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ENGINE CONTROL SYSTEM


B ENGINE

                                                                                                                                                                       A




                                                                           ENGINE CONTROL SYSTEM
                                                                                                       SECTION                    EC                                   EC



                                                                                                                                                                       C


                                                                                                                                                                       D


                                                                                                                                                                       E
                                                                    CONTENTS
INDEX FOR DTC ....................................................... 8     .        TROUBLE DIAGNOSIS ........................................... 75          .       F
  Alphabetical Index ................................................... 8  .         Trouble Diagnosis Introduction .............................. 75         .
  DTC No. Index ...................................................... 12   .         DTC Inspection Priority Chart ................................ 78        .
PRECAUTIONS ....................................................... 16      .         Fail-Safe Chart ...................................................... 80.       G
  Precautions for Supplemental Restraint System                                       Basic Inspection .................................................... 81 .
  (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                             Symptom Matrix Chart ........................................... 86      .
  SIONER" ............................................................... 16.         Engine Control Component Parts Location ........... 90                   .
                                                                                                                                                                       H
  Precautions for Battery Service ............................. 16          .         Circuit Diagram ...................................................... 96.
  On Board Diagnostic (OBD) System of Engine and                                      ECM Harness Connector Terminal Layout ............ 98                    .
  A/T ......................................................................... 16
                                                                            .         ECM Terminals and Reference Value .................... 98                .
  Precaution ............................................................. 17
                                                                            .         CONSULT-II Function .......................................... 107       .        I
  Wiring Diagrams and Trouble Diagnosis ............... 19                  .         Generic Scan Tool (GST) Function ...................... 119              .
PREPARATION ........................................................ 20     .         CONSULT-II Reference Value in Data Monitor Mode
  Special Service Tools ............................................ 20     .                                                                                  . 122   J
  Commercial Service Tools ..................................... 21         .         Major Sensor Reference Graph in Data Monitor
ENGINE CONTROL SYSTEM ................................. 22                  .         Mode .................................................................... 125
                                                                                                                                                               .
  System Diagram .................................................... 22    .        TROUBLE DIAGNOSIS - SPECIFICATION VALUE 128                               .
                                                                                                                                                                       K
  Vacuum Hose Drawing .......................................... 23         .         Description ........................................................... 128
                                                                                                                                                               .
  System Chart ........................................................ 24  .         Testing Condition ................................................. 128  .
  Multiport Fuel Injection (MFI) System ................... 25              .         Inspection Procedure ........................................... 128     .
  Electronic Ignition (EI) System .............................. 27         .         Diagnostic Procedure .......................................... 129      .       L
  Air Conditioning Cut Control .................................. 28        .        TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
  Fuel Cut Control (at No Load and High Engine                                       DENT ...................................................................... 132
                                                                                                                                                               .
  Speed) ................................................................... 28
                                                                            .         Description ........................................................... 132
                                                                                                                                                               .       M
  CAN communication ............................................. 29        .         Diagnostic Procedure .......................................... 132      .
BASIC SERVICE PROCEDURE ............................. 34                    .        POWER SUPPLY CIRCUIT FOR ECM .................. 133                       .
  Idle Speed and Ignition Timing Check ................... 34               .         Wiring Diagram .................................................... 133  .
  Idle Speed/Ignition Timing/Idle Mixture Ratio                                       Diagnostic Procedure .......................................... 136      .
  Adjustment ............................................................ 35.        DTC U1000, U1001 CAN COMMUNICATION LINE. 140
  Accelerator Pedal Released Position Learning ..... 46                     .         Description ........................................................... 140
                                                                                                                                                               .
  Throttle Valve Closed Position Learning ............... 46                .         On Board Diagnosis Logic ................................... 140         .
  Idle Air Volume Learning ....................................... 46       .         DTC Confirmation Procedure .............................. 140            .
  Fuel Pressure Check ............................................. 48      .         Wiring Diagram .................................................... 141  .
ON BOARD DIAGNOSTIC (OBD) SYSTEM ........... 50                             .         Diagnostic Procedure .......................................... 142      .
  Introduction ........................................................... 50
                                                                            .        DTC P0011, P0021 IVT CONTROL ....................... 143                  .
  Two Trip Detection Logic ....................................... 50       .         Description ........................................................... 143
                                                                                                                                                               .
  Emission-Related Diagnostic Information ............. 51                  .         CONSULT-II Reference Value in Data Monitor Mode
  IVIS (Infiniti Vehicle Immobilizer System -- NATS) 66                     ...                                                                                . 143
  Malfunction Indicator Lamp (MIL) .......................... 66            .         On Board Diagnosis Logic ................................... 144         .
  OBD System Operation Chart ............................... 70             .


Revision; 2004 April                                                           EC-1                                                        2003 G35 Coupe
 DTC Confirmation Procedure .............................. 144         .       DTC P0122, P0123 TP SENSOR ........................... 187         .
 Diagnostic Procedure .......................................... 145   .        Component Description ....................................... 187 .
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER 146                        .        CONSULT-II Reference Value in Data Monitor Mode
 Description ........................................................... 146
                                                                       .                                                                          .187
 CONSULT-II Reference Value in Data Monitor Mode                                On Board Diagnosis Logic ................................... 187  .
                                                                       . 146    DTC Confirmation Procedure ............................... 188    .
 On Board Diagnosis Logic ................................... 146      .        Wiring Diagram .................................................... 189
                                                                                                                                                  .
 DTC Confirmation Procedure .............................. 147         .        Diagnostic Procedure ........................................... 190
                                                                                                                                                  .
 Wiring Diagram .................................................... 148
                                                                       .        Component Inspection ......................................... 193.
 Diagnostic Procedure .......................................... 151   .        Removal and Installation ...................................... 193
                                                                                                                                                  .
 Component Inspection ......................................... 153    .       DTC P0125 ECT SENSOR ..................................... 194     .
 Removal and Installation ..................................... 153    .        Component Description ....................................... 194 .
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER 154                        .        On Board Diagnosis Logic ................................... 194  .
 Description ........................................................... 154
                                                                       .        DTC Confirmation Procedure ............................... 195    .
 CONSULT-II Reference Value in Data Monitor Mode                                Diagnostic Procedure ........................................... 195
                                                                                                                                                  .
                                                                       . 154    Component Inspection ......................................... 196.
 On Board Diagnosis Logic ................................... 154      .        Removal and Installation ...................................... 196
                                                                                                                                                  .
 DTC Confirmation Procedure .............................. 155         .       DTC P0127 IAT SENSOR ....................................... 197   .
 Wiring Diagram .................................................... 156
                                                                       .        Component Description ....................................... 197 .
 Diagnostic Procedure .......................................... 159   .        On Board Diagnosis Logic ................................... 197  .
 Component Inspection ......................................... 161    .        DTC Confirmation Procedure ............................... 197    .
 Removal and Installation ..................................... 161    .        Diagnostic Procedure ........................................... 198
                                                                                                                                                  .
DTC P0101 MAF SENSOR .................................... 162          .        Component Inspection ......................................... 198.
 Component Description ....................................... 162     .        Removal and Installation ...................................... 199
                                                                                                                                                  .
 CONSULT-II Reference Value in Data Monitor Mode                               DTC P0128 THERMOSTAT FUNCTION ................ 200                 .
                                                                       . 162    On Board Diagnosis Logic ................................... 200  .
 On Board Diagnosis Logic ................................... 162      .        DTC Confirmation Procedure ............................... 200    .
 DTC Confirmation Procedure .............................. 163         .        Diagnostic Procedure ........................................... 200
                                                                                                                                                  .
 Overall Function Check ....................................... 164    .        Component Inspection ......................................... 201.
 Wiring Diagram .................................................... 165
                                                                       .        Removal and Installation ...................................... 201
                                                                                                                                                  .
 Diagnostic Procedure .......................................... 166   .       DTC P0132, P0152 HO2S1 .................................... 202    .
 Component Inspection ......................................... 169    .        Component Description ....................................... 202 .
 Removal and Installation ..................................... 169    .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0102, P0103 MAF SENSOR ........................ 170               .                                                                          .202
 Component Description ....................................... 170     .        On Board Diagnosis Logic ................................... 202  .
 CONSULT-II Reference Value in Data Monitor Mode                                DTC Confirmation Procedure ............................... 203    .
                                                                       . 170    Wiring Diagram .................................................... 204
                                                                                                                                                  .
 On Board Diagnosis Logic ................................... 170      .        Diagnostic Procedure ........................................... 207
                                                                                                                                                  .
 DTC Confirmation Procedure .............................. 171         .        Component Inspection ......................................... 210.
 Wiring Diagram .................................................... 172
                                                                       .        Removal and Installation ...................................... 211
                                                                                                                                                  .
 Diagnostic Procedure .......................................... 173   .       DTC P0133, P0153 HO2S1 .................................... 212    .
 Component Inspection ......................................... 176    .        Component Description ....................................... 212 .
 Removal and Installation ..................................... 176    .        CONSULT-II Reference Value in Data Monitor Mode
DTC P0112, P0113 IAT SENSOR .......................... 177             .                                                                          .212
 Component Description ....................................... 177     .        On Board Diagnosis Logic ................................... 212  .
 On Board Diagnosis Logic ................................... 177      .        DTC Confirmation Procedure ............................... 213    .
 DTC Confirmation Procedure .............................. 177         .        Overall Function Check ........................................ 214
                                                                                                                                                  .
 Wiring Diagram .................................................... 179
                                                                       .        Wiring Diagram .................................................... 215
                                                                                                                                                  .
 Diagnostic Procedure .......................................... 180   .        Diagnostic Procedure ........................................... 218
                                                                                                                                                  .
 Component Inspection ......................................... 181    .        Component Inspection ......................................... 223.
 Removal and Installation ..................................... 181    .        Removal and Installation ...................................... 224
                                                                                                                                                  .
DTC P0117, P0118 ECT SENSOR ......................... 182              .       DTC P0134, P0154 HO2S1 .................................... 225    .
 Component Description ....................................... 182     .        Component Description ....................................... 225 .
 On Board Diagnosis Logic ................................... 182      .        CONSULT-II Reference Value in Data Monitor Mode
 DTC Confirmation Procedure .............................. 183         .                                                                          .225
 Wiring Diagram .................................................... 184
                                                                       .        On Board Diagnosis Logic ................................... 225  .
 Diagnostic Procedure .......................................... 185   .        DTC Confirmation Procedure ............................... 226    .
 Component Inspection ......................................... 186    .        Overall Function Check ........................................ 227
                                                                                                                                                  .
 Removal and Installation ..................................... 186    .        Wiring Diagram .................................................... 228
                                                                                                                                                  .

Revision; 2004 April                                                      EC-2                                                   2003 G35 Coupe
 Diagnostic Procedure .......................................... 231 .         Diagnostic Procedure .......................................... 286      .
 Component Inspection ........................................ 232   .         Component Inspection ......................................... 289       .       A
 Removal and Installation ..................................... 234  .         Removal and Installation ..................................... 289       .
DTC P0138, P0158 HO2S2 ................................... 235       .       DTC P0300 - P0306 MULTIPLE CYLINDER MIS-
 Component Description ....................................... 235   .       FIRE, NO. 1 - 6 CYLINDER MISFIRE .................... 290                  .       EC
 CONSULT-II Reference Value in Data Monitor Mode                               On Board Diagnosis Logic ................................... 290         .
                                                                     . 235     DTC Confirmation Procedure .............................. 290            .
 On Board Diagnosis Logic .................................. 235     .         Diagnostic Procedure .......................................... 291      .
 DTC Confirmation Procedure .............................. 236       .       DTC P0327, P0328 KS .......................................... 296         .       C
 Wiring Diagram ................................................... 237
                                                                     .         Component Description ....................................... 296        .
 Diagnostic Procedure .......................................... 240 .         On Board Diagnosis Logic ................................... 296         .
 Component Inspection ........................................ 243   .         DTC Confirmation Procedure .............................. 296            .       D
 Removal and Installation ..................................... 244  .         Wiring Diagram .................................................... 297  .
DTC P0139, P0159 HO2S2 ................................... 245       .         Diagnostic Procedure .......................................... 298      .
 Component Description ....................................... 245   .         Component Inspection ......................................... 299       .       E
 CONSULT-II Reference Value in Data Monitor Mode                               Removal and Installation ..................................... 300       .
                                                                     . 245   DTC P0335 CKP SENSOR (POS) ......................... 301                   .
 On Board Diagnosis Logic .................................. 245     .         Component Description ....................................... 301        .
 DTC Confirmation Procedure .............................. 246       .         CONSULT-II Reference Value in Data Monitor Mode                                  F
 Overall Function Check ....................................... 246  .                                                                                  . 301
 Wiring Diagram ................................................... 248
                                                                     .         On Board Diagnosis Logic ................................... 301         .
 Diagnostic Procedure .......................................... 251 .         DTC Confirmation Procedure .............................. 301            .       G
 Component Inspection ........................................ 254   .         Wiring Diagram .................................................... 302  .
 Removal and Installation ..................................... 256  .         Diagnostic Procedure .......................................... 303      .
DTC P0171, P0174 FUEL INJECTION SYSTEM                                         Component Inspection ......................................... 306       .       H
FUNCTION ............................................................. 257
                                                                     .         Removal and Installation ..................................... 306       .
 On Board Diagnosis Logic .................................. 257     .       DTC P0340, P0345 CMP SENSOR (PHASE) ....... 307                            .
 DTC Confirmation Procedure .............................. 257       .         Component Description ....................................... 307        .
                                                                                                                                                                 I
 Wiring Diagram ................................................... 259
                                                                     .         CONSULT-II Reference Value in Data Monitor Mode
 Diagnostic Procedure .......................................... 261 .                                                                                  . 307
DTC P0172, P0175 FUEL INJECTION SYSTEM                                         On Board Diagnosis Logic ................................... 307         .
FUNCTION ............................................................. 266
                                                                     .         DTC Confirmation Procedure .............................. 307            .       J
 On Board Diagnosis Logic .................................. 266     .         Wiring Diagram .................................................... 308  .
 DTC Confirmation Procedure .............................. 266       .         Diagnostic Procedure .......................................... 311      .
 Wiring Diagram ................................................... 268
                                                                     .         Component Inspection ......................................... 314       .       K
 Diagnostic Procedure .......................................... 270 .         Removal and Installation ..................................... 314       .
DTC P0181 FTT SENSOR ..................................... 274       .       DTC P0420, P0430 THREE WAY CATALYST FUNC-
 Component Description ....................................... 274   .       TION ....................................................................... 315
                                                                                                                                                        .       L
 On Board Diagnosis Logic .................................. 274     .         On Board Diagnosis Logic ................................... 315         .
 DTC Confirmation Procedure .............................. 274       .         DTC Confirmation Procedure .............................. 315            .
 Wiring Diagram ................................................... 276
                                                                     .         Overall Function Check ....................................... 316       .
 Diagnostic Procedure .......................................... 277 .         Diagnostic Procedure .......................................... 317      .       M
 Component Inspection ........................................ 278   .       DTC P0441 EVAP CONTROL SYSTEM ................ 320                         .
 Removal and Installation ..................................... 278  .         System Description .............................................. 320    .
DTC P0182, P0183 FTT SENSOR ........................ 279             .         On Board Diagnosis Logic ................................... 320         .
 Component Description ....................................... 279   .         DTC Confirmation Procedure .............................. 320            .
 On Board Diagnosis Logic .................................. 279     .         Overall Function Check ....................................... 321       .
 DTC Confirmation Procedure .............................. 279       .         Diagnostic Procedure .......................................... 322      .
 Wiring Diagram ................................................... 280
                                                                     .       DTC P0442 EVAP CONTROL SYSTEM ................ 325                         .
 Diagnostic Procedure .......................................... 281 .         On Board Diagnosis Logic ................................... 325         .
 Component Inspection ........................................ 282   .         DTC Confirmation Procedure .............................. 326            .
 Removal and Installation ..................................... 282  .         Diagnostic Procedure .......................................... 328      .
DTC P0222, P0223 TP SENSOR .......................... 283            .       DTC P0444, P0445 EVAP CANISTER PURGE VOL-
 Component Description ....................................... 283   .       UME CONTROL SOLENOID VALVE ..................... 335                       .
 CONSULT-II Reference Value in Data Monitor Mode                               Description ........................................................... 335
                                                                                                                                                        .
                                                                     . 283     CONSULT-II Reference Value in Data Monitor Mode
 On Board Diagnosis Logic .................................. 283     .                                                                                  . 335
 DTC Confirmation Procedure .............................. 284       .         On Board Diagnosis Logic ................................... 336         .
 Wiring Diagram ................................................... 285
                                                                     .         DTC Confirmation Procedure .............................. 336            .

Revision; 2004 April                                                    EC-3                                                        2003 G35 Coupe
 Wiring Diagram .................................................... 337 .        Component Description ....................................... 386        .
 Diagnostic Procedure .......................................... 339     .        On Board Diagnosis Logic ................................... 386         .
 Component Inspection ......................................... 340      .        Overall Function Check ........................................ 386      .
 Removal and Installation ..................................... 341      .        Diagnostic Procedure ........................................... 387     .
DTC P0447 EVAP CANISTER VENT CONTROL                                              Removal and Installation ...................................... 387      .
VALVE .................................................................... 342
                                                                         .       DTC P0462 FUEL LEVEL SENSOR ...................... 388                    .
 Component Description ....................................... 342       .        Component Description ....................................... 388        .
 CONSULT-II Reference Value in Data Monitor Mode                                  On Board Diagnosis Logic ................................... 388         .
                                                                         . 342    DTC Confirmation Procedure ............................... 388           .
 On Board Diagnosis Logic ................................... 342        .        Diagnostic Procedure ........................................... 389     .
 DTC Confirmation Procedure .............................. 343           .        Removal and Installation ...................................... 389      .
 Wiring Diagram .................................................... 344 .       DTC P0500 VSS ..................................................... 390   .
 Diagnostic Procedure .......................................... 345     .        Description ........................................................... 390
                                                                                                                                                           .
 Component Inspection ......................................... 347      .        On Board Diagnosis Logic ................................... 390         .
DTC P0451 EVAP CONTROL SYSTEM PRESSURE                                            DTC Confirmation Procedure ............................... 390           .
SENSOR ................................................................. 349
                                                                         .        Overall Function Check ........................................ 391      .
 Component Description ....................................... 349       .        Diagnostic Procedure ........................................... 391     .
 CONSULT-II Reference Value in Data Monitor Mode                                 DTC P0506 ISC SYSTEM ...................................... 392           .
                                                                         . 349    Description ........................................................... 392
                                                                                                                                                           .
 On Board Diagnosis Logic ................................... 349        .        On Board Diagnosis Logic ................................... 392         .
 DTC Confirmation Procedure .............................. 350           .        DTC Confirmation Procedure ............................... 392           .
 Diagnostic Procedure .......................................... 350     .        Diagnostic Procedure ........................................... 393     .
 Component Inspection ......................................... 351      .       DTC P0507 ISC SYSTEM ...................................... 394           .
DTC P0452 EVAP CONTROL SYSTEM PRESSURE                                            Description ........................................................... 394
                                                                                                                                                           .
SENSOR ................................................................. 352
                                                                         .        On Board Diagnosis Logic ................................... 394         .
 Component Description ....................................... 352       .        DTC Confirmation Procedure ............................... 394           .
 CONSULT-II Reference Value in Data Monitor Mode                                  Diagnostic Procedure ........................................... 395     .
                                                                         . 352   DTC P0550 PSP SENSOR ..................................... 396            .
 On Board Diagnosis Logic ................................... 352        .        Component Description ....................................... 396        .
 DTC Confirmation Procedure .............................. 353           .        CONSULT-II Reference Value in Data Monitor Mode
 Wiring Diagram .................................................... 354 .                                                                                 .396
 Diagnostic Procedure .......................................... 355     .        On Board Diagnosis Logic ................................... 396         .
 Component Inspection ......................................... 357      .        DTC Confirmation Procedure ............................... 396           .
DTC P0453 EVAP CONTROL SYSTEM PRESSURE                                            Wiring Diagram .................................................... 397  .
SENSOR ................................................................. 358
                                                                         .        Diagnostic Procedure ........................................... 398     .
 Component Description ....................................... 358       .        Component Inspection ......................................... 400       .
 CONSULT-II Reference Value in Data Monitor Mode                                 DTC P0605 ECM .................................................... 401    .
                                                                         . 358    Component Description ....................................... 401        .
 On Board Diagnosis Logic ................................... 358        .        On Board Diagnosis Logic ................................... 401         .
 DTC Confirmation Procedure .............................. 359           .        DTC Confirmation Procedure ............................... 401           .
 Wiring Diagram .................................................... 360 .        Diagnostic Procedure ........................................... 402     .
 Diagnostic Procedure .......................................... 361     .       DTC P1065 ECM POWER SUPPLY ....................... 404                    .
 Component Inspection ......................................... 365      .        Component Description ....................................... 404        .
DTC P0455 EVAP CONTROL SYSTEM ................ 366                       .        On Board Diagnosis Logic ................................... 404         .
 On Board Diagnosis Logic ................................... 366        .        DTC Confirmation Procedure ............................... 404           .
 DTC Confirmation Procedure .............................. 367           .        Wiring Diagram .................................................... 405  .
 Diagnostic Procedure .......................................... 368     .        Diagnostic Procedure ........................................... 406     .
DTC P0456 EVAP CONTROL SYSTEM ................ 374                       .       DTC P1111, P1136 IVT CONTROL SOLENOID
 On Board Diagnosis Logic ................................... 374        .       VALVE ..................................................................... 408
                                                                                                                                                           .
 DTC Confirmation Procedure .............................. 375           .        Component Description ....................................... 408        .
 Overall Function Check ....................................... 376      .        CONSULT-II Reference Value in Data Monitor Mode
 Diagnostic Procedure .......................................... 377     .                                                                                 .408
DTC P0460 FUEL LEVEL SENSOR ...................... 384                   .        On Board Diagnosis Logic ................................... 408         .
 Component Description ....................................... 384       .        DTC Confirmation Procedure ............................... 408           .
 On Board Diagnosis Logic ................................... 384        .        Wiring Diagram .................................................... 409  .
 DTC Confirmation Procedure .............................. 384           .        Diagnostic Procedure ........................................... 412     .
 Diagnostic Procedure .......................................... 385     .        Component Inspection ......................................... 414       .
 Removal and Installation ..................................... 385      .        Removal and Installation ...................................... 414      .
DTC P0461 FUEL LEVEL SENSOR ...................... 386                   .       DTC P1121 ELECTRIC THROTTLE CONTROL

Revision; 2004 April                                                        EC-4                                                        2003 G35 Coupe
ACTUATOR ........................................................... 415.        Diagnostic Procedure .......................................... 452   .
 Component Description ....................................... 415      .        Component Inspection ......................................... 455    .       A
 On Board Diagnosis Logic .................................. 415        .        Removal and Installation ..................................... 457    .
 DTC Confirmation Procedure .............................. 415          .       DTC P1147, P1167 HO2S2 .................................... 458        .
 Diagnostic Procedure .......................................... 416    .        Component Description ....................................... 458     .       EC
DTC P1122 ELECTRIC THROTTLE CONTROL                                              CONSULT-II Reference Value in Data Monitor Mode
FUNCTION ............................................................. 417
                                                                        .                                                                              . 458
 Description .......................................................... 417
                                                                        .        On Board Diagnosis Logic ................................... 458      .
 On Board Diagnosis Logic .................................. 417        .        DTC Confirmation Procedure .............................. 459         .       C
 DTC Confirmation Procedure .............................. 417          .        Overall Function Check ....................................... 459    .
 Wiring Diagram ................................................... 418 .        Wiring Diagram .................................................... 461
                                                                                                                                                       .
 Diagnostic Procedure .......................................... 419    .        Diagnostic Procedure .......................................... 464   .       D
 Component Inspection ........................................ 422      .        Component Inspection ......................................... 467    .
 Remove and Installation ...................................... 422     .        Removal and Installation ..................................... 469    .
DTC P1124, P1126 THROTTLE CONTROL MOTOR                                         DTC P1148, P1168 CLOSED LOOP CONTROL ... 470                           .       E
RELAY ................................................................... 423
                                                                        .        On Board Diagnosis Logic ................................... 470      .
 Component Description ....................................... 423      .        DTC Confirmation Procedure .............................. 470         .
 CONSULT-II Reference Value in Data Monitor Mode                                 Overall Function Check ....................................... 471    .
                                                                        . 423    Diagnostic Procedure .......................................... 471   .       F
 On Board Diagnosis Logic .................................. 423        .       DTC P1211 TCS CONTROL UNIT ......................... 472               .
 DTC Confirmation Procedure .............................. 423          .        Description ........................................................... 472
                                                                                                                                                       .
 Wiring Diagram ................................................... 425 .        On Board Diagnosis Logic ................................... 472      .       G
 Diagnostic Procedure .......................................... 426    .        DTC Confirmation Procedure .............................. 472         .
DTC P1128 THROTTLE CONTROL MOTOR ....... 428                            .        Diagnostic Procedure .......................................... 472   .
 Component Description ....................................... 428      .       DTC P1212 TCS COMMUNICATION LINE ........... 473                       .       H
 On Board Diagnosis Logic .................................. 428        .        Description ........................................................... 473
                                                                                                                                                       .
 DTC Confirmation Procedure .............................. 428          .        On Board Diagnosis Logic ................................... 473      .
 Wiring Diagram ................................................... 429 .        DTC Confirmation Procedure .............................. 473         .
                                                                                                                                                                I
 Diagnostic Procedure .......................................... 430    .        Diagnostic Procedure .......................................... 473   .
 Component Inspection ........................................ 431      .       DTC P1217 ENGINE OVER TEMPERATURE ....... 474                          .
 Removal and Installation ..................................... 432     .        Description ........................................................... 474
                                                                                                                                                       .
DTC P1143, P1163 HO2S1 .................................... 433         .        CONSULT-II Reference Value in Data Monitor Mode                               J
 Component Description ....................................... 433      .                                                                              . 475
 CONSULT-II Reference Value in Data Monitor Mode                                 On Board Diagnosis Logic ................................... 475      .
                                                                        . 433    Overall Function Check ....................................... 476    .       K
 On Board Diagnosis Logic .................................. 433        .        Wiring Diagram .................................................... 478
                                                                                                                                                       .
 DTC Confirmation Procedure .............................. 434          .        Diagnostic Procedure .......................................... 480   .
 Overall Function Check ....................................... 435     .        Main 12 Causes of Overheating .......................... 484          .       L
 Diagnostic Procedure .......................................... 435    .        Component Inspection ......................................... 485    .
 Component Inspection ........................................ 437      .       DTC P1225 TP SENSOR ....................................... 486        .
 Removal and Installation ..................................... 438     .        Component Description ....................................... 486     .
DTC P1144, P1164 HO2S1 .................................... 439         .        On Board Diagnosis Logic ................................... 486      .       M
 Component Description ....................................... 439      .        DTC Confirmation Procedure .............................. 486         .
 CONSULT-II Reference Value in Data Monitor Mode                                 Diagnostic Procedure .......................................... 487   .
                                                                        . 439    Removal and Installation ..................................... 487    .
 On Board Diagnosis Logic .................................. 439        .       DTC P1226 TP SENSOR ....................................... 488        .
 DTC Confirmation Procedure .............................. 440          .        Component Description ....................................... 488     .
 Overall Function Check ....................................... 441     .        On Board Diagnosis Logic ................................... 488      .
 Diagnostic Procedure .......................................... 441    .        DTC Confirmation Procedure .............................. 488         .
 Component Inspection ........................................ 443      .        Diagnostic Procedure .......................................... 489   .
 Removal and Installation ..................................... 445     .        Removal and Installation ..................................... 489    .
DTC P1146, P1166 HO2S2 .................................... 446         .       DTC P1229 SENSOR POWER SUPPLY ............... 490                      .
 Component Description ....................................... 446      .        On Board Diagnosis Logic ................................... 490      .
 CONSULT-II Reference Value in Data Monitor Mode                                 DTC Confirmation Procedure .............................. 490         .
                                                                        . 446    Wiring Diagram .................................................... 491
                                                                                                                                                       .
 On Board Diagnosis Logic .................................. 446        .        Diagnostic Procedure .......................................... 492   .
 DTC Confirmation Procedure .............................. 447          .       DTC P1444 EVAP CANISTER PURGE VOLUME
 Overall Function Check ....................................... 447     .       CONTROL SOLENOID VALVE .............................. 495              .
 Wiring Diagram ................................................... 449 .        Description ........................................................... 495
                                                                                                                                                       .

Revision; 2004 April                                                      EC-5                                                      2003 G35 Coupe
 CONSULT-II Reference Value in Data Monitor Mode                                 DTC P2122, P2123 APP SENSOR ........................ 550                .
                                                                         . 495     Component Description ....................................... 550     .
 On Board Diagnosis Logic ................................... 496        .         CONSULT-II Reference Value in Data Monitor Mode
 DTC Confirmation Procedure .............................. 496           .                                                                               .550
 Wiring Diagram .................................................... 497 .         On Board Diagnosis Logic ................................... 550      .
 Diagnostic Procedure .......................................... 499     .         DTC Confirmation Procedure ............................... 551        .
 Component Inspection ......................................... 501      .         Wiring Diagram .................................................... 552
                                                                                                                                                         .
 Removal and Installation ..................................... 502      .         Diagnostic Procedure ........................................... 553  .
DTC P1446 EVAP CANISTER VENT CONTROL                                               Component Inspection ......................................... 555    .
VALVE .................................................................... 503
                                                                         .         Removal and Installation ...................................... 556   .
 Component Description ....................................... 503       .       DTC P2127, P2128 APP SENSOR ........................ 557                .
 CONSULT-II Reference Value in Data Monitor Mode                                   Component Description ....................................... 557     .
                                                                         . 503     CONSULT-II Reference Value in Data Monitor Mode
 On Board Diagnosis Logic ................................... 503        .                                                                               .557
 DTC Confirmation Procedure .............................. 504           .         On Board Diagnosis Logic ................................... 557      .
 Wiring Diagram .................................................... 505 .         DTC Confirmation Procedure ............................... 558        .
 Diagnostic Procedure .......................................... 506     .         Wiring Diagram .................................................... 559
                                                                                                                                                         .
 Component Inspection ......................................... 508      .         Diagnostic Procedure ........................................... 560  .
DTC P1564 ASCD STEERING SWITCH ............... 510                       .         Component Inspection ......................................... 563    .
 Component Description ....................................... 510       .         Removal and Installation ...................................... 563   .
 CONSULT-II Reference Value in Data Monitor Mode                                 DTC P2135 TP SENSOR ....................................... 564         .
                                                                         . 510     Component Description ....................................... 564     .
 On Board Diagnosis Logic ................................... 510        .         CONSULT-II Reference Value in Data Monitor Mode
 DTC Confirmation Procedure .............................. 511           .                                                                               .564
 Wiring Diagram .................................................... 512 .         On Board Diagnosis Logic ................................... 564      .
 Diagnostic Procedure .......................................... 514     .         DTC Confirmation Procedure ............................... 565        .
 Component Inspection ......................................... 516      .         Wiring Diagram .................................................... 566
                                                                                                                                                         .
DTC P1572 ASCD BRAKE SWITCH ..................... 517                    .         Diagnostic Procedure ........................................... 567  .
 Component Description ....................................... 517       .         Component Inspection ......................................... 570    .
 CONSULT-II Reference Value in Data Monitor Mode                                   Removal and Installation ...................................... 570   .
                                                                         . 517   DTC P2138 APP SENSOR ..................................... 571          .
 On Board Diagnosis Logic ................................... 517        .         Component Description ....................................... 571     .
 DTC confirmation Procedure ............................... 518          .         CONSULT-II Reference Value in Data Monitor Mode
 Wiring Diagram .................................................... 519 .                                                                               .571
 Diagnostic Procedure .......................................... 521     .         On Board Diagnosis Logic ................................... 571      .
 Component Inspection ......................................... 531      .         DTC Confirmation Procedure ............................... 572        .
DTC P1574 ASCD VEHICLE SPEED SENSOR .... 533                             .         Wiring Diagram .................................................... 573
                                                                                                                                                         .
 Component Description ....................................... 533       .         Diagnostic Procedure ........................................... 574  .
 On Board Diagnosis Logic ................................... 533        .         Component Inspection ......................................... 579    .
 DTC Confirmation Procedure .............................. 533           .         Removal and Installation ...................................... 579   .
 Diagnostic Procedure .......................................... 534     .       IGNITION SIGNAL ................................................. 580   .
DTC P1706 PNP SWITCH ..................................... 535           .         Component Description ....................................... 580     .
 Component Description ....................................... 535       .         Wiring Diagram .................................................... 581
                                                                                                                                                         .
 CONSULT-II Reference Value in Data Monitor Mode                                   Diagnostic Procedure ........................................... 586  .
                                                                         . 535     Component Inspection ......................................... 591    .
 On Board Diagnosis Logic ................................... 535        .         Removal and Installation ...................................... 591   .
 DTC Confirmation Procedure .............................. 535           .       INJECTOR CIRCUIT .............................................. 592     .
 Overall Function Check ....................................... 536      .         Component Description ....................................... 592     .
 Wiring Diagram .................................................... 537 .         CONSULT-II Reference Value in Data Monitor Mode
 Diagnostic Procedure .......................................... 540     .                                                                               .592
DTC P1805 BRAKE SWITCH ................................ 544              .         Wiring Diagram .................................................... 593
                                                                                                                                                         .
 Description ........................................................... 544
                                                                         .         Diagnostic Procedure ........................................... 595  .
 CONSULT-II Reference Value in Data Monitor Mode                                   Component Inspection ......................................... 597    .
                                                                         . 544     Removal and Installation ...................................... 597   .
 On Board Diagnosis Logic ................................... 544        .       FUEL PUMP CIRCUIT ............................................ 598      .
 DTC Confirmation Procedure .............................. 544           .         Description ........................................................... 598
                                                                                                                                                         .
 Wiring Diagram .................................................... 545 .         CONSULT-II Reference Value in Data Monitor Mode
 Diagnostic Procedure .......................................... 546     .                                                                               .598
 Component Inspection ......................................... 549      .         Wiring Diagram .................................................... 599
                                                                                                                                                         .

Revision; 2004 April                                                        EC-6                                                      2003 G35 Coupe
 Diagnostic Procedure .......................................... 600  .         Description ........................................................... 630
                                                                                                                                                         .
 Component Inspection ........................................ 603    .         Component Inspection ......................................... 633       .       A
 Removal and Installation ..................................... 603   .         Removal and Installation ..................................... 634       .
REFRIGERANT PRESSURE SENSOR ................ 604                      .         How to Detect Fuel Vapor Leakage ..................... 634               .
 Component Description ....................................... 604    .       ON BOARD REFUELING VAPOR RECOVERY                                                  EC
 Wiring Diagram ................................................... 605
                                                                      .       (ORVR) ................................................................... 637
                                                                                                                                                         .
 Diagnostic Procedure .......................................... 606  .         System Description .............................................. 637    .
 Removal and Installation ..................................... 608   .         Diagnostic Procedure .......................................... 638      .
ELECTRICAL LOAD SIGNAL ............................... 609            .         Component Inspection ......................................... 640       .       C
 Description .......................................................... 609
                                                                      .       POSITIVE CRANKCASE VENTILATION .............. 642                          .
 CONSULT-II Reference Value in Data Monitor Mode                                Description ........................................................... 642
                                                                                                                                                         .
                                                                      . 609     Component Inspection ......................................... 642       .       D
 Diagn



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