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EC


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B ENGINE

                                                                                                                                                                        A




                                                                            ENGINE CONTROL SYSTEM
                                                                                                       SECTION                     EC                                   EC



                                                                                                                                                                        C



                                                                                                                                                                        D



                                                                                                                                                                        E
                                                                    CONTENTS
INDEX FOR DTC ....................................................... 9     .         Description ............................................................. 44
                                                                                                                                                               .        F
  DTC No. Index ........................................................ 9  .         Component Inspection ........................................... 44      .
  Alphabetical Index ................................................. 13   .        NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-
PRECAUTIONS ....................................................... 17      .        NATS) ....................................................................... 46
                                                                                                                                                               .        G
  Precautions for Supplemental Restraint System                                       Description ............................................................. 46
                                                                                                                                                               .
  (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                            ON BOARD DIAGNOSTIC (OBD) SYSTEM ........... 47                           .
  SIONER" ............................................................... 17.         Introduction ............................................................ 47
                                                                                                                                                               .
                                                                                                                                                                        H
  Precautions for Procedures without Cowl Top Cover 17                      ...       Two Trip Detection Logic ....................................... 47      .
  On Board Diagnostic (OBD) System of Engine and                                      Emission-related Diagnostic Information ............... 48               .
  A/T ......................................................................... 17
                                                                            .         Malfunction Indicator Lamp (MIL) .......................... 62           .
  Precaution ............................................................. 18
                                                                            .         OBD System Operation Chart ............................... 65            .         I
PREPARATION ........................................................ 21     .        BASIC SERVICE PROCEDURE .............................. 71                 .
  Special Service Tools ............................................ 21     .         Basic Inspection .................................................... 71 .
  Commercial Service Tools ..................................... 22         .         Idle Speed and Ignition Timing Check ................... 76              .        J
ENGINE CONTROL SYSTEM ................................. 23                  .         Procedure After Replacing ECM ........................... 77             .
  System Diagram .................................................... 23    .         VIN Registration .................................................... 77 .
  Multiport Fuel Injection (MFI) System ................... 24              .         Accelerator Pedal Released Position Learning ..... 78                    .
                                                                                                                                                                        K
  Electronic Ignition (EI) System .............................. 26         .         Throttle Valve Closed Position Learning ................ 78              .
  Fuel Cut Control (at No Load and High Engine                                        Idle Air Volume Learning ....................................... 78      .
  Speed) ................................................................... 27
                                                                            .         Fuel Pressure Check ............................................. 80     .
AIR CONDITIONING CUT CONTROL .................... 28                        .        TROUBLE DIAGNOSIS ........................................... 83          .        L
  Input/Output Signal Chart ...................................... 28       .         Trouble Diagnosis Introduction .............................. 83         .
  System Description ............................................... 28     .         DTC Inspection Priority Chart ................................ 89        .
AUTOMATIC SPEED CONTROL DEVICE (ASCD) 29                                    ...       Fail-Safe Chart ...................................................... 91.        M
  System Description ............................................... 29     .         Symptom Matrix Chart ........................................... 92      .
  Component Description ......................................... 30        .         Engine Control Component Parts Location ........... 96                   .
CAN COMMUNICATION ......................................... 31              .         Vacuum Hose Drawing ........................................ 103         .
  System Description ............................................... 31     .         Circuit Diagram .................................................... 104 .
EVAPORATIVE EMISSION SYSTEM ...................... 32                       .         ECM Harness Connector Terminal Layout .......... 106                     .
  Description ............................................................ 32
                                                                            .         ECM Terminals and Reference Value .................. 106                 .
  Component Inspection .......................................... 35        .         CONSULT-II Function (ENGINE) ......................... 115               .
  Removal and Installation ....................................... 36       .         Generic Scan Tool (GST) Function ...................... 128              .
  How to Detect Fuel Vapor Leakage ...................... 36                .         CONSULT-II Reference Value in Data Monitor .... 131                      .
ON BOARD REFUELING VAPOR RECOVERY                                                     Major Sensor Reference Graph in Data Monitor
(ORVR) ..................................................................... 39
                                                                            .         Mode .................................................................... 135
                                                                                                                                                               .
  System Description ............................................... 39     .        TROUBLE DIAGNOSIS - SPECIFICATION VALUE 137                               .
  Diagnostic Procedure ............................................ 40      .         Description ........................................................... 137
                                                                                                                                                               .
  Component Inspection .......................................... 42        .         Testing Condition ................................................. 137  .
POSITIVE CRANKCASE VENTILATION ................ 44                          .         Inspection Procedure ........................................... 137     .
                                                                                      Diagnostic Procedure .......................................... 138      .


Revision: September 2006                                                       EC-1                                                                 2007 Xterra
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-                                           Component Inspection ......................................... 188.
DENT ...................................................................... 147
                                                                          .        Removal and Installation ...................................... 188
                                                                                                                                                     .
 Description ........................................................... 147
                                                                          .       DTC P0101 MAF SENSOR .................................... 189      .
 Diagnostic Procedure .......................................... 147      .        Component Description ....................................... 189 .
POWER SUPPLY AND GROUND CIRCUIT .......... 148                            .        CONSULT-II Reference Value in Data Monitor Mode
 Wiring Diagram .................................................... 148  .                                                                          .189
 Diagnostic Procedure .......................................... 151      .        On Board Diagnosis Logic ................................... 189  .
 Ground Inspection ............................................... 155    .        DTC Confirmation Procedure ............................... 190    .
DTC U1000, U1001 CAN COMMUNICATION LINE. 156                                       Overall Function Check ........................................ 191
                                                                                                                                                     .
 Description ........................................................... 156
                                                                          .        Wiring Diagram .................................................... 192
                                                                                                                                                     .
 On Board Diagnosis Logic ................................... 156         .        Diagnostic Procedure ........................................... 193
                                                                                                                                                     .
 DTC Confirmation Procedure .............................. 156            .        Component Inspection ......................................... 195.
 Wiring Diagram .................................................... 157  .        Removal and Installation ...................................... 197
                                                                                                                                                     .
 Diagnostic Procedure .......................................... 158      .       DTC P0102, P0103 MAF SENSOR ........................ 198           .
DTC U1010 CAN COMMUNICATION .................... 159                      .        Component Description ....................................... 198 .
 Description ........................................................... 159
                                                                          .        CONSULT-II Reference Value in Data Monitor Mode
 On Board Diagnosis Logic ................................... 159         .                                                                          .198
 DTC Confirmation Procedure .............................. 159            .        On Board Diagnosis Logic ................................... 198  .
 Diagnostic Procedure .......................................... 160      .        DTC Confirmation Procedure ............................... 199    .
DTC P0011, P0021 IVT CONTROL ....................... 161                  .        Wiring Diagram .................................................... 200
                                                                                                                                                     .
 Description ........................................................... 161
                                                                          .        Diagnostic Procedure ........................................... 201
                                                                                                                                                     .
 CONSULT-II Reference Value in Data Monitor Mode                                   Component Inspection ......................................... 203.
                                                                          . 161    Removal and Installation ...................................... 204
                                                                                                                                                     .
 On Board Diagnosis Logic ................................... 162         .       DTC P0112, P0113 IAT SENSOR ........................... 205        .
 DTC Confirmation Procedure .............................. 162            .        Component Description ....................................... 205 .
 Diagnostic Procedure .......................................... 163      .        On Board Diagnosis Logic ................................... 205  .
 Component Inspection ......................................... 164       .        DTC Confirmation Procedure ............................... 205    .
 Removal and Installation ..................................... 164       .        Wiring Diagram .................................................... 207
                                                                                                                                                     .
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1                                        Diagnostic Procedure ........................................... 208
                                                                                                                                                     .
HEATER ................................................................. 165
                                                                          .        Component Inspection ......................................... 209.
 Description ........................................................... 165
                                                                          .        Removal and Installation ...................................... 209
                                                                                                                                                     .
 CONSULT-II Reference Value in Data Monitor Mode                                  DTC P0117, P0118 ECT SENSOR ......................... 210          .
                                                                          . 165    Component Description ....................................... 210 .
 On Board Diagnosis Logic ................................... 165         .        On Board Diagnosis Logic ................................... 210  .
 DTC Confirmation Procedure .............................. 165            .        DTC Confirmation Procedure ............................... 211    .
 Wiring Diagram .................................................... 167  .        Wiring Diagram .................................................... 212
                                                                                                                                                     .
 Diagnostic Procedure .......................................... 170      .        Diagnostic Procedure ........................................... 213
                                                                                                                                                     .
 Component Inspection ......................................... 172       .        Component Inspection ......................................... 214.
 Removal and Installation ..................................... 172       .        Removal and Installation ...................................... 214
                                                                                                                                                     .
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER 173                           .       DTC P0122, P0123 TP SENSOR ........................... 215         .
 Description ........................................................... 173
                                                                          .        Component Description ....................................... 215 .
 CONSULT-II Reference Value in Data Monitor Mode                                   CONSULT-II Reference Value in Data Monitor Mode
                                                                          . 173                                                                      .215
 On Board Diagnosis Logic ................................... 173         .        On Board Diagnosis Logic ................................... 215  .
 DTC Confirmation Procedure .............................. 174            .        DTC Confirmation Procedure ............................... 216    .
 Wiring Diagram .................................................... 175  .        Wiring Diagram .................................................... 217
                                                                                                                                                     .
 Diagnostic Procedure .......................................... 178      .        Diagnostic Procedure ........................................... 218
                                                                                                                                                     .
 Component Inspection ......................................... 180       .        Component Inspection ......................................... 221.
 Removal and Installation ..................................... 181       .        Removal and Installation ...................................... 221
                                                                                                                                                     .
DTC P0075, P0081 IVT CONTROL SOLENOID                                             DTC P0125 ECT SENSOR ..................................... 222     .
VALVE .................................................................... 182
                                                                          .        Component Description ....................................... 222 .
 Component Description ....................................... 182        .        On Board Diagnosis Logic ................................... 222  .
 CONSULT-II Reference Value in Data Monitor Mode                                   DTC Confirmation Procedure ............................... 223    .
                                                                          . 182    Diagnostic Procedure ........................................... 223
                                                                                                                                                     .
 On Board Diagnosis Logic ................................... 182         .        Component Inspection ......................................... 224.
 DTC Confirmation Procedure .............................. 182            .        Removal and Installation ...................................... 224
                                                                                                                                                     .
 Wiring Diagram .................................................... 183  .       DTC P0127 IAT SENSOR ....................................... 225   .
 Diagnostic Procedure .......................................... 187      .        Component Description ....................................... 225 .
                                                                                   On Board Diagnosis Logic ................................... 225  .

Revision: September 2006                                                     EC-2                                                          2007 Xterra
 DTC Confirmation Procedure .............................. 225    .        Component Description ....................................... 279   .
 Diagnostic Procedure .......................................... 226
                                                                  .        CONSULT-II Reference Value in Data Monitor Mode                             A
 Component Inspection ........................................ 227.                                                                            . 279
 Removal and Installation ..................................... 227
                                                                  .        On Board Diagnosis Logic ................................... 279    .
DTC P0128 THERMOSTAT FUNCTION ............... 228                 .        DTC Confirmation Procedure .............................. 280       .       EC
 On Board Diagnosis Logic .................................. 228  .        Overall Function Check ....................................... 281  .
 DTC Confirmation Procedure .............................. 228    .        Wiring Diagram .................................................... 282
                                                                                                                                               .
 Diagnostic Procedure .......................................... 228
                                                                  .        Diagnostic Procedure .......................................... 285 .
 Component Inspection ........................................ 229.        Component Inspection ......................................... 290  .       C
 Removal and Installation ..................................... 229
                                                                  .        Removal and Installation ..................................... 292  .
DTC P0130, P0150 A/F SENSOR 1 ...................... 230          .       DTC P0139, P0159 HO2S2 .................................... 293      .
 Component Description ....................................... 230.        Component Description ....................................... 293   .       D
 CONSULT-II Reference Value in Data Monitor Mode                           CONSULT-II Reference Value in Data Monitor Mode
                                                                  . 230                                                                        . 293
 On Board Diagnosis Logic .................................. 230  .        On Board Diagnosis Logic ................................... 293    .       E
 DTC Confirmation Procedure .............................. 230    .        DTC Confirmation Procedure .............................. 294       .
 Overall Function Check ....................................... 232
                                                                  .        Overall Function Check ....................................... 294  .
 Wiring Diagram ................................................... 233
                                                                  .        Wiring Diagram .................................................... 296
                                                                                                                                               .
 Diagnostic Procedure .......................................... 236
                                                                  .        Diagnostic Procedure .......................................... 299 .       F
 Removal and Installation ..................................... 238
                                                                  .        Component Inspection ......................................... 302  .
DTC P0131, P0151 A/F SENSOR 1 ...................... 239          .        Removal and Installation ..................................... 304  .
 Component Description ....................................... 239.       DTC P0171, P0174 FUEL INJECTION SYSTEM                                       G
 CONSULT-II Reference Value in Data Monitor Mode                          FUNCTION ............................................................. 305
                                                                                                                                               .
                                                                  . 239    On Board Diagnosis Logic ................................... 305    .
 On Board Diagnosis Logic .................................. 239  .        DTC Confirmation Procedure .............................. 305       .       H
 DTC Confirmation Procedure .............................. 239    .        Wiring Diagram .................................................... 307
                                                                                                                                               .
 Wiring Diagram ................................................... 241
                                                                  .        Diagnostic Procedure .......................................... 311 .
 Diagnostic Procedure .......................................... 244
                                                                  .       DTC P0172, P0175 FUEL INJECTION SYSTEM
                                                                                                                                                        I
 Removal and Installation ..................................... 246
                                                                  .       FUNCTION ............................................................. 317
                                                                                                                                               .
DTC P0132, P0152 A/F SENSOR 1 ...................... 247          .        On Board Diagnosis Logic ................................... 317    .
 Component Description ....................................... 247.        DTC Confirmation Procedure .............................. 317       .
 CONSULT-II Reference Value in Data Monitor Mode                           Wiring Diagram .................................................... 319
                                                                                                                                               .       J
                                                                  . 247    Diagnostic Procedure .......................................... 323 .
 On Board Diagnosis Logic .................................. 247  .       DTC P0181 FTT SENSOR ..................................... 328       .
 DTC Confirmation Procedure .............................. 247    .        Component Description ....................................... 328   .       K
 Wiring Diagram ................................................... 249
                                                                  .        On Board Diagnosis Logic ................................... 328    .
 Diagnostic Procedure .......................................... 252
                                                                  .        DTC Confirmation Procedure .............................. 328       .
 Removal and Installation ..................................... 254
                                                                  .        Wiring Diagram .................................................... 330
                                                                                                                                               .
                                                                                                                                                       L
DTC P0133, P0153 A/F SENSOR 1 ...................... 255          .        Diagnostic Procedure .......................................... 331 .
 Component Description ....................................... 255.        Component Inspection ......................................... 332  .
 CONSULT-II Reference Value in Data Monitor Mode                           Removal and Installation ..................................... 332  .
                                                                  . 255   DTC P0182, P0183 FTT SENSOR ......................... 333            .       M
 On Board Diagnosis Logic .................................. 255  .        Component Description ....................................... 333   .
 DTC Confirmation Procedure .............................. 256    .        On Board Diagnosis Logic ................................... 333    .
 Wiring Diagram ................................................... 258
                                                                  .        DTC Confirmation Procedure .............................. 333       .
 Diagnostic Procedure .......................................... 261
                                                                  .        Wiring Diagram .................................................... 334
                                                                                                                                               .
 Removal and Installation ..................................... 266
                                                                  .        Diagnostic Procedure .......................................... 335 .
DTC P0137, P0157 HO2S2 ................................... 267    .        Component Inspection ......................................... 336  .
 Component Description ....................................... 267.        Removal and Installation ..................................... 336  .
 CONSULT-II Reference Value in Data Monitor Mode                          DTC P0222, P0223 TP SENSOR ........................... 337           .
                                                                  . 267    Component Description ....................................... 337   .
 On Board Diagnosis Logic .................................. 267  .        CONSULT-II Reference Value in Data Monitor Mode
 DTC Confirmation Procedure .............................. 268    .                                                                            . 337
 Overall Function Check ....................................... 268
                                                                  .        On Board Diagnosis Logic ................................... 337    .
 Wiring Diagram ................................................... 270
                                                                  .        DTC Confirmation Procedure .............................. 338       .
 Diagnostic Procedure .......................................... 273
                                                                  .        Wiring Diagram .................................................... 339
                                                                                                                                               .
 Component Inspection ........................................ 276.        Diagnostic Procedure .......................................... 340 .
 Removal and Installation ..................................... 278
                                                                  .        Component Inspection ......................................... 343  .
DTC P0138, P0158 HO2S2 ................................... 279    .        Removal and Installation ..................................... 343  .

Revision: September 2006                                             EC-3                                                           2007 Xterra
DTC P0300 - P0306 MULTIPLE CYLINDER MIS-                                            Component Inspection ......................................... 400       .
FIRE, NO. 1 - 6 CYLINDER MISFIRE .................... 344                  .        Removal and Installation ...................................... 400      .
  On Board Diagnosis Logic ................................... 344         .       DTC P0444, P0445 EVAP CANISTER PURGE VOL-
  DTC Confirmation Procedure .............................. 344            .       UME CONTROL SOLENOID VALVE ..................... 401                      .
  Diagnostic Procedure .......................................... 345      .        Description ........................................................... 401
                                                                                                                                                             .
DTC P0327, P0328, P0332, P0333 KS .................. 352                   .        CONSULT-II Reference Value in Data Monitor Mode
  Component Description ....................................... 352        .                                                                                 .401
  On Board Diagnosis Logic ................................... 352         .        On Board Diagnosis Logic ................................... 402         .
  DTC Confirmation Procedure .............................. 352            .        DTC Confirmation Procedure ............................... 402           .
  Wiring Diagram .................................................... 353  .        Wiring Diagram .................................................... 403  .
  Diagnostic Procedure .......................................... 354      .        Diagnostic Procedure ........................................... 405     .
  Component Inspection ......................................... 356       .        Component Inspection ......................................... 406       .
  Removal and Installation ..................................... 356       .        Removal and Installation ...................................... 407      .
DTC P0335 CKP SENSOR (POS) ......................... 357                   .       DTC P0447 EVAP CANISTER VENT CONTROL
  Component Description ....................................... 357        .       VALVE ..................................................................... 408
                                                                                                                                                             .
  CONSULT-II Reference Value in Data Monitor Mode                                   Component Description ....................................... 408        .
                                                                           . 357    CONSULT-II Reference Value in Data Monitor Mode
  On Board Diagnosis Logic ................................... 357         .                                                                                 .408
  DTC Confirmation Procedure .............................. 358            .        On Board Diagnosis Logic ................................... 408         .
  Wiring Diagram .................................................... 359  .        DTC Confirmation Procedure ............................... 409           .
  Diagnostic Procedure .......................................... 360      .        Wiring Diagram .................................................... 410  .
  Component Inspection ......................................... 363       .        Diagnostic Procedure ........................................... 411     .
  Removal and Installation ..................................... 363       .        Component Inspection ......................................... 413       .
DTC P0340, P0345 CMP SENSOR (PHASE) ........ 364                           .       DTC P0448 EVAP CANISTER VENT CONTROL
  Component Description ....................................... 364        .       VALVE ..................................................................... 415
                                                                                                                                                             .
  CONSULT-II Reference Value in Data Monitor Mode                                   Component Description ....................................... 415        .
                                                                           . 364    CONSULT-II Reference Value in Data Monitor Mode
  On Board Diagnosis Logic ................................... 364         .                                                                                 .415
  DTC Confirmation Procedure .............................. 365            .        On Board Diagnosis Logic ................................... 415         .
  Wiring Diagram .................................................... 366  .        DTC Confirmation Procedure ............................... 416           .
  Diagnostic Procedure .......................................... 369      .        Wiring Diagram .................................................... 417  .
  Component Inspection ......................................... 372       .        Diagnostic Procedure ........................................... 418     .
  Removal and Installation ..................................... 372       .        Component Inspection ......................................... 419       .
DTC P0420, P0430 THREE WAY CATALYST FUNC-                                          DTC P0451 EVAP CONTROL SYSTEM PRESSURE
TION ....................................................................... 373
                                                                           .       SENSOR ................................................................. 421
                                                                                                                                                             .
  On Board Diagnosis Logic ................................... 373         .        Component Description ....................................... 421        .
  DTC Confirmation Procedure .............................. 373            .        CONSULT-II Reference Value in Data Monitor Mode
  Overall Function Check ....................................... 374       .                                                                                 .421
  Diagnostic Procedure .......................................... 375      .        On Board Diagnosis Logic ................................... 421         .
DTC P0441 EVAP CONTROL SYSTEM ................ 379                         .        DTC Confirmation Procedure ............................... 422           .
  System Description .............................................. 379    .        Diagnostic Procedure ........................................... 422     .
  On Board Diagnosis Logic ................................... 379         .        Component Inspection ......................................... 423       .
  DTC Confirmation Procedure .............................. 380            .       DTC P0452 EVAP CONTROL SYSTEM PRESSURE
  Overall Function Check ....................................... 380       .       SENSOR ................................................................. 424
                                                                                                                                                             .
  Diagnostic Procedure .......................................... 381      .        Component Description ....................................... 424        .
DTC P0442 EVAP CONTROL SYSTEM ................ 385                         .        CONSULT-II Reference Value in Data Monitor Mode
  On Board Diagnosis Logic ................................... 385         .                                                                                 .424
  DTC Confirmation Procedure .............................. 386            .        On Board Diagnosis Logic ................................... 424         .
  Diagnostic Procedure .......................................... 387      .        DTC Confirmation Procedure ............................... 425           .
DTC P0443 EVAP CANISTER PURGE VOLUME                                                Wiring Diagram .................................................... 426  .
CONTROL SOLENOID VALVE .............................. 393                  .        Diagnostic Procedure ........................................... 427     .
  Description ........................................................... 393
                                                                           .        Component Inspection ......................................... 429       .
  CONSULT-II Reference Value in Data Monitor Mode                                  DTC P0453 EVAP CONTROL SYSTEM PRESSURE
                                                                           . 393   SENSOR ................................................................. 430
                                                                                                                                                             .
  On Board Diagnosis Logic ................................... 394         .        Component Description ....................................... 430        .
  DTC Confirmation Procedure .............................. 394            .        CONSULT-II Reference Value in Data Monitor Mode
  Wiring Diagram .................................................... 395  .                                                                                 .430
  Diagnostic Procedure .......................................... 397      .        On Board Diagnosis Logic ................................... 430         .
                                                                                    DTC Confirmation Procedure ............................... 431           .

Revision: September 2006                                                      EC-4                                                                2007 Xterra
 Wiring Diagram ................................................... 432
                                                                      .        DTC Confirmation Procedure .............................. 471         .
 Diagnostic Procedure .......................................... 433  .        Wiring Diagram .................................................... 472
                                                                                                                                                     .       A
 Component Inspection ........................................ 437    .        Diagnostic Procedure .......................................... 473   .
DTC P0455 EVAP CONTROL SYSTEM ............... 438                     .       DTC P0605 ECM .................................................... 475 .
 On Board Diagnosis Logic .................................. 438      .        Component Description ....................................... 475     .       EC
 DTC Confirmation Procedure .............................. 439        .        On Board Diagnosis Logic ................................... 475      .
 Diagnostic Procedure .......................................... 440  .        DTC Confirmation Procedure .............................. 475         .
DTC P0456 EVAP CONTROL SYSTEM ............... 445                     .        Diagnostic Procedure .......................................... 476   .
 On Board Diagnosis Logic .................................. 445      .       DTC P0643 SENSOR POWER SUPPLY ............... 478                      .       C
 DTC Confirmation Procedure .............................. 446        .        On Board Diagnosis Logic ................................... 478      .
 Overall Function Check ....................................... 447   .        DTC Confirmation Procedure .............................. 478         .
 Diagnostic Procedure .......................................... 448  .        Wiring Diagram .................................................... 479
                                                                                                                                                     .       D
DTC P0460 FUEL LEVEL SENSOR ..................... 454                 .        Diagnostic Procedure .......................................... 481   .
 Component Description ....................................... 454    .       DTC P0850 PNP SWITCH ..................................... 483         .
 On Board Diagnosis Logic .................................. 454      .        Component Description ....................................... 483     .       E
 DTC Confirmation Procedure .............................. 454        .        CONSULT-II Reference Value in Data Monitor Mode
 Diagnostic Procedure .......................................... 455  .                                                                              . 483
 Removal and Installation ..................................... 455   .        On Board Diagnosis Logic ................................... 483      .
DTC P0461 FUEL LEVEL SENSOR ..................... 456                 .        DTC Confirmation Procedure .............................. 483         .       F
 Component Description ....................................... 456    .        Overall Function Check ....................................... 484    .
 On Board Diagnosis Logic .................................. 456      .        Wiring Diagram .................................................... 485
                                                                                                                                                     .
 Overall Function Check ....................................... 456   .        Diagnostic Procedure .......................................... 486   .       G
 Diagnostic Procedure .......................................... 457  .       DTC P1148, P1168 CLOSED LOOP CONTROL ... 489                           .
 Removal and Installation ..................................... 457   .        On Board Diagnosis Logic ................................... 489      .
DTC P0462, P0463 FUEL LEVEL SENSOR ......... 458                      .       DTC P1211 TCS CONTROL UNIT ......................... 490               .       H
 Component Description ....................................... 458    .        Description ........................................................... 490
                                                                                                                                                     .
 On Board Diagnosis Logic .................................. 458      .        On Board Diagnosis Logic ................................... 490      .
 DTC Confirmation Procedure .............................. 458        .        DTC Confirmation Procedure .............................. 490         .
                                                                                                                                                              I
 Diagnostic Procedure .......................................... 459  .        Diagnostic Procedure .......................................... 490   .
 Removal and Installation ..................................... 459   .       DTC P1212 TCS COMMUNICATION LINE ........... 491                       .
DTC P0500 VSS .................................................... 460.        Description ........................................................... 491
                                                                                                                                                     .
 Description .......................................................... 460
                                                                      .        On Board Diagnosis Logic ................................... 491      .       J
 On Board Diagnosis Logic .................................. 460      .        DTC Confirmation Procedure .............................. 491         .
 DTC Confirmation Procedure .............................. 460        .        Diagnostic Procedure .......................................... 491   .
 Overall Function Check ....................................... 461   .       DTC P1217 ENGINE OVER TEMPERATURE ....... 492                          .       K
 Diagnostic Procedure .......................................... 461  .        Description ........................................................... 492
                                                                                                                                                     .
DTC P0506 ISC SYSTEM ...................................... 462       .        CONSULT-II Reference Value in Data Monitor Mode
 Description .......................................................... 462
                                                                      .                                                                              . 493
                                                                                                                                                             L
 On Board Diagnosis Logic .................................. 462      .        On Board Diagnosis Logic ................................... 494      .
 DTC Confirmation Procedure .............................. 462        .        Overall Function Check ....................................... 494    .
 Diagnostic Procedure .......................................... 463  .        Wiring Diagram .................................................... 496
                                                                                                                                                     .
DTC P0507 ISC SYSTEM ...................................... 464       .        Diagnostic Procedure .......................................... 498   .       M
 Description .......................................................... 464
                                                                      .        Main 12 Causes of Overheating .......................... 502          .
 On Board Diagnosis Logic .................................. 464      .        Component Inspection ......................................... 502    .
 DTC Confirmation Procedure .............................. 464        .       DTC P1225 TP SENSOR ....................................... 503        .
 Diagnostic Procedure .......................................... 465  .        Component Description ....................................... 503     .
DTC P0550 PSP SENSOR .................................... 466         .        On Board Diagnosis Logic ................................... 503      .
 Component Description ....................................... 466    .        DTC Confirmation Procedure .............................. 503         .
 CONSULT-II Reference Value in Data Monitor Mode                               Diagnostic Procedure .......................................... 504   .
                                                                      . 466    Removal and Installation ..................................... 504    .
 On Board Diagnosis Logic .................................. 466      .       DTC P1226 TP SENSOR ....................................... 505        .
 DTC Confirmation Procedure .............................. 466        .        Component Description ....................................... 505     .
 Wiring Diagram ................................................... 467
                                                                      .        On Board Diagnosis Logic ................................... 505      .
 Diagnostic Procedure .......................................... 468  .        DTC Confirmation Procedure .............................. 505         .
 Component Inspection ........................................ 470    .        Diagnostic Procedure .......................................... 506   .
 Removal and Installation ..................................... 470   .        Removal and Installation ..................................... 506    .
DTC P0603 ECM POWER SUPPLY ...................... 471                 .       DTC P1421 COLD START CONTROL .................. 507                    .
 Component Description ....................................... 471    .        Description ........................................................... 507
                                                                                                                                                     .
 On Board Diagnosis Logic .................................. 471      .        On Board Diagnosis Logic ................................... 507      .

Revision: September 2006                                                 EC-5                                                             2007 Xterra
 DTC Confirmation Procedure .............................. 507     .        DTC Confirmation Procedure ............................... 557          .
 Diagnostic Procedure .......................................... 507
                                                                   .        Diagnostic Procedure ........................................... 558    .
DTC P1550 BATTERY CURRENT SENSOR ......... 509                     .       DTC P1715 INPUT SPEED SENSOR (TURBINE
 Component Description ....................................... 509 .       REVOLUTION SENSOR) ....................................... 559           .
 CONSULT-II Reference Value in Data Monitor Mode                            Description ........................................................... 559
                                                                                                                                                    .
                                                                   . 509    CONSULT-II Reference Value in Data Monitor Mode
 On Board Diagnosis Logic ................................... 509  .                                                                                .559
 DTC Confirmation Procedure .............................. 509     .        On Board Diagnosis Logic ................................... 559        .
 Wiring Diagram .................................................... 511
                                                                   .        Diagnostic Procedure ........................................... 559    .
 Diagnostic Procedure .......................................... 512
                                                                   .       DTC P1800 VIAS CONTROL SOLENOID VALVE . 560
 Component Inspection ......................................... 514.        Component Description ....................................... 560       .
DTC P1551, P1552 BATTERY CURRENT SENSOR 516                        .        CONSULT-II Reference Value in Data Monitor Mode
 Component Description ....................................... 516 .                                                                                .560
 CONSULT-II Reference Value in Data Monitor Mode                            On Board Diagnosis Logic ................................... 560        .
                                                                   . 516    DTC Confirmation Procedure ............................... 560          .
 On Board Diagnosis Logic ................................... 516  .        Wiring Diagram .................................................... 561 .
 DTC Confirmation Procedure .............................. 516     .        Diagnostic Procedure ........................................... 562    .
 Wiring Diagram .................................................... 518
                                                                   .        Component Inspection ......................................... 563      .
 Diagnostic Procedure .......................................... 519
                                                                   .        Removal and Installation ...................................... 564     .
 Component Inspection ......................................... 521.       DTC P1805 BRAKE SWITCH ................................ 565              .
DTC P1553 BATTERY CURRENT SENSOR ......... 523                     .        Description ........................................................... 565
                                                                                                                                                    .
 Component Description ....................................... 523 .        CONSULT-II Reference Value in Data Monitor Mode
 CONSULT-II Reference Value in Data Monitor Mode                                                                                                    .565
                                                                   . 523    On Board Diagnosis Logic ................................... 565        .
 On Board Diagnosis Logic ................................... 523  .        DTC Confirmation Procedure ............................... 565          .
 DTC Confirmation Procedure .............................. 523     .        Wiring Diagram .................................................... 566 .
 Wiring Diagram .................................................... 525
                                                                   .        Diagnostic Procedure ........................................... 567    .
 Diagnostic Procedure .......................................... 526
                                                                   .        Component Inspection ......................................... 569      .
 Component Inspection ......................................... 528.       DTC P2100, P2103 THROTTLE CONTROL MOTOR
DTC P1554 BATTERY CURRENT SENSOR ......... 530                     .       RELAY .................................................................... 570
                                                                                                                                                    .
 Component Description ....................................... 530 .        Component Description ....................................... 570       .
 CONSULT-II Reference Value in Data Monitor Mode                            CONSULT-II Reference Value in Data Monitor Mode
                                                                   . 530                                                                            .570
 On Board Diagnosis Logic ................................... 530  .        On Board Diagnosis Logic ................................... 570        .
 Overall Function Check ....................................... 530.        DTC Confirmation Procedure ............................... 570          .
 Wiring Diagram .................................................... 532
                                                                   .        Wiring Diagram .................................................... 572 .
 Diagnostic Procedure .......................................... 533
                                                                   .        Diagnostic Procedure ........................................... 573    .
 Component Inspection ......................................... 535.       DTC P2101 ELECTRIC THROTTLE CONTROL
DTC P1564 ASCD STEERING SWITCH ............... 537                 .       FUNCTION ............................................................. 576
                                                                                                                                                    .
 Component Description ....................................... 537 .        Description ........................................................... 576
                                                                                                                                                    .
 CONSULT-II Reference Value in Data Monitor Mode                            On Board Diagnosis Logic ................................... 576        .
                                                                   . 537    DTC Confirmation Procedure ............................... 576          .
 On Board Diagnosis Logic ................................... 537  .        Wiring Diagram .................................................... 577 .
 DTC Confirmation Procedure .............................. 538     .        Diagnostic Procedure ........................................... 578    .
 Wiring Diagram .................................................... 539
                                                                   .        Component Inspection ......................................... 581      .
 Diagnostic Procedure .......................................... 540
                                                                   .        Removal and Installation ...................................... 581     .
 Component Inspection ......................................... 543.       DTC P2118 THROTTLE CONTROL MOTOR ........ 582                            .
DTC P1572 ASCD BRAKE SWITCH ..................... 544              .        Component Description ....................................... 582       .
 Component Description ....................................... 544 .        On Board Diagnosis Logic ................................... 582        .
 CONSULT-II Reference Value in Data Monitor Mode                            DTC Confirmation Procedure ............................... 582          .
                                                                   . 544    Wiring Diagram .................................................... 583 .
 On Board Diagnosis Logic ................................... 544  .        Diagnostic Procedure ........................................... 584    .
 DTC Confirmation Procedure .............................. 545     .        Component Inspection ......................................... 585      .
 Wiring Diagram .................................................... 546
                                                                   .        Removal and Installation ...................................... 586     .
 Diagnostic Procedure .......................................... 547
                                                                   .       DTC P2119 ELECTRIC THROTTLE CONTROL
 Component Inspection ......................................... 555.       ACTUATOR ............................................................ 587.
DTC P1574 ASCD VEHICLE SPEED SENSOR .... 557                       .        Component Description ....................................... 587       .
 Component Description ....................................... 557 .        On Board Diagnosis Logic ................................... 587        .
 On Board Diagnosis Logic ................................... 557  .

Revision: September 2006                                              EC-6                                                               2007 Xterra
 DTC Confirmation Procedure .............................. 587    .         Component Description .......



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