX

CONTENTS (Cont’d)

Overall Function Check...........................................485

Diagnostic Procedure ..............................................485

DTC P1165 SWIRL CONTROL VALVE CONTROL

VACUUM CHECK SWITCH.........................................486

Component Description ...........................................486

CONSULT-II Reference Value in Data Monitor

Mode........................................................................486

ECM Terminals and Reference Value.....................486

On Board Diagnosis Logic.......................................487

Possible Cause........................................................487

DTC Confirmation Procedure..................................487

Wiring Diagram........................................................488

Diagnostic Procedure ..............................................489

DTC P1320 IGNITION SIGNAL...................................492

Component Description ...........................................492

ECM Terminals and Reference Value.....................492

On Board Diagnosis Logic.......................................492

Possible Cause........................................................493

DTC Confirmation Procedure..................................493

Wiring Diagram........................................................494

Diagnostic Procedure ..............................................497

DTC P1335 CRANKSHAFT POSITION SENSOR

(CKPS) (REF) ..............................................................503

Component Description ...........................................503

CONSULT-II Reference Value in Data Monitor

Mode........................................................................503

ECM Terminals and Reference Value.....................503

On Board Diagnosis Logic.......................................504

Possible Cause........................................................504

DTC Confirmation Procedure..................................504

Wiring Diagram........................................................506

Diagnostic Procedure ..............................................507

DTC P1336 CRANKSHAFT POSITION SENSOR

(CKPS) (POS) (COG)..................................................510

Component Description ...........................................510

CONSULT-II Reference Value in Data Monitor

Mode........................................................................510

ECM Terminals and Reference Value.....................511

On Board Diagnosis Logic.......................................511

Possible Cause........................................................511

DTC Confirmation Procedure..................................512

Wiring Diagram........................................................513

Diagnostic Procedure ..............................................514

DTC P1441 EVAP CONTROL SYSTEM (VERY

SMALL LEAK).............................................................519

On Board Diagnosis Logic.......................................519

Possible Cause........................................................519

DTC Confirmation Procedure..................................520

Diagnostic Procedure ..............................................522

DTC P1444 EVAP CANISTER PURGE VOLUME

CONTROL SOLENOID VALVE...................................534

Description...............................................................534

CONSULT-II Reference Value in Data Monitor

Mode........................................................................534

ECM Terminals and Reference Value.....................535

On Board Diagnosis Logic.......................................535

Possible Cause........................................................535

DTC Confirmation Procedure..................................536

Wiring Diagram........................................................537

Diagnostic Procedure ..............................................538

DTC P1446 EVAPORATIVE EMISSION (EVAP)

CANISTER VENT CONTROL VALVE (CLOSE).........546

Component Description ...........................................546

CONSULT-II Reference Value in Data Monitor

Mode........................................................................546

ECM Terminals and Reference Value.....................546

On Board Diagnosis Logic.......................................546

Possible Cause........................................................547

DTC Confirmation Procedure..................................547

Wiring Diagram........................................................548

Diagnostic Procedure ..............................................549

DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE FLOW

MONITORING..............................................................554

System Description..................................................554

On Board Diagnosis Logic.......................................554

Possible Cause........................................................554

DTC Confirmation Procedure..................................555

Overall Function Check...........................................556

Diagnostic Procedure ..............................................557

DTC P1448 EVAPORATIVE EMISSION (EVAP)

CANISTER VENT CONTROL VALVE (OPEN)...........565

Component Description ...........................................565

CONSULT-II Reference Value in Data Monitor

Mode........................................................................565

ECM Terminals and Reference Value.....................565

On Board Diagnosis Logic.......................................565

Possible Cause........................................................566

DTC Confirmation Procedure..................................566

Overall Function Check...........................................567

Wiring Diagram........................................................568

Diagnostic Procedure ..............................................569

DTC P1464 FUEL LEVEL SENSOR CIRCUIT

(GROUND SIGNAL) ....................................................574

Component Description ...........................................574

On Board Diagnostic Logic......................................574

Possible Cause........................................................574

DTC Confirmation Procedure..................................574

Wiring Diagram........................................................575

Diagnostic Procedure ..............................................576

DTC P1490 VACUUM CUT VALVE BYPASS

VALVE (CIRCUIT)........................................................577

Description...............................................................577

EC-6

CONTENTS (Cont’d)

CONSULT-II Reference Value in Data Monitor

Mode........................................................................577

ECM Terminals and Reference Value.....................577

On Board Diagnosis Logic.......................................578

Possible Cause........................................................578

DTC Confirmation Procedure..................................578

Wiring Diagram........................................................579

Diagnostic Procedure ..............................................580

DTC P1491 VACUUM CUT VALVE BYPASS

VALVE..........................................................................583

Description...............................................................583

CONSULT-II Reference Value in Data Monitor

Mode........................................................................583

ECM Terminals and Reference Value.....................583

On Board Diagnosis Logic.......................................584

Possible Cause........................................................584

DTC Confirmation Procedure..................................584

Overall Function Check...........................................585

Wiring Diagram........................................................586

Diagnostic Procedure ..............................................587

DTC P1605 A/T DIAGNOSIS COMMUNICATION

LINE .............................................................................595

Component Description ...........................................595

On Board Diagnosis Logic.......................................595

Possible Cause........................................................595

DTC Confirmation Procedure..................................595

DTC P1706 PARK/NEUTRAL POSITION (PNP)

SWITCH .......................................................................596

Component Description ...........................................596

CONSULT-II Reference Value in Data Monitor

Mode........................................................................596

ECM Terminals and Reference Value.....................596

On Board Diagnosis Logic.......................................596

Possible Cause........................................................596

DTC Confirmation Procedure..................................597

Overall Function Check...........................................598

Wiring Diagram........................................................599

Diagnostic Procedure ..............................................600

VARIABLE INDUCTION AIR CONTROL SYSTEM

(VIAS)...........................................................................603

Description...............................................................603

ECM Terminals and Reference Value.....................604

Wiring Diagram........................................................605

Diagnostic Procedure ..............................................606

INJECTOR ...................................................................609

Component Description ...........................................609

CONSULT-II Reference Value in Data Monitor

Mode........................................................................609

ECM Terminals and Reference Value.....................609

Wiring Diagram........................................................610

Diagnostic Procedure ..............................................611

START SIGNAL...........................................................614

CONSULT-II Reference Value in Data Monitor

Mode........................................................................614

ECM Terminals and Reference Value.....................614

Wiring Diagram........................................................615

Diagnostic Procedure ..............................................616

FUEL PUMP.................................................................618

System Description..................................................618

Component Description ...........................................618

CONSULT-II Reference Value in Data Monitor

Mode........................................................................618

ECM Terminals and Reference Value.....................619

Wiring Diagram........................................................620

Diagnostic Procedure ..............................................621

POWER STEERING OIL PRESSURE SWITCH.........627

Component Description ...........................................627

CONSULT-II Reference Value in Data Monitor

Mode........................................................................627

ECM Terminals and Reference Value.....................627

Wiring Diagram........................................................628

Diagnostic Procedure ..............................................629

REFRIGERANT PRESSURE SENSOR......................632

Description...............................................................632

ECM Terminals and Reference Value.....................632

Wiring Diagram........................................................633

Diagnostic Procedure ..............................................634

ELECTRICAL LOAD SIGNAL.....................................636

ECM Terminals and Reference Value.....................636

Wiring Diagram........................................................637

Diagnostic Procedure ..............................................639

MIL & DATA LINK CONNECTORS ............................642

Wiring Diagram........................................................642

SERVICE DATA AND SPECIFICATIONS (SDS).......643

Fuel Pressure Regulator..........................................643

Idle Speed and Ignition Timing................................643

Mass Air Flow Sensor..............................................643

Engine Coolant Temperature Sensor......................643

Heated Oxygen Sensor 1 Heater (front) .................643

Fuel Pump ...............................................................643

IACV-AAC Valve......................................................643

Injector.....................................................................643

Resistor....................................................................643

Throttle Position Sensor..........................................644

Calculated Load Value.............................................644

Intake Air Temperature Sensor................................644

Heated Oxygen Sensor 2 Heater (rear)..................644

Crankshaft Position Sensor (REF) ..........................644

Fuel Tank Temperature Sensor ...............................644

Camshaft Position Sensor (PHASE) .......................644

EC-7

IDX

Alphabetical & P No. Index for DTC

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC

ALPHABETICAL INDEX FOR DTC

Items

(CONSULT-II screen terms) Unable to access ECM — EC-117 ABSL PRES SEN/CIRC P0105 EC-158 AIR TEMP SEN/CIRC P0110 EC-160 A/T 1ST GR FNCTN P0731 AT-120 A/T 2ND GR FNCTN P0732 AT-126 A/T 3RD GR FNCTN P0733 AT-132 A/T 4TH GR FNCTN P0734 AT-138 A/T COMM LINE P0600*2 EC-434 A/T DIAG COMM LINE P1605 EC-595 A/T TCC S/V FNCTN P0744 AT-153 ATF TEMP SEN/CIRC P0710 AT-105 CAM PS/CIRC (PHS) P0340 EC-337 CLOSED LOOP-B1 P1148 EC-484

DTC*1 Reference page

NAEC0001

NAEC0001S01

CLOSED LOOP-B2 P1168 EC-484 CLOSED TP SW/CIRC P0510 EC-426 COOLANT T SEN/CIRC*3 P0115 EC-165 *COOLANT T SEN/CIRC P0125 EC-182 CPS/CIRC (POS) COG P1336 EC-510 CPS/CIRCUIT (POS) P0335 EC-329 CPS/CIRCUIT (REF) P1335 EC-503 CYL 1 MISFIRE P0301 EC-315 CYL 2 MISFIRE P0302 EC-315 CYL 3 MISFIRE P0303 EC-315 CYL 4 MISFIRE P0304 EC-315 CYL 5 MISFIRE P0305 EC-315 CYL 6 MISFIRE P0306 EC-315 ECM P0605 EC-438 ENGINE SPEED SIG P0725 AT-116 ENG OVER TEMP P0217 EC-309 ENG OVER TEMP P1217 LC-25 EVAP GROSS LEAK P0455 EC-389 EVAP PURG FLOW/MON P1447 EC-554 EVAP SYS PRES SEN P0450 EC-376 EVAP SMALL LEAK P0440 EC-347 EVAP VERY SMALL LEAK P1441 EC-519

EC-8

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC (Cont’d)

Items

(CONSULT-II screen terms) FUEL LEVL SEN/CIRC P0464 EC-408 FUEL LEVL SEN/CIRC P1464 EC-574 FUEL LEVEL SENSOR P0461 EC-406 FUEL LV SE (SLOSH) P0460 EC-402 FUEL SYS-LEAN/BK1 P0171 EC-289 FUEL SYS-LEAN/BK2 P0174 EC-289 FUEL SYS-RICH/BK1 P0172 EC-297 FUEL SYS-RICH/BK2 P0175 EC-297 FUEL TEMP SEN/CIRC P0180 EC-304 HO2S1 HTR (B1) P0135 EC-235 HO2S1 HTR (B2) P0155 EC-235 HO2S1 (B1) P0130 EC-187 HO2S1 (B1) P0131 EC-197 HO2S1 (B1) P0132 EC-205 HO2S1 (B1) P0133 EC-213

DTC*1 Reference page

HO2S1 (B1) P0134 EC-226 HO2S1 (B2) P0150 EC-187 HO2S1 (B2) P0151 EC-197 HO2S1 (B2) P0152 EC-205 HO2S1 (B2) P0153 EC-213 HO2S1 (B2) P0154 EC-226 HO2S2 (B1) P0137 EC-242 HO2S2 (B1) P0138 EC-252 HO2S2 (B1) P0139 EC-262 HO2S2 (B1) P0140 EC-272 HO2S2 (B2) P0157 EC-242 HO2S2 (B2) P0158 EC-252 HO2S2 (B2) P0159 EC-262 HO2S2 (B2) P0160 EC-272 HO2S2 HTR (B1) P0141 EC-281 HO2S2 HTR (B2) P0161 EC-281 IACV/AAC VLV/CIRC P0505 EC-417

IGN SIGNAL-PRIMARY P1320 EC-492 INTK TIM S/CIRC-B1 P1140 EC-475 INTK TIM S/CIRC-B2 P1145 EC-475 INT/V TIM CONT-B1 P1110 EC-440 INT/V TIM CONT-B2 P1135 EC-440

EC-9

IDX

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC (Cont’d)

Items

(CONSULT-II screen terms) INT/V TIM V/CIR-B1 P1111 EC-445 INT/V TIM V/CIR-B2 P1136 EC-445 KNOCK SEN/CIRC-B1 P0325*2 EC-323 L/PRES SOL/CIRC P0745 AT-162 MAF SEN/CIRCUIT*3 P0100 EC-150 MULTI CYL MISFIRE P0300 EC-315 NATS MALFUNCTION P1610 - P1615*2 EL-328

NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.

O/R CLTCH SOL/CIRC P1760 AT-185 P-N POS SW/CIRCUIT P1706 EC-596 PNP SW/CIRC P0705 AT-99 PURG VOLUME CONT/V P0443 EC-362 PURG VOLUME CONT/V P1444 EC-534 SFT SOL A/CIRC*3 P0750 AT-168

DTC*1 Reference page

P0000 —

SFT SOL B/CIRC*3 P0755 AT-172 SWIRL CONT SOL/V P1130 EC-452 SWL CON VC SW/CIRC P1165 EC-486 TCC SOLENOID/CIRC P0740 AT-148 TP SEN/CIRC A/T*3 P1705 AT-176 TRTL POS SEN/CIRC*3 P0120 EC-170 TW CATALYST SYS-B1 P0420 EC-342 TW CATALYST SYS-B2 P0430 EC-342 VC CUT/V BYPASS/V P1491 EC-583 VC/V BYPASS/V P1490 EC-577 VEH SPEED SEN/CIRC*4 P0500 EC-412 VEH SPD SEN/CIR A/T*4 P0720 AT-111 VENT CONTROL VALVE P0446 EC-369 VENT CONTROL VALVE P1446 EC-546 VENT CONTROL VALVE P1448 EC-565

*1: 1st trip DTC No. is the same as DTC No. *2: This DTC is displayed with CONSULT-II only. *3: When the fail-safe operation occurs, the MIL illuminates. *4: The MIL illuminates when both the “Revolution sensor signal” and the “Vehicle speed sensor signal” meet the fail-safe condition at

the same time.

NOTE:

I Regarding R50 models, “-B1” and “BK1” indicate right bank and “-B2” and “BK2” indicate left bank. I Bank 1 (-B1 or BK1) includes No. 1 cylinder.

EC-10

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC (Cont’d)

P NO. INDEX FOR DTC

DTC*1

— Unable to access ECM EC-117

P0000

P0100 MAF SEN/CIRCUIT*3 EC-150 P0105 ABSL PRES SEN/CIRC EC-158

P0110 AIR TEMP SEN/CIRC EC-160

P0115 COOLANT T SEN/CIRC*3 EC-165 P0120 THRTL POS SEN/CIRC*3 EC-170 P0125 *COOLANT T SEN/CIRC EC-182 P0130 HO2S1 (B1) EC-187 P0131 HO2S1 (B1) EC-197 P0132 HO2S1 (B1) EC-205 P0133 HO2S1 (B1) EC-213 P0134 HO2S1 (B1) EC-226

(CONSULT-II screen terms)

NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.

Items

Reference page

—

=NAEC0001S02

P0135 HO2S1 HTR (B1) EC-235 P0137 HO2S2 (B1) EC-242 P0138 HO2S2 (B1) EC-252 P0139 HO2S2 (B1) EC-262 P0140 HO2S2 (B1) EC-272 P0141 HO2S2 HTR (B1) EC-281 P0150 HO2S1 (B2) EC-187 P0151 HO2S1 (B2) EC-197 P0152 HO2S1 (B2) EC-205 P0153 HO2S1 (B2) EC-213 P0154 HO2S1 (B2) EC-226 P0155 HO2S1 HTR (B2) EC-235 P0157 HO2S2 (B2) EC-242 P0158 HO2S2 (B2) EC-252 P0159 HO2S2 (B2) EC-262 P0160 HO2S2 (B2) EC-272 P0161 HO2S2 HTR (B2) EC-281

P0171 FUEL SYS-LEAN/BK1 EC-289 P0172 FUEL SYS-RICH/BK1 EC-297 P0174 FUEL SYS-LEAN/BK2 EC-289 P0175 FUEL SYS-RICH/BK2 EC-297 P0180 FUEL TEMP SEN/CIRC EC-304

EC-11

IDX

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC (Cont’d)

DTC*1

P0217 ENG OVER TEMP EC-309 P0300 MULTI CYL MISFIRE EC-315 P0301 CYL 1 MISFIRE EC-315 P0302 CYL 2 MISFIRE EC-315 P0303 CYL 3 MISFIRE EC-315 P0304 CYL 4 MISFIRE EC-315 P0305 CYL 5 MISFIRE EC-315 P0306 CYL 6 MISFIRE EC-315

P0325*2 KNOCK SEN/CIRC-B1 EC-323

P0335 CPS/CIRCUIT (POS) EC-329 P0340 CAM PS/CIRC (PHS) EC-337 P0420 TW CATALYST SYS-B1 EC-342 P0430 TW CATALYST SYS-B2 EC-342 P0440 EVAP SMALL LEAK EC-347 P0443 PURG VOLUME CONT/V EC-362

(CONSULT-II screen terms)

Items

Reference page

P0446 VENT CONTROL VALVE EC-369 P0450 EVAP SYS PRES SEN EC-376 P0455 EVAP GROSS LEAK EC-389 P0460 FUEL LV SE (SLOSH) EC-402 P0461 FUEL LEVEL SENSOR EC-406 P0464 FUEL LEVL SEN/CIRC EC-408 P0500 VEH SPEED SEN/CIRC*4 EC-412 P0505 IACV/AAC VLV/CIRC EC-417 P0510 CLOSED TP SW/CIRC EC-426

P0600*2 A/T COMM LINE EC-434

P0605 ECM EC-438 P0705 PNP SW/CIRC AT-99 P0710 ATF TEMP SEN/CIRC AT-105 P0720 VEH SPD SEN/CIR A/T*4 AT-111 P0725 ENGINE SPEED SIG AT-116 P0731 A/T 1ST GR FNCTN AT-120 P0732 A/T 2ND GR FNCTN AT-126 P0733 A/T 3RD GR FNCTN AT-132 P0734 A/T 4TH GR FNCTN AT-138 P0740 TCC SOLENOID/CIRC AT-148 P0744 A/T TCC S/V FNCTN AT-153 P0745 L/PRESS SOL/CIRC AT-162

EC-12

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC (Cont’d)

DTC*1

P0750 SFT SOL A/CIRC*3 AT-168 P0755 SFT SOL B/CIRC*3 AT-172

P1110 INT/V TIM CONT-B1 EC-440

P1111 INT/V TIM V/CIR-B1 EC-445

P1130 SWIRL CONT SOL/V EC-452

P1135 INT/V TIM CONT-B2 EC-440

P1136 INT/V TIM V/CIR-B2 EC-445

P1140 INTK TIM S/CIRC-B1 EC-475

P1145 INTK TIM S/CIRC-B2 EC-475

P1148 CLOSED LOOP-B1 EC-484

P1165 SWL CON VC SW/CIRC EC-486

P1168 CLOSED LOOP-B2 EC-484 P1217 ENG OVER TEMP LC-25 P1320 IGN SIGNAL-PRIMARY EC-492 P1335 CPS/CIRCUIT (REF) EC-503

(CONSULT-II screen terms)

Items

Reference page

P1336 CPS/CIRC (POS) COG EC-510 P1441 EVAP VERY SMALL LEAK EC-519 P1444 PURG VOLUME CONT/V EC-534 P1446 VENT CONTROL VALVE EC-546 P1447 EVAP PURG FLOW/MON EC-554 P1448 VENT CONTROL VALVE EC-565 P1464 FUEL LEVEL SEN/CIRC EC-574 P1490 VC/V BYPASS/V EC-577 P1491 VC CUT/V BYPASS/V EC-583 P1605 A/T DIAG COMM LINE EC-595

P1610 - P1615*2 NATS MALFUNCTION EL-328

P1705 TP SEN/CIRC A/T*3 AT-176 P1706 P-N POS SW/CIRCUIT EC-596 P1760 O/R CLTCH SOL/CIRC AT-185

the same time.

NOTE:

I Regarding R50 models, “-B1” and “BK1” indicate right bank and “-B2” and “BK2” indicate left bank. I Bank 1 (-B1 or BK1) includes No. 1 cylinder.

EC-13

IDX

PRECAUTIONS

Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” 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 R50 is as follows:

I For a frontal collision

The Supplemental Restraint System consists of driver air bag module (located in the center of the steering wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.

I For a side collision

The Supplemental Restraint System consists of side air bag module (located in the outer side of front seat), satellite sensor, diagnosis 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 the RS section of this Service Manual.

WARNING:

I 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 must be performed by an authorized NISSAN dealer.

I 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, refer to RS section.

I Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified with yellow harness connector (and with yellow harness protector or yellow insulation tape before the harness connectors).

NAEC0002

Precautions for On Board Diagnostic (OBD) System of Engine and A/T

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the driver of a malfunction causing emission deterioration.

CAUTION:

I Be sure to turn the ignition switch OFF 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 MIL to light up.

I Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will

cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)

I 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-9, “HARNESS CONNECTOR (SLIDE-LOCKING TYPE)”.

I Be sure to route and secure the harnesses properly after work. The interference of the harness with

a bracket, etc. may cause the MIL to light up due to the short circuit.

I Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube

may cause the MIL to light up due to the malfunction of the fuel injection system, etc.

I 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.

NAEC0003

EC-14

PRECAUTIONS

Engine Fuel & Emission Control System

NAEC0004

EC-15

SEF952RE

IDX

Precautions

PRECAUTIONS

SEF289H

SEF908W

Precautions

NAEC0005

I Before connecting or disconnecting the ECM harness

connector, turn ignition switch OFF and disconnect negative battery terminal. Failure to do so may damage the ECM because battery voltage is applied to ECM even if ignition switch is turned off.

I When connecting ECM harness connector, fasten it

securely with a lever as far as it will go as shown at left.

I 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 terminal, when connecting pin connectors.

SEF291H

MEF040D

SEF217U

I Before replacing ECM, perform “ECM Terminals and Ref-

erence Value” inspection and make sure ECM functions properly. Refer to EC-127.

I After performing each TROUBLE DIAGNOSIS, perform

“DTC Confirmation Procedure” or “Overall Function Check”. The DTC should not be displayed in the “DTC Confirmation Procedure” if the repair is completed. The “Overall Function Check” should be a good result if the repair is completed.

EC-16

PRECAUTIONS

Precautions (Cont’d)

SEF348N

I 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.

I 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 the ECM terminals, such as the ground.

I Regarding model R50, “-B1” indicates the right bank and

“-B2” indicates the left bank as shown in the figure.

I Bank 1 includes No. 1 cylinder.

SEF099WB

Wiring Diagrams and Trouble Diagnosis

When you read Wiring diagrams, refer to the following:

I GI-11, “HOW TO READ WIRING DIAGRAMS” I EL-12, “POWER SUPPLY ROUTING” for power distribution circuit

When you perform trouble diagnosis, refer to the following:

I GI-35, “HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES” I GI-24, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”

NAEC0006

EC-17

IDX

Special Service Tools

PREPARATION

Special Service Tools

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number (Kent-Moore No.) Tool name

KV10117100 (J36471-A) Front heated oxygen sensor wrench Rear heated oxygen sensor wrench

(J44321) Fuel pressure adapter and gauge kit

Description

Loosening or tightening front and rear heated oxygen sensors with 22 mm (0.87 in) hexagon nut

NT379

Checking fuel pressure with pressure gauge

SEF326Z

Commercial Service Tools

Tool name (Kent-Moore No.)

Description

NAEC0007

NAEC0008

Leak detector (J41416)

EVAP service port adapter (J41413-OBD)

Fuel filler cap adapter

Locating the EVAP leak

NT703

Applying positive pressure through EVAP service port

NT704

Checking fuel tank vacuum relief valve opening pressure

NT653

EC-18

PREPARATION

Commercial Service Tools (Cont’d)

Tool name (Kent-Moore No.)

Socket wrench

Oxygen sensor thread cleaner (J-43897-18) (J-43897-12)

Anti-seize lubricant (Per-

matex equivalent meeting MIL specification MIL-A-907)

133AR or

Description

NT705

NT828

Removing and installing engine coolant temperature sensor

Reconditioning the exhaust system threads before installing a new oxygen sensor. Use with antiseize lubricant shown below.

a: J-43897-18 18 mm diameter with pitch 1.5 mm, for Zirconia Oxygen Sensor b: J-43897-12 12 mm diameter with pitch 1.25 mm, for Titania Oxygen Sensor

Lubricating oxygen sensor thread cleaning tool when reconditioning exhaust system threads.

NT779

EC-19

IDX

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location

NAEC0009

EC-20

SEF952Z

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location (Cont’d)

EC-21

SEF034Z

IDX

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location (Cont’d)

EC-22

SEF584Z

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location (Cont’d)

EC-23

SEF036Z

IDX

Circuit Diagram

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Circuit Diagram

MODELS WITH SMART C/U — PREVIOUS

NAEC0010

NAEC0010S01

EC-24

MEC316D

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Circuit Diagram (Cont’d)

MODELS WITH SMART C/U — NEW

NAEC0010S02

EC-25

MEC391D

IDX

System Diagram

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

System Diagram

NAEC0011

EC-26

SEC306C

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Vacuum Hose Drawing

Refer to “System Diagram”, EC-26 for Vacuum Control System.

NAEC0012

EC-27

SEF953Z

IDX

System Chart

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Input (Sensor) ECM Function Output (Actuator)

I Camshaft position sensor (PHASE) I Crankshaft position sensor (REF) I Mass air flow sensor I Engine coolant temperature sensor I Heated oxygen sensor 1 (front) I Ignition switch I Throttle position sensor I Closed throttle position switch *3 I Park/neutral position (PNP) switch I Air conditioner switch I Knock sensor I Intake air temperature sensor I Absolute pressure sensor I EVAP control system pressure sensor *1 I Battery voltage I Power steering oil pressure switch I Vehicle speed sensor I Fuel tank temperature sensor *1 I Crankshaft position sensor (POS) I Heated oxygen sensor 2 (rear)*2 I TCM (Transmission control module) I Refrigerant pressure sensor I Electrical load I Fuel level sensor*1

System Chart

Fuel injection & mixture ratio control Injectors Electronic ignition system Power transistor Idle air control system IACV-AAC valve Fuel pump control Fuel pump relay On board diagnostic system MIL (On the instrument panel)

Swirl control valve control

Power valve control VIAS control solenoid valve Heated oxygen sensor 1 heater (front) con-

trol

Heated oxygen sensor 2 heater (rear) control

EVAP canister purge flow control

Air conditioning cut control Air conditioner relay

ON BOARD DIAGNOSIS for EVAP system

Swirl control valve control solenoid valve

Heated oxygen sensor 1 heater (front)

Heated oxygen sensor 2 heater (rear)

EVAP canister purge volume control solenoid valve

I EVAP canister vent control valve I Vacuum cut valve bypass valve

NAEC0013

*1: These sensors are not used to control the engine system. They are used only for the on board diagnosis. *2: This sensor is not used to control the engine system under normal conditions. *3: This switch will operate in place of the throttle position sensor to control EVAP parts if the sensor malfunctions.

EC-28

ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION

Multiport Fuel Injection (MFI) System

DESCRIPTION Input/Output Signal Chart

Sensor Input Signal to ECM

Crankshaft position sensor (POS) Engine speed (POS signal) Crankshaft position sensor (REF) Engine speed (REF signal) Camshaft position sensor (PHASE) Piston position Mass air flow sensor Amount of intake air Engine coolant temperature sensor Engine coolant temperature Heated oxygen sensor 1 (front) Density of oxygen in exhaust gas

Throttle position sensor

Park/neutral position (PNP) switch Gear position Vehicle speed sensor Vehicle speed Ignition switch Start signal Air conditioner switch Air conditioner operation Knock sensor Engine knocking condition

Throttle position Throttle valve idle position

ECM func-

tion

Fuel injection & mixture ratio control

Injectors

Actuator

NAEC0014

NAEC0014S01

Battery Battery voltage Absolute pressure sensor Ambient air barometric pressure Power steering oil pressure switch Power steering operation Heated oxygen sensor 2 (rear)* Density of oxygen in exhaust gas

*: Under normal conditions, this sensor is not for engine control operation.

Basic Multiport Fuel Injection System

NAEC0014S02

The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the ECM memory. The program value is preset by engine operating conditions. These conditions are determined by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air flow sensor.

Various Fuel Injection Increase/Decrease Compensation

NAEC0014S03

In addition, the amount of fuel injected is compensated to improve engine performance under various operating conditions as listed below.

I During warm-up I When starting the engine I During acceleration I Hot-engine operation I When selector lever is changed from “N” to “D” I High-load, high-speed operation

I During deceleration I During high engine speed operation

EC-29

IDX

ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION

Multiport Fuel Injection (MFI) System (Cont’d)

Mixture Ratio Feedback Control (Closed loop control)

NAEC0014S04

SEF336WA

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control. The warm-up three way catalyst can then better reduce CO, HC and NOx emissions. This system uses a heated oxygen sensor 1 (front) in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about the heated oxygen sensor 1 (front) , refer to EC-187. This maintains the mixture ratio within the range of stoichiometric (ideal air-fuel mixture). This stage is referred to as the closed loop control condition. Heated oxygen sensor 2 (rear) is located downstream of the warm-up three way catalyst. Even if the switching characteristics of the heated oxygen sensor 1 (front) shift, the air-fuel ratio is controlled to stoichiometric by the signal from the heated oxygen sensor 2 (rear).

Open Loop Control

NAEC0014S05

The open loop system condition refers to when the ECM detects any of the following conditions. Feedback control stops in order to maintain stabilized fuel combustion.

I Deceleration and acceleration I High-load, high-speed operation I Malfunction of heated oxygen sensor 1 (front) or its circuit I Insufficient activation of heated oxygen sensor 1 (front) at low engine coolant temperature I High engine coolant temperature I During warm-up I After shifting from “N” to “D” I When starting the engine

Mixture Ratio Self-learning Control

NAEC0014S06

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from the heated oxygen sensor 1 (front). This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes during operation (i.e., injector clogging) directly affect mixture ratio. Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is then computed in terms of “injection pulse duration” to automatically compensate for the difference between the two ratios. “Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim includes short term fuel trim and long term fuel trim. “Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical value. The signal from the heated oxygen sensor 1 (front) indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in fuel volume if it is lean. “Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences, wear over time and changes in the usage environment.

EC-30

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