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System Description .................................................34 Ground Inspection ...................................................90

ELECTRIC IGNITION SYSTEM .........................37

System Description .................................................37

AIR CONDITIONING CUT CONTROL ...............38Input/Output Signal Chart ........................................38System Description .................................................38

AUTOMATIC SPEED CONTROL DEVICE (ASCD) ...............................................................39

U0101 CAN COMM CIRCUIT ...........................91Description ...............................................................91On Board Diagnosis Logic .......................................91DTC Confirmation Procedure ..................................91Diagnosis Procedure ...............................................91

U0140 CAN COMM CIRCUIT ...........................92Description ...............................................................92On Board Diagnosis Logic .......................................92ENGINE

SECTION EC ECONTENTS

ENGINE CONTROL SYSTEM

QR25DE

BASIC INSPECTION ...................................14

DIAGNOSIS AND REPAIR WORK FLOW ........14Trouble Diagnosis Introduction ...............................14

INSPECTION AND ADJUSTMENT ....................19Basic Inspection ......................................................19Idle Speed and Ignition Timing Check ....................23Procedure After Replacing ECM .............................23VIN Registration ......................................................24Accelerator Pedal Released Position Learning .......24Throttle Valve Closed Position Learning .................24Idle Air Volume Learning .........................................24

FUNCTION DIAGNOSIS ..............................27

ENGINE CONTROL SYSTEM ............................27System Diagram ......................................................27Engine Control Component Parts Location .............28

MULTIPORT FUEL INJECTION SYSTEM .........34

INTAKE VALVE TIMING CONTROL ................45Description ...............................................................45

ON BOARD DIAGNOSTIC (OBD) SYSTEM ....46Introduction ..............................................................46Two Trip Detection Logic .........................................46Emission-related Diagnostic Information .................47Malfunction Indicator Lamp (MIL) ............................61OBD System Operation Chart .................................64CONSULT-III Function (ENGINE) ...........................69Generic Scan Tool (GST) Function .........................76

COMPONENT DIAGNOSIS .........................79

TROUBLE DIAGNOSIS - SPECIFICATION VALUE ...............................................................79

Description ...............................................................79Testing Condition .....................................................79Inspection Procedure ...............................................79Diagnosis Procedure ...............................................79

POWER SUPPLY AND GROUND CIRCUIT ....87Diagnosis Procedure ...............................................87EC-1

PSystem Description .................................................39Component Description ...........................................40

CAN COMMUNICATION ....................................41System Description .................................................41

EVAPORATIVE EMISSION SYSTEM ................42Description ..............................................................42

DTC Confirmation Procedure ..................................92Diagnosis Procedure ...............................................92

U1001 CAN COMM CIRCUIT ...........................93Description ...............................................................93On Board Diagnosis Logic .......................................93DTC Confirmation Procedure ..................................93Diagnosis Procedure ...............................................93

Revision: July 2009 2010 Frontier

P0011 IVT CONTROL ........................................ 94On Board Diagnosis Logic ...................................... 94DTC Confirmation Procedure ................................. 94Diagnosis Procedure .............................................. 95Component Inspection ............................................ 96

P0031, P0032 A/F SENSOR 1 HEATER ........... 97Description .............................................................. 97On Board Diagnosis Logic ...................................... 97DTC Confirmation Procedure ................................. 97Diagnosis Procedure .............................................. 97Component Inspection ............................................ 99

P0037, P0038 HO2S2 HEATER ...................... 100Description .............................................................100On Board Diagnosis Logic .....................................100DTC Confirmation Procedure ................................100Diagnosis Procedure .............................................101Component Inspection ...........................................102

P0075 IVT CONTROL SOLENOID VALVE ..... 103Component Description .........................................103On Board Diagnosis Logic .....................................103DTC Confirmation Procedure ................................103Diagnosis Procedure .............................................103Component Inspection ...........................................104

P0101 MAF SENSOR ...................................... 106Component Description .........................................106On Board Diagnosis Logic .....................................106DTC Confirmation Procedure ................................106Overall Function Check .........................................107Diagnosis Procedure .............................................108Component Inspection ...........................................110

P0102, P0103 MAF SENSOR .......................... 112Component Description .........................................112On Board Diagnosis Logic .....................................112DTC Confirmation Procedure ................................112Diagnosis Procedure .............................................113Component Inspection ...........................................114

P0112, P0113 IAT SENSOR ............................ 117Component Description .........................................117On Board Diagnosis Logic .....................................117DTC Confirmation Procedure ................................117Diagnosis Procedure .............................................117Component Inspection ...........................................119

P0116 ECT SENSOR ....................................... 120Component Description .........................................120On Board Diagnosis Logic .....................................120DTC Confirmation Procedure ................................120Diagnosis Procedure .............................................121Component Inspection ...........................................121

P0117, P0118 ECT SENSOR .......................... 123Component Description .........................................123On Board Diagnosis Logic .....................................123

Component Inspection .......................................... 125

P0122, P0123 TP SENSOR ..............................126Component Description ........................................ 126On Board Diagnosis Logic .................................... 126DTC Confirmation Procedure ................................ 126Diagnosis Procedure ............................................. 126Component Inspection .......................................... 129

P0125 ECT SENSOR .......................................130Component Description ........................................ 130On Board Diagnosis Logic .................................... 130DTC Confirmation Procedure ................................ 130Diagnosis Procedure ............................................. 131Component Inspection .......................................... 131

P0127 IAT SENSOR .........................................133Component Description ........................................ 133On Board Diagnosis Logic .................................... 133DTC Confirmation Procedure ................................ 133Diagnosis Procedure ............................................. 134Component Inspection .......................................... 134

P0128 THERMOSTAT FUNCTION ..................136On Board Diagnosis Logic .................................... 136DTC Confirmation Procedure ................................ 136Diagnosis Procedure ............................................. 136Component Inspection .......................................... 137

P0130 A/F SENSOR 1 ......................................138Component Description ........................................ 138On Board Diagnosis Logic .................................... 138DTC Confirmation Procedure ................................ 138Overall Function Check ......................................... 139Diagnosis Procedure ............................................. 139

P0131 A/F SENSOR 1 ......................................142Component Description ........................................ 142On Board Diagnosis Logic .................................... 142DTC Confirmation Procedure ................................ 142Diagnosis Procedure ............................................. 143



P0137 HO2S2 ...................................................153Component Description ........................................ 153On Board Diagnosis Logic .................................... 153DTC Confirmation Procedure ................................ 153Overall Function Check ......................................... 154EC-2

DTC Confirmation Procedure ................................124Diagnosis Procedure .............................................124

Diagnosis Procedure ............................................. 154Component Inspection .......................................... 156


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P0138 HO2S2 ................................................... 158Component Description ......................................... 158On Board Diagnosis Logic .................................... 158DTC Confirmation Procedure ................................ 159Overall Function Check ......................................... 159Diagnosis Procedure ............................................. 160Component Inspection .......................................... 163

P0139 HO2S2 ................................................... 164Component Description ......................................... 164On Board Diagnosis Logic .................................... 164DTC Confirmation Procedure ................................ 164Overall Function Check ......................................... 165Diagnosis Procedure ............................................. 165Component Inspection .......................................... 167

P0171 FUEL INJECTION SYSTEM FUNC-TION ................................................................. 169

On Board Diagnosis Logic .................................... 169DTC Confirmation Procedure ................................ 169Diagnosis Procedure ............................................. 170

P0172 FUEL INJECTION SYSTEM FUNC-TION ................................................................. 174


P0181 FTT SENSOR ........................................ 178Component Description ......................................... 178On Board Diagnosis Logic .................................... 178DTC Confirmation Procedure ................................ 178Diagnosis Procedure ............................................. 179Component Inspection .......................................... 180

P0182, P0183 FTT SENSOR ........................... 181Component Description ......................................... 181On Board Diagnosis Logic .................................... 181DTC Confirmation Procedure ................................ 181Diagnosis Procedure ............................................. 181Component Inspection .......................................... 183

P0222, P0223 TP SENSOR ............................. 184Component Description ......................................... 184On Board Diagnosis Logic .................................... 184DTC Confirmation Procedure ................................ 184Diagnosis Procedure ............................................. 184Component Inspection .......................................... 187

P0300, P0301, P0302, P0303, P0304 MIS-FIRE .................................................................. 188


P0327, P0328 KS ............................................. 194Component Description ......................................... 194On Board Diagnosis Logic .................................... 194DTC Confirmation Procedure ................................ 194

Component Inspection ...........................................196

P0335 CKP SENSOR (POS) ........................... 197Component Description .........................................197On Board Diagnosis Logic .....................................197DTC Confirmation Procedure ................................197Diagnosis Procedure .............................................198Component Inspection ...........................................199

P0340 CMP SENSOR (PHASE) ..................... 201Component Description .........................................201On Board Diagnosis Logic .....................................201DTC Confirmation Procedure ................................201Diagnosis Procedure .............................................202Component Inspection ...........................................204

P0420 THREE WAY CATALYST FUNCTION . 205On Board Diagnosis Logic .....................................205DTC Confirmation Procedure ................................205Overall Function Check .........................................206Diagnosis Procedure .............................................206

P0441 EVAP CONTROL SYSTEM ................. 209System Description ................................................209On Board Diagnosis Logic .....................................209DTC Confirmation Procedure ................................209Overall Function Check .........................................210Diagnosis Procedure .............................................210

P0442 EVAP CONTROL SYSTEM ................. 214On Board Diagnosis Logic .....................................214DTC Confirmation Procedure ................................215Diagnosis Procedure .............................................215Component Inspection ...........................................220

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE ...................... 221

Description .............................................................221On Board Diagnosis Logic .....................................221DTC Confirmation Procedure ................................221Diagnosis Procedure .............................................222Component Inspection ...........................................224

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE ...... 226


P0447 EVAP CANISTER VENT CONTROL VALVE ............................................................. 229

Component Description .........................................229On Board Diagnosis Logic .....................................229DTC Confirmation Procedure ................................229Diagnosis Procedure .............................................229Component Inspection ...........................................231EC-3

Diagnosis Procedure ............................................. 194 P0448 EVAP CANISTER VENT CONTROL VALVE ............................................................. 233


Component Description .........................................233On Board Diagnosis Logic .....................................233DTC Confirmation Procedure ................................233Diagnosis Procedure .............................................234Component Inspection ...........................................235

P0451 EVAP CONTROL SYSTEM PRES-SURE SENSOR ............................................... 237






P0455 EVAP CONTROL SYSTEM .................. 249On Board Diagnosis Logic .....................................249DTC Confirmation Procedure ................................249Diagnosis Procedure .............................................250Component Inspection ...........................................254

P0456 EVAP CONTROL SYSTEM .................. 256On Board Diagnosis Logic .....................................256DTC Confirmation Procedure ................................257Overall Function Check .........................................257Diagnosis Procedure .............................................258Component Inspection ...........................................262

P0460 FUEL LEVEL SENSOR ........................ 264Component Description .........................................264On Board Diagnosis Logic .....................................264DTC Confirmation Procedure ................................264Diagnosis Procedure .............................................264

P0461 FUEL LEVEL SENSOR ........................ 266Component Description .........................................266On Board Diagnosis Logic .....................................266Overall Function Check .........................................266Diagnosis Procedure .............................................267

P0462, P0463 FUEL LEVEL SENSOR ........... 268Component Description .........................................268On Board Diagnosis Logic .....................................268DTC Confirmation Procedure ................................268

P0500 VSS ........................................................270Description ............................................................ 270On Board Diagnosis Logic .................................... 270DTC Confirmation Procedure ................................ 270Overall Function Check ......................................... 271Diagnosis Procedure ............................................. 271

P0506 ISC SYSTEM .........................................272Description ............................................................ 272On Board Diagnosis Logic .................................... 272DTC Confirmation Procedure ................................ 272Diagnosis Procedure ............................................. 272

P0507 ISC SYSTEM .........................................274Description ............................................................ 274On Board Diagnosis Logic .................................... 274DTC Confirmation Procedure ................................ 274Diagnosis Procedure ............................................. 274

P0550 PSP SENSOR .......................................276Component Description ........................................ 276On Board Diagnosis Logic .................................... 276DTC Confirmation Procedure ................................ 276Diagnosis Procedure ............................................. 276Component Inspection .......................................... 278

P0603 ECM POWER SUPPLY .........................279Component Description ........................................ 279On Board Diagnosis Logic .................................... 279DTC Confirmation Procedure ................................ 279Diagnosis Procedure ............................................. 279

P0605 ECM .......................................................281Component Description ........................................ 281On Board Diagnosis Logic .................................... 281DTC Confirmation Procedure ................................ 281Diagnosis Procedure ............................................. 282

P0607 ECM .......................................................283Description ............................................................ 283On Board Diagnosis Logic .................................... 283DTC Confirmation Procedure ................................ 283Diagnosis Procedure ............................................. 283

P0643 SENSOR POWER SUPPLY ..................285On Board Diagnosis Logic .................................... 285DTC Confirmation Procedure ................................ 285Diagnosis Procedure ............................................. 285

P0850 PNP SWITCH ........................................288Component Description ........................................ 288On Board Diagnosis Logic .................................... 288DTC Confirmation Procedure ................................ 288Overall Function Check ......................................... 289Diagnosis Procedure ............................................. 289

P1148 CLOSED LOOP CONTROL ..................292On Board Diagnosis Logic .................................... 292

P1217 ENGINE OVER TEMPERATURE .........293EC-4

Diagnosis Procedure .............................................268 On Board Diagnosis Logic .................................... 293


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Overall Function Check ......................................... 293Diagnosis Procedure ............................................. 294Main 12 Causes of Overheating ............................ 295

P1225 TP SENSOR .......................................... 296Component Description ......................................... 296On Board Diagnosis Logic .................................... 296DTC Confirmation Procedure ................................ 296Diagnosis Procedure ............................................. 296


P1421 COLD START CONTROL ..................... 300Description ............................................................ 300On Board Diagnosis Logic .................................... 300DTC Confirmation Procedure ................................ 300Diagnosis Procedure ............................................. 300

P1550 BATTERY CURRENT SENSOR ........... 302Component Description ......................................... 302On Board Diagnosis Logic .................................... 302DTC Confirmation Procedure ................................ 302Diagnosis Procedure ............................................. 302Component Inspection .......................................... 304

P1551, P1552 BATTERY CURRENT SEN-SOR .................................................................. 306

Component Description ......................................... 306On Board Diagnosis Logic .................................... 306DTC Confirmation Procedure ................................ 306Diagnosis Procedure ............................................. 306Component Inspection .......................................... 308


P1554 BATTERY CURRENT SENSOR ........... 314Component Description ......................................... 314On Board Diagnosis Logic .................................... 314Overall Function Check ......................................... 314Diagnosis Procedure ............................................. 315Component Inspection .......................................... 316

P1564 ASCD STEERING SWITCH .................. 318Component Description ......................................... 318On Board Diagnosis Logic .................................... 318DTC Confirmation Procedure ................................ 318Diagnosis Procedure ............................................. 318Component Inspection .......................................... 320

P1572 ASCD BRAKE SWITCH ....................... 322

DTC Confirmation Procedure ................................322Diagnosis Procedure .............................................323Component Inspection ...........................................329

P1574 ASCD VEHICLE SPEED SENSOR ..... 331Component Description .........................................331On Board Diagnosis Logic .....................................331DTC Confirmation Procedure ................................331Diagnosis Procedure .............................................331

P1715 INPUT SPEED SENSOR ..................... 333Description .............................................................333On Board Diagnosis Logic .....................................333Diagnosis Procedure .............................................333

P1805 BRAKE SWITCH ................................. 334Description .............................................................334On Board Diagnosis Logic .....................................334DTC Confirmation Procedure ................................334Diagnosis Procedure .............................................334Component Inspection ...........................................336

P2100, P2103 THROTTLE CONTROL MO-TOR RELAY .................................................... 337

Component Description .........................................337On Board Diagnosis Logic .....................................337DTC Confirmation Procedure ................................337Diagnosis Procedure .............................................338

P2101 ELECTRIC THROTTLE CONTROL FUNCTION ...................................................... 340


P2118 THROTTLE CONTROL MOTOR ......... 344Component Description .........................................344On Board Diagnosis Logic .....................................344DTC Confirmation Procedure ................................344Diagnosis Procedure .............................................344Component Inspection ...........................................345

P2119 ELECTRIC THROTTLE CONTROL ACTUATOR ..................................................... 346


P2122, P2123 APP SENSOR ......................... 348Component Description .........................................348On Board Diagnosis Logic .....................................348DTC Confirmation Procedure ................................348Diagnosis Procedure .............................................349Component Inspection ...........................................350

P2127, P2128 APP SENSOR ......................... 351EC-5

Component Description ......................................... 322On Board Diagnosis Logic .................................... 322

Component Description .........................................351On Board Diagnosis Logic ...................................



P2135 TP SENSOR ......................................... 355Component Description .........................................355On Board Diagnosis Logic .....................................355DTC Confirmation Procedure ................................355Diagnosis Procedure .............................................355Component Inspection ...........................................358

P2138 APP SENSOR ...................................... 359Component Description .........................................359On Board Diagnosis Logic .....................................359DTC Confirmation Procedure ................................359Diagnosis Procedure .............................................360Component Inspection ...........................................362

P2A00 A/F SENSOR 1 .................................... 363Component Description .........................................363On Board Diagnosis Logic .....................................363DTC Confirmation Procedure ................................363Diagnosis Procedure .............................................364

ASCD BRAKE SWITCH .................................. 368Component Description .........................................368Diagnosis Procedure .............................................368Component Inspection ...........................................372

ASCD INDICATOR .......................................... 373Component Description .........................................373Diagnosis Procedure .............................................373

ELECTRICAL LOAD SIGNAL ......................... 374Description .............................................................374Diagnosis Procedure .............................................374

FUEL INJECTOR ............................................. 375Component Description .........................................375Diagnosis Procedure .............................................375Component Inspection ...........................................377

FUEL PUMP ..................................................... 378Description .............................................................378Diagnosis Procedure .............................................378Component Inspection ...........................................381

IGNITION SIGNAL ........................................... 382Component Description .........................................382Diagnosis Procedure .............................................382Component Inspection ...........................................385

ON BOARD REFUELING VAPOR RECOV-ERY (ORVR) .................................................... 387

System Description ................................................387Diagnosis Procedure .............................................387Component Inspection ...........................................389

POSITIVE CRANKCASE VENTILATION ........ 392Description .............................................................392

REFRIGERANT PRESSURE SENSOR ...........394Component Description ........................................ 394Diagnosis Procedure ............................................. 394

ECU DIAGNOSIS ......................................397

ECM ..................................................................397CONSULT-III Reference Value in Data Monitor Mode ..................................................................... 397ECM Harness Connector Terminal Layout ........... 399ECM Terminal and Reference Value .................... 400Wiring Diagram ..................................................... 406Fail-safe Chart ...................................................... 422DTC Inspection Priority Chart ............................... 424DTC Index ............................................................. 424Emission-related Diagnostic Information .............. 428

SYMPTOM DIAGNOSIS ...........................443

ENGINE CONTROL SYSTEM SYMPTOMS ....443Symptom Matrix Chart .......................................... 443

NORMAL OPERATING CONDITION ...............447Fuel Cut Control (at No Load and High Engine Speed) .................................................................. 447

PRECAUTION ...........................................448

PRECAUTIONS ................................................448Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-SIONER" ............................................................... 448On Board Diagnosis (OBD) System of Engine and A/T ........................................................................ 448Precaution ............................................................. 448

PREPARATION .........................................452

PREPARATION ................................................452Special Service Tool ............................................. 452Commercial Service Tool ...................................... 452

ON-VEHICLE MAINTENANCE .................454

FUEL PRESSURE ............................................454Fuel Pressure Check ............................................ 454

EVAP LEAK CHECK ........................................457How to Detect Fuel Vapor Leakage ...................... 457

ON-VEHICLE REPAIR ..............................459

EVAP CANISTER .............................................459Component Inspection .......................................... 459Removal and Installation ....................................... 459

SERVICE DATA AND SPECIFICATIONS (SDS) .........................................................460

SERVICE DATA AND SPECIFICATIONS EC-6

Component Inspection ...........................................392 (SDS) ................................................................460Fuel Pressure ........................................................ 460


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Idle Speed and Ignition Timing .............................. 460Calculated Load Value .......................................... 460Mass Air Flow Sensor ........................................... 460Intake Air Temperature Sensor ............................. 460Engine Coolant Temperature Sensor .................... 460Air Fuel Ratio (A/F) Sensor 1 Heater .................... 461Heated Oxygen sensor 2 Heater ........................... 461Crankshaft Position Sensor (POS) ........................ 461Camshaft Position Sensor (PHASE) ..................... 461Throttle Control Motor ........................................... 461Fuel Injector .......................................................... 461Fuel Pump ............................................................. 461

VQ40DE

BASIC INSPECTION ................................. 462

DIAGNOSIS AND REPAIR WORKFLOW ....... 462Trouble Diagnosis Introduction ............................. 462

INSPECTION AND ADJUSTMENT .................. 468Basic Inspection .................................................... 468Idle Speed and Ignition Timing Check .................. 472Procedure After Replacing ECM ........................... 472VIN Registration .................................................... 473Accelerator Pedal Released Position Learning ..... 473Throttle Valve Closed Position Learning ............... 473Idle Air Volume Learning ....................................... 473

FUNCTION DIAGNOSIS ............................ 476

ENGINE CONTROL SYSTEM .......................... 476System Diagram .................................................... 476Engine Control Component Parts Location ........... 477

MULTIPORT FUEL INJECTION SYSTEM ....... 484System Description ............................................... 484

ELECTRIC IGNITION SYSTEM ....................... 487System Description ............................................... 487

AIR CONDITIONING CUT CONTROL ............. 488Input/Output Signal Chart ...................................... 488System Description ............................................... 488

AUTOMATIC SPEED CONTROL DEVICE (ASCD) ............................................................. 489

System Description ............................................... 489Component Description ......................................... 490

CAN COMMUNICATION .................................. 491System Description ............................................... 491

COOLING FAN CONTROL .............................. 492Description ............................................................ 492

EVAPORATIVE EMISSION SYSTEM .............. 493Description ............................................................ 493

INTAKE VALVE TIMING CONTROL ............... 496Description ............................................................ 496

Description .............................................................497Vacuum Hose Drawing ..........................................499

ON BOARD DIAGNOSTIC (OBD) SYSTEM .. 500Introduction ............................................................500Two Trip Detection Logic .......................................500Emission-related Diagnostic Information ...............501Malfunction Indicator Lamp (MIL) ..........................520OBD System Operation Chart ...............................523CONSULT-III Function (ENGINE) .........................528Generic Scan Tool (GST) Function .......................536

COMPONENT DIAGNOSIS ....................... 538

TROUBLE DIAGNOSIS - SPECIFICATION VALUE ............................................................. 538

Description .............................................................538Testing Condition ...................................................538Inspection Procedure .............................................538Diagnosis Procedure .............................................538

POWER SUPPLY AND GROUND CIRCUIT .. 546Diagnosis Procedure .............................................546Ground Inspection .................................................549

U0101 CAN COMM CIRCUIT ......................... 550Description .............................................................550On Board Diagnosis Logic .....................................550DTC Confirmation Procedure ................................550Diagnosis Procedure .............................................550

U1001 CAN COMM CIRCUIT ......................... 551Description .............................................................551On Board Diagnosis Logic .....................................551DTC Confirmation Procedure ................................551Diagnosis Procedure .............................................551

P0011, P0021 IVT CONTROL ......................... 552On Board Diagnosis Logic .....................................552DTC Confirmation Procedure ................................552Diagnosis Procedure .............................................553Component Inspection ...........................................554

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER .......................................................... 555


P0037, P0038, P0057, P0058 HO2S2 HEAT-ER .................................................................... 558

Description .............................................................558On Board Diagnosis Logic .....................................558DTC Confirmation Procedure ................................558Diagnosis Procedure .............................................559Component Inspection ...........................................560EC-7VARIABLE INDUCTION AIR SYSTEM ............ 497

P0075, P0081 IVT CONTROL SOLENOID VALVE ............................................................. 562



P0101 MAF SENSOR ...................................... 565Component Description .........................................565On Board Diagnosis Logic .....................................565DTC Confirmation Procedure ................................565Overall Function Check .........................................566Diagnosis Procedure .............................................567Component Inspection ...........................................569

P0102, P0103 MAF SENSOR .......................... 571Component Description .........................................571On Board Diagnosis Logic .....................................571DTC Confirmation Procedure ................................571Diagnosis Procedure .............................................572Component Inspection ...........................................573

P0112, P0113 IAT SENSOR ............................ 576Component Description .........................................576On Board Diagnosis Logic .....................................576DTC Confirmation Procedure ................................576Diagnosis Procedure .............................................576Component Inspection ...........................................578


P0117, P0118 ECT SENSOR .......................... 582Component Description .........................................582On Board Diagnosis Logic .....................................582DTC Confirmation Procedure ................................583Diagnosis Procedure .............................................583Component Inspection ...........................................584

P0122, P0123 TP SENSOR ............................. 586Component Description .........................................586On Board Diagnosis Logic .....................................586DTC Confirmation Procedure ................................586Diagnosis Procedure .............................................586Component Inspection ...........................................589


P0127 IAT SENSOR ........................................ 593Component Description .........................................593On Board Diagnosis Logic .....................................593


P0128 THERMOSTAT FUNCTION ..................596On Board Diagnosis Logic .................................... 596DTC Confirmation Procedure ................................ 596Diagnosis Procedure ............................................. 596Component Inspection .......................................... 597

P0130, P0150 A/F SENSOR 1 .........................598Component Description ........................................ 598On Board Diagnosis Logic .................................... 598DTC Confirmation Procedure ................................ 598Overall Function Check ......................................... 599Diagnosis Procedure ............................................. 599

P0131, P0151 A/F SENSOR 1 .........................602Component Description ........................................ 602On Board Diagnosis Logic .................................... 602DTC Confirmation Procedure ................................ 602Diagnosis Procedure ............................................. 603



P0137, P0157 HO2S2 .......................................615Component Description ........................................ 615On Board Diagnosis Logic .................................... 615DTC Confirmation Procedure ................................ 615Overall Function Check ......................................... 616Diagnosis Procedure ............................................. 616Component Inspection .......................................... 619



P0171, P0174 FUEL INJECTION SYSTEM FUNCTION ........................................................635EC-8


On Board Diagnosis Logic .................................... 635DTC Confirmation Procedure ................................ 635


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Diagnosis Procedure ............................................. 636

P0172, P0175 FUEL INJECTION SYSTEM FUNCTION ....................................................... 641


P0181 FTT SENSOR ........................................ 647Component Description ......................................... 647On Board Diagnosis Logic .................................... 647DTC Confirmation Procedure ................................ 647Diagnosis Procedure ............................................. 648Component Inspection .......................................... 649

P0182, P0183 FTT SENSOR ........................... 650Component Description ......................................... 650On Board Diagnosis Logic .................................... 650DTC Confirmation Procedure ................................ 650Diagnosis Procedure ............................................. 650Component Inspection .......................................... 652

P0222, P0223 TP SENSOR ............................. 653Component Description ......................................... 653On Board Diagnosis Logic .................................... 653DTC Confirmation Procedure ................................ 653Diagnosis Procedure ............................................. 653Component Inspection .......................................... 656

P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE ................................................ 657


P0327, P0328, P0332, P0333 KS .................... 664Component Description ......................................... 664On Board Diagnosis Logic .................................... 664DTC Confirmation Procedure ................................ 664Diagnosis Procedure ............................................. 664Component Inspection .......................................... 666

P0335 CKP SENSOR (POS) ............................ 667Component Description ......................................... 667On Board Diagnosis Logic .................................... 667DTC Confirmation Procedure ................................ 667Diagnosis Procedure ............................................. 667Component Inspection .......................................... 669

P0340, P0345 CMP SENSOR (PHASE) .......... 671Component Description ......................................... 671On Board Diagnosis Logic .................................... 671DTC Confirmation Procedure ................................ 671Diagnosis Procedure ............................................. 672Component Inspection .......................................... 674

P0420, P0430 THREE WAY CATALYST FUNCTION ....................................................... 675

On Board Diagnosis Logic .................................... 675

Diagnosis Procedure .............................................676

P0441 EVAP CONTROL SYSTEM ................. 680System Description ................................................680On Board Diagnosis Logic .....................................680DTC Confirmation Procedure ................................680Overall Function Check .........................................681Diagnosis Procedure .............................................681Component Inspection ...........................................684

P0442 EVAP CONTROL SYSTEM ................. 685On Board Diagnosis Logic .....................................685DTC Confirmation Procedure ................................686Diagnosis Procedure .............................................686Component Inspection ...........................................691

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE ...................... 692


P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE ...... 697









Component Description .........................................712EC-9

DTC Confirmation Procedure ................................ 675Overall Function Check ......................................... 676 On Board Diagnosis Logic .....................................712





P0455 EVAP CONTROL SYSTEM .................. 721On Board Diagnosis Logic .....................................721DTC Confirmation Procedure ................................721Diagnosis Procedure .............................................722Component Inspection ...........................................726

P0456 EVAP CONTROL SYSTEM .................. 728On Board Diagnosis Logic .....................................728DTC Confirmation Procedure ................................729Overall Function Check .........................................729Diagnosis Procedure .............................................730Component Inspection ...........................................735

P0460 FUEL LEVEL SENSOR ........................ 736Component Description .........................................736On Board Diagnosis Logic .....................................736DTC Confirmation Procedure ................................736Diagnosis Procedure .............................................736

P0461 FUEL LEVEL SENSOR ........................ 738Component Description .........................................738On Board Diagnosis Logic .....................................738Overall Function Check .........................................738Diagnosis Procedure .............................................739

P0462, P0463 FUEL LEVEL SENSOR ........... 740Component Description .........................................740On Board Diagnosis Logic .....................................740DTC Confirmation Procedure ................................740Diagnosis Procedure .............................................740

P0500 VSS ....................................................... 742Description .............................................................742On Board Diagnosis Logic .....................................742DTC Confirmation Procedure ................................742Overall Function Check .........................................743Diagnosis Procedure .............................................743

P0506 ISC SYSTEM ........................................ 744Description .............................................................744On Board Diagnosis Logic .....................................744DTC Confirmation Procedure ................................744Diagnosis Procedure .............................................744

P0507 ISC SYSTEM ........................................ 746Description .............................................................746On Board Diagnosis Logic .....................................746

P050E COLD START CONTROL ....................748Description ............................................................ 748On Board Diagnosis Logic .................................... 748DTC Confirmation Procedure ................................ 748Diagnosis Procedure ............................................. 749

P0550 PSP SENSOR .......................................750Component Description ........................................ 750On Board Diagnosis Logic .................................... 750DTC Confirmation Procedure ................................ 750Diagnosis Procedure ............................................. 750Component Inspection .......................................... 752

P0603 ECM POWER SUPPLY .........................753Component Description ........................................ 753On Board Diagnosis Logic .................................... 753DTC Confirmation Procedure ................................ 753Diagnosis Procedure ............................................. 753

P0605 ECM .......................................................755Component Description ........................................ 755On Board Diagnosis Logic .................................... 755DTC Confirmation Procedure ................................ 755Diagnosis Procedure ............................................. 756

P0607 ECM .......................................................757Description ............................................................ 757On Board Diagnosis Logic .................................... 757DTC Confirmation Procedure ................................ 757Diagnosis Procedure ............................................. 757

P0643 SENSOR POWER SUPPLY ..................758On Board Diagnosis Logic .................................... 758DTC Confirmation Procedure ................................ 758Diagnosis Procedure ............................................. 758

P0850 PNP SWITCH ........................................761Component Description ........................................ 761On Board Diagnosis Logic .................................... 761DTC Confirmation Procedure ................................ 761Overall Function Check ......................................... 762Diagnosis Procedure ............................................. 762

P1148, P1168 CLOSED LOOP CONTROL .....765On Board Diagnosis Logic .................................... 765

P1211 TCS CONTROL UNIT ...........................766Description ............................................................ 766On Board Diagnosis Logic .................................... 766DTC Confirmation Procedure ................................ 766Diagnosis Procedure ............................................. 766

P1212 TCS COMMUNICATION LINE ..............767Description ............................................................ 767On Board Diagnosis Logic .................................... 767DTC Confirmation Procedure ................................ 767Diagnosis Procedure ............................................. 767

P1217 ENGINE OVER TEMPERATURE .........768On Board Diagnosis Logic .................................... 768EC-10

DTC Confirmation Procedure ................................746Diagnosis Procedure .............................................746 Overall Function Check ......................................... 768


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Diagnosis Procedure ............................................. 769Main 12 Causes of Overheating ............................ 770




P1551, P1552 BATTERY CURRENT SEN-SOR .................................................................. 780

Component Description ......................................... 780On Board Diagnosis Logic .................................... 780DTC Confirmation Procedure ................................ 780Diagnosis Procedure ............................................. 780Component Inspection .......................................... 782


P1554 BATTERY CURRENT SENSOR ........... 788Component Description ......................................... 788On Board Diagnosis Logic .................................... 788Overall Function Check ......................................... 788Diagnosis Procedure ............................................. 789Component Inspection .......................................... 790

P1564 ASCD STEERING SWITCH .................. 792Component Description ......................................... 792On Board Diagnosis Logic .................................... 792DTC Confirmation Procedure ................................ 792Diagnosis Procedure ............................................. 792Component Inspection .......................................... 794

P1572 ASCD BRAKE SWITCH ....................... 796Component Description ......................................... 796On Board Diagnosis Logic .................................... 796DTC Confirmation Procedure ................................ 796Diagnosis Procedure ............................................. 797Component Inspection .......................................... 803

P1574 ASCD VEHICLE SPEED SENSOR ...... 805


P1715 INPUT SPEED SENSOR ..................... 807Description .............................................................807On Board Diagnosis Logic .....................................807Diagnosis Procedure .............................................807

P1800 VIAS CONTROL SOLENOID VALVE 1 . 808Component Description .........................................808On Board Diagnosis Logic .....................................808DTC Confirmation Procedure ................................808Diagnosis Procedure .............................................808Component Inspection ...........................................809

P1805 BRAKE SWITCH ................................. 811Description .............................................................811On Board Diagnosis Logic .....................................811DTC Confirmation Procedure ................................811Diagnosis Procedure .............................................811Component Inspection ...........................................813

P2100, P2103 THROTTLE CONTROL MO-TOR RELAY .................................................... 814


P2101 ELECTRIC THROTTLE CONTROL FUNCTION ...................................................... 817


P2118 THROTTLE CONTROL MOTOR ......... 821Component Description .........................................821On Board Diagnosis Logic .....................................821DTC Confirmation Procedure ................................821Diagnosis Procedure .............................................821Component Inspection ...........................................822

P2119 ELECTRIC THROTTLE CONTROL ACTUATOR ..................................................... 823


P2122, P2123 APP SENSOR ......................... 825Component Description .........................................825On Board Diagnosis Logic .....................................825DTC Confirmation Procedure ................................825Diagnosis Procedure .............................................826Component Inspection ...........................................827

P2127, P2128 APP SENSOR ......................... 828EC-11

Component Description ......................................... 805On Board Diagnosis Logic .................................... 805

Component Description .........................................828On Board Diagnosis Logic ...................................



P2135 TP SENSOR ......................................... 832Component Description .........................................832On Board Diagnosis Logic .....................................832DTC Confirmation Procedure ................................832Diagnosis Procedure .............................................832Component Inspection ...........................................835

P2138 APP SENSOR ...................................... 836Component Description .........................................836On Board Diagnosis Logic .....................................836DTC Confirmation Procedure ................................836Diagnosis Procedure .............................................837Component Inspection ...........................................839

P2A00, P2A03 A/F SENSOR 1 ....................... 840Component Description .........................................840On Board Diagnosis Logic .....................................840DTC Confirmation Procedure ................................840Diagnosis Procedure .............................................841

ASCD BRAKE SWITCH .................................. 845Component Description .........................................845Diagnosis Procedure .............................................845Component Inspection ...........................................851

ASCD INDICATOR .......................................... 853Component Description .........................................853Diagnosis Procedure .............................................853

COOLING FAN ................................................ 854Description .............................................................854Diagnosis Procedure .............................................854Component Inspection ...........................................855

ELECTRICAL LOAD SIGNAL ......................... 856Description .............................................................856Diagnosis Procedure .............................................856

FUEL INJECTOR ............................................. 858Component Description .........................................858Diagnosis Procedure .............................................858Component Inspection ...........................................861

FUEL PUMP ..................................................... 862Description .............................................................862Diagnosis Procedure .............................................862Component Inspection ...........................................865

IGNITION SIGNAL ........................................... 866Component Description .........................................866Diagnosis Procedure .............................................866Component Inspection ...........................................869

ON BOARD REFUELING VAPOR RECOV-ERY (ORVR) .................................................... 871

System Description ................................................871


POSITIVE CRANKCASE VENTILATION .........876Description ............................................................ 876Component Inspection .......................................... 876

REFRIGERANT PRESSURE SENSOR ...........878Component Description ........................................ 878Diagnosis Procedure ............................................. 878

VIAS ..................................................................881Diagnosis Procedure ............................................. 881Component Inspection .......................................... 883

ECU DIAGNOSIS ......................................885

ECM ..................................................................885CONSULT-III Reference Value in Data Monitor Mode ..................................................................... 885ECM Harness Connector Terminal Layout ........... 888ECM Terminal and Reference Value .................... 888Wiring Diagram ..................................................... 897Fail-Safe Chart ...................................................... 916DTC Inspection Priority Chart ............................... 918DTC Index ............................................................. 919Emission-related Diagnostic Information .............. 922

SYMPTOM DIAGNOSIS ...........................943

ENGINE CONTROL SYSTEM SYMPTOMS ....943Symptom Matrix Chart .......................................... 943

NORMAL OPERATING CONDITION ...............947Fuel Cut Control (at No Load and High Engine Speed) .................................................................. 947

PRECAUTION ...........................................948

PRECAUTIONS ................................................948Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-SIONER" ............................................................... 948Precaution for Procedure without Cowl Top Cover . 948On Board Diagnosis (OBD) System of Engine and A/T ........................................................................ 948Precaution ............................................................. 949

PREPARATION .........................................952

PREPARATION ................................................952Special Service Tool ............................................. 952Commercial Service Tool ...................................... 953

ON-VEHICLE MAINTENANCE .................954

FUEL PRESSURE ............................................954Fuel Pressure Check ............................................ 954

EVAP LEAK CHECK ........................................956How to Detect Fuel Vapor Leakage ...................... 956EC-12

Diagnosis Procedure .............................................871 ON-VEHICLE REPAIR ..............................957


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EVAP CANISTER ............................................. 957Component Inspection .......................................... 957Removal and Installation ....................................... 957

SERVICE DATA AND SPECIFICATIONS (SDS) .......................................................... 958

SERVICE DATA AND SPECIFICATIONS (SDS) ................................................................ 958

Fuel Pressure ........................................................ 958Idle Speed and Ignition Timing .............................. 958

Calculated Load Value ..........................................958Mass Air Flow Sensor ............................................958Intake Air Temperature Sensor .............................958Engine Coolant Temperature Sensor ....................958Air Fuel Ratio (A/F) Sensor 1 Heater .....................958Heated Oxygen sensor 2 Heater ...........................959Crankshaft Position Sensor (POS) ........................959Camshaft Position Sensor (PHASE) .....................959Throttle Control Motor ............................................959Fuel Injector ...........................................................959Fuel Pump .............................................................959EC-13Revision: July 2009 2010 Frontier

< BASIC INSPECTION > [QR25DE]DIAGNOSIS AND REPAIR WORK FLOW

BASIC INSPECTIONDIAGNOSIS AND REPAIR WORK FLOWTrouble Diagnosis Introduction INFOID:0000000005273018

INTRODUCTIONThe engine has an ECM to control major systems such as fuel con-trol, ignition control, idle air control system, etc. The ECM acceptsinput signals from sensors and instantly drives actuators. It is essen-tial that both input and output signals are proper and stable. At thesame time, it is important that there are no malfunctions such as vac-uum leaks, fouled spark plugs, or other malfunctions with the engine.

It is much more difficult to diagnose an incident that occurs intermit-tently rather than continuously. Most intermittent incidents arecaused by poor electric connections or improper wiring. In this case,careful checking of suspected circuits may help prevent the replace-ment of good parts.

A visual check only may not find the cause of the incidents. A roadtest with CONSULT-III (or GST) or a circuit tester connected shouldbe performed. Follow the WORK FLOW on "WORK FLOW".Before undertaking actual checks, take a few minutes to talk with acustomer who approaches with a driveability complaint. The cus-tomer can supply good information about such incidents, especiallyintermittent ones. Find out what symptoms are present and underwhat conditions they occur. A DIAGNOSTIC WORKSHEET like theexample on "Worksheet Sample" should be used.Start your diagnosis by looking for conventional malfunctions first.This will help troubleshoot driveability malfunctions on an electroni-cally controlled engine vehicle.

WORK FLOWOverall Sequence

MEF036D

SEF233G

SEF234GEC-14Revision: July 2009 2010 Frontier

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ODIAGNOSIS AND REPAIR WORK FLOW< BASIC INSPECTION > [QR25DE]

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Detailed Flow

1.GET INFORMATION FOR SYMPTOMGet the detailed information from the customer about the symptom (the condition and the environment whenthe incident/malfunction occurred) using the "DIAGNOSTIC WORKSHEET".

JMBIA1416GBEC-15

>> GO TO 2.



2.CHECK DTC*11. Check DTC*1.2. Perform the following procedure if DTC*1 is displayed.- Record DTC*1 and freeze frame data*2. (Print them out with CONSULT-III or GST.)- Erase DTC*1. (Refer to EC-424, "DTC Index".)- Study the relationship between the cause detected by DTC*1 and the symptom described by the cus-

tomer. (Symptom Matrix Chart is useful. Refer to EC-443, "Symptom Matrix Chart".)3. Check related service bulletins for information.Are any symptoms described and any DTCs detected?Symptom is described, DTC*1 is displayed>>GO TO 3.Symptom is described, DTC*1 is not displayed>>GO TO 4.Symptom is not described, DTC*1 is displayed>>GO TO 5.

3.CONFIRM THE SYMPTOMTry to confirm the symptom described by the customer (except MIL ON).Diagnosis Work Sheet is useful to verify the incident.Connect CONSULT-III to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosisresults.Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.4.CONFIRM THE SYMPTOMTry to confirm the symptom described by the customer.DIAGNOSIS WORK SHEET is useful to verify the incident.Connect CONSULT-III to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosisresults.Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.5.PERFORM DTC CONFIRMATION PROCEDUREPerform DTC Confirmation Procedure for the displayed DTC*1, and then make sure that DTC*1 is detectedagain.At this time, always connect CONSULT-III to the vehicle, and check diagnostic results in real time on DATAMONITOR (AUTO TRIG).If two or more DTCs*1 are detected, refer to EC-424, "DTC Inspection Priority Chart" and determine troublediagnosis order.NOTE: Freeze frame data*2 is useful if the DTC*1 is not detected. Perform Overall Function Check if DTC Confirmation Procedure is not included on Service Manual. This

simplified check procedure is an effective alternative though DTC*1 cannot be detected during this check.If the result of Overall Function Check is NG, it is the same as the detection of DTC*1 by DTC ConfirmationProcedure.

Is DTC*1 detected?Yes >> GO TO 10.No >> Check according toGI-46, "Intermittent Incident" .

6.PERFORM BASIC INSPECTIONPerform EC-19, "Basic Inspection".

With CONSULT-III>>GO TO 7.Without CONSULT-III>>GO TO 9.EC-16Revision: July 2009 2010 Frontier

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7.PERFORM DATA MONITOR (SPEC) MODE With CONSULT-III

Make sure that MAS A/F SE-B1, B/FUEL SCHDL, and A/F ALPHA-B1 are within the SP value usingCONSULT-III DATA MONITOR (SPEC) mode. Refer to EC-79.Are they within the SP value?Yes >> GO TO 9.No >> GO TO 8.

8.DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUEDetect malfunctioning part according to EC-79, "Diagnosis Procedure".Is a malfunctioning part detected?Yes >> GO TO 11.No >> GO TO 9.

9.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM MATRIX CHARTDetect malfunctioning system according to EC-443, "Symptom Matrix Chart" based on the confirmed symptomin step 4, and determine the trouble diagnosis order based on possible causes and symptoms.

>> GO TO 10.10.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDUREInspect according to Diagnostic Procedure of the system.NOTE:The Diagnostic Procedure in EC section described based on open circuit inspection. A short circuit inspectionis also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in GI-43, "How to Check Terminal".Is a malfunctioning part detected?Yes >> GO TO 11.No >> Monitor input data from related sensors or check voltage of related ECM terminals using CON-

SULT-III. Refer to EC-397, "CONSULT-III Reference Value in Data Monitor Mode" , EC-400, "ECMTerminal and Reference Value".

11.REPAIR OR REPLACE THE MALFUNCTIONING PART1. Repair or replace the malfunctioning part.2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.3. Check DTC. If DTC is displayed, erase it, refer to EC-424, "DTC Index".

>> GO TO 12.12.FINAL CHECKWhen DTC was detected in step 2, perform DTC Confirmation Procedure or Overall Function Check again,and then make sure that the malfunction have been completely repaired.When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and make surethat the symptom is not detected.OK or NGNG (DTC*1 is detected)>>GO TO 10.NG (Symptom remains)>>GO TO 6.OK >> 1. Before returning the vehicle to the customer, make sure to always erase unnecessary DTC*1

in ECM and TCM (Transmission Control Module). (Refer to EC-424, "DTC Index" .)2. If the completion of SRT is needed, drive vehicle under the specific driving pattern. Refer to

EC-424, "DTC Index".3. INSPECTION END

*1: Include 1st trip DTC.*2: Include 1st trip freeze frame data.EC-17

DIAGNOSTIC WORKSHEET



DescriptionThere are many operating conditions that lead to the malfunction ofengine components. A good grasp of such conditions can make trou-bleshooting faster and more accurate.In general, each customer feels differently about an incident. It isimportant to fully understand the symptoms or conditions for a cus-tomer complaint.Utilize a diagnostic worksheet like the one on the next page in orderto organize all the information for troubleshooting.Some conditions may cause the MIL to come on steady or blink, andDTC to be detected. Examples: Vehicle ran out of fuel, which caused the engine to misfire. Fuel filler cap was left off or incorrectly screwed on, allowing fuel to

evaporate into the atmosphere.Worksheet Sample

SEF907L

MTBL0017EC-18Revision: July 2009 2010 Frontier

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INSPECTION AND ADJUSTMENTBasic Inspection INFOID:0000000005273019

1.INSPECTION START1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for

scheduled maintenance.2. Open engine hood and check the following:- Harness connectors for improper connections- Wiring harness for improper connections, pinches and cut- Vacuum hoses for splits, kinks and improper connections- Hoses and ducts for leakage- Air cleaner clogging- Gasket3. Check that electrical or mechanical loads are not applied.- Headlamp switch is OFF.- Air conditioner switch is OFF.- Steering wheel is in the straight-ahead position, etc.4. Start engine and warm it up until engine coolant temperature

indicator points to the middle of gauge.Ensure engine stays below 1,000 rpm.

5. Run engine at about 2,000 rpm for about 2 minutes under noload.

6. Make sure that no DTC is displayed with CONSULT-III or GST.OK or NGOK >> GO TO 3.NG >> GO TO 2.

2.REPAIR OR REPLACERepair or replace components as necessary according to corresponding Diagnostic Procedure.

>> GO TO 3.3.CHECK TARGET IDLE SPEED

With CONSULT-III1. Run engine at about 2,000 rpm for about 2 minutes under no load.

SEF983U

SEF976U

SEF977UEC-19Revision: July 2009 2010 Frontier

< BASIC INSPECTION > [QR25DE]INSPECTION AND ADJUSTMENT

2. Rev engine (2,000 to 3,00

nissan d 40 ec

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