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EC


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B ENGINE

                                                                                                                                                                        A


                                                                                                                                                                        EC
                                                                                                       SECTION
                                                                           ENGINE CONTROL SYSTEM                                                                        C


                                                                                                                                                                        D


                                                                                                                                                                        E
                                                                    CONTENTS
INDEX FOR DTC ....................................................... 9     .         Description ............................................................. 45
                                                                                                                                                               .        F
  DTC No. Index ........................................................ 9  .         Component Inspection ........................................... 45      .
  Alphabetical Index ................................................. 13   .        NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-
PRECAUTIONS ....................................................... 17      .        NATS) ....................................................................... 47
                                                                                                                                                               .        G
  Precautions for Supplemental Restraint System                                       Description ............................................................. 47
                                                                                                                                                               .
  (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                            ON BOARD DIAGNOSTIC (OBD) SYSTEM ........... 48                           .
  SIONER" ............................................................... 17.         Introduction ............................................................ 48
                                                                                                                                                               .
                                                                                                                                                                        H
  On Board Diagnostic (OBD) System of Engine and                                      Two Trip Detection Logic ....................................... 48      .
  A/T ......................................................................... 17
                                                                            .         Emission-related Diagnostic Information ............... 49               .
  Precaution ............................................................. 17
                                                                            .         Malfunction Indicator Lamp (MIL) .......................... 63           .
  Wiring Diagrams and Trouble Diagnosis ............... 20                  .         OBD System Operation Chart ............................... 66            .         I
PREPARATION ........................................................ 21     .        BASIC SERVICE PROCEDURE .............................. 72                 .
  Special Service Tools ............................................ 21     .         Basic Inspection .................................................... 72 .
  Commercial Service Tools ..................................... 23         .         Idle Speed and Ignition Timing Check ................... 77              .        J
ENGINE CONTROL SYSTEM ................................. 24                  .         Idle Mixture Ratio Adjustment ................................ 78        .
  System Diagram .................................................... 24    .         VIN Registration .................................................... 89 .
  Multiport Fuel Injection (MFI) System ................... 25              .         Accelerator Pedal Released Position Learning ..... 89                    .
                                                                                                                                                                        K
  Electronic Ignition (EI) System .............................. 27         .         Throttle Valve Closed Position Learning ................ 89              .
  Fuel Cut Control (at No Load and High Engine                                        Idle Air Volume Learning ....................................... 90      .
  Speed) ................................................................... 28
                                                                            .         Fuel Pressure Check ............................................. 92     .
AIR CONDITIONING CUT CONTROL .................... 29                        .        TROUBLE DIAGNOSIS ........................................... 94          .        L
  Input/Output Signal Chart ...................................... 29       .         Trouble Diagnosis Introduction .............................. 94         .
  System Description ............................................... 29     .         DTC Inspection Priority Chart .............................. 100         .
AUTOMATIC SPEED CONTROL DEVICE (ASCD) 30                                    ...       Fail-safe Chart ..................................................... 102.        M
  System Description ............................................... 30     .         Symptom Matrix Chart ......................................... 103       .
  Component Description ......................................... 31        .         Engine Control Component Parts Location ......... 107                    .
CAN COMMUNICATION ......................................... 32              .         Vacuum Hose Drawing ........................................ 114         .
  System Description ............................................... 32     .         Circuit Diagram .................................................... 115 .
EVAPORATIVE EMISSION SYSTEM ...................... 33                       .         ECM Harness Connector Terminal Layout .......... 117                     .
  Description ............................................................ 33
                                                                            .         ECM Terminals and Reference Value .................. 117                 .
  Component Inspection .......................................... 36        .         CONSULT-II Function (ENGINE) ......................... 126               .
  Removal and Installation ....................................... 37       .         Generic Scan Tool (GST) Function ...................... 140              .
  How to Detect Fuel Vapor Leakage ...................... 37                .         CONSULT-II Reference Value in Data Monitor .... 143                      .
ON BOARD REFUELING VAPOR RECOVERY                                                     Major Sensor Reference Graph in Data Monitor
(ORVR) ..................................................................... 40
                                                                            .         Mode .................................................................... 147
                                                                                                                                                               .
  System Description ............................................... 40     .        TROUBLE DIAGNOSIS - SPECIFICATION VALUE 149                               .
  Diagnostic Procedure ............................................ 41      .         Description ........................................................... 149
                                                                                                                                                               .
  Component Inspection .......................................... 43        .         Testing Condition ................................................. 149  .
POSITIVE CRANKCASE VENTILATION ................ 45                          .         Inspection Procedure ........................................... 149     .
                                                                                      Diagnostic Procedure .......................................... 150      .


Revision: February 2006                                                        EC-1                                                                 2005 Xterra
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-                                           Diagnostic Procedure ........................................... 203
                                                                                                                                                     .
DENT ...................................................................... 159
                                                                          .        Component Inspection ......................................... 204.
 Description ........................................................... 159
                                                                          .        Removal and Installation ...................................... 204
                                                                                                                                                     .
 Diagnostic Procedure .......................................... 159      .       DTC P0117, P0118 ECT SENSOR ......................... 205          .
POWER SUPPLY AND GROUND CIRCUIT .......... 160                            .        Component Description ....................................... 205 .
 Wiring Diagram .................................................... 160  .        On Board Diagnosis Logic ................................... 205  .
 Diagnostic Procedure .......................................... 163      .        DTC Confirmation Procedure ............................... 206    .
 Ground Inspection ............................................... 166    .        Wiring Diagram .................................................... 207
                                                                                                                                                     .
DTC U1000, U1001 CAN COMMUNICATION LINE. 168                                       Diagnostic Procedure ........................................... 208
                                                                                                                                                     .
 Description ........................................................... 168
                                                                          .        Component Inspection ......................................... 209.
 On Board Diagnosis Logic ................................... 168         .        Removal and Installation ...................................... 209
                                                                                                                                                     .
 DTC Confirmation Procedure .............................. 168            .       DTC P0122, P0123 TP SENSOR ........................... 210         .
 Wiring Diagram .................................................... 169  .        Component Description ....................................... 210 .
 Diagnostic Procedure .......................................... 170      .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0011, P0021 IVT CONTROL ....................... 171                  .                                                                          .210
 Description ........................................................... 171
                                                                          .        On Board Diagnosis Logic ................................... 210  .
 CONSULT-II Reference Value in Data Monitor Mode                                   DTC Confirmation Procedure ............................... 211    .
                                                                          . 171    Wiring Diagram .................................................... 212
                                                                                                                                                     .
 On Board Diagnosis Logic ................................... 172         .        Diagnostic Procedure ........................................... 213
                                                                                                                                                     .
 DTC Confirmation Procedure .............................. 172            .        Component Inspection ......................................... 216.
 Diagnostic Procedure .......................................... 173      .        Removal and Installation ...................................... 216
                                                                                                                                                     .
 Component Inspection ......................................... 174       .       DTC P0125 ECT SENSOR ..................................... 217     .
 Removal and Installation ..................................... 174       .        Component Description ....................................... 217 .
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER 175                           .        On Board Diagnosis Logic ................................... 217  .
 Description ........................................................... 175
                                                                          .        DTC Confirmation Procedure ............................... 218    .
 CONSULT-II Reference Value in Data Monitor Mode                                   Diagnostic Procedure ........................................... 218
                                                                                                                                                     .
                                                                          . 175    Component Inspection ......................................... 219.
 On Board Diagnosis Logic ................................... 175         .        Removal and Installation ...................................... 219
                                                                                                                                                     .
 DTC Confirmation Procedure .............................. 176            .       DTC P0127 IAT SENSOR ....................................... 220   .
 Wiring Diagram .................................................... 177  .        Component Description ....................................... 220 .
 Diagnostic Procedure .......................................... 180      .        On Board Diagnosis Logic ................................... 220  .
 Component Inspection ......................................... 182       .        DTC Confirmation Procedure ............................... 220    .
 Removal and Installation ..................................... 183       .        Diagnostic Procedure ........................................... 221
                                                                                                                                                     .
DTC P0101 MAF SENSOR .................................... 184             .        Component Inspection ......................................... 222.
 Component Description ....................................... 184        .        Removal and Installation ...................................... 222
                                                                                                                                                     .
 CONSULT-II Reference Value in Data Monitor Mode                                  DTC P0128 THERMOSTAT FUNCTION ................ 223                 .
                                                                          . 184    On Board Diagnosis Logic ................................... 223  .
 On Board Diagnosis Logic ................................... 184         .        DTC Confirmation Procedure ............................... 223    .
 DTC Confirmation Procedure .............................. 185            .        Diagnostic Procedure ........................................... 223
                                                                                                                                                     .
 Overall Function Check ....................................... 186       .        Component Inspection ......................................... 224.
 Wiring Diagram .................................................... 187  .        Removal and Installation ...................................... 224
                                                                                                                                                     .
 Diagnostic Procedure .......................................... 188      .       DTC P0138, P0158 HO2S2 .................................... 225    .
 Component Inspection ......................................... 190       .        Component Description ....................................... 225 .
 Removal and Installation ..................................... 192       .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0102, P0103 MAF SENSOR ........................ 193                  .                                                                          .225
 Component Description ....................................... 193        .        On Board Diagnosis Logic ................................... 225  .
 CONSULT-II Reference Value in Data Monitor Mode                                   DTC Confirmation Procedure ............................... 226    .
                                                                          . 193    Wiring Diagram .................................................... 227
                                                                                                                                                     .
 On Board Diagnosis Logic ................................... 193         .        Diagnostic Procedure ........................................... 230
                                                                                                                                                     .
 DTC Confirmation Procedure .............................. 194            .        Component Inspection ......................................... 233.
 Wiring Diagram .................................................... 195  .        Removal and Installation ...................................... 234
                                                                                                                                                     .
 Diagnostic Procedure .......................................... 196      .       DTC P0139, P0159 HO2S2 .................................... 235    .
 Component Inspection ......................................... 198       .        Component Description ....................................... 235 .
 Removal and Installation ..................................... 199       .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0112, P0113 IAT SENSOR .......................... 200                .                                                                          .235
 Component Description ....................................... 200        .        On Board Diagnosis Logic ................................... 235  .
 On Board Diagnosis Logic ................................... 200         .        DTC Confirmation Procedure ............................... 236    .
 DTC Confirmation Procedure .............................. 200            .        Overall Function Check ........................................ 236
                                                                                                                                                     .
 Wiring Diagram .................................................... 202  .        Wiring Diagram .................................................... 238
                                                                                                                                                     .

Revision: February 2006                                                      EC-2                                                          2005 Xterra
  Diagnostic Procedure .......................................... 241.         DTC Confirmation Procedure .............................. 300            .
  Component Inspection ........................................ 244  .         Wiring Diagram .................................................... 301  .       A
  Removal and Installation ..................................... 246 .         Diagnostic Procedure .......................................... 302      .
DTC P0171, P0174 FUEL INJECTION SYSTEM                                         Component Inspection ......................................... 305       .
FUNCTION ............................................................. 247
                                                                     .         Removal and Installation ..................................... 305       .       EC
  On Board Diagnosis Logic .................................. 247    .       DTC P0340, P0345 CMP SENSOR (PHASE) ....... 306                            .
  DTC Confirmation Procedure .............................. 247      .         Component Description ....................................... 306        .
  Wiring Diagram ................................................... 249
                                                                     .         CONSULT-II Reference Value in Data Monitor Mode
  Diagnostic Procedure .......................................... 251.                                                                                  . 306   C
DTC P0172, P0175 FUEL INJECTION SYSTEM                                         On Board Diagnosis Logic ................................... 306         .
FUNCTION ............................................................. 257
                                                                     .         DTC Confirmation Procedure .............................. 307            .
  On Board Diagnosis Logic .................................. 257    .         Wiring Diagram .................................................... 308  .       D
  DTC Confirmation Procedure .............................. 257      .         Diagnostic Procedure .......................................... 311      .
  Wiring Diagram ................................................... 259
                                                                     .         Component Inspection ......................................... 314       .
  Diagnostic Procedure .......................................... 261.         Removal and Installation ..................................... 314       .       E
DTC P0181 FTT SENSOR ..................................... 267       .       DTC P0420, P0430 THREE WAY CATALYST FUNC-
  Component Description ....................................... 267  .       TION ....................................................................... 315
                                                                                                                                                        .
  On Board Diagnosis Logic .................................. 267    .         On Board Diagnosis Logic ................................... 315         .
  DTC Confirmation Procedure .............................. 267      .         DTC Confirmation Procedure .............................. 315            .       F
  Wiring Diagram ................................................... 269
                                                                     .         Overall Function Check ....................................... 316       .
  Diagnostic Procedure .......................................... 270.         Diagnostic Procedure .......................................... 317      .
  Component Inspection ........................................ 271  .       DTC P0441 EVAP CONTROL SYSTEM ................ 321                         .       G
  Removal and Installation ..................................... 272 .         System Description .............................................. 321    .
DTC P0182, P0183 FTT SENSOR ........................ 273             .         On Board Diagnosis Logic ................................... 321         .
  Component Description ....................................... 273  .         DTC Confirmation Procedure .............................. 322            .       H
  On Board Diagnosis Logic .................................. 273    .         Overall Function Check ....................................... 322       .
  DTC Confirmation Procedure .............................. 273      .         Diagnostic Procedure .......................................... 323      .
  Wiring Diagram ................................................... 274
                                                                     .       DTC P0442 EVAP CONTROL SYSTEM ................ 327                         .
                                                                                                                                                                 I
  Diagnostic Procedure .......................................... 275.         On Board Diagnosis Logic ................................... 327         .
  Component Inspection ........................................ 276  .         DTC Confirmation Procedure .............................. 328            .
  Removal and Installation ..................................... 277 .         Diagnostic Procedure .......................................... 329      .
DTC P0222, P0223 TP SENSOR .......................... 278            .       DTC P0444, P0445 EVAP CANISTER PURGE VOL-                                          J
  Component Description ....................................... 278  .       UME CONTROL SOLENOID VALVE ..................... 335                       .
  CONSULT-II Reference Value in Data Monitor Mode                              Description ........................................................... 335
                                                                                                                                                        .
                                                                     . 278     CONSULT-II Reference Value in Data Monitor Mode                                  K
  On Board Diagnosis Logic .................................. 278    .                                                                                  . 335
  DTC Confirmation Procedure .............................. 279      .         On Board Diagnosis Logic ................................... 336         .
  Wiring Diagram ................................................... 280
                                                                     .         DTC Confirmation Procedure .............................. 336            .       L
  Diagnostic Procedure .......................................... 281.         Wiring Diagram .................................................... 337  .
  Component Inspection ........................................ 284  .         Diagnostic Procedure .......................................... 339      .
  Removal and Installation ..................................... 284 .         Component Inspection ......................................... 340       .
DTC P0300 - P0306 MULTIPLE CYLINDER MIS-                                       Removal and Installation ..................................... 341       .       M
FIRE, NO. 1 - 6 CYLINDER MISFIRE .................... 285            .       DTC P0447 EVAP CANISTER VENT CONTROL
  On Board Diagnosis Logic .................................. 285    .       VALVE .................................................................... 342
                                                                                                                                                        .
  DTC Confirmation Procedure .............................. 285      .         Component Description ....................................... 342        .
  Diagnostic Procedure .......................................... 286.         CONSULT-II Reference Value in Data Monitor Mode
DTC P0327, P0328, P0332, P0333 KS ................. 294              .                                                                                  . 342
  Component Description ....................................... 294  .         On Board Diagnosis Logic ................................... 342         .
  On Board Diagnosis Logic .................................. 294    .         DTC Confirmation Procedure .............................. 343            .
  DTC Confirmation Procedure .............................. 294      .         Wiring Diagram .................................................... 344  .
  Wiring Diagram ................................................... 295
                                                                     .         Diagnostic Procedure .......................................... 345      .
  Diagnostic Procedure .......................................... 296.         Component Inspection ......................................... 347       .
  Component Inspection ........................................ 298  .       DTC P0451 EVAP CONTROL SYSTEM PRESSURE
  Removal and Installation ..................................... 298 .       SENSOR ................................................................ 349.
DTC P0335 CKP SENSOR (POS) ......................... 299             .         Component Description ....................................... 349        .
  Component Description ....................................... 299  .         CONSULT-II Reference Value in Data Monitor Mode
  CONSULT-II Reference Value in Data Monitor Mode                                                                                                       . 349
                                                                     . 299     On Board Diagnosis Logic ................................... 349         .
  On Board Diagnosis Logic .................................. 299    .         DTC Confirmation Procedure .............................. 350            .

Revision: February 2006                                                 EC-3                                                                2005 Xterra
 Diagnostic Procedure .......................................... 350   .        DTC Confirmation Procedure ............................... 390           .
 Component Inspection ......................................... 351    .        Diagnostic Procedure ........................................... 391     .
DTC P0452 EVAP CONTROL SYSTEM PRESSURE                                         DTC P0507 ISC SYSTEM ...................................... 392           .
SENSOR ................................................................. 352
                                                                       .        Description ........................................................... 392
                                                                                                                                                         .
 Component Description ....................................... 352     .        On Board Diagnosis Logic ................................... 392         .
 CONSULT-II Reference Value in Data Monitor Mode                                DTC Confirmation Procedure ............................... 392           .
                                                                       . 352    Diagnostic Procedure ........................................... 393     .
 On Board Diagnosis Logic ................................... 352      .       DTC P0550 PSP SENSOR ..................................... 394            .
 DTC Confirmation Procedure .............................. 353         .        Component Description ....................................... 394        .
 Wiring Diagram .................................................... 354
                                                                       .        CONSULT-II Reference Value in Data Monitor Mode
 Diagnostic Procedure .......................................... 355   .                                                                                 .394
 Component Inspection ......................................... 357    .        On Board Diagnosis Logic ................................... 394         .
DTC P0453 EVAP CONTROL SYSTEM PRESSURE                                          DTC Confirmation Procedure ............................... 394           .
SENSOR ................................................................. 358
                                                                       .        Wiring Diagram .................................................... 395  .
 Component Description ....................................... 358     .        Diagnostic Procedure ........................................... 396     .
 CONSULT-II Reference Value in Data Monitor Mode                                Component Inspection ......................................... 398       .
                                                                       . 358    Removal and Installation ...................................... 398      .
 On Board Diagnosis Logic ................................... 358      .       DTC P0605 ECM .................................................... 399    .
 DTC Confirmation Procedure .............................. 359         .        Component Description ....................................... 399        .
 Wiring Diagram .................................................... 360
                                                                       .        On Board Diagnosis Logic ................................... 399         .
 Diagnostic Procedure .......................................... 361   .        DTC Confirmation Procedure ............................... 399           .
 Component Inspection ......................................... 365    .        Diagnostic Procedure ........................................... 400     .
DTC P0455 EVAP CONTROL SYSTEM ................ 366                     .       DTC P1031, P1032, P1051, P1052 A/F SENSOR 1
 On Board Diagnosis Logic ................................... 366      .       HEATER .................................................................. 402
                                                                                                                                                         .
 DTC Confirmation Procedure .............................. 367         .        Description ........................................................... 402
                                                                                                                                                         .
 Diagnostic Procedure .......................................... 368   .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0456 EVAP CONTROL SYSTEM ................ 373                     .                                                                                 .402
 On Board Diagnosis Logic ................................... 373      .        On Board Diagnosis Logic ................................... 402         .
 DTC Confirmation Procedure .............................. 374         .        DTC Confirmation Procedure ............................... 402           .
 Overall Function Check ....................................... 375    .        Wiring Diagram .................................................... 404  .
 Diagnostic Procedure .......................................... 376   .        Diagnostic Procedure ........................................... 407     .
DTC P0460 FUEL LEVEL SENSOR ...................... 382                 .        Component Inspection ......................................... 409       .
 Component Description ....................................... 382     .        Removal and Installation ...................................... 409      .
 On Board Diagnosis Logic ................................... 382      .       DTC P1065 ECM POWER SUPPLY ....................... 410                    .
 DTC Confirmation Procedure .............................. 382         .        Component Description ....................................... 410        .
 Diagnostic Procedure .......................................... 383   .        On Board Diagnosis Logic ................................... 410         .
 Removal and Installation ..................................... 383    .        DTC Confirmation Procedure ............................... 410           .
DTC P0461 FUEL LEVEL SENSOR ...................... 384                 .        Wiring Diagram .................................................... 411  .
 Component Description ....................................... 384     .        Diagnostic Procedure ........................................... 412     .
 On Board Diagnosis Logic ................................... 384      .       DTC P1111, P1136 IVT CONTROL SOLENOID
 Overall Function Check ....................................... 384    .       VALVE ..................................................................... 414
                                                                                                                                                         .
 Diagnostic Procedure .......................................... 385   .        Component Description ....................................... 414        .
 Removal and Installation ..................................... 385    .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0462, P0463 FUEL LEVEL SENSOR ......... 386                       .                                                                                 .414
 Component Description ....................................... 386     .        On Board Diagnosis Logic ................................... 414         .
 On Board Diagnosis Logic ................................... 386      .        DTC Confirmation Procedure ............................... 414           .
 DTC Confirmation Procedure .............................. 386         .        Wiring Diagram .................................................... 415  .
 Diagnostic Procedure .......................................... 387   .        Diagnostic Procedure ........................................... 418     .
 Removal and Installation ..................................... 387    .        Component Inspection ......................................... 420       .
DTC P0500 VSS ..................................................... 388.        Removal and Installation ...................................... 420      .
 Description ........................................................... 388
                                                                       .       DTC P1121 ELECTRIC THROTTLE CONTROL
 On Board Diagnosis Logic ................................... 388      .       ACTUATOR ............................................................ 421 .
 DTC Confirmation Procedure .............................. 388         .        Component Description ....................................... 421        .
 Overall Function Check ....................................... 388    .        On Board Diagnosis Logic ................................... 421         .
 Diagnostic Procedure .......................................... 389   .        DTC Confirmation Procedure ............................... 421           .
DTC P0506 ISC SYSTEM ...................................... 390        .        Diagnostic Procedure ........................................... 422     .
 Description ........................................................... 390
                                                                       .       DTC P1122 ELECTRIC THROTTLE CONTROL
 On Board Diagnosis Logic ................................... 390      .       FUNCTION ............................................................. 423.
                                                                                Description ........................................................... 423
                                                                                                                                                         .

Revision: February 2006                                                   EC-4                                                                2005 Xterra
 On Board Diagnosis Logic .................................. 423        .        CONSULT-II Reference Value in Data Monitor Mode
 DTC Confirmation Procedure .............................. 423          .                                                                          . 467   A
 Wiring Diagram ................................................... 424 .        On Board Diagnosis Logic ................................... 468  .
 Diagnostic Procedure .......................................... 425    .        Overall Function Check ....................................... 468.
 Component Inspection ........................................ 428      .        Wiring Diagram .................................................... 470
                                                                                                                                                   .       EC
 Removal and Installation ..................................... 428     .        Diagnostic Procedure .......................................... 472
                                                                                                                                                   .
DTC P1124, P1126 THROTTLE CONTROL MOTOR                                          Main 12 Causes of Overheating .......................... 475      .
RELAY ................................................................... 429
                                                                        .        Component Inspection ......................................... 476.
 Component Description ....................................... 429      .       DTC P1225 TP SENSOR ....................................... 477    .       C
 CONSULT-II Reference Value in Data Monitor Mode                                 Component Description ....................................... 477 .
                                                                        . 429    On Board Diagnosis Logic ................................... 477  .
 On Board Diagnosis Logic .................................. 429        .        DTC Confirmation Procedure .............................. 477     .       D
 DTC Confirmation Procedure .............................. 429          .        Diagnostic Procedure .......................................... 478
                                                                                                                                                   .
 Wiring Diagram ................................................... 431 .        Removal and Installation ..................................... 478.
 Diagnostic Procedure .......................................... 432    .       DTC P1226 TP SENSOR ....................................... 479    .       E
DTC P1128 THROTTLE CONTROL MOTOR ....... 434                            .        Component Description ....................................... 479 .
 Component Description ....................................... 434      .        On Board Diagnosis Logic ................................... 479  .
 On Board Diagnosis Logic .................................. 434        .        DTC Confirmation Procedure .............................. 479     .
 DTC Confirmation Procedure .............................. 434          .        Diagnostic Procedure .......................................... 480
                                                                                                                                                   .       F
 Wiring Diagram ................................................... 435 .        Removal and Installation ..................................... 480.
 Diagnostic Procedure .......................................... 436    .       DTC P1229 SENSOR POWER SUPPLY ............... 481                  .
 Component Inspection ........................................ 437      .        On Board Diagnosis Logic ................................... 481  .       G
 Removal and Installation ..................................... 438     .        DTC Confirmation Procedure .............................. 481     .
DTC P1146, P1166 HO2S2 .................................... 439         .        Wiring Diagram .................................................... 482
                                                                                                                                                   .
 Component Description ....................................... 439      .        Diagnostic Procedure .......................................... 483
                                                                                                                                                   .       H
 CONSULT-II Reference Value in Data Monitor Mode                                DTC P1271, P1281 A/F SENSOR 1 ...................... 486           .
                                                                        . 439    Component Description ....................................... 486 .
 On Board Diagnosis Logic .................................. 439        .        CONSULT-II Reference Value in Data Monitor Mode
                                                                                                                                                            I
 DTC Confirmation Procedure .............................. 440          .                                                                          . 486
 Overall Function Check ....................................... 440     .        On Board Diagnosis Logic ................................... 486  .
 Wiring Diagram ................................................... 442 .        DTC Confirmation Procedure .............................. 486     .
 Diagnostic Procedure .......................................... 445    .        Wiring Diagram .................................................... 488
                                                                                                                                                   .       J
 Component Inspection ........................................ 448      .        Diagnostic Procedure .......................................... 491
                                                                                                                                                   .
 Removal and Installation ..................................... 450     .        Removal and Installation ..................................... 494.
DTC P1147, P1167 HO2S2 .................................... 451         .       DTC P1272, P1282 A/F SENSOR 1 ...................... 495           .       K
 Component Description ....................................... 451      .        Component Description ....................................... 495 .
 CONSULT-II Reference Value in Data Monitor Mode                                 CONSULT-II Reference Value in Data Monitor Mode
                                                                        . 451                                                                      . 495   L
 On Board Diagnosis Logic .................................. 451        .        On Board Diagnosis Logic ................................... 495  .
 DTC Confirmation Procedure .............................. 452          .        DTC Confirmation Procedure .............................. 495     .
 Overall Function Check ....................................... 452     .        Wiring Diagram .................................................... 497
                                                                                                                                                   .
 Wiring Diagram ................................................... 454 .        Diagnostic Procedure .......................................... 500
                                                                                                                                                   .       M
 Diagnostic Procedure .......................................... 457    .        Removal and Installation ..................................... 503.
 Component Inspection ........................................ 460      .       DTC P1273, P1283 A/F SENSOR 1 ...................... 504           .
 Removal and Installation ..................................... 462     .        Component Description ....................................... 504 .
DTC P1148, P1168 CLOSED LOOP CONTROL ... 463                            .        CONSULT-II Reference Value in Data Monitor Mode
 On Board Diagnosis Logic .................................. 463        .                                                                          . 504
DTC P1211 TCS CONTROL UNIT ........................ 464                 .        On Board Diagnosis Logic ................................... 504  .
 Description .......................................................... 464
                                                                        .        DTC Confirmation Procedure .............................. 504     .
 On Board Diagnosis Logic .................................. 464        .        Wiring Diagram .................................................... 506
                                                                                                                                                   .
 DTC Confirmation Procedure .............................. 464          .        Diagnostic Procedure .......................................... 509
                                                                                                                                                   .
 Diagnostic Procedure .......................................... 464    .        Removal and Installation ..................................... 513.
DTC P1212 TCS COMMUNICATION LINE ........... 465                        .       DTC P1274, P1284 A/F SENSOR 1 ...................... 514           .
 Description .......................................................... 465
                                                                        .        Component Description ....................................... 514 .
 On Board Diagnosis Logic .................................. 465        .        CONSULT-II Reference Value in Data Monitor Mode
 DTC Confirmation Procedure .............................. 465          .                                                                          . 514
 Diagnostic Procedure .......................................... 465    .        On Board Diagnosis Logic ................................... 514  .
DTC P1217 ENGINE OVER TEMPERATURE ...... 466                            .        DTC Confirmation Procedure .............................. 514     .
 Description .......................................................... 466
                                                                        .        Wiring Diagram .................................................... 516
                                                                                                                                                   .

Revision: February 2006                                                   EC-5                                                           2005 Xterra
 Diagnostic Procedure .......................................... 519     .        Diagnostic Procedure ........................................... 575
                                                                                                                                                    .
 Removal and Installation ..................................... 523      .        Component Inspection ......................................... 577.
DTC P1276, P1286 A/F SENSOR 1 ....................... 524                .       DTC P1551, P1552 BATTERY CURRENT SENSOR.579
 Component Description ....................................... 524       .        Component Description ....................................... 579 .
 CONSULT-II Reference Value in Data Monitor Mode                                  CONSULT-II Reference Value in Data Monitor Mode
                                                                         . 524                                                                      .579
 On Board Diagnosis Logic ................................... 524        .        On Board Diagnosis Logic ................................... 579  .
 DTC Confirmation Procedure .............................. 524           .        DTC Confirmation Procedure ............................... 579    .
 Overall Function Check ....................................... 525      .        Wiring Diagram .................................................... 581
                                                                                                                                                    .
 Wiring Diagram .................................................... 527 .        Diagnostic Procedure ........................................... 582
                                                                                                                                                    .
 Diagnostic Procedure .......................................... 530     .        Component Inspection ......................................... 584.
 Removal and Installation ..................................... 533      .       DTC P1553 BATTERY CURRENT SENSOR ......... 586                     .
DTC P1278, P1288 A/F SENSOR 1 ....................... 534                .        Component Description ....................................... 586 .
 Component Description ....................................... 534       .        CONSULT-II Reference Value in Data Monitor Mode
 CONSULT-II Reference Value in Data Monitor Mode                                                                                                    .586
                                                                         . 534    On Board Diagnosis Logic ................................... 586  .
 On Board Diagnosis Logic ................................... 534        .        DTC Confirmation Procedure ............................... 586    .
 DTC Confirmation Procedure .............................. 535           .        Wiring Diagram .................................................... 588
                                                                                                                                                    .
 Wiring Diagram .................................................... 537 .        Diagnostic Procedure ........................................... 589
                                                                                                                                                    .
 Diagnostic Procedure .......................................... 540     .        Component Inspection ......................................... 591.
 Removal and Installation ..................................... 545      .       DTC P1554 BATTERY CURRENT SENSOR ......... 593                     .
DTC P1279, P1289 A/F SENSOR 1 ....................... 546                .        Component Description ....................................... 593 .
 Component Description ....................................... 546       .        CONSULT-II Reference Value in Data Monitor Mode
 CONSULT-II Reference Value in Data Monitor Mode                                                                                                    .593
                                                                         . 546    On Board Diagnosis Logic ................................... 593  .
 On Board Diagnosis Logic ................................... 546        .        Overall Function Check ........................................ 593
                                                                                                                                                    .
 DTC Confirmation Procedure .............................. 547           .        Wiring Diagram .................................................... 595
                                                                                                                                                    .
 Wiring Diagram .................................................... 549 .        Diagnostic Procedure ........................................... 596
                                                                                                                                                    .
 Diagnostic Procedure .......................................... 552     .        Component Inspection ......................................... 598.
 Removal and Installation ..................................... 557      .       DTC P1564 ASCD STEERING SWITCH ............... 600                 .
DTC P1444 EVAP CANISTER PURGE VOLUME                                              Component Description ....................................... 600 .
CONTROL SOLENOID VALVE .............................. 558                .        CONSULT-II Reference Value in Data Monitor Mode
 Description ........................................................... 558
                                                                         .                                                                          .600
 CONSULT-II Reference Value in Data Monitor Mode                                  On Board Diagnosis Logic ................................... 600  .
                                                                         . 558    DTC Confirmation Procedure ............................... 601    .
 On Board Diagnosis Logic ................................... 559        .        Wiring Diagram .................................................... 602
                                                                                                                                                    .
 DTC Confirmation Procedure .............................. 559           .        Diagnostic Procedure ........................................... 603
                                                                                                                                                    .
 Wiring Diagram .................................................... 560 .        Component Inspection ......................................... 606.
 Diagnostic Procedure .......................................... 562     .       DTC P1572 ASCD BRAKE SWITCH ..................... 607              .
 Component Inspection ......................................... 565      .        Component Description ....................................... 607 .
 Removal and Installation ..................................... 565      .        CONSULT-II Reference Value in Data Monitor Mode
DTC P1446 EVAP CANISTER VENT CONTROL                                                                                                                .607
VALVE .................................................................... 566
                                                                         .        On Board Diagnosis Logic ................................... 607  .
 Component Description ....................................... 566       .        DTC Confirmation Procedure ............................... 608    .
 CONSULT-II Reference Value in Data Monitor Mode                                  Wiring Diagram .................................................... 609
                                                                                                                                                    .
                                                                         . 566    Diagnostic Procedure ........................................... 610
                                                                                                                                                    .
 On Board Diagnosis Logic ................................... 566        .        Component Inspection ......................................... 618.
 DTC Confirmation Procedure .............................. 567           .       DTC P1574 ASCD VEHICLE SPEED SENSOR .... 620                       .
 Wiring Diagram .................................................... 568 .        Component Description ....................................... 620 .
 Diagnostic Procedure .......................................... 569     .        On Board Diagnosis Logic ................................... 620  .
 Component Inspection ......................................... 570      .        DTC Confirmation Procedure ............................... 620    .
DTC P1550 BATTERY CURRENT SENSOR ......... 572                           .        Diagnostic Procedure ........................................... 621
                                                                                                                                                    .
 Component Description ....................................... 572       .       DTC P1706 PNP SWITCH ...................................... 622    .
 CONSULT-II Reference Value in Data Monitor Mode                                  Component Description ....................................... 622 .
                                                                         . 572    CONSULT-II Reference Value in Data Monitor Mode
 On Board Diagnosis Logic ................................... 572        .                                                                          .622
 DTC Confirmation Procedure .............................. 572           .        On Board Diagnosis Logic ................................... 622  .
 Wiring Diagram .................................................... 574 .        DTC Confirmation Procedure ............................... 622    .
                                                                                  Overall Function Check ........................................ 623
                                                                                                                                                    .

Revision: February 2006                                                     EC-6                                                          2005 Xterra
 Wiring Diagram ................................................... 624
                                                                      .         Component Description ....................................... 659        .
 Diagnostic Procedure .......................................... 625  .         CONSULT-II Reference Value in Data Monitor Mode                                  A
DTC P1715 INPUT SPEED SENSOR (TURBINE                                                                                                                    . 659
REVOLUTION SENSOR) ...................................... 628         .         On Board Diagnosis Logic



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