Infiniti G20 (P11). Manual — part 148

Wiring Diagram . . . . . . . . . . . . . . 228
Diagnostic Procedure . . . . . . . . . . . ..229
Component Inspection. . . . . . . . . . . .230

DTC P0135 HEATED OXYGEN SENSOR 1
HEATER (FRONT). . . . . . . . . . . . . ...232

Description . . . . . . . . . . . . . . . ...232
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 232
ECM Terminals and Reference Value . . . . . .232
On Board Diagnosis Logic. . . . . . . . . ...232
DTC Confirmation Procedure . . . . . . . . ..233
Wiring Diagram . . . . . . . . . . . . . . 234
Diagnostic Procedure . . . . . . . . . . . ..235
Component Inspection. . . . . . . . . . . .236

DTC P0137 HEATED OXYGEN SENSOR 2
(REAR) (MIN. VOLTAGE MONITORING). . . . ...237

Component Description . . . . . . . . . . ...237
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 237
ECM Terminals and Reference Value . . . . . .237
On Board Diagnosis Logic. . . . . . . . . ...237
DTC Confirmation Procedure . . . . . . . . ..238
Overall Function Check . . . . . . . . . . ...238
Wiring Diagram . . . . . . . . . . . . . . 239
Diagnostic Procedure . . . . . . . . . . . ..240
Component Inspection. . . . . . . . . . . .243

DTC P0138 HEATED OXYGEN SENSOR 2
(REAR) (MAX. VOLTAGE MONITORING) . . . . .245

Component Description . . . . . . . . . . ...245
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 245
ECM Terminals and Reference Value . . . . . .245
On Board Diagnosis Logic. . . . . . . . . ...245
DTC Confirmation Procedure . . . . . . . . ..246
Overall Function Check . . . . . . . . . . ...246
Wiring Diagram . . . . . . . . . . . . . . 247
Diagnostic Procedure . . . . . . . . . . . ..248
Component Inspection. . . . . . . . . . . .251

DTC P0139 HEATED OXYGEN SENSOR 2
(REAR) (RESPONSE MONITORING). . . . . . .253

Component Description . . . . . . . . . . ...253
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 253
ECM Terminals and Reference Value . . . . . .253
On Board Diagnosis Logic. . . . . . . . . ...253
DTC Confirmation Procedure . . . . . . . . ..254
Overall Function Check . . . . . . . . . . ...254
Wiring Diagram . . . . . . . . . . . . . . 255
Diagnostic Procedure . . . . . . . . . . . ..256
Component Inspection. . . . . . . . . . . .259

DTC P0140 HEATED OXYGEN SENSOR 2
(REAR) (HIGH VOLTAGE) . . . . . . . . . . ..261

Component Description . . . . . . . . . . ...261
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 261
ECM Terminals and Reference Value . . . . . .261
On Board Diagnosis Logic. . . . . . . . . ...261
DTC Confirmation Procedure . . . . . . . . ..262
Overall Function Check . . . . . . . . . . ...262
Wiring Diagram . . . . . . . . . . . . . . 263
Diagnostic Procedure . . . . . . . . . . . ..264
Component Inspection. . . . . . . . . . . .265

DTC P0141 HEATED OXYGEN SENSOR 2
HEATER (REAR) . . . . . . . . . . . . . . .267

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
Wiring Diagram . . . . . . . . . . . . . . 269
Diagnostic Procedure . . . . . . . . . . . ..270
Component Inspection. . . . . . . . . . . .271

DTC P0171 FUEL INJECTION SYSTEM
FUNCTION (LEAN SIDE) . . . . . . . . . . . 272

On Board Diagnosis Logic. . . . . . . . . ...272
DTC Confirmation Procedure . . . . . . . . ..272
Wiring Diagram . . . . . . . . . . . . . . 274
Diagnostic Procedure . . . . . . . . . . . ..275

DTC P0172 FUEL INJECTION SYSTEM
FUNCTION (RICH SIDE) . . . . . . . . . . . .279

On Board Diagnosis Logic. . . . . . . . . ...279
DTC Confirmation Procedure . . . . . . . . ..279
Wiring Diagram . . . . . . . . . . . . . . 281
Diagnostic Procedure . . . . . . . . . . . ..282

DTC P0180 FUEL TANK TEMPERATURE
SENSOR . . . . . . . . . . . . . . . . . ..286

Component Description . . . . . . . . . . ...286
On Board Diagnosis Logic. . . . . . . . . ...286
DTC Confirmation Procedure . . . . . . . . ..286
Wiring Diagram . . . . . . . . . . . . . . 288
Diagnostic Procedure . . . . . . . . . . . ..289
Component Inspection. . . . . . . . . . . .290

DTC P0217 COOLANT OVERTEMPERATURE
ENRICHMENT PROTECTION. . . . . . . . . .291

System Description. . . . . . . . . . . . ..291
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 291
ECM Terminals and Reference Value . . . . . .292
On Board Diagnosis Logic. . . . . . . . . ...292
Possible Cause. . . . . . . . . . . . . . 292
Overall Function Check . . . . . . . . . . ...293
Wiring Diagram . . . . . . . . . . . . . . 296
Diagnostic Procedure (A/T Models) . . . . . . 298

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(Cont’d)

EC-3

Diagnostic Procedure (M/T Models). . . . . . 309
Main 12 Causes of Overheating. . . . . . . ..321

DTC P0300 - P0304 NO. 4 - 1 CYLINDER
MISFIRE, MULTIPLE CYLINDER MISFIRE . . . ...322

On Board Diagnosis Logic. . . . . . . . . ...322
DTC Confirmation Procedure . . . . . . . . ..322
Diagnostic Procedure . . . . . . . . . . . ..323
Component Inspection. . . . . . . . . . . .328

DTC P0325 KNOCK SENSOR (KS) . . . . . . ...329

Component Description . . . . . . . . . . ...329
ECM Terminals and Reference Value . . . . . .329
On Board Diagnosis Logic. . . . . . . . . ...329
DTC Confirmation Procedure . . . . . . . . ..329
Wiring Diagram . . . . . . . . . . . . . . 330
Diagnostic Procedure . . . . . . . . . . . ..331
Component Inspection. . . . . . . . . . . .332

DTC P0335 CRANKSHAFT POSITION SENSOR
(CKPS) (OBD). . . . . . . . . . . . . . . ..333

Component Description . . . . . . . . . . ...333
ECM Terminals and Reference Value . . . . . .333
On Board Diagnosis Logic. . . . . . . . . ...333
DTC Confirmation Procedure . . . . . . . . ..334
Wiring Diagram . . . . . . . . . . . . . . 335
Diagnostic Procedure . . . . . . . . . . . ..336
Component Inspection. . . . . . . . . . . .338

DTC P0340 CAMSHAFT POSITION SENSOR
(CMPS). . . . . . . . . . . . . . . . . . .339

Component Description . . . . . . . . . . ...339
ECM Terminals and Reference Value . . . . . .339
On Board Diagnosis Logic. . . . . . . . . ...340
DTC Confirmation Procedure . . . . . . . . ..340
Wiring Diagram . . . . . . . . . . . . . . 342
Diagnostic Procedure . . . . . . . . . . . ..343
Component Inspection. . . . . . . . . . . .346

DTC P0400 EGR FUNCTION (CLOSE). . . . . ..347

Description . . . . . . . . . . . . . . . ...347
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 348
ECM Terminals and Reference Value . . . . . .348
On Board Diagnosis Logic. . . . . . . . . ...348
Possible Cause. . . . . . . . . . . . . . 349
DTC Confirmation Procedure . . . . . . . . ..349
Wiring Diagram . . . . . . . . . . . . . . 351
Diagnostic Procedure . . . . . . . . . . . ..352

DTC P0403 EGR VOLUME CONTROL VALVE
(CIRCUIT). . . . . . . . . . . . . . . . . .357

Description . . . . . . . . . . . . . . . ...357
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 358
ECM Terminals and Reference Value . . . . . .358
On Board Diagnosis Logic. . . . . . . . . ...358
Possible Cause. . . . . . . . . . . . . . 359

DTC Confirmation Procedure . . . . . . . . ..359
Wiring Diagram . . . . . . . . . . . . . . 360
Diagnostic Procedure . . . . . . . . . . . ..361

DTC P0420 THREE WAY CATALYST FUNCTION ...364

On Board Diagnosis Logic. . . . . . . . . ...364
DTC Confirmation Procedure . . . . . . . . ..364
Overall Function Check . . . . . . . . . . ...365
Diagnostic Procedure . . . . . . . . . . . ..365

DTC P0440 EVAP CONTROL SYSTEM (SMALL
LEAK) (NEGATIVE PRESSURE). . . . . . . . 368

On Board Diagnosis Logic. . . . . . . . . ...368
Possible Cause. . . . . . . . . . . . . . 368
DTC Confirmation Procedure . . . . . . . . ..369
Diagnostic Procedure . . . . . . . . . . . ..370

DTC P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE (CIRCUIT). . . . .382

Description . . . . . . . . . . . . . . . ...382
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 382
ECM Terminals and Reference Value . . . . . .383
On Board Diagnosis Logic. . . . . . . . . ...383
Possible Cause. . . . . . . . . . . . . . 383
DTC Confirmation Procedure . . . . . . . . ..384
Wiring Diagram . . . . . . . . . . . . . . 385
Diagnostic Procedure . . . . . . . . . . . ..386

DTC P0446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CIRCUIT) . ..389

Component Description . . . . . . . . . . ...389
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 389
ECM Terminals and Reference Value . . . . . .389
On Board Diagnosis Logic. . . . . . . . . ...389
Possible Cause. . . . . . . . . . . . . . 390
DTC Confirmation Procedure . . . . . . . . ..390
Wiring Diagram . . . . . . . . . . . . . . 391
Diagnostic Procedure . . . . . . . . . . . ..392

DTC P0450 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PRESSURE SENSOR . . . ..396

Component Description . . . . . . . . . . ...396
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 396
ECM Terminals and Reference Value . . . . . .396
On Board Diagnosis Logic. . . . . . . . . ...397
Possible Cause. . . . . . . . . . . . . . 397
DTC Confirmation Procedure . . . . . . . . ..397
Wiring Diagram . . . . . . . . . . . . . . 399
Diagnostic Procedure . . . . . . . . . . . ..400

DTC P0455 EVAP CONTROL SYSTEM (GROSS
LEAK). . . . . . . . . . . . . . . . . . ...409

On Board Diagnosis Logic. . . . . . . . . ...409
Possible Cause. . . . . . . . . . . . . . 409
DTC Confirmation Procedure . . . . . . . . ..410

CONTENTS

(Cont’d)

EC-4

Diagnostic Procedure . . . . . . . . . . . .. 411

DTC P0460 FUEL LEVEL SENSOR FUNCTION
(SLOSH). . . . . . . . . . . . . . . . . ...420

Component Description . . . . . . . . . . ...420
ECM Terminals and Reference Value . . . . . .420
On Board Diagnostic Logic. . . . . . . . . ..420
Possible Cause. . . . . . . . . . . . . . 420
DTC Confirmation Procedure . . . . . . . . ..421
Wiring Diagram . . . . . . . . . . . . . . 422
Diagnostic Procedure . . . . . . . . . . . ..423

DTC P0461 FUEL LEVEL SENSOR FUNCTION . ...425

Component Description . . . . . . . . . . ...425
On Board Diagnostic Logic. . . . . . . . . ..425
Possible Cause. . . . . . . . . . . . . . 425
Overall Function Check . . . . . . . . . . ...425

DTC P0464 FUEL LEVEL SENSOR CIRCUIT . . ...427

Component Description . . . . . . . . . . ...427
ECM Terminals and Reference Value . . . . . .427
On Board Diagnostic Logic. . . . . . . . . ..427
Possible Cause. . . . . . . . . . . . . . 427
DTC Confirmation Procedure . . . . . . . . ..428
Wiring Diagram . . . . . . . . . . . . . . 429
Diagnostic Procedure . . . . . . . . . . . ..430

DTC P0500 VEHICLE SPEED SENSOR (VSS) . . .432

Component Description . . . . . . . . . . ...432
ECM Terminals and Reference Value . . . . . .432
On Board Diagnosis Logic. . . . . . . . . ...432
DTC Confirmation Procedure . . . . . . . . ..432
Overall Function Check . . . . . . . . . . ...433
Wiring Diagram . . . . . . . . . . . . . . 434
Diagnostic Procedure . . . . . . . . . . . ..435

DTC P0505 IDLE AIR CONTROL VALVE (IACV) -
AUXILIARY AIR CONTROL (AAC) VALVE . . . ...436

Description . . . . . . . . . . . . . . . ...436
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 437
ECM Terminals and Reference Value . . . . . .437
On Board Diagnosis Logic. . . . . . . . . ...437
DTC Confirmation Procedure . . . . . . . . ..437
Wiring Diagram . . . . . . . . . . . . . . 439
Diagnostic Procedure . . . . . . . . . . . ..440

DTC P0510 CLOSED THROTTLE POSITION
SWITCH . . . . . . . . . . . . . . . . . ...445

Component Description . . . . . . . . . . ...445
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 445
ECM Terminals and Reference Value . . . . . .445
On Board Diagnosis Logic. . . . . . . . . ...445
DTC Confirmation Procedure . . . . . . . . ..446
Overall Function Check . . . . . . . . . . ...446
Wiring Diagram . . . . . . . . . . . . . . 447
Diagnostic Procedure . . . . . . . . . . . ..448

DTC P0600 A/T CONTROL. . . . . . . . . . .453

System Description. . . . . . . . . . . . ..453
ECM Terminals and Reference Value . . . . . .453
On Board Diagnosis Logic. . . . . . . . . ...453
DTC Confirmation Procedure . . . . . . . . ..453
Wiring Diagram . . . . . . . . . . . . . . 454
Diagnostic Procedure . . . . . . . . . . . ..455

DTC P0605 ECM . . . . . . . . . . . . . . .456

Component Description . . . . . . . . . . ...456
On Board Diagnosis Logic. . . . . . . . . ...456
DTC Confirmation Procedure . . . . . . . . ..456
Diagnostic Procedure . . . . . . . . . . . ..457

DTC P1126 THERMOSTAT FUNCTION. . . . . .458

On Board Diagnosis Logic. . . . . . . . . ...458
Possible Cause. . . . . . . . . . . . . . 458
DTC Confirmation Procedure . . . . . . . . ..458
Diagnostic Procedure . . . . . . . . . . . ..459

DTC P1148 CLOSED LOOP CONTROL . . . . . 460

On Board Diagnosis Logic. . . . . . . . . ...460
DTC Confirmation Procedure . . . . . . . . ..460
Overall Function Check . . . . . . . . . . ...461
Diagnostic Procedure . . . . . . . . . . . ..461

DTC P1217 ENGINE OVER TEMPERATURE
(OVERHEAT) . . . . . . . . . . . . . . . ...462

System Description. . . . . . . . . . . . ..462
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 462
ECM Terminals and Reference Value . . . . . .463
On Board Diagnosis Logic. . . . . . . . . ...463
Overall Function Check . . . . . . . . . . ...464
Wiring Diagram . . . . . . . . . . . . . . 465
Diagnostic Procedure (A/T Models) . . . . . . 467
Diagnostic Procedure (M/T Models). . . . . . 478
Main 12 Causes of Overheating. . . . . . . ..490

DTC P1336 CRANKSHAFT POSITION SENSOR
(CKPS) (OBD) (COG). . . . . . . . . . . . ..491

Component Description . . . . . . . . . . ...491
ECM Terminals and Reference Value . . . . . .491
On Board Diagnosis Logic. . . . . . . . . ...491
DTC Confirmation Procedure . . . . . . . . ..492
Wiring Diagram . . . . . . . . . . . . . . 493
Diagnostic Procedure . . . . . . . . . . . ..494
Component Inspection. . . . . . . . . . . .496

DTC P1401 EGR TEMPERATURE SENSOR. . . .497

Component Description . . . . . . . . . . ...497
On Board Diagnosis Logic. . . . . . . . . ...497
Possible Cause. . . . . . . . . . . . . . 497
DTC Confirmation Procedure . . . . . . . . ..498
Wiring Diagram . . . . . . . . . . . . . . 500
Diagnostic Procedure . . . . . . . . . . . ..501

DTC P1402 EGR FUNCTION (OPEN) . . . . . . 505

Description . . . . . . . . . . . . . . . ...505

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CONTENTS

(Cont’d)

EC-5

CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 506
ECM Terminals and Reference Value . . . . . .506
On Board Diagnosis Logic. . . . . . . . . ...506
Possible Cause. . . . . . . . . . . . . . 507
DTC Confirmation Procedure . . . . . . . . ..507
Wiring Diagram . . . . . . . . . . . . . . 509
Diagnostic Procedure . . . . . . . . . . . ..510

DTC P1440 EVAP CONTROL SYSTEM (SMALL
LEAK) (POSITIVE PRESSURE) . . . . . . . . .515

On Board Diagnosis Logic. . . . . . . . . ...515
Possible Cause. . . . . . . . . . . . . . 515
DTC Confirmation Procedure . . . . . . . . ..516
Diagnostic Procedure . . . . . . . . . . . ..516

DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE. . . . . . . . ...517

Description . . . . . . . . . . . . . . . ...517
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 517
ECM Terminals and Reference Value . . . . . .518
On Board Diagnosis Logic. . . . . . . . . ...518
Possible Cause. . . . . . . . . . . . . . 518
DTC Confirmation Procedure . . . . . . . . ..519
Wiring Diagram . . . . . . . . . . . . . . 520
Diagnostic Procedure . . . . . . . . . . . ..521

DTC P1446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CLOSE). . .529

Component Description . . . . . . . . . . ...529
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 529
ECM Terminals and Reference Value . . . . . .529
On Board Diagnosis Logic. . . . . . . . . ...529
Possible Cause. . . . . . . . . . . . . . 530
DTC Confirmation Procedure . . . . . . . . ..530
Wiring Diagram . . . . . . . . . . . . . . 531
Diagnostic Procedure . . . . . . . . . . . ..532

DTC P1447 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PURGE FLOW
MONITORING . . . . . . . . . . . . . . . ..537

System Description. . . . . . . . . . . . ..537
On Board Diagnosis Logic. . . . . . . . . ...537
Possible Cause. . . . . . . . . . . . . . 537
DTC Confirmation Procedure . . . . . . . . ..538
Overall Function Check . . . . . . . . . . ...538
Diagnostic Procedure . . . . . . . . . . . ..540

DTC P1448 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (OPEN). . ...549

Component Description . . . . . . . . . . ...549
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 549
ECM Terminals and Reference Value . . . . . .549
On Board Diagnosis Logic. . . . . . . . . ...549

Possible Cause. . . . . . . . . . . . . . 550
DTC Confirmation Procedure . . . . . . . . ..550
Overall Function Check . . . . . . . . . . ...551
Wiring Diagram . . . . . . . . . . . . . . 552
Diagnostic Procedure . . . . . . . . . . . ..553

DTC P1464 FUEL LEVEL SENSOR CIRCUIT
(GROUND SIGNAL) . . . . . . . . . . . . . 558

Component Description . . . . . . . . . . ...558
ECM Terminals and Reference Value . . . . . .558
On Board Diagnostic Logic. . . . . . . . . ..558
Possible Cause. . . . . . . . . . . . . . 558
DTC Confirmation Procedure . . . . . . . . ..559
Wiring Diagram . . . . . . . . . . . . . . 560
Diagnostic Procedure . . . . . . . . . . . ..561

DTC P1490 VACUUM CUT VALVE BYPASS
VALVE (CIRCUIT). . . . . . . . . . . . . . 562

Description . . . . . . . . . . . . . . . ...562
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 562
ECM Terminals and Reference Value . . . . . .562
On Board Diagnosis Logic. . . . . . . . . ...563
Possible Cause. . . . . . . . . . . . . . 563
DTC Confirmation Procedure . . . . . . . . ..563
Wiring Diagram . . . . . . . . . . . . . . 564
Diagnostic Procedure . . . . . . . . . . . ..565

DTC P1491 VACUUM CUT VALVE BYPASS
VALVE. . . . . . . . . . . . . . . . . . ..568

Description . . . . . . . . . . . . . . . ...568
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 568
ECM Terminals and Reference Value . . . . . .568
On Board Diagnosis Logic. . . . . . . . . ...569
Possible Cause. . . . . . . . . . . . . . 569
DTC Confirmation Procedure . . . . . . . . ..569
Overall Function Check . . . . . . . . . . ...570
Wiring Diagram . . . . . . . . . . . . . . 571
Diagnostic Procedure . . . . . . . . . . . ..572

DTC P1605 A/T DIAGNOSIS COMMUNICATION
LINE . . . . . . . . . . . . . . . . . . . .580

System Description. . . . . . . . . . . . ..580
ECM Terminals and Reference Value . . . . . .580
On Board Diagnosis Logic. . . . . . . . . ...580
DTC Confirmation Procedure . . . . . . . . ..580
Wiring Diagram . . . . . . . . . . . . . . 581
Diagnostic Procedure . . . . . . . . . . . ..582

DTC P1706 PARK/NEUTRAL POSITION (PNP)
SWITCH . . . . . . . . . . . . . . . . . ...583

Component Description . . . . . . . . . . ...583
CONSULT-II Reference Value in Data Monitor
Mode . . . . . . . . . . . . . . . . . . 583
ECM Terminals and Reference Value . . . . . .583
On Board Diagnosis Logic. . . . . . . . . ...583

CONTENTS

(Cont’d)

EC-6