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G35 Coupe V35 (2003)
Service Manual – Accelerator Control System
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Table of contents
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Infiniti G35 Coupe V35 (2003) Service Manual – Engine Control System

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ENGINE CONTROL SYSTEM
B ENGINE
A
EC
SECTION EC
INDEX FOR DTC ........................................................ 8
Alphabetical Index .................................................... 8
DTC No. Index ....................................................... 12
PRECAUTIONS ........................................................ 16
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 16
Precautions for Battery Service .............................. 16
On Board Diagnostic (OBD) System of Engine and
A/T ............................ ............. ............. ............. ....... 16
Precaution ...................... ........................................ 17
Wiring Diagrams and Trouble Diagnosis ................ 19
PREPARATION ......................................................... 20
Special Service Tools ............................................. 20
Commercial Service Tools ...................................... 21
ENGINE CONTROL SYSTEM .................................. 22
System Diagram ..................................................... 22
Vacuum Hose Drawing ........................................... 23
System Chart ......................................................... 24
Multiport Fuel Injection (MFI) System .................... 25
Electronic Ignition (EI) System ............................... 27
Air Conditioning Cut Control ................................... 28
Fuel Cut Control (at No Load and High Engine
Speed) ...................... ............. ............. ............. ....... 28
CAN communication .............................................. 29
BASIC SERVICE PROCEDURE .............................. 34
Idle Speed and Ignition Timing Check .................... 34
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment ............................................................. 35
Accelerator Pedal Released Position Learning ...... 46
Throttle Valve Closed Position Learning ................ 46
Idle Air Volume Learning ........................................ 46
Fuel Pressure Check .............................................. 48
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 50
Introduction ............................................................ 50
Two Trip Detection Logic ........................................ 50
Emission-Related Diagnostic Information .............. 51
IVIS (Infi niti V ehi cle Immob ilizer S ystem — N A TS) ... 66
Malfunction Indicator Lamp (MIL) ........................... 66
OBD System Operation Chart ................................ 70
ENGINE CONTROL SYSTEM
CONTENTS
TROUBLE DIAGNOSIS ............................................75
Trouble Diagnosis Introduction ...............................75
DTC Inspection Priority Chart .................................78
Fail-Safe Chart ............................... ....... ...... ....... .... 80
Basic Inspection .....................................................81
Symptom Matrix Chart ............................................86
Engine Control Component Parts Location ............90
Circuit Diagram .......................................................96
ECM Harness Connector Terminal Layout .............98
ECM Terminals and Reference Value .....................98
CONSULT-II Function .. ...... ....... ...... ....... ...... ....... ..107
Generic Scan Tool (GST) Function .......................119
CONSULT-II Reference Value in Data Monitor Mode Major Sensor Reference Graph in Data Monitor
Mode .....................................................................125
TROUBLE DIAGNOSIS - SPECIFICA TION V ALUE .128
Description ............ ....... ...... ....... ...... ....... ...... ....... ..128
Testing Condition ..................................................128
Inspection Procedure ............................................128
Diagnostic Procedure ...........................................129
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .............................. .........................................132
Description ............ ....... ...... ....... ...... ....... ...... ....... ..132
Diagnostic Procedure ...........................................132
POWER SUPPLY CIRCUIT FOR ECM ...................133
Wiring Diagram .....................................................133
Diagnostic Procedure ...........................................136
DTC U1000, U1001 CAN COMMUNICA TION LINE .140
Description ............ ....... ...... ....... ...... ....... ...... ....... ..140
On Board Diagnosis Logic ....................................140
DTC Confirmation Procedure ...............................140
Wiring Diagram .....................................................141
Diagnostic Procedure ...........................................142
DTC P0011, P0021 IVT CONTROL ........................143
Description ............ ....... ...... ....... ...... ....... ...... ....... ..143
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................144
.122
.143
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Revision; 2004 April 2003 G35 Coupe
EC-1
DTC Confirmation Procedure ................... ....... .....144
Diagnostic Procedure ...........................................145
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER .146
Description .......... ......................... .........................146
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................146
DTC Confirmation Procedure ................... ....... .....147
Wiring Diagram .....................................................148
Diagnostic Procedure ...........................................151
Component Inspection ..........................................153
Removal and Installation ......................................153
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER .154
Description .......... ......................... .........................154
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................154
DTC Confirmation Procedure ................... ....... .....155
Wiring Diagram .....................................................156
Diagnostic Procedure ...........................................159
Component Inspection ..........................................161
Removal and Installation ......................................161
DTC P0101 MAF SENSOR .....................................162
Component Description ........................................162
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................162
DTC Confirmation Procedure ................... ....... .....163
Overall Function Check ........................................164
Wiring Diagram .....................................................165
Diagnostic Procedure ...........................................166
Component Inspection ..........................................169
Removal and Installation ......................................169
DTC P0102, P0103 MAF SENSOR .........................170
Component Description ........................................170
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................170
DTC Confirmation Procedure ................... ....... .....171
Wiring Diagram .....................................................172
Diagnostic Procedure ...........................................173
Component Inspection ..........................................176
Removal and Installation ......................................176
DTC P0112, P0113 IAT SENSOR ...........................177
Component Description ........................................177
On Board Diagnosis Logic ....................................177
DTC Confirmation Procedure ................... ....... .....177
Wiring Diagram .....................................................179
Diagnostic Procedure ...........................................180
Component Inspection ..........................................181
Removal and Installation ......................................181
DTC P0117, P0118 ECT SENSOR ..........................182
Component Description ........................................182
On Board Diagnosis Logic ....................................182
DTC Confirmation Procedure ................... ....... .....183
Wiring Diagram .....................................................184
Diagnostic Procedure ...........................................185
Component Inspection ..........................................186
Removal and Installation ......................................186
.146
.154
.162
.170
DTC P0122, P0123 TP SENSOR ............................187
Component Description ........................................187
CONSULT-II Reference Value in Data Monitor Mode
.187
On Board Diagnosis Logic ....................................187
DTC Confirmation Procedure ................................188
Wiring Diagram .....................................................189
Diagnostic Procedure ............................................190
Component Inspection ..........................................193
Removal and Installation .......................................193
DTC P0125 ECT SENSOR ......................................194
Component Description ........................................194
On Board Diagnosis Logic ....................................194
DTC Confirmation Procedure ................................195
Diagnostic Procedure ............................................195
Component Inspection ..........................................196
Removal and Installation .......................................196
DTC P0127 IAT SENSOR ........................................197
Component Description ........................................197
On Board Diagnosis Logic ....................................197
DTC Confirmation Procedure ................................197
Diagnostic Procedure ............................................198
Component Inspection ..........................................198
Removal and Installation .......................................199
DTC P0128 THERMOSTAT FUNCTION .................200
On Board Diagnosis Logic ....................................200
DTC Confirmation Procedure ................................200
Diagnostic Procedure ............................................200
Component Inspection ..........................................201
Removal and Installation .......................................201
DTC P0132, P0152 HO2S1 .....................................202
Component Description ........................................202
CONSULT-II Reference Value in Data Monitor Mode
.202
On Board Diagnosis Logic ....................................202
DTC Confirmation Procedure ................................203
Wiring Diagram .....................................................204
Diagnostic Procedure ............................................207
Component Inspection ..........................................210
Removal and Installation .......................................211
DTC P0133, P0153 HO2S1 .....................................212
Component Description ........................................212
CONSULT-II Reference Value in Data Monitor Mode
.212
On Board Diagnosis Logic ....................................212
DTC Confirmation Procedure ................................213
Overall Function Check .........................................214
Wiring Diagram .....................................................215
Diagnostic Procedure ............................................218
Component Inspection ..........................................223
Removal and Installation .......................................224
DTC P0134, P0154 HO2S1 .....................................225
Component Description ........................................225
CONSULT-II Reference Value in Data Monitor Mode
.225
On Board Diagnosis Logic ....................................225
DTC Confirmation Procedure ................................226
Overall Function Check .........................................227
Wiring Diagram .....................................................228
Revision; 2004 April 2003 G35 Coupe
EC-2
Diagnostic Procedure ........................................... 231
Component Inspection ......................................... 232
Removal and Installation ...................................... 234
DTC P0138, P0158 HO2S2 .................................... 235
Component Description ........................................ 235
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 235
DTC Confirmation Procedure ............................... 236
Wiring Diagram .................................................... 237
Diagnostic Procedure ........................................... 240
Component Inspection ......................................... 243
Removal and Installation ...................................... 244
DTC P0139, P0159 HO2S2 .................................... 245
Component Description ........................................ 245
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 245
DTC Confirmation Procedure ............................... 246
Overall Function Check ........................................ 246
Wiring Diagram .................................................... 248
Diagnostic Procedure ........................................... 251
Component Inspection ......................................... 254
Removal and Installation ...................................... 256
DTC P0171, P0174 FUEL INJECTION SYSTEM
FUNCTION ........................ .......................... ............ 257
On Board Diagnosis Logic ................................... 257
DTC Confirmation Procedure ............................... 257
Wiring Diagram .................................................... 259
Diagnostic Procedure ........................................... 261
DTC P0172, P0175 FUEL INJECTION SYSTEM
FUNCTION ........................ .......................... ............ 266
On Board Diagnosis Logic ................................... 266
DTC Confirmation Procedure ............................... 266
Wiring Diagram .................................................... 268
Diagnostic Procedure ........................................... 270
DTC P0181 FTT SENSOR ...................................... 274
Component Description ........................................ 274
On Board Diagnosis Logic ................................... 274
DTC Confirmation Procedure ............................... 274
Wiring Diagram .................................................... 276
Diagnostic Procedure ........................................... 277
Component Inspection ......................................... 278
Removal and Installation ...................................... 278
DTC P0182, P0183 FTT SENSOR ......................... 279
Component Description ........................................ 279
On Board Diagnosis Logic ................................... 279
DTC Confirmation Procedure ............................... 279
Wiring Diagram .................................................... 280
Diagnostic Procedure ........................................... 281
Component Inspection ......................................... 282
Removal and Installation ...................................... 282
DTC P0222, P0223 TP SENSOR ........................... 283
Component Description ........................................ 283
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 283
DTC Confirmation Procedure ............................... 284
Wiring Diagram .................................................... 285
. 235
. 245
. 283
Diagnostic Procedure ...........................................286
Component Inspection ..........................................289
Removal and Installation ......................................289
DTC P0300 - P0306 MULTIPLE CYLINDER MIS-
FIRE, NO. 1 - 6 CYLINDER MISFIRE .....................290
On Board Diagnosis Logic ....................................290
DTC Confirmation Procedure ...............................290
Diagnostic Procedure ...........................................291
DTC P0327, P0328 KS ...........................................296
Component Description ........................................296
On Board Diagnosis Logic ....................................296
DTC Confirmation Procedure ...............................296
Wiring Diagram .....................................................297
Diagnostic Procedure ...........................................298
Component Inspection ..........................................299
Removal and Installation ......................................300
DTC P0335 CKP SENSOR (POS) ........................ ..301
Component Description ........................................301
CONSULT-II Reference Value in Data Monitor Mode
.301
On Board Diagnosis Logic ....................................301
DTC Confirmation Procedure ...............................301
Wiring Diagram .....................................................302
Diagnostic Procedure ...........................................303
Component Inspection ..........................................306
Removal and Installation ......................................306
DTC P0340, P0345 CMP SENSOR (PHASE) ........307
Component Description ........................................307
CONSULT-II Reference Value in Data Monitor Mode
.307
On Board Diagnosis Logic ....................................307
DTC Confirmation Procedure ...............................307
Wiring Diagram .....................................................308
Diagnostic Procedure ...........................................311
Component Inspection ..........................................314
Removal and Installation ......................................314
DTC P0420, P0430 THREE WAY CAT AL YST FUNC-
TION ..................................... ...................................315
On Board Diagnosis Logic ....................................315
DTC Confirmation Procedure ...............................315
Overall Function Check ........................................316
Diagnostic Procedure ...........................................317
DTC P0441 EVAP CONTROL SYSTEM .. ...... ....... ..320
System Description ...............................................320
On Board Diagnosis Logic ....................................320
DTC Confirmation Procedure ...............................320
Overall Function Check ........................................321
Diagnostic Procedure ...........................................322
DTC P0442 EVAP CONTROL SYSTEM .. ...... ....... ..325
On Board Diagnosis Logic ....................................325
DTC Confirmation Procedure ...............................326
Diagnostic Procedure ...........................................328
DTC P0444, P0445 EVAP CANISTER PURGE VOL-
UME CONTROL SOLENOID VALVE ......................335
Description ............ ....... ...... ....... ...... ....... ...... ....... ..335
CONSULT-II Reference Value in Data Monitor Mode
.335
On Board Diagnosis Logic ....................................336
DTC Confirmation Procedure ...............................336
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Revision; 2004 April 2003 G35 Coupe
EC-3
Wiring Diagram .....................................................337
Diagnostic Procedure ...........................................339
Component Inspection ..........................................340
Removal and Installation ......................................341
DTC P0447 EVAP CANISTER VENT CONTROL
VALVE .....................................................................342
Component Description ........................................342
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................342
DTC Confirmation Procedure ................... ....... .....343
Wiring Diagram .....................................................344
Diagnostic Procedure ...........................................345
Component Inspection ..........................................347
DTC P0451 EVAP CONTROL SYSTEM PRESSURE
SENSOR ............................ ....... ...............................349
Component Description ........................................349
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................349
DTC Confirmation Procedure ................... ....... .....350
Diagnostic Procedure ...........................................350
Component Inspection ..........................................351
DTC P0452 EVAP CONTROL SYSTEM PRESSURE
SENSOR ............................ ....... ...............................352
Component Description ........................................352
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................352
DTC Confirmation Procedure ................... ....... .....353
Wiring Diagram .....................................................354
Diagnostic Procedure ...........................................355
Component Inspection ..........................................357
DTC P0453 EVAP CONTROL SYSTEM PRESSURE
SENSOR ............................ ....... ...............................358
Component Description ........................................358
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................358
DTC Confirmation Procedure ................... ....... .....359
Wiring Diagram .....................................................360
Diagnostic Procedure ...........................................361
Component Inspection ..........................................365
DTC P0455 EVAP CONTROL SYSTEM .................366
On Board Diagnosis Logic ....................................366
DTC Confirmation Procedure ................... ....... .....367
Diagnostic Procedure ...........................................368
DTC P0456 EVAP CONTROL SYSTEM .................374
On Board Diagnosis Logic ....................................374
DTC Confirmation Procedure ................... ....... .....375
Overall Function Check ........................................376
Diagnostic Procedure ...........................................377
DTC P0460 FUEL LEVEL SENSOR .......................384
Component Description ........................................384
On Board Diagnosis Logic ....................................384
DTC Confirmation Procedure ................... ....... .....384
Diagnostic Procedure ...........................................385
Removal and Installation ......................................385
DTC P0461 FUEL LEVEL SENSOR .......................386
.342
.349
.352
.358
Component Description ........................................386
On Board Diagnosis Logic ....................................386
Overall Function Check .........................................386
Diagnostic Procedure ............................................387
Removal and Installation .......................................387
DTC P0462 FUEL LEVEL SENSOR .......................388
Component Description ........................................388
On Board Diagnosis Logic ....................................388
DTC Confirmation Procedure ................................388
Diagnostic Procedure ............................................389
Removal and Installation .......................................389
DTC P0500 VSS ......................................................390
Description ............................................................390
On Board Diagnosis Logic ....................................390
DTC Confirmation Procedure ................................390
Overall Function Check .........................................391
Diagnostic Procedure ............................................391
DTC P0506 ISC SYSTEM .......................................392
Description ............................................................392
On Board Diagnosis Logic ....................................392
DTC Confirmation Procedure ................................392
Diagnostic Procedure ............................................393
DTC P0507 ISC SYSTEM .......................................394
Description ............................................................394
On Board Diagnosis Logic ....................................394
DTC Confirmation Procedure ................................394
Diagnostic Procedure ............................................395
DTC P0550 PSP SENSOR ......................................396
Component Description ........................................396
CONSULT-II Reference Value in Data Monitor Mode
.396
On Board Diagnosis Logic ....................................396
DTC Confirmation Procedure ................................396
Wiring Diagram .....................................................397
Diagnostic Procedure ............................................398
Component Inspection ..........................................400
DTC P0605 ECM .....................................................401
Component Description ........................................401
On Board Diagnosis Logic ....................................401
DTC Confirmation Procedure ................................401
Diagnostic Procedure ............................................402
DTC P1065 ECM POWER SUPPLY ........................404
Component Description ........................................404
On Board Diagnosis Logic ....................................404
DTC Confirmation Procedure ................................404
Wiring Diagram .....................................................405
Diagnostic Procedure ............................................406
DTC P1111, P1136 IVT CONTROL SOLENOID
VALVE ............................. ............. ............. ............. ..408
Component Description ........................................408
CONSULT-II Reference Value in Data Monitor Mode
.408
On Board Diagnosis Logic ....................................408
DTC Confirmation Procedure ................................408
Wiring Diagram .....................................................409
Diagnostic Procedure ............................................412
Component Inspection ..........................................414
Removal and Installation .......................................414
DTC P1121 ELECTRIC THROTTLE CONTROL
Revision; 2004 April 2003 G35 Coupe
EC-4
ACTUATOR ............................................................ 415
Component Description ........................................ 415
On Board Diagnosis Logic ................................... 415
DTC Confirmation Procedure ............................... 415
Diagnostic Procedure ........................................... 416
DTC P1122 ELECTRIC THROTTLE CONTROL
FUNCTION ........................ .......................... ............ 417
Description ........................................................... 417
On Board Diagnosis Logic ................................... 417
DTC Confirmation Procedure ............................... 417
Wiring Diagram .................................................... 418
Diagnostic Procedure ........................................... 419
Component Inspection ......................................... 422
Remove and Installation ....................................... 422
DTC P1124, P1126 THROTTLE CONTROL MOTOR
RELAY .................................................................... 423
Component Description ........................................ 423
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 423
DTC Confirmation Procedure ............................... 423
Wiring Diagram .................................................... 425
Diagnostic Procedure ........................................... 426
DTC P1128 THROTTLE CONTROL MOTOR ........ 428
Component Description ........................................ 428
On Board Diagnosis Logic ................................... 428
DTC Confirmation Procedure ............................... 428
Wiring Diagram .................................................... 429
Diagnostic Procedure ........................................... 430
Component Inspection ......................................... 431
Removal and Installation ...................................... 432
DTC P1143, P1163 HO2S1 ..................................... 433
Component Description ........................................ 433
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 433
DTC Confirmation Procedure ............................... 434
Overall Function Check ........................................ 435
Diagnostic Procedure ........................................... 435
Component Inspection ......................................... 437
Removal and Installation ...................................... 438
DTC P1144, P1164 HO2S1 ..................................... 439
Component Description ........................................ 439
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 439
DTC Confirmation Procedure ............................... 440
Overall Function Check ........................................ 441
Diagnostic Procedure ........................................... 441
Component Inspection ......................................... 443
Removal and Installation ...................................... 445
DTC P1146, P1166 HO2S2 ..................................... 446
Component Description ........................................ 446
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ................................... 446
DTC Confirmation Procedure ............................... 447
Overall Function Check ........................................ 447
Wiring Diagram .................................................... 449
. 423
. 433
. 439
. 446
Diagnostic Procedure ...........................................452
Component Inspection ..........................................455
Removal and Installation ......................................457
DTC P1147, P1167 HO2S2 .....................................458
Component Description ........................................458
CONSULT-II Reference Value in Data Monitor Mode
.458
On Board Diagnosis Logic ....................................458
DTC Confirmation Procedure ...............................459
Overall Function Check ........................................459
Wiring Diagram .....................................................461
Diagnostic Procedure ...........................................464
Component Inspection ..........................................467
Removal and Installation ......................................469
DTC P1148, P1168 CLOSED LOOP CONTROL ....470
On Board Diagnosis Logic ....................................470
DTC Confirmation Procedure ...............................470
Overall Function Check ........................................471
Diagnostic Procedure ...........................................471
DTC P1211 TCS CONTROL UNIT ..........................472
Description ............ ....... ...... ....... ...... ....... ...... ....... ..472
On Board Diagnosis Logic ....................................472
DTC Confirmation Procedure ...............................472
Diagnostic Procedure ...........................................472
DTC P1212 TCS COMMUNICATION LINE ............473
Description ............ ....... ...... ....... ...... ....... ...... ....... ..473
On Board Diagnosis Logic ....................................473
DTC Confirmation Procedure ...............................473
Diagnostic Procedure ...........................................473
DTC P1217 ENGINE OVER TEMPERATURE ........474
Description ............ ....... ...... ....... ...... ....... ...... ....... ..474
CONSULT-II Reference Value in Data Monitor Mode
.475
On Board Diagnosis Logic ....................................475
Overall Function Check ........................................476
Wiring Diagram .....................................................478
Diagnostic Procedure ...........................................480
Main 12 Causes of Overheating ...........................484
Component Inspection ..........................................485
DTC P1225 TP SENSOR ............................... ....... ..486
Component Description ........................................486
On Board Diagnosis Logic ....................................486
DTC Confirmation Procedure ...............................486
Diagnostic Procedure ...........................................487
Removal and Installation ......................................487
DTC P1226 TP SENSOR ............................... ....... ..488
Component Description ........................................488
On Board Diagnosis Logic ....................................488
DTC Confirmation Procedure ...............................488
Diagnostic Procedure ...........................................489
Removal and Installation ......................................489
DTC P1229 SENSOR POWER SUPPLY ................490
On Board Diagnosis Logic ....................................490
DTC Confirmation Procedure ...............................490
Wiring Diagram .....................................................491
Diagnostic Procedure ...........................................492
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE ...............................495
Description ............ ....... ...... ....... ...... ....... ...... ....... ..495
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Revision; 2004 April 2003 G35 Coupe
EC-5
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................496
DTC Confirmation Procedure ................... ....... .....496
Wiring Diagram .....................................................497
Diagnostic Procedure ...........................................499
Component Inspection ..........................................501
Removal and Installation ......................................502
DTC P1446 EVAP CANISTER VENT CONTROL
VALVE .....................................................................503
Component Description ........................................503
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................503
DTC Confirmation Procedure ................... ....... .....504
Wiring Diagram .....................................................505
Diagnostic Procedure ...........................................506
Component Inspection ..........................................508
DTC P1564 ASCD STEERING SWITCH ................510
Component Description ........................................510
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................510
DTC Confirmation Procedure ................... ....... .....511
Wiring Diagram .....................................................512
Diagnostic Procedure ...........................................514
Component Inspection ..........................................516
DTC P1572 ASCD BRAKE SWITCH ......................517
Component Description ........................................517
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................517
DTC confirmation Procedure . ...... ....... ...... ....... .....518
Wiring Diagram .....................................................519
Diagnostic Procedure ...........................................521
Component Inspection ..........................................531
DTC P1574 ASCD VEHICLE SPEED SENSOR .....533
Component Description ........................................533
On Board Diagnosis Logic ....................................533
DTC Confirmation Procedure ................... ....... .....533
Diagnostic Procedure ...........................................534
DTC P1706 PNP SWITCH ......................................535
Component Description ........................................535
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................535
DTC Confirmation Procedure ................... ....... .....535
Overall Function Check ........................................536
Wiring Diagram .....................................................537
Diagnostic Procedure ...........................................540
DTC P1805 BRAKE SWITCH .................................544
Description .......... ......................... .........................544
CONSULT-II Reference Value in Data Monitor Mode
On Board Diagnosis Logic ....................................544
DTC Confirmation Procedure ................... ....... .....544
Wiring Diagram .....................................................545
Diagnostic Procedure ...........................................546
Component Inspection ..........................................549
.495
.503
.510
.517
.535
.544
DTC P2122, P2123 APP SENSOR .........................550
Component Description ........................................550
CONSULT-II Reference Value in Data Monitor Mode
.550
On Board Diagnosis Logic ....................................550
DTC Confirmation Procedure ................................551
Wiring Diagram .....................................................552
Diagnostic Procedure ............................................553
Component Inspection ..........................................555
Removal and Installation .......................................556
DTC P2127, P2128 APP SENSOR .........................557
Component Description ........................................557
CONSULT-II Reference Value in Data Monitor Mode
.557
On Board Diagnosis Logic ....................................557
DTC Confirmation Procedure ................................558
Wiring Diagram .....................................................559
Diagnostic Procedure ............................................560
Component Inspection ..........................................563
Removal and Installation .......................................563
DTC P2135 TP SENSOR ........................................564
Component Description ........................................564
CONSULT-II Reference Value in Data Monitor Mode
.564
On Board Diagnosis Logic ....................................564
DTC Confirmation Procedure ................................565
Wiring Diagram .....................................................566
Diagnostic Procedure ............................................567
Component Inspection ..........................................570
Removal and Installation .......................................570
DTC P2138 APP SENSOR ......................................571
Component Description ........................................571
CONSULT-II Reference Value in Data Monitor Mode
.571
On Board Diagnosis Logic ....................................571
DTC Confirmation Procedure ................................572
Wiring Diagram .....................................................573
Diagnostic Procedure ............................................574
Component Inspection ..........................................579
Removal and Installation .......................................579
IGNITION SIGNAL ..................................................580
Component Description ........................................580
Wiring Diagram .....................................................581
Diagnostic Procedure ............................................586
Component Inspection ..........................................591
Removal and Installation .......................................591
INJECTOR CIRCUIT ...............................................592
Component Description ........................................592
CONSULT-II Reference Value in Data Monitor Mode
.592
Wiring Diagram .....................................................593
Diagnostic Procedure ............................................595
Component Inspection ..........................................597
Removal and Installation .......................................597
FUEL PUMP CIRCUIT .............................................598
Description ............................................................598
CONSULT-II Reference Value in Data Monitor Mode
.598
Wiring Diagram .....................................................599
Revision; 2004 April 2003 G35 Coupe
EC-6
Diagnostic Procedure ........................................... 600
Component Inspection ......................................... 603
Removal and Installation ...................................... 603
REFRIGERANT PRESSURE SENSOR ................. 604
Component Description ........................................ 604
Wiring Diagram .................................................... 605
Diagnostic Procedure ........................................... 606
Removal and Installation ...................................... 608
ELECTRICAL LOAD SIGNAL ................................ 609
Description ........................................................... 609
CONSULT-II Reference Value in Data Monitor Mode
. 609
Diagnostic Procedure ........................................... 609
ASCD BRAKE SWITCH ......................................... 610
Component Description ........................................ 610
CONSULT-II Reference Value in Data Monitor Mode
. 610
Wiring Diagram .....................................................611
Diagnostic Procedure ........................................... 613
Component Inspection ......................................... 623
ASCD INDICATOR ................................................. 625
Component Description ........................................ 625
CONSULT-II Reference Value in Data Monitor Mode
. 625
Wiring Diagram .................................................... 626
Diagnostic Procedure ........................................... 627
MIL AND DATA LINK CONNECTOR ..................... 628
Wiring Diagram .................................................... 628
EV APORATIVE EMISSION SYSTEM ..................... 630
Description ............ ....... ...... ....... ...... ....... ...... ....... ..630
Component Inspection ..........................................633
Removal and Installation ......................................634
How to Detect Fuel Vapor Leakage ......................634
ON BOARD REFUELING VAPOR RECOVERY
(ORVR) ................................. ...................................637
System Description ...............................................637
Diagnostic Procedure ...........................................638
Component Inspection ..........................................640
POSITIVE CRANKCASE VENTILATION ............. ..642
Description ............ ....... ...... ....... ...... ....... ...... ....... ..642
Component Inspection ..........................................642
AUTOMA TIC SPEED CONTROL DEVICE ( ASCD) .644
System Description ...............................................644
Component Description ........................................645
SERVICE DATA AND SPECIFICATIONS (SDS) ....646
Fuel Pressure .......................................................646
Idle Speed and Ignition Timing .............. ...... ....... ..646
Calculated Load Value ..........................................646
Mass Air Flow Sensor ...........................................646
Intake Air Temperature Sensor .............................646
Engine Coolant Temperature Sensor ...................646
Heated Oxygen Sensor 1 Heater .........................646
Heated Oxygen Sensor 2 Heater .........................646
Crankshaft Position Sensor (POS) .......................646
Camshaft Position Sensor (PHASE) ....................646
Throttle Control Motor ............... ...... ....... ...............647
Injector ......................... ....................................... ..647
Fuel Pump ............................................................647
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EC-7

INDEX FOR DTC

INDEX FOR DTC PFP:00024 Alphabetical Index ABS0036X

NOTE: If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000, U1001. Refer to EC-140, "
Items
(CONSULT-II screen terms)
A/T INTERLOCK P1730 1730 1 × AT-159 A/T TCC S/V FNCTN P0744 0744 2 × AT-122 APP SEN 1/CIRC P2122 2122 1 × EC-550 APP SEN 1/CIRC P2123 2123 1 × EC-550 APP SEN 2/CIRC P2127 2127 1 × EC-557 APP SEN 2/CIRC P2128 2128 1 × EC-557 APP SENSOR P2138 2138 1 × EC-571 ASCD BRAKE SW P1572 1572 1 — EC-517 ASCD SW P1564 1564 1 — EC-510 ASCD VHL SPD SEN P1574 1574 1 — EC-533 A TF TEMP SEN/CIRC P0710 0710 2 × AT-146 BRAKE SW/CIRCUIT P1805 1805 2 — EC-544
CAN COMM CIRCUIT U1000 CAN COMM CIRCUIT U1001
CKP SEN/CIRCUIT P0335 0335 2 × EC-301 CLOSED LOOP-B1 P1148 1148 1 × EC-470 CLOSED LOOP-B2 P1168 1168 1 × EC-470 CMP SEN/CIRC-B1 P0340 0340 2 × EC-307
CMP SEN/CIRC-B2 P0345 0345 2 × EC-307 CTP LEARNING P1225 1225 2 — EC-486 CTP LEARNING P1226 1226 2 — EC-488 CYL 1 MISFIRE P0301 0301 2 × EC-290 CYL 2 MISFIRE P0302 0302 2 × EC-290 CYL 3 MISFIRE P0303 0303 2 × EC-290 CYL 4 MISFIRE P0304 0304 2 × EC-290 CYL 5 MISFIRE P0305 0305 2 × EC-290 CYL 6 MISFIRE P0306 0306 2 × EC-290 D/C SOLENOID/CIRC P1762 1762 1 × AT-189 D/C SOLENOID FNCTN P1764 1764 1 × AT-194 ECM P0605 0605 1 or 2 × or — EC-401 ECM BACK UP/CIRCUIT P1065 1065 2 × EC-404 ECT SEN/CIRCUIT P0117 0117 1 × EC-182 ECT SEN/CIRCUIT P0118 0118 1 × EC-182 ECT SENSOR P0125 0125 1 × EC-194 ENG OVER TEMP P1217 1217 1 × EC-474 ENGINE SPEED SIG P0725 0725 2 × AT-115 ETC ACTR P1121 1121 1 × EC-415
DTC U1000, U1001 CAN COMMUNICATION LINE" .
1
DTC*
CONSULT-II
GST*
2
ECM*
1000* 1001*
3
5
5
Trip
1 × EC-140 2—EC-140
×:Applicable —: Not applicable
MIL lighting
up
Reference page
Revision; 2004 April 2003 G35 Coupe
EC-8
INDEX FOR DTC
1
Items
(CONSULT-II screen terms)
ETC FUNCTION/CIRC P1122 1122 1 × EC-417 ETC MOT P1128 1128 1 × EC-428 ETC MOT PWR P1124 1124 1 × EC-423 ETC MOT PWR P1126 1126 1 × EC-423 EVAP GROSS LEAK P0455 0455 2 × EC-366 EVAP PURG FLOW/MON P0441 0441 2 × EC-320 EVAP SMALL LEAK P0442 0442 2 × EC-325 EVAP SYS PRES SEN P0451 0451 2 × EC-349 EVAP SYS PRES SEN P0452 0452 2 × EC-352 EVAP SYS PRES SEN P0453 0453 2 × EC-358 EVAP VERY SML LEAK P0456 0456 2 × EC-374 FR/B SOLENOID/CIRC P1757 1757 1 × AT-179 FR/B SOLENOID FNCT P1759 1759 1 × AT-184 FTT SEN/CIRCUIT P0182 0182 2 × EC-279 FTT SEN/CIRCUIT P0183 0183 2 × EC-279 FTT SENSOR P0181 0181 2 × EC-274 FUEL LEV SEN SLOSH P0460 0460 2 × EC-384 FUEL LEVEL SENSOR P0461 0461 2 × EC-386 FUEL LEVL SEN/CIRC P0462 0462 2 × EC-388 FUEL SYS-LEAN-B1 P0171 0171 2 × EC-257 FUEL SYS-LEAN-B2 P0174 0174 2 × EC-257 FUEL SYS-RICH-B1 P0172 0172 2 × EC-266 FUEL SYS-RICH-B2 P0175 0175 2 × EC-266
HLR/C SOL FNCTN P1769 1769 1 × AT-203 HLR/C SOL/CIRC P1767 1767 1 × AT-198 HO2S1 (B1) P0132 0132 2 × EC-202 HO2S1 (B1) P0133 0133 2 × EC-212 HO2S1 (B1) P0134 0134 2 × EC-225 HO2S1 (B1) P1143 1143 2 × EC-433 HO2S1 (B1) P1144 1144 2 × EC-439 HO2S1 (B2) P0152 0152 2 × EC-202 HO2S1 (B2) P0153 0153 2 × EC-212 HO2S1 (B2) P0154 0154 2 × EC-225 HO2S1 (B2) P1163 1163 2 × EC-433 HO2S1 (B2) P1164 1164 2 × EC-439 HO2S1 HTR (B1) P0031 0031 2 × EC-146 HO2S1 HTR (B1) P0032 0032 2 × EC-146 HO2S1 HTR (B2) P0051 0051 2 × EC-146 HO2S1 HTR (B2) P0052 0052 2 × EC-146 HO2S2 (B1) P0138 0138 2 × EC-235 HO2S2 (B1) P0139 0139 2 × EC-245 HO2S2 (B1) P1146 1146 2 × EC-446
CONSULT-II
GST*
DTC*
3
2
ECM*
Trip
MIL lighting
up
Reference page
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Revision; 2004 April 2003 G35 Coupe
EC-9
INDEX FOR DTC
1
Items
(CONSULT-II screen terms)
HO2S2 (B1) P1147 1147 2 × EC-458 HO2S2 (B2) P0158 0158 2 × EC-235 HO2S2 (B2) P0159 0159 2 × EC-245 HO2S2 (B2) P1166 1166 2 × EC-446 HO2S2 (B2) P1167 1167 2 × EC-458 HO2S2 HTR (B1) P0037 0037 2 × EC-154 HO2S2 HTR (B1) P0038 0038 2 × EC-154 HO2S2 HTR (B2) P0057 0057 2 × EC-154 HO2S2 HTR (B2) P0058 0058 2 × EC-154 I/C SOLENOID/CIRC P1752 1752 1 × AT-170 I/C SOLENOID FNCTN P1754 1754 1 × AT-175 IAT SEN/CIRCUIT P0112 0112 2 × EC-177 IAT SEN/CIRCUIT P0113 0113 2 × EC-177 IAT SENSOR P0127 0127 2 × EC-197 INT/V TIM CONT-B1 P0011 0011 2 × EC-143 INT/V TIM CONT-B2 P 0021 002 1 2 × EC-143 INT/V TIM V /CIR-B1 P111 1 1111 2 × EC-408 INT/V TIM V/CIR-B2 P1136 1136 2 × EC-408 ISC SYSTEM P0506 0506 2 × EC-392 ISC SYSTEM P0507 0507 2 × EC-394 KNOCK SEN/CIRC-B1 P0327 0327 2 — EC-296 KNOCK SEN/CIRC-B1 P0328 0328 2 — EC-296 L/PRESS SOL/CIRC P0745 0745 2 × AT-127
LC/B SOLENOID FNCT P1774 1774 1 × AT-213 LC/B SOLENOID/CIRC P1772 1772 1 × AT-208 MAF SEN/CIRCUIT P0101 0101 1 × EC-1 62 MAF SEN/CIRCUIT P0102 0102 1 × EC-1 70 MAF SEN/CIRCUIT P0103 0103 1 × EC-1 70 MULTI CYL MISFIRE P0300 0300 2 × EC-290 NATS MALFUNCTION P1610 - P1615 1610 - 1615 2 — EC-66 NO DTC IS DETECTED.
FURTHER TESTING MAY BE REQUIRED.
NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.
P-N POS SW/CIRCUIT P1706 1706 2 × EC-535 PNP SW/CIRC P0705 0705 2 × AT-105 PURG VOLUME CONT/V P0444 0444 2 × EC-335 PURG VOLUME CONT/V P0445 0445 2 × EC-335 PURG VOLUME CONT/V P1444 1444 2 × EC-495 PW ST P SEN/CIRC P0550 0550 2 — EC-396 SENSOR POWER/CIRC P1229 1229 1 × EC-490 TCC SOLENOID/CIRC P0740 0740 2 × AT-117
CONSULT-II
GST*
No DTC
P0000 0000 —— —
DTC*
3
2
ECM*
Flashing*
4
Trip
—
MIL lighting
up
Flashing*
4
Reference page
EC-67
Revision; 2004 April 2003 G35 Coupe
EC-10
INDEX FOR DTC
1
Items
(CONSULT-II screen terms)
TCS C/U FUNCTN P1211 1211 2 — EC-472 TCS/CIRC P1212 1212 2 — EC-473 THERMSTAT FNCTN P0128 0128 2 × EC-200 TP SEN 1/CIRC P0222 02 22 1 × EC-283 TP SEN 1/CIRC P0223 02 23 1 × EC-283 TP SEN 2/CIRC P0122 01 22 1 × EC-187 TP SEN 2/CIRC P0123 01 23 1 × EC-187 TP SEN/CIRC A/T P1705 1705 1 × AT-144 TP SENSOR P2135 21 35 1 × EC-564 TURBINE REV S/CIRC P1716 1716 2 × AT-152 TW CATALYST SYS-B1 P0420 0420 2 × EC-315 TW CATALYST SYS-B2 P0430 0430 2 × EC-315
VEH SPD SEN/CIR AT* VEH SPEED SEN/CIRC*
VENT CONTROL VALVE P0447 0447 2 × EC-342 VENT CONTROL VALVE P1446 1446 2 × EC-503
*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: When engine is running. *5: The troubleshooting for this DTC needs CONSULT-II. *6: When the fail-safe operations for both self-di agno ses occur, the MIL illuminates.
6
6
CONSULT-II
GST*
P0720 0720 2 × AT-110 P0500 0500 2 × EC-390
DTC*
3
2
ECM*
Trip
MIL lighting
up
Reference page
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Revision; 2004 April 2003 G35 Coupe
EC-11
INDEX FOR DTC

DTC No. Index ABS0036Y

NOTE: If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000, U1001. Refer to EC-140, "
1
DTC*
CONSULT-II
2
GST*
No DTC
U1000 U1001
P0000 0000
P0011 0011 INT/V TIM CONT-B1 2 × EC-143 P0021 0021 INT/V TIM CONT-B2 2 × EC-143 P0031 0031 HO2S1 HTR (B1) 2 × EC-146 P0032 0032 HO2S1 HTR (B1) 2 × EC-146 P0037 0037 HO2S2 HTR (B1) 2 × EC-154 P0038 0038 HO2S2 HTR (B1) 2 × EC-154 P0051 0051 HO2S1 HTR (B2) 2 × EC-146 P0052 0052 HO2S1 HTR (B2) 2 × EC-146 P0057 0057 HO2S2 HTR (B2) 2 × EC-154 P0058 0058 HO2S2 HTR (B2) 2 × EC-154 P0101 0101 MAF SEN/CIRCUIT 1 × EC-162 P0102 0102 MAF SEN/CIRCUIT 1 × EC-170 P0103 0103 MAF SEN/CIRCUIT 1 × EC-170 P011 2 0112 IAT SEN/CIRCUIT 2 × EC-177 P011 3 0113 IAT SEN/CIRCUIT 2 × EC-177 P0117 0117 ECT SEN/CIRCUIT 1 × EC-182 P0118 0118 ECT SEN/CIRCUIT 1 × EC-182 P0122 0122 TP SEN 2/CIRC 1 × EC-187 P0123 0123 TP SEN 2/CIRC 1 × EC-187 P0125 0125 ECT SENSOR 1 × EC-194 P0127 0127 IAT SENSOR 2 × EC-197 P0128 0128 THERMSTAT FNCTN 2 × EC-200 P0132 0132 HO2S1 (B1) 2 × EC-202 P0133 0133 HO2S1 (B1) 2 × EC-212 P0134 0134 HO2S1 (B1) 2 × EC-225 P0138 0138 HO2S2 (B1) 2 × EC-235 P0139 0139 HO2S2 (B1) 2 × EC-245 P0152 0152 HO2S1 (B2) 2 × EC-202 P0153 0153 HO2S1 (B2) 2 × EC-212 P0154 0154 HO2S1 (B2) 2 × EC-225 P0158 0158 HO2S2 (B2) 2 × EC-235
Flashing*
DTC U1000, U1001 CAN COMMUNICATION LINE" .
Items
ECM*
1000* 1001*
3
4
5
5
(CONSULT-II screen terms)
NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.
CAN COMM CIRCUIT 1 × EC-140 CAN COMM CIRCUIT 2 — EC-140
NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.
×:Applicable —: Not applicable
Trip
—
—— —
MIL lighting
up
Flashing*
4
Reference page
EC-67
Revision; 2004 April 2003 G35 Coupe
EC-12
1
DTC*
CONSULT-II
2
GST* P0159 0159 HO2S2 (B2) 2 × EC-245 P0171 0171 FUEL SYS-LEAN-B1 2 × EC-257 P0172 0172 FUEL SYS-RICH-B1 2 × EC-266 P0174 0174 FUEL SYS-LEAN-B2 2 × EC-257 P0175 0175 FUEL SYS-RICH-B2 2 × EC-266 P0181 0181 FTT SENSOR 2 × EC-274 P0182 0182 FTT SEN/CIRCUIT 2 × EC-279 P0183 0183 FTT SEN/CIRCUIT 2 × EC-279 P0222 0222 TP SEN 1/CIRC 1 × EC-283 P0223 0223 TP SEN 1/CIRC 1 × EC-283 P0300 0300 MULTI CYL MISFIRE 2 × EC-290 P0301 0301 CYL 1 MISFIRE 2 × EC-290 P0302 0302 CYL 2 MISFIRE 2 × EC-290 P0303 0303 CYL 3 MISFIRE 2 × EC-290 P0304 0304 CYL 4 MISFIRE 2 × EC-290 P0305 0305 CYL 5 MISFIRE 2 × EC-290 P0306 0306 CYL 6 MISFIRE 2 × EC-290 P0327 0327 KNOCK SEN/CIRC-B1 2 — EC-296 P0328 0328 KNOCK SEN/CIRC-B1 2 — EC-296 P0335 0335 CKP SEN/CIRCUIT 2 × EC-301 P0340 0340 CMP SEN/CIRC-B1 2 × EC-307 P0345 0345 CMP SEN/CIRC-B2 2 × EC-307 P0420 0420 TW CATALYST SYS-B1 2 × EC-315 P0430 0430 TW CATALYST SYS-B2 2 × EC-315 P0441 0441 EVAP PURG FLOW/M O N 2 × EC-320 P0442 0442 EVAP SMALL LEAK 2 × EC-325 P0444 0444 PURG VOLUME CONT/V 2 × EC-335 P0445 0445 PURG VOLUME CONT/V 2 × EC-335 P0447 0447 VENT CONTROL V ALVE 2 × EC-342 P0451 0451 EVAP SYS PRES SEN 2 × EC-349 P0452 0452 EVAP SYS PRES SEN 2 × EC-352 P0453 0453 EVAP SYS PRES SEN 2 × EC-358 P0455 0455 EVAP GROSS LEAK 2 × EC-366 P0456 0456 EVAP VERY SML LEAK 2 × EC-374 P0460 0460 FUEL LEV SEN SLOSH 2 × EC-384 P0461 0461 FUEL LEVEL SENSOR 2 × EC-386 P0462 0462 FUEL LEVL SEN/CIRC 2 × EC-388
P0500 0500 P0506 0506 ISC SYSTEM 2 × EC-392
P0507 0507 ISC SYSTEM 2 × EC-394 P0550 0550 PW ST P SEN/CIRC 2 — EC-396 P0605 0605 ECM 1 or 2 × or — EC-401
ECM*
INDEX FOR DTC
Items
3
(CONSULT-II screen terms)
VEH SPEED SEN/CIRC*
6
Trip
2 × EC-390
MIL lighting
up
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Revision; 2004 April 2003 G35 Coupe
EC-13
INDEX FOR DTC
1
DTC*
CONSULT-II
P1610 - P1615 1610 - 1615 NATS MALFUNCTION 2 — EC-66
2
GST* P0705 0705 PNP SW/CIRC 2 × AT-105 P0710 0710 ATF TEMP SEN/CIRC 2 × AT-146
P0720 0720 P0725 0725 ENGINE SPEED SIG 2 × AT-115
P0740 0740 TCC SOLENOID/CIRC 2 × AT-117 P0744 0744 A/T TCC S/V FNCTN 2 × AT-122 P0745 0745 L/PRESS SOL/CIRC 2 × AT-127 P1065 1065 ECM BACK UP/CIRCUIT 2 × EC-404
P1111 1111 INT/V TIM V /CIR-B1 2 × EC-408 P1121 1121 ETC ACTR 1 × EC-415 P1122 1122 ETC FUNCTION/CIRC 1 × EC-417 P1124 1124 ETC MOT PWR 1 × EC-423 P1126 1126 ETC MOT PWR 1 × EC-423 P1128 1128 ETC MOT 1 × EC-428 P1136 1136 INT/V TIM V/CIR-B2 2 × EC-408 P1143 1143 HO2S1 (B1) 2 × EC-433 P1144 1144 HO2S1 (B1) 2 × EC-439 P1146 1146 HO2S2 (B1) 2 × EC-446 P1147 1147 HO2S2 (B1) 2 × EC-458 P1148 1148 CLOSED LOOP-B1 1 × EC-470 P1163 1163 HO2S1 (B2) 2 × EC-433 P1164 1164 HO2S1 (B2) 2 × EC-439 P1166 1166 HO2S2 (B2) 2 × EC-446 P1167 1167 HO2S2 (B2) 2 × EC-458 P1168 1168 CLOSED LOOP-B2 1 × EC-470 P1211 1211 TCS C/U FUNCTN 2 — EC-472 P1212 1212 TCS/CIRC 2 — EC-473 P1217 1217 ENG OVER TEMP 1 × EC-474 P1225 1225 CTP LEARNING 2 — EC-486 P1226 1226 CTP LEARNING 2 — EC-488 P1229 1229 SENSOR POWER/CIRC 1 × EC-490 P1444 1444 PURG VOLUME CONT/V 2 × EC-495 P1446 1446 VENT CONTROL VALVE 2 × EC-503 P1564 1564 ASCD SW 1 — EC-510 P1572 1572 ASCD BRAKE SW 1 — EC-517 P1574 1574 ASCD VHL SPD SEN 1 — EC-533
P1705 1705 TP SEN/CIRC A/T 1 × AT-144 P1706 1706 P-N POS SW/CIRCUIT 2 × EC-535 P1716 1716 TURBINE REV S/CIRC 2 × AT-152 P1730 1730 A/T INTERLOCK 1 × AT-159 P1752 1 752 I/C SOLENOID/CIRC 1 × AT-170
ECM*
3
(CONSULT-II screen terms)
VEH SPD SEN/CIR AT*
Items
Trip
6
2 × AT-110
MIL lighting
up
Reference page
Revision; 2004 April 2003 G35 Coupe
EC-14
INDEX FOR DTC
1
DTC*
CONSULT-II
*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: When engine is running. *5: The troubleshooting for this DTC needs CONSULT-II. *6: When the fail-safe operations for both self-di agno ses occur, the MIL illuminates.
2
GST* P1754 1754 I/C SOLENOID FNCTN 1 × AT-175 P1757 1757 FR/B SOLENOID/CIRC 1 × AT-179 P1759 1759 FR/B SOLENOID FNCT 1 × AT-184 P1762 1762 D/C SOLENOID/CIRC 1 × AT-189 P1764 1764 D/C SOLENOID FNCTN 1 × AT-194 P1767 1767 HLR/C SOL/CIRC 1 × AT-198 P1769 1769 HLR/C SOL FNCTN 1 × AT-203 P1772 1772 LC/B SOLENOID/CIRC 1 × AT-208 P1774 1774 LC/B SOLENOID FNCT 1 × AT-213 P1805 1805 BRAKE SW/CIRCUIT 2 — EC-544 P2122 2122 APP SEN 1/CIRC 1 × EC-550 P2123 2123 APP SEN 1/CIRC 1 × EC-550 P2127 2127 APP SEN 2/CIRC 1 × EC-557 P2128 2128 APP SEN 2/CIRC 1 × EC-557 P2135 2135 TP SENSOR 1 × EC-564 P2138 2138 APP SENSOR 1 × EC-571
ECM*
3
(CONSULT-II screen terms)
Items
Trip
MIL lighting
up
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Revision; 2004 April 2003 G35 Coupe
EC-15

PRECAUTIONS

PRECAUTIONS PFP:00001 Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat be lt , helps t o redu ce the r is k or sev erity of inj ury to the d river and fro nt pass enge r for certain types of collisi on . Thi s s ys te m in cl udes seat belt switch inp uts an d du al stag e front air bag modules. T he SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. Information ne ce ss ary t o se rv ice th e sy st em saf ely is i ncl u de d in the S RS and SB se ct i on of th is Ser vi ce Ma n­ual.
WARNING:
● To avoid rendering the SRS inoperativ e, which cou ld increase the risk of persona l injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per­formed by an authorized NISSAN/INFINITI deale r.
● Improper maintenance , including incorrect removal and installation of the SRS, can le ad to per-
sonal injury caused by unintentional activati on of th e sy ste m. For removal of Spiral Ca ble an d Air Bag Module, see the SRS section.
● Do not use electrical test equipme nt on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring ha rnesses can be identified by yellow and/or orange ha rnesses or harness connectors.
ABS008G3

Precautions for Battery Service ABS00B3Q

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer­ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic window function will not work with the battery disconnected.

On Board Diagnostic (OBD) System of Engine and A/T ABS00371

The ECM has an on bo ard diagnostic system. It wil l light up the malfunction in dicator lam p (MIL) to warn the driver of a malfuncti on caus in g em is si on dete rioration.
CAUTION:
● Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any
repair or inspection work. Th e open/short circuit of related sw itches, sensors, solenoid valves, etc. will cause the MIL to light up.
● Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)
● Certain systems and componen ts, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-63, "
NESS CONNECTOR" .
● Be sure to route and secure the harn esses properly after work. The interferenc e of the harness
with a bracket, etc. may cause the MIL to light up due to the short cir c uit.
● Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up du e to the ma lfunc tio n of the EVAP system or fuel injection syste m, etc.
● Be sure to erase the unn ecessa ry malfunction information (repairs complete d) from the E CM and
TCM (Transmission control module) before returning the vehicle to the customer.
HAR-
Revision; 2004 April 2003 G35 Coupe
EC-16
PRECAUTIONS

Precaution ABS00372

● Always use a 12 volt battery as power source.
● Do not attempt to disco nne ct b atte ry c abl es while en gin e is
running.
● Before connecting or disconnectin g the ECM harnes s con-
nector, turn ignition switch OFF and disconnect battery ground cable. Failure to do so may damage the ECM because battery voltage is applie d to ECM even if ignition switch is turned OFF.
● Before removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
SEF289H
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● Do not disassemble E CM.
● If a battery cable is dis connected, the memory will return to
the ECM value. The ECM will now start to self-control at its initial value. Engine operation can vary slightly when the terminal is dis­connected. Howeve r, this is not an indication of a malfunc­tion. Do not replace parts because of a slight variation.
● When connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown at right.
● When connec ting or disconnecting pin connectors i nto or
from ECM, take care not to damage pin terminals (bend or break). Make sure that there are not a ny bends or breaks on ECM pin terminal, when connecting pin connectors.
● Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge) voltage to develop in co il and condenser, thus resulting in damage to ICs.
● Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys­tem malfunctions due to receiving exter nal noise, degraded operation of ICs, etc.
● Keep engine control system parts and harness dry.
PBIB1164E
SEC406D
PBIB0090E
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Revision; 2004 April 2003 G35 Coupe
EC-17
PRECAUTIONS
● Before replacing ECM, perform ECM Terminals and Refer-
ence Value inspection and make sure ECM functions p rop­erly. Refer to EC-98
● Handle mass air flow sensor carefully to avoid damage.
● Do not disassemble mass air flow sensor.
● Do not clean mass air flow se nsor with any type of deter-
gent.
● Do not disassemble electric throttle control actuator.
● Even a slight leak in the air intake system can cause seri-
ous incidents.
● Do not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
● After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check. The DTC should not be displa yed in the DTC Confirmation Procedure if the repair is completed. The Overall Fun ction Check should be a good result if the repair is completed.
.
MEF040D
● When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact. Accidental contact of probes will cause a short c ircuit and damage the ECM power transistor.
● Do not use ECM ground te rminals when measuring input/
output vol tage. Doing so may re sul t in da ma g e to th e E CM's transistor. Use a ground other than ECM terminals, such as the ground.
SEF217U
SEF348N
Revision; 2004 April 2003 G35 Coupe
EC-18
PRECAUTIONS
● B1 indicates the bank 1, B2 indicates the bank 2 as sho wn
in the figure.
● Do not operate fuel pump when there is no fuel in lines.
● Tighten fuel hose clamps to the specified torque.
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SEC893C
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PBIB1100E
● Do not depress accelerator pedal when starting.
● Immediately after starting, do not rev up engine unneces-
sarily.
● Do not rev up engine just prior to shutdown.
● When installing C.B. ham radio or a mobile phone, b e sure
to observe the following as it may adversely affect elec­tronic control systems depending on installation location.
– Keep the antenna as far as possible from the electronic
control units.
– Keep the antenna feeder lin e more than 20 cm (8 in) away
from the harness of electronic controls. Do not let them run parallel for a long distance.
– Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.
– Be sure to ground the radio to vehicle body.
SEF709Y
SEF708Y
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Wiring Diagrams and Trouble Diagnosis ABS00373

When you read wiring diagrams, refer to the following:
● GI-15, "How to Read Wiring Diagrams"
● PG-4, "POWER SUPPLY ROUTING CIRCUIT" for power distribution circuit
When you perform trouble dia gnosis, refer to the following:
● GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"
● GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident"
Revision; 2004 April 2003 G35 Coupe
EC-19

PREPARATION

PREPARATION PFP:00002 Special Service Tools ABS00374

The actual shapes of Kent-Moore tools may differ from those of spe ci al se rvice tools illustrated here.
Too l numbe r (Kent-Moore No.) Too l name
Description
KV10117100 (J36471-A) Heated oxygen sensor wrench
KV10114400 (J-38365) Heated oxygen sensor wrench
(J44321) Fuel pressure gauge kit
KV109E0010 (J-46209) Break-o ut box
Loosening or tightening heated oxygen sensors with 22 mm (0.87 in) hexagon nut
S-NT379
Loosening or tightening heated oxygen sensors
a: 22 mm (0.87 in)
S-NT636
Checking fuel pressure
LEC642
Measuring the ECM signals with a circuit teste r
KV109E0080 (J-45819) Y-cable adapter
EG17650301 (J-33984-A) Radiator cap tester adapter
S-NT825
Measuring the ECM signals with a circuit teste r
S-NT826
Adapting radiator cap tester to radiator cap and radiator filler neck
a: 28 (1.10) dia. b: 31.4 (1.236) dia. c: 41.3 (1.626) dia.
Unit: mm (in)
S-NT564
Revision; 2004 April 2003 G35 Coupe
EC-20
PREPARATION

Commercial Service Tools ABS00375

Tool nam e (Kent-Moore No.)
Description
A
Leak detector i.e.: (J41416)
S-NT703
EVAP service port adapter i.e.: (J41413-OBD)
S-NT704
Fuel filler cap adapter i.e.: (MLR-8382)
S-NT815
Socket wrench Removing and installing engine coolant
Locating the EVAP leak
Applying positive pressure through EVAP service port
Checking fuel tank vacuum relief valve opening pressure
temperature sensor
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Oxygen se nsor thre ad cleaner i.e.: (J-43897-18) (J-43897-12)
Anti-seize lubricant i.e.: (Permatex
133AR or equivalent meeting MIL specification MIL-A-
907)
TM
S-NT705
AEM488
S-NT779
Reconditioning the exhaust system th rea ds before installing a new oxygen sensor. Use with anti-seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for Zirconia Oxygen Sensor b: 12 mm diameter with pitch 1.25 mm for Titania Oxygen Sensor
Lubricating oxygen sensor thread cleaning tool when reconditioning exhaust system t hre ads.
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Revision; 2004 April 2003 G35 Coupe
EC-21

ENGINE CONTROL SYSTEM

ENGINE CONTROL SYSTEM PFP:23710 System Diagram ABS00376

PBIB1101E
Revision; 2004 April 2003 G35 Coupe
EC-22
ENGINE CONTROL SYSTEM

Vacuum Hose Drawing ABS00377

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PBIB1552E
Refer to EC-22, "System Diagram" for Vacuum Control System.
Revision; 2004 April 2003 G35 Coupe
EC-23
ENGINE CONTROL SYSTEM

System Chart ABS00378

Input (Sensor) ECM Function Output (Actuator)
● Cams haft position sen sor (PHASE)
● Crankshaft position sensor (POS)
● Ma ss ai r flow sensor
● Engine coolant temperature sensor
● He ated oxygen sensor 1
● Throttle position sensor
● Accel er at or ped al position sensor
● Park/neutral position (PNP) switch
● Intake air temperature sensor
● Pow er stee ring pr essure sensor
● Ign ition sw i tch
● Batter y voltage
● Knock sensor
● Refrigerant pressure sensor
● Stop lamp switch
● ASCD steering switch
● ASCD brake switch
● ASCD clutch switch
● Fuel level sensor*
● EVAP control system pressure sen sor
● Fuel tank temperature sensor*
● He ated oxygen sensor 2 *
● TC M (Transmission contr ol mo dul e) *
● Air conditioner switch*
● Wheel sensor*
● Electrical load signal*
*1: This sensor is not used to control the engine sys tem. This is used onl y fo r the on boar d dia gnosis.
1 *3
1
2
3
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3
3
*2: This sensor is not used to control the engine sys tem under normal conditions. *3: This input signal is sent to the ECM through CAN comm unicat i on line . *4: This output signal is sent from the ECM through CAN co mmunication line.
Fuel injection & mixture ratio control Fuel injec tors Electronic ignition system Power transistor
Fuel pump control
Fuel pump relay*
4
ASCD vehicle speed control Electric throttle control actuator On board diagnostic system
MIL (On the instrument panel)* Heated oxygen sensor 1 heater control Heated oxygen sensor 1 heater Heated oxygen sensor 2 heater control Heated oxygen sensor 2 heater
EVAP canister purge flow control
Air conditioning cut control Cooling fan control
EV AP canister purge volume control
solenoid valve
Air conditioner relay*
Cooling fan relays*
4
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ON BOARD DIAGNOSIS for EVAP system EVAP canister vent control valve
4
Revision; 2004 April 2003 G35 Coupe
EC-24
ENGINE CONTROL SYSTEM

Multiport Fuel Injection (MFI) System ABS00379

INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECM ECM function Actuato r Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Mass air flow sensor Am ount of intake air Engine coolant temperature sensor Engine coolant temperature Heated oxygen sensor 1 Densi ty of oxygen in exhaust gas Throttle position sensor Throttle position Accelerator pedal position sensor Accelerator pedal position Park/neutral position (PNP) swit ch Gear position Knock sensor Engine knocking condition
Battery Power steering pressure sensor Power steering operation
Heated oxygen sensor 2 * Air conditioner switch* Wheel sensor*
*1: Under normal conditions, this sensor is not for engi ne cont r ol opera tion. *2: This signal is sent to the ECM through CAN communi cat ion l ine . *3: ECM determines the start signal status by the signals of engine speed and battery voltage.
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Engine speed* Piston po sition
Battery voltage*
Density of oxygen in exhaust gas Air conditioner operation Vehicle speed
3
Fuel injection & mixture ratio control
3
Fuel injectors
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SYSTEM DESCRIPTION
The amount of fuel injecte d from th e fuel inject or is determ ined by t he ECM. The ECM cont rols the le ngth of time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the ECM memory. The program value is preset by engin e operati ng condi tions. Thes e condit ions are de termine d by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air flow sensor.
VA RIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amou nt of f uel in je cted is co mpen sate d to im prov e eng ine p erform ance unde r va rious op era t­ing conditions as list ed below.
<Fuel increase>
● During warm-up
● When starting the engine
● During acceleration
● Hot-engine operation
● When selector lev er is chan ge d from N to D (A/T models)
● High-load, high-speed operation
<Fuel decrease>
● During decelerati on
● During high engi ne speed operation
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Revision; 2004 April 2003 G35 Coupe
EC-25
ENGINE CONTROL SYSTEM
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
PBIB0121E
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control. The three way catalyst 1 can then better reduce CO, HC and NOx emissions. This system uses heated oxy­gen sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM adjusts the injection puls e wid th ac cordi ng to the sens or vo lta ge si gnal . For mo re inf ormat ion about he ated oxyge n sen sor 1, refer to EC-202 This stage is referred to as the closed loop control condition. Heated oxygen sen sor 2 is locate d dow nstre am of the th ree way catalys t 1. Eve n if the swi tchin g cha racte ris­tics of heated oxygen sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated oxygen sensor 2 .
Open Loop Cont rol
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback control stops in order to maintain stabilized fuel combustion.
● Deceleration and acce leration
● High-load, high-speed operation
● Malfunction of heated oxyg en sensor 1 or its circuit
● Insuffi c ient activation of heated oxygen sensor 1 at low engine coolant temperat ure
● High engine coolant temperature
● During warm-up
● After shifting from N to D (A/T models)
● When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated oxygen sensor 1. This feedb ack signal is then sent to the ECM. The ECM controls the basic mix ture ratio a s close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig­inally designed. Both manufacturing differences (i.e., mass air flow sensor hot film) and characteristic changes during operation (i.e., inj ector clogging ) directly affect mixture ratio. Accordingly, the diffe r ence be t wee n t he b as ic a nd th eor et ica l mi xtur e rat i os is moni t ore d i n t his s yst e m. Thi s i s then computed in terms of “injection pulse duration” to automatically compensate for the difference between the two ratios. “Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim includes short term fuel trim and long term fuel trim. “Short term fuel trim” is the sho rt-term fuel co mpensation u sed to maintain the mixture rati o at its theoret ical value. The sig nal fr om he ated oxyge n sen sor 1 in dica tes wh ethe r the m ixtu re ra tio i s RIC H or LEA N comp are d to the theoreti cal value . The sign al then tri ggers a red uction in fu el volume if the mixture rat io is rich, and an increase in fuel volume if it is lean. “Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation of the short t erm f uel tr i m f r om the ce nt ra l val ue. S uch de vi at ion wi l l occ ur du e to i nd i vi du al e ng in e differences, wear over time and chan ge s in the usa ge env iron m en t.
. This maint ains the mixture ratio within the range of stoichiometric (ideal air-fuel mixture).
Revision; 2004 April 2003 G35 Coupe
EC-26
FUEL INJECTION TIMING
ENGINE CONTROL SYSTEM
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SEF179U
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into e ach cylin der durin g each engine cycle a ccordi ng to the firing ord er. This system is use d when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all six cylinders twice each engine cycle. In other words, pulse signals of the same width are simultaneously transmitted from the ECM. The six injectors will then receive the signals two times for each engine cycle. This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.

Electronic Ignition (EI) System ABS0037A

INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECM ECM function Actuator Crankshaft position sensor (POS) Camshaft position sensor (PHAS E) Mass air flow sensor Amount of intake air Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle po sition Accelerator pedal position sensor Accelerator peda l positi on Knock sensor Engin e knocking Park/neutral position (PNP) switch G ear position
Battery Wheel sensor*
*1: This signal is sent to the ECM through CAN communi cat ion l ine . *2: ECM determines the start signal status by the signals of engine speed and battery voltage.
1
Engine speed* Piston position
Battery voltage* Vehicle speed
2
Ignition timing control
2
Power transistor
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SYSTEM DESCRIPTION
The ignition timing is controlled by the ECM to maintain the best air­fuel ratio for every run ning conditi on of the engin e. The ignition tim ­ing data is stored in the ECM. This data forms the map sh own. The ECM receives info rmati on such as th e inj ectio n pul se width a nd camshaft position sensor signal. Computing this information, ignition signals are transmitted to the power transistor. e.g., N: 1,80 0 rpm, Tp: 1.50 ms ec A °BTDC During the following conditions, the ignition timing is revised by the ECM according to the other data stored in the ECM.
● At starting
● During warm-up
Revision; 2004 April 2003 G35 Coupe
EC-27
SEF742M
ENGINE CONTROL SYSTEM
● At idle
● At low battery voltage
● During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed within the anti-k nockin g zone, if recomm ended f uel is us ed unde r dry cond itions. The retard sys tem doe s not operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition. The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

Air Conditioning Cut Control ABS0037B

INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECM ECM function Actuator
Air conditioner switch* Throttle position sensor Throttle position Accelerator pedal position sensor Accelerator pedal position Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine coolant temperature sensor Engine coolant temperature
Battery Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation Wheel sensor*
*1: This signal is sent to the ECM through CAN communication line. *2: ECM determines the start signal status by the signals of engine speed and battery voltage.
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Air conditioner ON signal
Engine speed*
Battery voltage*
Vehicle speed
2
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Air conditioner cut control
Air conditioner relay
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used. Under the following conditions, the air conditioner is turned off.
● When the accelerator pedal is fully depressed.
● When cranking the engine.
● At high engine speeds .
● When the engine coolant temperature becomes excessively high.
● When operating power steering during low engine speed or low vehicle speed.
● When engine speed is excessively low .
● When refrigerant pressure is excessively low or high.

Fuel Cut Control (at No Load and High Engine Speed) ABS0037C

INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECM ECM function Actuator Park/neutral position (PNP) switch Neut ra l positi on Throttle position sensor Throttle pos ition Accelerator pedal position sensor Accelerator pedal position Engine coolant temperature sensor Engine coolant temperature Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Wheel sensor* Vehicle speed
*: This signal is sent to the ECM through CAN communi cation line.
Engine speed
Fuel cut con­trol
Fuel injectors
SYSTEM DESCRIPTION
If the engine speed is above 1,8 00 rpm with no load (f or example, in neut ral and engine spee d over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed. Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.
Revision; 2004 April 2003 G35 Coupe
EC-28
ENGINE CONTROL SYSTEM
NOTE:
This function is different from deceleration control listed under Multiport Fuel Injection (MFI) System, EC-25
.
A

CAN communication ABS0037D

SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul­tiplex communication line with high data communication speed and excellent error detection ability. Many elec­tronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during opera tion (not independent). In CA N communication, cont rol units are connected with 2 communicatio n lines ( CAN H lin e, CAN L li ne) all owi ng a high ra te of in forma tion tr ans missi on wit h less wir ing. Each control unit transmits/receives data but selectiv ely reads requir ed data only.
CAN COMMUNICATION UNIT
Body type Coupe Axle 2WD Engine VQ35DE Transmission M/T A/T Brake control VDC
CAN commun ication unit ECM ×× TCM × Data link connector ×× Combination meter ×× BCM ×× Steering angle sensor ×× VDC/TCS/ABS control unit ×× IPDM E/R ×× CAN communication type EC-30
×: Applicable
EC-32
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Revision; 2004 April 2003 G35 Coupe
EC-29
ENGINE CONTROL SYSTEM
M/T Models
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive
Signals ECM
Engine speed signal T R R Engine coolant temperature signal T R Accelerator pedal position signal T R Fuel consumption monitor signal T R Air conditioner switch signal R T A/C compressor request signal T R A/C compressor feedback signal T R Blower fan motor switch signal R T Cooling fan motor operation signal T R Position lights request signal R T R Low beam request signal T R Low beam status signal R R T
High beam request signal R T R High beam status signal R R T Front fog lights request signal T R
Vehicle speed signal
Sleep request 1 signal R T Sleep request 2 signal T R Wake up request 1 signal R T Wake up request 2 signal R T Door switch signal (without navigation system) R T R Door switch signal (with navigation system) T R Turn indicator signal R T Seat belt buckle switch signal T R Oil pressure switch signal R T Buzzer output signal R T Trunk switch signal R T Malfunction indicator lamp signal T R ASCD SET lamp signal T R ASCD CRUISE lamp signal T R
RTR
Combina-
tion meter
RT
BCM
Steering
angle sen-
sor
VDC/TCS/
ABS con-
trol unit
SKIA4474E
IPDM E/R
Revision; 2004 April 2003 G35 Coupe
EC-30
ENGINE CONTROL SYSTEM
Signals ECM
Fuel level sensor signal R T Front wiper request signal T R Front wiper stop position signal R T Rear window defogger switch signal T R Rear window defogger control signal R R T Hood switch signal R T Theft warning horn request signal T R Horn chirp signal T R Steering angle sensor signal T R
Combina­tion meter
BCM
Steering
angle sen-
sor
VDC/TCS/
ABS con-
trol unit
IPDM E/R
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Revision; 2004 April 2003 G35 Coupe
EC-31
ENGINE CONTROL SYSTEM
A/T Models
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive
Signals ECM TCM
Engine speed signal T R R R Engine coolant temperature signa l T R R Accelerator pedal position signal T R R Closed throttle position signal T R Wide open throttle position signal T R Battery voltage signal T R Stop lamp switch R T Fuel consumption monitor signa l T R A/T self-diagnosis signal R T A/T CHECK indicator lamp signal T R A/T position indicator signal T R R ABS operation signal R T
A/T shift schedule change demand signal
Air conditioner switch signal R T A/C compressor request signal T R A/C compressor feedback si gnal T R Blower fan motor switch signal R T Cooling fan motor operation signal T R Position lights request signal R T R Low beam request signal T R Low beam status signal R R T High beam request signal R T R High beam status signal R R T Front fog lights request signal T R
Vehicle speed signal
Sleep request 1 signal R T Sleep request 2 signal T R Wake up request 1 signal R T Wake up request 2 signal R T
RRT R
RT
Combina­tion meter
RT
BCM
Steering
angle
sensor
VDC/TCS/
ABS con-
trol unit
SKIA1880E
IPDM E/R
Revision; 2004 April 2003 G35 Coupe
EC-32
ENGINE CONTROL SYSTEM
Signals ECM TCM
Door switch signal (without naviga­tion system)
Door switch signal (with navigation system)
Turn indicator signal R T Seat belt buckle switch signal T R Oil pressure switch signal R T Buzzer output signal R T Trunk switch signal R T Malfunction indicator lamp signal T R ASCD SET lamp signal T R ASCD CRUISE lamp signal T R Fuel level sensor signal R T Output shaft revolution signal R T Turbine revolution signal R T Front wiper request signal T R Front wiper stop position signal R T Rear window defogger switch signal T R Rear window defogger control sig-
nal Manual mode signal R T Not manual mode signal R T Manual mode shift up signal R T Manual mode shift down signal R T Manual mode indicator signal T R
Hood switch signal R T Theft warning horn request signal T R Horn chirp signal T R Steering angle sensor signal TR
RRT
Combina­tion meter
RT R
TR
BCM
Steering
angle
sensor
VDC/TCS/
ABS con-
trol unit
IPDM E/R
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Revision; 2004 April 2003 G35 Coupe
EC-33
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BASIC SERVICE PROCEDURE

BASIC SERVICE PROCEDURE PFP:00018 Idle Speed and Ignition Timing Check ABS0037E

IDLE SPEED
With CONSULT-II
Check idle speed in “DATA MONITOR” mode with CONSULT-II.
SEF058Y
With GST
Check idle speed with GST.
IGNITION TIMING
Any of following two methods may be used.
Method A
1. Attach timing light to loop wire as shown.
2. Check ignition timing.
Method B
1. Remove No. 1 ignition coil.
PBIB1287E
PBIB1019E
2. Connect No. 1 ignition coil and No. 1 spark plug with suitable high-tension wire as s ho wn, and attach timing li gh t c lam p to this wire.
PBIB1097E
Revision; 2004 April 2003 G35 Coupe
EC-34
BASIC SERVICE PROCEDURE
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EC
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SEF166Y
3. Check ignition timing.

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment ABS0037F

PREPARATION
1. Make sure that the following parts are in good order.
● Battery
● Ignition system
● Engine oil and coolant levels
● Fuses
● ECM harness connector
● Vacuum hoses
● Air intake system
(Oil filler cap, oil level gauge, etc.)
● Fuel pressure
● Engine compression
● Throttle valve
● Evaporative emission system
2. On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
3. On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift lever is in N position.
4. When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn off headlamp, heater blower, rear window defogger.
6. Keep front wheels pointed straight ahead.
PBIB1655E
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Revision; 2004 April 2003 G35 Coupe
EC-35
BASIC SERVICE PROCEDURE
OVERALL INSPECTION SEQUENCE
PBIB1054E
Revision; 2004 April 2003 G35 Coupe
EC-36
BASIC SERVICE PROCEDURE
INSPECTION PROCEDURE
1. INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.
2. Open engine hood and check the following:
– Harness connectors for improper connections – Wiring harness for improper connections, pinches and cut – Vacuum hoses for splits, kinks and improper connections – Hoses and ducts for leaks – Air cleaner clogging – Gasket
3. Confirm that electrical or mechanical loads ar e not applied.
– Head lamp switch is OFF. – Air conditioner switch is OFF. – Rear window defogger switch is OFF. – Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge. Ensure engine stays below 1,000 rpm.
SEF983U
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5. Run engine at about 2,000 rpm for ab out 2 minutes under no -
load.
6. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK >> GO TO 3. NG >> GO TO 2.
2. REPAIR OR REPLACE
Repair or re place components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
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Revision; 2004 April 2003 G35 Coupe
EC-37
BASIC SERVICE PROCEDURE
3. CHECK TARGET IDLE SPEED
With CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no­load, then run engine at idle speed for about 1 minute.
3. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
SEF978U
Without CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engin e ( 2,0 00 t o 3 ,00 0 r pm ) tw o or t hre e t i mes unde r no -lo ad , then r un en gine at i dl e s peed fo r ab out 1 minute.
3. Check idle speed.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
OK or NG
OK >> GO TO 10. NG >> GO TO 4.
4. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-46, "
>> GO TO 5.
Accelerator Pedal Released Position Learning" .
5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-46, "
Throttle Valve Closed Position Learning" .
SEF058Y
>> GO TO 6.
Revision; 2004 April 2003 G35 Coupe
EC-38
BASIC SERVICE PROCEDURE
6. PERFORM IDLE AIR VOLUME LEARNING
Perform EC-46, "
Is Idle Air Volume Learning carried out successfully?
YES or NO
YES >> GO TO 7. NO >> 1. Follow the instruction of Idle Air Volume Learning.
Idle Air Volume Learning" .
2. GO TO 4.
7. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
OK or NG
OK >> GO TO 10. NG >> GO TO 8.
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8. DETECT MALFUNCTIONING PART
Check the followin g.
● Check camshaft position sensor (PHASE) and circuit. Refer to EC-307 .
● Check crankshaft position sensor (POS) and circuit. Refer to EC-301 .
OK or NG
OK >> GO TO 9. NG >> 1. Repair or replace.
2. GO TO 4.
9. CHECK ECM FUNCTION
1. Substitute another kno wn-good ECM to check ECM function. (E CM may be the cause o f a incide nt, but this is the rarely the case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to BL-
124, "ECM Re-Communicating Function" .
>> GO TO 4.
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Revision; 2004 April 2003 G35 Coupe
EC-39
BASIC SERVICE PROCEDURE
10. CHECK IGNITION TIMING
1. Run engine at idle.
2. Check ignition timing with a timing light.
A/T: 15 ± 5° BTDC (in P or N position) M/T: 15 ± 5° BTDC (in N position)
OK or NG
OK (With CONSULT-II)>>GO TO 19. OK (Without CONSULT-II)>>GO TO 20. NG >> GO TO 11.
11. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-46, "
>> GO TO 12.
Accelerator Pedal Released Position Learning" .
PBIB1655E
12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-46, "
>> GO TO 13.
Throttle Valve Closed Position Learning" .
13. PERFORM IDLE AIR VOLUME LEARNING
Perform EC-46, "
Is Idle Air Volume Learning carried out successfully?
YES or NO
YES >> GO TO 14. NO >> 1. Follow the instruction of Idle Air Volume Learning.
Idle Air Volume Learning" .
2. GO TO 4.
14. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
OK or NG
OK >> GO TO 15. NG >> GO TO 17.
Revision; 2004 April 2003 G35 Coupe
EC-40
BASIC SERVICE PROCEDURE
15. CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
A/T: 15 ± 5° BTDC (in P or N position) M/T: 15 ± 5° BTDC (in N position)
OK or NG
OK (With CONSULT-II)>>GO TO 19. OK (Without CONSULT-II)>>GO TO 20. NG >> GO TO 16.
16. CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-50, " OK or NG
OK >> GO TO 17. NG >> 1. Repair the timing chain installation.
2. GO TO 4.
TIMING CHAIN" .
17. DETECT MALFUNCTIONING PART
Check the followin g.
● Check camshaft position sensor (PHASE) and circuit. Refer to EC-307 .
● Check crankshaft position sensor (POS) and circuit. Refer to EC-301 .
OK or NG
OK >> GO TO 18. NG >> 1. Repair or replace.
2. GO TO 4.
18. CHECK ECM FUNCTION
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1. Substitute another kno wn-good ECM to check ECM function. (E CM may be the cause o f a incide nt, but this is the rarely the case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to BL-
124, "ECM Re-Communicating Function" .
>> GO TO 4.
Revision; 2004 April 2003 G35 Coupe
EC-41
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BASIC SERVICE PROCEDURE
19. CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL
With CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuate s between LEAN and RICH more than 5 tim es during 10 seconds.
1 time: RICH → LEAN → RICH 2 times: RICH → LEAN → RICH → LEAN → RICH
OK or NG
OK >> GO TO 21. NG (Monitor does not fluctuate. )>>GO TO 23. NG (Monitor fluctuates less than 5 times.)>>GO TO 31.
PBIB0120E
20. CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL
Without CONSULT-II
1. Stop engine and set ECM to Self-diagn ostic mode II (Heated oxyge n sensor 1 monito r). Refer to EC-68,
"HOW TO SWITCH DIAGNOSTIC TEST MODE" .
2. Start engine and run it at about 2,000 rpm for about 2 minutes under no-load.
3. Running en gi n e at 2, 00 0 rpm und er no -l oa d (Th e en gi n e is wa rme d up to norm al ope r ati ng tem pe rat u re. ), check that the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK >> GO TO 22. NG (MIL does not come on)>>GO TO 23. NG (MIL comes on less than 5 times)>>GO TO 31.
21. CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL
With CONSULT-II
1. See “HO2S1 MNTR (B2)” in “DATA MONITOR” mode.
2. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuate s between LEAN and RICH more than 5 tim es during 10 seconds.
1 time: RICH → LEAN → RICH 2 times: RICH → LEAN → RICH → LEAN → RICH
OK or NG
OK >> INSPECTION END NG (Monitor does not fluctuate. )>>GO TO 24. NG (Monitor fluctuates less than 5 times.)>>GO TO 31.
PBIB0120E
Revision; 2004 April 2003 G35 Coupe
EC-42
BASIC SERVICE PROCEDURE
22. CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL
Without CONSULT-II
1. Switch the mon itored sensor from ba nk 1 to bank 2. Refer to EC-68, "
From Bank 1 to Bank 2 or Vice Versa" .
2. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK >> INSPECTION END NG (MIL does not come on)>>GO TO 24. NG (MIL comes on less than 5 times)>>GO TO 31.
How to Switch Monitored Sensor
23. CHECK HEATED OXYGEN SENSOR 1 (BANK 1) HARNESS
1. Turn ignition switch OFF and disc on ne ct ba tte ry gro un d ca ble .
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen s ensor 1 (bank 1) harness connector.
4. Check harnes s continuity between ECM terminal 35 an d heated oxygen sensor 1 (bank 1) terminal 1. Refer to Wiring Diagram, EC-204, "
Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 25. NG >> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).
2. GO TO 4.
BANK 1" .
24. CHECK HEATED OXYGEN SENSOR 1 (BANK 2) HARNESS
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1. Turn ignition switch OFF and disc on ne ct ba tte ry gro un d ca ble .
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen s ensor 1 (bank 2) harness connector.
4. Check harnes s continuity between ECM terminal 16 an d heated oxygen sensor 1 (bank 2) terminal 1. Refer to Wiring Diagram, EC-206, "
Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 25. NG >> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).
2. GO TO 4.
BANK 2" .
25. PERFORM ACCELERA TOR PEDAL RELEASED POSITION LEARNING
1. Reconnect ECM har ness connector.
2. Perform EC-46, "
>> GO TO 26.
Accelerator Pedal Released Position Learning" .
26. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-46, "
Throttle Valve Closed Position Learning" .
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>> GO TO 27.
Revision; 2004 April 2003 G35 Coupe
EC-43
BASIC SERVICE PROCEDURE
27. PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-46, "
Is Idle Air Volume Learning carried out successfully?
YES or NO
YES (With CONSULT-II)>>GO TO 28. YES (Without CONSULT-II)>>GO TO 29. NO >> 1. Follow the instruction of Idle Air Volume Learning.
Idle Air Volume Learning" .
2. GO TO 4.
28. CHECK CO%
With CONSULT-II
1. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Select “ENG COOLANT TEMP” in “ACTIVE TEST” mode.
4. Set “ENG COOLANT TEMP” to 5°C (41°F) by touching “DWN” and “Qd”.
5. Start engine and rev it (2,000 to 3,000 rpm) two or thre e times under no-load, then run engine at idle spee d.
6. Check CO%.
Idle CO: 0.7 − 9.9% and engine runs smoothly.
OK or NG
OK >> GO TO 31. NG >> GO TO 30.
SEF172Y
29. CHECK CO%
Without CONSULT-II
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Turn ignition switch OFF.
3. Disconnect engine coolant temperature sensor harness connector.
4. Connec t a resistor (4. 4 kΩ) between terminals of en gin e c oo lan t temperature sensor harness connector.
5. Start engine and rev it (2,000 to 3,000 rpm) two or thre e times under no-load, then run engine at idle spee d.
6. Check CO%.
Idle CO: 0.7 − 9.9% and engine runs smoothly.
7. After checking CO%, turn ignition switch OFF, disconnect the resistor from th e ter mi nal s of en gi ne co ol an t tem pe r atur e senso r harness connector, and then connect engine coolant tempera­ture sensor harness connector to engine coolant temperature sensor.
OK or NG
OK >> GO TO 31. NG >> GO TO 30.
30. RECONNECT HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR
SEF982UA
1. Turn ignition switch OFF.
2. Reconnec t heated oxygen sensor 1 harness con nector.
>> GO TO 34.
Revision; 2004 April 2003 G35 Coupe
EC-44
BASIC SERVICE PROCEDURE
31. REPLACE HEATED OXYGEN SENSOR 1
1. Stop engine.
2. Replace heated oxygen sensor 1 on the malfunctioning bank.
With CONSULT-II>>GO TO 32. Without CONSULT-II>>GO TO 33.
32. CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL
With CONSULT-II
1. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2. See “HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.
1 time: RICH → LEAN → RICH 2 times: RICH → LEAN → RICH → LEAN → RICH
OK or NG
OK >> GO TO 4. NG >> GO TO 34.
33. CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL
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Without CONSULT-II
1. Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to EC-68, "
SWITCH DIAGNOSTIC TEST MODE" .
2. Switch the monitored sensor to the malfunctioning bank. Refer to EC-68, "
sor From Bank 1 to Bank 2 or Vice Versa" .
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK >> GO TO 4. NG >> GO TO 34.
How to Switch Monitored Sen-
HOW TO
34. DETECT MALFUNCTIONING PART
Check the followin g.
● Check fuel pressure regulator and repair or replace if necessary. Refer to EC-48, "Fuel Pressure Check" .
● Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to EC-162 and EC-
170 .
● Check injector and its circuit, and repair or replace if necessary. Refer to EC-592 .
● Check eng ine co olant te mper ature sens or a nd its c ircuit, an d repair or rep lace if n ece ssary. Refer to EC-
182 and EC-194 .
OK or NG
OK >> GO TO 36. NG >> 1. Repair or replace.
2. GO TO 35.
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Revision; 2004 April 2003 G35 Coupe
EC-45
BASIC SERVICE PROCEDURE
35. ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC might be disp layed. Erase the stored me mory in ECM and TCM . Refe r to EC-64, "
NOSTIC INFORMATION" and AT-38, "HOW TO ERASE DTC" .
>> GO TO 4.
HOW TO ERASE EMISSION-RELATED DIAG-
36. CHECK ECM FUNCTION
1. Substitute another kn own-good ECM to chec k ECM function. (ECM may be the cause of a incident , but this is the rarely the case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to BL-
124, "ECM Re-Communicating Function " .
>> GO TO 4.

Accelerator Pedal Released Position Learning ABS0037G

DESCRIPTION
Accelerator Peda l Released Posit ion Learning is a n op eration to learn the fully r ele ased position of the accel­erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time harness connec tor of accelerator pedal position sensor or ECM is disconnected.
OPERATION PROCEDURE
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON and wait at least 2 seconds.
3. Turn ignition s witch OFF wait at least 10 seconds.
4. Turn ignition switch ON and wait at least 2 seconds.
5. Turn ignition s witch OFF wait at least 10 seconds.

Throttle Valve Closed Position Learning ABS0037H

DESCRIPTION
Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by
monitoring the thro ttle position sensor output signal. It must be performed eac h time harness connector of electric throttle control actuator or ECM is disconnected.
OPERATION PROCEDURE
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON.
3. Turn ignition s witch OFF wait at least 10 seconds. Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

Idle Air Volume Learning ABS0037I

DESCRIPTION
Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific range. It must be performed under any of the following conditions:
● Each time electric throttle control actuator or ECM is replaced.
● Idle speed or ignition timing is out of specification.
PREPARATION
Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied. Learning will be cancelled if any of the follow ing conditions are missed for even a moment.
● Battery voltage: More than 12.9V (At idle)
● Engine coolant temperature: 70 - 100°C (158 - 212°F)
● PNP switch: ON
● Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
Revision; 2004 April 2003 G35 Coupe
EC-46
BASIC SERVICE PROCEDURE
On vehicles equi pped with daytime light syste ms, set lighting switch t o the 1st position to light only small lamps.
● Steering wheel: Neutral (Straight-ahead position)
● Vehicle speed: Stopped
● Transmission: Warmed-up
For models with CONSULT-II, drive vehicle un til “FLUID TEMP SE” in “DATA MONITOR” mo de of “A/T” system indicates less than 0.9V. For models without CONSULT-II, drive vehicle for 10 minutes.
OPERATION PROCEDURE
With CONSULT-II
1. Perform EC-46, "Accelerator Pedal Released Position Learning" .
2. Perform EC-46, "
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
Throttle Valve Closed Position Learning" .
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6. Touch “ST ART” and wait 20 seconds.
7. Make sure t hat “CMP LT” is displayed on CON SULT-II screen. If “CMPLT” is not displayed, Idle Air Volume Learning will not be carried out succe ssfully. In this case, find the cause of th e inci­dent by referr ing to the Diagn ostic Procedure below.
8. Rev up the engi ne two or three times and make sure th at idle speed and ignition timing are within the specifications.
ITEM SPECIFICATION Idle spee d A/T: 650±50 rpm (in P or N position)
M/T: 650±50 rpm (in N position)
Ignition timing A/T: 15±5° BTDC (in P or N position)
M/T: 15±5° BTDC (in N position)
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MBIB0238E
Without CONSULT-II
NOTE:
● It is better to count the time accurately with a clock.
● It is impossible to swi tch the diagnostic mode when an accelerator pedal position se nsor circuit
has a malfunction.
Revision; 2004 April 2003 G35 Coupe
EC-47
BASIC SERVICE PROCEDURE
1. Perform EC-46, "Accelerator Pedal Released Position Learning" .
2. Perform EC-46, "
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic PREPARA TION (previously mentioned) are in good order.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7. Repeat the following procedure quickly five times within 5 second s. a. Fully depress the accelerator pedal. b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the acceler ator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
Throttle Valve Closed Position Learning" .
SEC897C
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.
ITEM SPECIFICATION Idle speed A/T: 650±50 rpm (in P or N position)
M/T: 650±50 rpm (in N position)
Ignition timing A/T: 15±5° BTDC (in P or N position)
M/T: 15±5° BTDC (in N position)
13. If idle speed and ignition timi ng are not w ithi n the speci ficat ion , Idl e Air Volume Learning will no t be ca rrie d out successfully. In this case, find the cause of the incident by referr ing to the DIAGNOSTIC PROCE­DURE below.
DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1. Check that throttle valve is fully closed.
2. Check PCV valve operati on.
3. Check that downstream of throttle valve is free from air leakage.
4. When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident. It is useful to perform EC-128, "
5. If any of the following condition s occur after the engine has started, eliminate the cause of the incident and perform Idle air volume learning all over again:
● Engine stalls.
● Erroneous idle.
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

Fuel Pressure Check ABS0037J

FUEL PRESSURE RELEASE
With CONSULT-II
1. Turn ignition switch ON.
Revision; 2004 April 2003 G35 Coupe
EC-48
BASIC SERVICE PROCEDURE
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank it two or three t imes to rel ease all fu el pressure.
5. Turn ignition switch OFF.
Without CONSULT-II
1. Remove fuel pump fuse located in IPDM E/R.
2. Start engine.
3. After engine stalls, crank it two or three t imes to rel ease all fu el pressure.
4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.
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FUEL PRESSURE CHECK
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger. NOTE:
● Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel
pressure cannot be completely released because V35 models do not have fuel return system.
● Use Fuel Pressure Gauge Kit (J-44321) to check fuel pressure.
1. Release fuel pressure to zero. Refer to EC-48, "
2. Install the inline fuel quick disconnected fitting between fuel
damper and inj ector tube.
3. Connect the fuel pressure test gauge (quick connector adapter hose) to the inline fuel quick disconnected fitting.
4. Turn ignition switch ON and check for fuel leakage.
5. Start engine and check for fuel leakage.
6. Read the indication of fuel pressure gauge.
At idling:
Approximat ely 350 kPa (3.57 kg/cm
7. If result is unsatisfactory, go to next step.
8. Check the following.
● Fuel hoses and fuel tubes for clogging
● Fuel filter for clogging
● Fuel pump
● Fuel pressure regulator for clogging
If OK, replace fuel pressure regulator. If NG, repair or replace.
FUEL PRESSURE RELEASE" .
2
, 51 psi)
PBIB1094E
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Revision; 2004 April 2003 G35 Coupe
EC-49

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM PFP:00028 Introduction ABS0037K

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua­tors. The ECM also records various emission-related diagnostic information including:
Emission-related diagnostic information SAE Mode Diagnostic Trouble Code (DTC) Mode 3 of SAE J1979 Freeze Frame data Mode 2 of SAE J1979 System Readiness Test (SRT) code Mode 1 of SAE J1979 1st Trip Diagnostic Trouble Code (1st Trip DTC) Mode 7 of SAE J1979 1st Trip Freeze Frame data Test values and Tes t limits Mode 6 of SAE J1979 Calibration ID Mode 9 of SAE J1979
The above information can be checked using procedures listed in the table below.
×: Applicable —: Not applicable
DTC 1st trip DTC
CONSULT-II ×× × × ×— GST ××*1 × — ×× ECM ××*2 — — — —
Freeze Frame
data
1st trip Freeze
Frame data
SRT code Test value
*1: 1st trip DTCs for self-diagnoses concerning SRT items can not be show n on the G S T displ ay. *2: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-80

Two Trip Detection Logic ABS0037L

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the ECM memory. The MIL will not light up at this stage. <1st trip> If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights u p. The MIL ligh ts up at the same tim e when the DTC is stored. <2nd trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable
MIL DTC 1st trip DTC
Items
Misfire (Possible three way cata­lyst damage) — DTC: P0300 ­P0306 is being detected
Misfire (Possible three way cata­lyst damage) — DTC: P0300 ­P0306 is being detected
One trip detection diagnoses (Refer to EC-8
Except above — — — × — ××—
.)
1st trip 2nd trip
Blinking
× ———— — × —
—— × —— × ——
— × —— × ———
Lighting
up
Blinking
Lighting
up
1st trip
displaying
2nd trip
displaying
1st trip
displaying
.)
2nd trip display-
ing
When there is an open circuit on MIL circuit, the ECM c a nn ot w arn th e d riv er by lighting MI L u p w he n the re is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM war ns the dr ive r that engin e cont rol sy stem malfun cti ons an d MIL ci rcuit is op en by m eans of operating fail-safe function.
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EC-50
ON BOARD DIAGNOSTIC (OBD) SYSTEM
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the driver to repair the malfunction.
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
A

Emission-Related Diagnostic Information ABS0037M

EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
1
2
DTC*
ECM*
1000* 1001*
3
6
6
SRT code
———EC-140 —— × EC-140
Items
(CONSULT-II scr een t erms)
CAN COMM CIRCUIT U1000 CAN COMM CIRCUIT U1001
NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.
INT/V TIM CONT-B1 P0011 0011 — — × EC-143 INT/V TIM CONT-B2 P0021 0021 — — × EC-143
HO2S1 HTR (B1) P0031 0031 ×× HO2S1 HTR (B1) P0032 0032 ×× HO2S2 HTR (B1) P0037 0037 ×× HO2S2 HTR (B1) P0038 0038 ×× HO2S1 HTR (B2) P0051 0051 ×× HO2S1 HTR (B2) P0052 0052 ×× HO2S2 HTR (B2) P0057 0057 ×× HO2S2 HTR (B2) P0058 0058 ××
MAF SEN/CIRCUIT P0101 0101 — — — EC-162 MAF SEN/CIRCUIT P0102 0102 — — — EC-170 MAF SEN/CIRCUIT P0103 0103 — — — EC-170
IA T SEN/CIRCUIT P0112 0112 — — × EC- 177 IA T SEN/CIRCUIT P0113 0113 — — × EC- 177 ECT SEN/CIRCUIT P0117 0117 — — — EC-182 ECT SEN/CIRCUIT P0118 0118 — — — EC-182 TP SEN 2/CIRC P0122 01 22 — — — EC-187 TP SEN 2/CIRC P0123 01 23 — — — EC-187 ECT SENSOR P0125 0125 — — — EC-194 IAT SENSOR P0127 0127 — — × EC-197 THERMSTAT FNCTN P0128 0128 — — × EC-200
HO2S1 (B1) P0132 0132 ×× HO2S1 (B1) P0133 0133 ×× HO2S1 (B1) P0134 0134 ×× HO2S2 (B1) P0138 0138 ×× HO2S2 (B1) P0139 0139 ×× HO2S1 (B2) P0152 0152 ×× HO2S1 (B2) P0153 0153 ×× HO2S1 (B2) P0154 0154 ××
CONSULT-II
GST*
P0000 0000 ————
Tes t value /
Test limit
(GST only)
1st trip DTC
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
Reference
page
EC-146 EC-146 EC-154 EC-154 EC-146 EC-146 EC-154 EC-154
EC-202 EC-212 EC-225 EC-235 EC-245 EC-202 EC-212 EC-225
EC
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
1
2
DTC*
ECM*
3
SRT code
Items
(CONSULT-II screen terms)
CONSULT-II
GST*
HO2S2 (B2) P0158 0158 ×× HO2S2 (B2) P0159 0159 ××
FUEL SYS-LEAN-B1 P0171 0171 — — × EC-257 FUEL SYS-RICH-B1 P0172 0172 — — × EC-266 FUEL SYS-LEAN-B2 P0174 0174 — — × EC-257 FUEL SYS-RICH-B2 P0175 0175 — — × EC-266 FTT SENSOR P0181 0181 — — × EC-274 FTT SEN/CIRCUIT P0182 0182 — — × EC-279 FTT SEN/CIRCUIT P0183 0183 — — × EC-279 TP SEN 1/CIRC P0222 0222 — — — EC-283 TP SEN 1/CIRC P0223 0223 — — — EC-283 MULTI CYL MISFIRE P0300 0300 — — × EC-29 0 CYL 1 MISFIRE P0301 0301 — — × EC-290 CYL 2 MISFIRE P0302 0302 — — × EC-290 CYL 3 MISFIRE P0303 0303 — — × EC-290 CYL 4 MISFIRE P0304 0304 — — × EC-290 CYL 5 MISFIRE P0305 0305 — — × EC-290 CYL 6 MISFIRE P0306 0306 — — × EC-290 KNOCK SEN/CIRC-B1 P0327 0327 — — × EC-296 KNOCK SEN/CIRC-B1 P0328 0328 — — × EC-296 CKP SEN/CIRCUIT P0335 0335 — — × EC-301 CMP SEN/CIRC-B1 P034 0 0340 — — × EC-307 CMP SEN/CIRC-B2 P034 5 0345 — — × EC-307
TW CATALYST SYS-B1 P0420 0420 ×× TW CATALYST SYS-B2 P0430 0430 ×× EVAP PURG FLOW/MON P0441 0441 ×× EVAP SMALL LEAK P0442 0442 ×× PURG VOLUME CONT/V P0444 0444 — — × EC-335
PURG VOLUME CONT/V P0445 0445 — — × EC-335 VENT CONTROL VALVE P0447 0447 — — × EC-34 2 EVAP SYS PRES SEN P0451 0451 — — × EC-349 EVAP SYS PRES SEN P0452 0452 — — × EC-352 EVAP SYS PRES SEN P0453 0453 — — × EC-358
EVAP GROSS LEAK P0455 0455 — × EVAP VERY SML LEAK P0456 0456
4
×* FUEL LEV SEN SLOSH P0460 0460 — — × EC-384 FUEL LEVEL SENSOR P0461 0461 — — × EC-386 FUEL LEVL SEN/CIRC P0462 0462 — — × EC-388
VEH SPEED SEN/CIRC*
7
P0500 0500 — — × EC-390
ISC SYSTEM P0506 0506 — — × EC-392 ISC SYSTEM P0507 0507 — — × EC-394
Test val ue/
Test limit
(GST only)
×
1st trip DTC
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
Reference
page
EC-235 EC-245
EC-315 EC-315 EC-320 EC-325
EC-366 EC-374
Revision; 2004 April 2003 G35 Coupe
EC-52
ON BOARD DIAGNOSTIC (OBD) SYSTEM
1
2
DTC*
3
ECM*
1610 - 1615 — — × EC-66
SRT code
Items
(CONSULT-II scr een t erms)
PW ST P SEN/CIRC P0550 0550 — — × EC-396 ECM P0605 0605 — — × or — EC-401 PNP SW/CIRC P0705 0705 — — × AT-105 ATF TEMP SEN/CIRC P0710 0710 — — × AT-146
VEH SPD SEN/CIR AT* ENGINE SPEED SIG P0725 0725 — — × AT-115 TCC SOLENOID/CIRC P0740 0740 — — × AT-117 A/T TCC S/V FNCTN P0744 0744 — — × AT-122 L/PRESS SOL/CIRC P0745 0745 — — × AT-127 ECM BACK UP/CIRC P1065 1065 — — × EC-404 INT/V TIM V /CIR-B1 P1111 1111 — — × EC-408 ETC ACTR P1121 1121 — — — EC-415 ETC FUNCTION/CIRC P1122 1122 — — — EC-417 ETC MOT PWR P1124 1124 — — — EC-423 ETC MOT PWR P1126 1126 — — — EC-423 ETC MOT P1128 1128 — — — EC-428 INT/V TIM V/CIR-B2 P1136 1136 — — × EC-408
HO2S1 (B1) P1143 1143 ×× HO2S1 (B1) P1144 1144 ×× HO2S2 (B1) P1146 1146 ×× HO2S2 (B1) P1147 1147 ××
CLOSED LOOP-B1 P1148 1148 — — — EC-470
HO2S1 (B2) P1163 1163 ×× HO2S1 (B2) P1164 1164 ×× HO2S2 (B2) P1166 1166 ×× HO2S2 (B2) P1167 1167 ××
CLOSED LOOP-B2 P1168 1168 — — — EC-470 TCS C/U FUNCTN P1211 1211 — — × EC-472 TCS/CIRC P1212 1212 — — × EC-473 ENG OVER TEMP P1217 1217 — — — EC-474 CTP LEARNING P1225 1225 — — × EC-486 CTP LEARNING P1226 1226 — — × EC-488 SENSOR POWER/CIRC P1229 1229 — — — EC-490 PURG VOLUME CONT/V P1444 1444 — — × EC-495 VENT CONTROL VALVE P1446 1446 — — × EC-503 ASCD SW P1564 15 64 — — — EC-510 ASCD BRAKE SW P1572 1572 — — — EC-517 ASCD VHL SPD SEN P1574 15 74 — — — EC-533
NATS MALFUNCTION TPV SEN/CIRC A/T P1 705 1705 — — — AT-144
7
CONSULT-II
GST*
P0720 0720 — — × AT-110
P1610 -
P1615
Tes t value /
Test limit
(GST only)
1st trip DTC
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
5
×*
Reference
page
EC-433 EC-439 EC-446 EC-458
EC-433 EC-439 EC-446 EC-458
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EC-53
ON BOARD DIAGNOSTIC (OBD) SYSTEM
1
2
DTC*
ECM*
3
SRT code
Items
(CONSULT-II screen terms)
P-N POS SW/CIRCUIT P1706 1706 — — × EC-535 TURBINE REV S/CIRC P1716 1716 — — × AT-152 A/T INTERLOCK P1730 1730 — — — AT-159 I/C SOLENOID/CIRC P1752 1752 — — — AT-170 I/C SOLENOID FNCTN P1754 1754 — — — AT-175 FR/B SOLENOID/CIRC P1757 1757 — — — AT-179 FR/B SOLENOID/CIRC P1759 1759 — — — AT-184 D/C SOLENOID/CIRC P176 2 1762 — — — AT-189 D/C SOLENOID FNCTN P1764 1764 — — — AT-194 HLR/C SOL/CIRC P176 7 1767 — — — AT-198 HLR/C SOL FNCTN P1769 1769 — — — AT-203 LC/B SOLENOID/CIRC P1772 1772 — — — AT-208 LC/B SOLENOID FNCT P1774 1774 — — — AT-213 BRAKE SW/CIRCUIT P1805 1805 — — × EC-544 APP SEN 1/CIRC P2122 2122 — — — EC-550 APP SEN 1/CIRC P2123 2123 — — — EC-550 APP SEN 2/CIRC P2127 2127 — — — EC-557 APP SEN 2/CIRC P2128 2128 — — — EC-557 TP SENSOR P2135 2135 — — — EC-564 APP SENSOR P2138 2138 — — — EC-571
*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: SRT code will not be set if the self-diagnostic result is NG.
*5: This is not displayed with GST. *6: The troubleshooting for this DTC needs CONSULT-II. *7: When the fail-safe operations for both self -diagnoses occur at the same time, the MIL illumina te s.
CONSULT-II
GST*
Test val ue/
Test limit
(GST only)
1st trip DTC
Reference
page
DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic result obtained. If t he ECM memory w as cleared previously, and the 1st trip DTC did no t reoccur, the 1st trip DTC will not be displayed. If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not light up (two trip detect ion logic ). If the sam e malfun ction is not detect ed in the 2nd tri p (meet ing the req uired driving pattern), th e 1st trip DTC i s clear ed from th e ECM m emory. If the same malfunc tion is de tected i n the 2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words, the DTC is stor e d in t h e ECM m emo ry an d the MI L lig ht s u p whe n t he sa me m al f unct io n occu r s in t wo co ns ec­utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory. Procedures for clearin g the D TC and th e 1st t rip DTC from th e ECM memory are descri bed in EC-64, "
TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .
For malfunctions in which 1st trip DTCs are displayed, refer to EC-51, "
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS" . These items are required by legal regulations to continuously monitor the system/
component. In addition, the items monitored non-continuously are also displayed on CONSULT-II. 1st trip DTC is specified in Mode 7 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the vehi­cle from being tested, for example during Inspection/Maintenance (I/M) tests. When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame data as specified in Work F low p r oc ed ure Step II, refer to EC-76, "
Revision; 2004 April 2003 G35 Coupe
EC-54
WORK FLOW" . Then perform DTC Confir-
HOW
ON BOARD DIAGNOSTIC (OBD) SYSTEM
mation Procedure or Overall Function Check to try to duplicate the malfunction. If the malfunction is dupli­cated, the item requires repair.
How to Read DTC and 1st Trip DTC
DTC and 1st trip DTC can be read by the following methods.
With CONSULT-II
With GST CONSUL T-II or GST (Generic Scan Tool) Examples: P0340, P1148, P1706, etc. These DTCs are prescribed by SAE J2012. (CONSULT-II also displays the malfunctioning component or system.)
No Tools The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC. Example: 0340, 1148, 1706, etc. These DTCs are controlled by NISSAN.
● 1st trip DTC No. is the same as DTC No.
● Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi-
cate whether the malfunction is still occurring or has occurred in the past and has returned to nor­mal. CONSULT-II can iden tify mal function status as shown bel ow. Therefore, using CONSULT-II (if available) is recommended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc­tion is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. T ime data indicates how man y times the vehicle was driven after the last detection of a DTC. If the DTC is being detected currently, the time data will be [0]. If a 1st trip DTC is stored in the ECM, the time data will be [1t].
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PBIB0911E
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem­perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, base fuel schedule and intake air temperature at the moment a malfunction is detected. Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data. The data, stored toge ther with the DTC da ta, are called freeze fr ame data and displaye d on CONSULT- II or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For details, see EC -111 , " Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority for 1st trip freeze f rame data and it is upda ted each time a differe nt 1st trip DTC is det ected. Howev er, once freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no longer stored. R eme mber, only one set of free ze fra me da ta can be stored in the ECM . The ECM has th e fol­lowing pri orities to up date the data.
Priority Items
1
2 Except the above items (Includes A/T related items) 3 1st trip freeze frame data
Freeze frame data Misfire — DTC: P0300 - P0306
Freeze Frame Data and 1st Trip Freeze Frame Data" .
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
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For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
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EC-55
ON BOARD DIAGNOSTIC (OBD) SYSTEM
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st trip freeze f rame d at a ca n be s tor ed in th e EC M). I f f r eeze f rame d ata is store d i n the E CM mem ory an d f ree ze frame data with the sa me prio rity oc curs la ter, the first (origina l) free ze fr ame da ta remains u nchang ed in t he ECM memory. Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem­ory is erased . Procedures for clea ring the ECM memory are described in EC-64, "
SION-RELATED DIAGNOSTIC INFORMATION" .
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Mode 1 of SAE J1979. As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com­ponents. Completion must be verified in order for the emissions inspection to proceed. If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use the information in this Service Manual to set the SRT to “CMPLT”. In most case s the EC M w il l a ut om atically complete its self-diagn os is c ycle during normal usage, and t he SRT status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains “CMPLT” until the self-diagnosis memory is erased. Occasionally, certain portions of the se lf-diagnostic test may not be completed as a res ult of the customer' s normal drivin g pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT wil l also indicate “INCMP” if the self-diagnosis memory is erased for any reason o r if the ECM mem­ory power supply is interrupted for several hours. If, during the state e missions insp ection, th e SRT indicates “CMPLT” for all test items, t he inspecto r will con­tinue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the vehicle is returned to the cust omer untested.
NOTE:
If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and DTC (No DTCs) before the inspection.
HOW TO ERASE EMIS-
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EC-56
ON BOARD DIAGNOSTIC (OBD) SYSTEM
SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
SRT item
(CONSULT-II indica-
tion) CATALYST 2 Three way catalyst function P0420, P0430 EVAP SYSTEM 1 EVAP control system P0442
HO2S 2 Heated oxygen sensor 1 P0132, P0152
HO2S HTR 2 Heated oxygen sensor 1 heat er P0031, P0032, P0051,
*1: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority for models with CONSULT-II.
Perfor-
mance Pri-
ority*1
2 EVAP control system P0456 2 EVAP control system purge flow monitoring P0441
Required self-diagnostic items to set the SRT to “CMPLT”
Heated oxygen sensor 1 P0133, P0153 Heated oxygen sensor 1 P0134, P0154 Heated oxygen sensor 1 P1143, P1163 Heated oxygen sensor 1 P1144, P1164 Heated oxygen sensor 2 P0138, P0158 Heated oxygen sensor 2 P0139, P0159 Heated oxygen sensor 2 P1146, P1166 Heated oxygen sensor 2 P1147, P1167
Heated oxygen sensor 2 heater P0037, P0038, P0057,
Corresponding DTC
No.
P0052
P0058
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F
G
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SRT Set Timing
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is done regardle ss of whether the result is OK or NG. The set timing is different between OK and NG results and is shown in the table below.
Self-diagnosis result
All OK Case 1 P0400 OK (1) — (1) OK (2) — (2)
SRT of EGR “CMPLT” “CMPLT” “CMPLT” “CMPLT”
Case 2 P0400 O K (1 ) — (1) — (1) — (1)
SRT of EGR “INCMP” “INCMP” “CMPLT” “CMPLT”
NG exists Case 3 P0400 OK OK — —
SRT of EGR “INCMP” “INCMP” “INCMP” “CMPLT”
OK: Self-diagnosis is carried out and the result is OK. NG: Self-diagnosis is carried out and the result is NG.
Diagnosis
P0402 OK (1) — (1) — (1) OK (2) P1402 OK (1) OK (2) — (2) — (2)
P0402 — (0) — (0) OK (1) — (1) P1402 OK (1) OK (2) — (2) — (2)
P0402 — — — —
P1402 NG — NG
(1st trip)
DTC
← ON → OFF ← ON → OFF ← ON → OFF ← ON →
1st trip DTC — 1st trip DTC
Example
Ignition cycle
NG
(Consecutive
NG)
DTC
(= MIL “ON”)
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Revision; 2004 April 2003 G35 Coupe
EC-57
ON BOARD DIAGNOSTIC (OBD) SYSTEM
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate “CMPLT”. → Case 1 above When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate “CMPLT” at the time the respective self-diagnoses have at least one OK result. → Case 2 above If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indi­cate “CMPLT”. → Case 3 above The table above s hows that the mi nimum number of cycles for setting SRT as “INCMP” is one (1) f or each self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice (Case 3) for the following reasons:
● The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
● The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis r esults.
● When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to “CMPLT” of SRT, the self-diagno-
sis memory must be erased from ECM after repair.
● If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out prior to the state emission inspection even though the SRT indicates “CMPLT”.
SRT Service Procedure
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review the flowchart diagnostic sequence on the next page.
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EC-58
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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EC
C
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*1 EC-55 *2 EC-59 *3 EC-60
How to Display SRT Code
WITH CONSULT-II Selecting “SRT STATUS” in “DTC CONFIRMATION” mode with CONSULT-II. For items whose SRT codes are set, a “CMPLT” is displayed on the CONSULT-II screen; for items whose SRT codes are not set, “INCMP” is displayed. A sample of CONSULT-II display for SRT code is shown at right. “INCMP” means the se lf-d ia gnosis is incompl ete a nd SRT is no t s et. “CMPLT” means the self-diagnosis is complete and SRT is set.
WITH GST Selecting Mode 1 with GST (Generic Scan Tool)
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SEF573XA
SEF935Z
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EC-59
ON BOARD DIAGNOSTIC (OBD) SYSTEM
How to Set SRT Code
To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each diagnosis may require a long peri od of actual driving under various conditions.
WITH CONSUL T-II Perform corresponding DTC Confirmation Procedure one by one based on Performance Priority in the table on EC-57, "
WITHOUT CONSUL T-II The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The driving pattern should be performed one or more times to s et all SRT codes.
SRT Item" .
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EC-60
Driving Pattern
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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PBIB1053E
Revision; 2004 April 2003 G35 Coupe
EC-61
ON BOARD DIAGNOSTIC (OBD) SYSTEM
● The time requi red for e ach diag no si s va rie s wit h ro ad surf ac e cond i tio ns, wea the r, altitude, individua l dri v-
ing habits , etc. Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the shortest. Zone B refers to the range whe re the diagnosis can s till be performed if the diag nosis is not complet ed within zone A.
*: Normal conditions refer to the following:
● Sea level
● Flat road
● Ambient air temperature: 20 - 30°C (68 - 86°F)
● Diagnosis is pe rformed as quickly as possible und er normal conditi ons.
Under different condition s [For exam ple: amb ient air temp erature oth er than 20 - 30°C (68 - 86°F)], diag ­nosis may also be per fo r m ed .
Pattern 1:
● The engine is started at the engine coolant temperature of −10 to 35°C (14 to 95°F)
(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).
● The engine must be ope rated at idle speed until the engin e coolant temperature is greater than
70°C (158°F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).
● The engine is started at the fuel tank temperature of warmer than 0°C (32°F) (where the voltage
between the ECM terminal 107 and ground is less than 4.1V).
Pattern 2:
● When steady-state driving is performed again even after it is int errupted, each diagnosis can be con-
ducted. In this case, the time required for diagnosis may be extended.
Pattern 3:
● The driving pattern outlined in *2 must be repeated at least 3 times.
Pattern 4:
● Tests are performed after the engine has been operated for at least 17 minutes.
● The accelerator pedal must be held very steady during steady-state driving.
● If the accelerator pedal is moved, the test must be conducted all over again.
*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h
(56 MPH) again. *2: Operate the vehicle in the following driving pattern.
1. Decelerate vehicle to 0 km/h (0 MPH) and let engine idle.
2. Repeat dr iving pattern shown at right at least 10 times.
– During acceleration, hold the accelerator pedal as steady as
possible.
*3: Checking the vehicle speed with GST is advised.
SEF414S
Suggested Transmission Gear Position
Set the selector lever in the D position.
Suggested Upshift Speeds for M/T Models
Shown below are suggested vehi cle speeds for s hifting into a hi gher gear. These suggestions re late to fuel economy and vehicle performance. Actual upshift speeds will vary according to road conditions, the weather and individual driving habits.
Revision; 2004 April 2003 G35 Coupe
EC-62
ON BOARD DIAGNOSTIC (OBD) SYSTEM
For normal acceleration in low altitude areas
[less than 1,219 m (4,000 ft)]:
Gear change ACCEL shift point km/h (MPH) CRUISE shift point km/h (MPH) km/h (MPH) 1st to 2nd 21 (13) 13 (8) 24 (15) 2nd to 3rd 37 (23) 26 (16) 40 (25) 3rd to 4th 48 (30) 40 (25) 64 (40) 4th to 5th 60 (37) 45 (28) 72 (45) 6th 68 (42) 53 (33) 80 (50 )
For quick acceleration in low altitude
areas and high altitude areas
[over 1,219 m (4,000 ft)]:
Suggested Ma ximum Speed in Each Gear
Downshift to a lower gear if the engine is not running smoothly, or if you need to accelerate. Do not exceed t h e ma ximum s ug ge sted s pe ed ( s hown be lo w) i n an y gear. For level road d r ivin g, u se t h e high ­est gear suggested for that speed. Always observe po sted speed limits and drive acc o rdin g to the roa d co nd i­tions to ensure sag e operation. Do not over-rev the engine when shifting to a lower gear as it may caus e engine damage or loss of vehicle control.
Gear km/h (MPH) 1st 56 (35) 2nd 96 (60) 3rd 136 (85) 4th — 5th — 6th —
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TEST VA LUE AND TEST LIMIT (GST ONLY — NOT APPLICABLE TO CONSULT-II)
The following is the information specified in Mode 6 of SA E J1979. The test valu e is a parameter us ed to determine w hether a syste m/circuit diagnos tic test is OK o r NG while being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored. Items for which these data (test value and test limit) are displayed are the same as SRT code items (30 test items).
These data (test value an d test limit) are s pecified b y Test ID (TID) and Comp onent ID (C ID) and ca n be dis­played on the GST screen.
×: Applicable —: Not applicable
SRT item Self-diagn ost ic test item
Three way catalyst function (Bank 1)
CATALYST
Three way catalyst function (Bank 2)
EVAP control system (Small leak) 05H 03H Max. ×
EVAP SYSTEM
EVAP control system purge flow monitoring 06H 83H Min. ×
EVAP control system (Very small leak) 07H 03H Max. ×
Test value (GST display)
TID CID 01H 01H Max. × 02H 81H Min. × 03H 02H Max. × 04H 82H Min. ×
Test limit Application
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Revision; 2004 April 2003 G35 Coupe
EC-63
ON BOARD DIAGNOSTIC (OBD) SYSTEM
SRT item Self-diagnostic test item
HO2S
Heated oxygen sensor 1 heater (Bank 1)
Heated oxygen sensor 1 heater (Bank 2)
HO2S HTR
Heated oxygen sensor 2 heater (Bank 1)
Heated oxygen sensor 2 heater (Bank 2)
Heated oxygen sensor 1 (Bank 1)
Heated oxygen sensor 1 (Bank 2)
Heated oxygen sensor 2 (Bank 1)
Heated oxygen sensor 2 (Bank 2)
Test value (GST display)
TID CID 09H 04H Max. ×
0AH 84H Min. ×
0BH 04H Max. × 0CH 04H Max. × 0DH 04H Max. ×
11H 05H Max. × 12H 85H Min. × 13H 05H Max. × 14H 05H Max. × 15H 05H Max. × 19H 86H Min. × 1AH 86H Min. × 1BH 06H Max. ×
1CH 06H Max. ×
21H 87H Min. × 22H 87H Min. × 23H 07H Max. × 24H 07H Max. × 29H 08H Max. × 2AH 88H Min. × 2BH 09H Max. ×
2CH 89H Min. × 2DH 0AH Max. ×
2EH 8AH Min. × 2FH 0BH Max. × 30H 8BH Min. ×
Test limit Application
HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION How to Erase DTC
WITH CONSULT-II
The emission rela ted diagnostic inform ation in the ECM can be era sed by selecting “ERASE” in the “SELF­DIAG RESUL TS” mode with CONSULT-II. If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individu­ally from the ECM and TCM (Transmission control module).
NOTE: If the DTC is not for A/T related items (see EC-8
1. If the ignition s w itc h stays ON aft er re pair work , b e sure to turn ign iti on s witc h O FF on ce. Wait at least 10 seconds and then turn it ON (engine stopped) again.
2. Turn CONSULT-II ON and touch “A/T”.
3. Touch “SELF-DIAG RESULTS”.
4. Touch “ERASE”. [The DTC in the TCM (Transmission control module) will be erased.] Then touch “BACK” twice.
5. Touch “ENGINE” .
6. Touch “SELF-DIAG RESULTS”.
Revision; 2004 April 2003 G35 Coupe
), skip steps 2 through 4.
EC-64
ON BOARD DIAGNOSTIC (OBD) SYSTEM
7. Touch “ERASE”. (The DTC in the ECM will be erased.)
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SCIA5671E
WITH GST
The emission related diagnostic informati on in the ECM can be erased by selecting Mode 4 with GST.
NOTE: If the DTC is not for A/T related items (see EC-8
), skip step 2.
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.
2. Perform AT-96, "
TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)" . (The engine w a rm-u p step can
be skipped when performing the diagnosis only to erase the DTC.)
3. Select Mode 4 with GST (Generic Scan Tool).
NO TOOLS
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
2. Wait at least 10 seconds and then turn it ON (engine stopped) again.
3. Change the di agnostic test mod e from Mode II to Mode I by depressing the acce lerator pedal. Refe r to
EC-68, "
● If the battery is disconnected, the emissio n-related diagnostic information wil l be lost within 24
HOW TO SWITCH DIAGNOSTIC TEST MODE" .
hours.
● The following data are cleared when the ECM memory is erased.
– Diagnostic trouble codes – 1st trip diagnostic trouble codes – Freeze frame data – 1st trip freeze frame data – System readi ness test (SRT) codes
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Revision; 2004 April 2003 G35 Coupe
EC-65
ON BOARD DIAGNOSTIC (OBD) SYSTEM
– Test values – Others
Actual work p r oced ur es are e xpl a in ed us in g a DT C as an ex am pl e. Be car e ful so t hat n ot o nly th e D TC , bu t al l of the data listed above, are cleared from the ECM memory during work procedures.

IVIS (Infiniti Vehicle Immobilizer System — NATS) ABS0037N

● If the security indicator lights up with the ignition switch in
the ON position or “NATS MALFUNCTION” is displayed on “SELF-DIAG RESULTS” screen, perform self-diagnostic results mode with CONSULT-II using NATS program card. Refer to BL-122, "
SYSTEM-NATS)" .
● Confirm no self-diagnostic results of IVIS (NATS) is dis-
played before touching “ERASE” in “SELF-DIAG RESULTS” mode with CONSULT-II.
● When replacing ECM, initialization of IVIS (NATS) system
and registration of all IVIS (NATS) ignition key IDs must be carried out with CONSULT-II using NATS program card. Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of IVIS (NATS) initialization and IVIS ( NATS) ign ition key ID registration, refer to CONSULT-II o peration manual, IVIS/NVIS.
IVIS (INFINITI VEHICLE IMMOBILIZER
SEF543X

Malfunction Indicator Lamp (MIL) ABS0037O

DESCRIPTION
The MIL is located on the instrument panel.
1. The MIL will light up when th e ignitio n switch is turned ON with­out the engine running. This is a bulb check. If the MIL does not light up, refer to DI-32, " or see EC-628
.
2. When the engine is st arted, the MIL s h ould go off. If the MIL remains on, the on board diagnostic system has detected an engine system malfunction.
WARNING LAMPS" ,
SEF217U
Revision; 2004 April 2003 G35 Coupe
EC-66
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following four functions.
Diagnostic Test Mode
Mode I Ignition switch in
KEY and ENG. Status
ON position
Engine stopped
Function Explanation of Function
BULB CHECK This function checks the MIL bulb for da mage (blown,
open circuit, etc.). If the MIL does not come on, check MIL circuit.
A
EC
C
D
Engine running MALFUNCTION
Mode II Ignition switch in
ON position
Engine stopped
Engine running HEATED OXYGEN SENSOR 1
WARNING
SELF-DIAGNOSTIC RESULTS
MONITOR
This is a usual driving condition. When a malfunction is detected twice in two consecutive driv ing cycl es (two trip detection logic), the MIL will light up to inform the drive r that a malfunction has been detected. The following malfunctions will light up or blink the MIL in the 1st trip.
● M is fir e (Pos sib le three w ay catalyst dam age)
● O ne t rip detect i on di agnoses
This function allows DTCs and 1st trip DTCs to be read.
This function allows the fuel mixture condition (lean or rich), monitored by heated oxygen sensor 1, to be read.
When there is an op en c irc ui t o n M IL c irc ui t, t he EC M c an not wa rn the driver by ligh tin g M IL u p w h en th ere is malfunction on engine control system. Therefore, when electrical controlled throttl e an d part o f ECM related diagnoses ar e co nt inu ously detected a s NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the driver to repair the malfunction.
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
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MIL Flashing Without DTC
If the ECM is in Diagnostic Test Mode II, MIL may flash when engine is running. In this case, check ECM diag­nostic test mode. EC-68, " How to switch the diagnostic test (function) modes, and details of the above functions are described later. EC-
68, "HOW TO SWITCH DIAGNOSTIC TEST MODE" .
The following emission-related diagnostic information is cleared when the ECM memory is erased .
● Diagnostic trouble codes
● 1st trip diagnostic trouble codes
● Freeze frame data
● 1st trip freeze frame data
● System readine ss test (SRT) codes
● Te st va lu es
● Others
Revision; 2004 April 2003 G35 Coupe
HOW TO SWITCH DIAGNOSTIC TEST MODE" .
EC-67
ON BOARD DIAGNOSTIC (OBD) SYSTEM
HOW TO SWITCH DIAGNOSTIC TEST MODE
NOTE:
● It is better to count the time accurately with a clock.
● It is impossible to switch the dia gnostic mode when an acce lerator pedal position sensor ci rcuit
has a malfunction.
● Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
How to Set Diagnostic Test Mode II (Self-diagnostic Results)
1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 second s.
a. Fully depress the accelerator pedal. b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts blinking.
4. Fully release the accelerator pedal. ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
PBIB0092E
How to Set Diagnostic Test Mode II (Heated Oxygen Sensor 1 Monitor)
1. Set the ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to EC-68, "How to Set Diagnostic
Test Mode II (Self-diagnostic Results)" .
2. Start Engine.
ECM has entered to Diagnostic Test Mode II (Heated oxygen sensor 1 monitor). ECM will start heated oxygen sensor 1 monitoring from the bank 1 sensor.
How to Switch Monitored Sen sor Fr om Bank 1 to Bank 2 or Vice Versa
1. Fully depress the accelerator pedal quickly and then r elease it immediately.
2. Make sure that monitoring sensor has changed by MIL blinking as follows.
PBIB0093E
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
1. Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to EC-68, "How to Set Diagnostic Test
Mode II (Self-diagnostic Results)" .
2. Fully depress the accelerator pedal and keep it for more than 10 seconds. The emission-related diagnostic infor mation has been erased from the backup memory in t he ECM.
3. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.
Revision; 2004 April 2003 G35 Coupe
EC-68
ON BOARD DIAGNOSTIC (OBD) SYSTEM
DIAGNOSTIC TEST MODE I — BULB CHECK
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to DI-
32, "W ARNING LAMPS" or see EC-628 .
A
DIAGNOSTIC TEST MODE I — MALFUNCTION WARNING
MIL Condition ON Wh en the malfunction is det ected.
OFF No malfunction.
This DTC number is clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)
DIAGNOSTIC TEST MODE II — SELF-DIAGNOSTIC RESULTS
In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below. The DTC and 1s t trip DTC are displaye d at the same time. If the MIL does not illu minate in diagnost ic test mode I (Malfu nctio n wa rning ), al l dis play ed it ems a re 1st trip D TCs. If onl y one code is di spla yed wh en th e MIL illuminates in diagnostic te st mode II (SE LF-DIAGNOSTIC RESULTS), it is a DTC; if two o r more codes are displayed, they may be ei the r DTCs or 1s t tri p DTCs . DTC No . is sa me as tha t of 1s t trip DTC. Th es e unide n­tified codes can b e iden tifie d by us ing th e CON SULT-II or GST. A DTC will be used as an ex ampl e for ho w to read a code.
EC
C
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A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated by the number of ten flashes. Th e length of tim e the 1,000th -digit nume ral flashes on a nd off is 1.2 seco nds consisting of an ON (0.6-second) - OFF (0.6-second) cycle. The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle. A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later numeral appears on the display 1.3 seconds after the former numeral has disappeared. A change from one troubl e cod e to an oth er oc cu rs at an inte rva l of 1.8 -se c on d OF F. In this way, all the de te cte d m al f un ct ions a r e c la ss ifi ed by t he i r D TC nu mb ers . Th e DTC 00 00 ref e r s to no m al ­function. (See EC-8, "
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to EC-
68, "How to Erase Diagnostic Test Mode II (Self-diagnostic Results)" .
● If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours.
● Be careful not to erase the sto red memory before starting trouble diagnoses.
DIAGNOSTIC TEST MODE II — HEATED OXYGEN SENSOR 1 MONITOR
In this mode, the MIL displays the condition of the fuel mixture (lean or rich) which is monitored by the heated oxygen sensor 1.
INDEX FOR DTC" )
SEF952W
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Revision; 2004 April 2003 G35 Coupe
EC-69
ON BOARD DIAGNOSTIC (OBD) SYSTEM
MIL Fuel mixture condition in the exhau st ga s Air fuel ratio feedback control condition ON Lean
OFF Rich
*Remains ON or OFF Any condition Open lo op syst em
*: Maintains conditions just before switching t o open l oop.
Closed loop system
To check the heated ox ygen sensor 1 function, start engine in t he Diagnostic Test Mode II and warm it u p until engine coolant temperature indicator points to the m iddle of the gauge. Next run engine at a bout 2,000 rpm for ab out 2 minutes u nder no-load conditio ns. Then make sure that the MIL comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.

OBD System Operation Chart ABS0037P

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
● When a malfunctio n is detected for the first time, t he 1st trip DTC and th e 1st trip freeze fra me data are
stored in the ECM memory.
● When the same malfun ction is det ected in two con secutive trips, the DTC and th e freeze frame data are
stored in the ECM mem ory, and th e MIL will come on. For details, ref er to EC-50, "
Logic" .
● The MIL will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when
the recorded driv ing pattern is met (as stored in the ECM). If another malfunction occurs while coun ting, the counter will reset.
● The DTC and the freeze frame data will be sto red until the vehicl e is driven 40 times (dr iving pattern A)
without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injection System, the DTC and freeze frame data will be stored unti l the vehicle is driven 80 ti mes (driving pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CONSULT-II will count the number of times the ve hicle is driven.
● The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.
Two Trip Detection
SUMMARY CHART
Items Fuel Injection System Misfire Other MIL (goes off) 3 (pattern B) 3 (pattern B) 3 (pattern B) DTC, Freeze Frame Data (no
display) 1st Trip DTC (clear) 1 (pattern C), *1 1 (pattern C), *1 1 (pattern B) 1st Trip Freeze Frame Data
(clear)
For details about patterns B and C under “Fuel Injection System” and “Misfire”, see EC-72 . For details about patterns A and B under “Other”, see EC-74 *1: Clear timing is at the moment OK is detected. *2: Clear timing is when the same malfunct ion is dete cte d in the 2nd trip.
80 (pattern C) 80 (pattern C) 40 (pattern A)
*1, *2 *1, *2 1 (pattern B)
.
Revision; 2004 April 2003 G35 Coupe
EC-70
ON BOARD DIAGNOSTIC (OBD) SYSTEM
RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING P ATTERNS FOR “MISFIRE ” <EXHAUST QUALITY DETERIORAT ION>, “FUE L INJECTION SYSTEM”
A
EC
C
D
E
F
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*1: Wh en th e sam e ma lfunc tion i s
detected in two consecutive trips, MIL will light up.
*4: The DTC and t he freeze frame data
will not be displayed any longer after vehicle is driven 80 times (pattern C) without the same malfunction. (The DTC and the freeze frame data still remain in EC M.)
*7: Wh en th e sam e ma lfunc tion i s
detected in the 2nd trip, the 1st trip freeze frame data will be cleared.
*2: MIL will go off after vehicle is drive n
3 times (pattern B) without any mal­functions.
*5: When a mal fu nct ion is de tec te d for
the first time, the 1st trip DTC and the 1st trip freeze frame data will be stored in ECM.
*8: 1st trip DTC will be cleared when
vehicle is driven once (pattern C) without the same malfunction after DTC is stored in ECM.
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SEF392S
*3: Wh en th e sam e ma lfunc tion i s
detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*6: The 1st trip DTC and the 1st trip
freeze frame data will be clear e d at the moment OK is detected.
Revision; 2004 April 2003 G35 Coupe
EC-71
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORA­TION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern B>
Driving pattern B means the vehicle operation as follows: All components and systems should be monitored at least once by the OBD system.
● The B counter will be cleared when the malfunction is det ected once regardless of the driving pattern.
● The B counter will be counted up when driving pattern B is satisfied without any malfunction.
● The MIL will go off when the B counter reaches 3. (*2 in OBD SYSTEM OPERATION CHART)
<Driving Pattern C>
Driving pattern C means the vehicle operation as follows: The following conditions should be satisfied at the same time: Engine speed: (Engine speed in the freeze frame data) ±375 rpm Calculated load value: (Calculated load value in the freeze frame data) x (1±0.1) [%] Engine coolant temperatur e (T) condition:
● When the freeze frame data shows lower than 70°C (158°F), T should be lower than 70°C (158°F).
● When the freeze frame da ta sh ows hig her tha n or equa l to 70 °C (158°F), T sh ould be hig her than or eq ual
to 70°C (158°F).
Example: If the stored freeze frame data is as follows: Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temper ature: 80°C (176°F) To be satisfied with driving pattern C, the vehicle should run under the following conditions: Engine speed: 475 - 1,22 5 rpm, Calcu lat ed lo ad va lue: 2 7 - 33 %, Eng ine cool ant te mper atur e: mo re tha n 70 °C (158°F)
● The C counter will be cleared when the malfunction is detected regardless of vehicle conditions above.
● The C counter wil l be c ounted up when vehi cle con ditio ns ab ove i s satis fie d witho ut the same ma lfun ction .
● The DTC will not be displayed after C counter reaches 80.
● The 1st trip DTC will be cleared when C counter is counted once wi th ou t the sa m e m alf un ction after DTC
is stored in ECM.
Revision; 2004 April 2003 G35 Coupe
EC-72
ON BOARD DIAGNOSTIC (OBD) SYSTEM
RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”
A
EC
C
D
E
F
G
*1: Wh en th e sam e ma lfunc tion i s
detected in two consecutive trips, MIL will light up.
*4: The DTC and t he freeze frame data
will not be displayed any longer after vehicle is driven 40 times (pattern A) without the same malfunction. (The DTC and the freeze frame data still remain in ECM.)
*7: Wh en th e sam e ma lfunc tion i s
detected in the 2nd trip, the 1st trip freeze frame data will be cleared.
*2: MIL will go off after vehicle is drive n
3 times (pattern B) without any mal­functions.
*5: When a mal fu nct ion is de tec te d for
the first time, the 1st trip DTC and the 1st trip freeze frame data will be stored in ECM.
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SEF393S
*3: Wh en th e sam e ma lfunc tion i s
detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*6: 1st trip DTC will be cleared after
vehicle is driven once (pattern B) without the same malfunction.
Revision; 2004 April 2003 G35 Coupe
EC-73
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern A>
● The A counter will be cleared when the malfunction is detected regardless of (1) - (4).
● The A counter will be counted up when (1) - (4) are satisfied without the same malfunction.
● The DTC will not be displayed after the A counter reaches 40.
<Driving Pattern B>
Driving pattern B means the vehicle operation as follows: All components and systems should be monitored at least once by the OBD system.
● The B counter will be cleared when the malfunction is det ected once regardless of the driving pattern.
● The B counter will be counted up when driving pattern B is satisfied without any malfunctions.
● The MIL will go off when the B counter reaches 3 (*2 in OBD SYSTEM OPERATION CHART).
AEC574
Revision; 2004 April 2003 G35 Coupe
EC-74

TROUBLE DIAGNOSIS

TROUBLE DIAGNOSIS PFP:00004

Trouble Diagnosis Introduction ABS0037Q

INTRODUCTION
The engine has an EC M to control majo r systems suc h as fuel con­trol, ignition control, i dle air control system, etc. The ECM accepts input signals from sensors and instantly drives actuato rs. It is essen­tial that both input and output s ignals are proper and stable. At the same time, it is important that there are no malfunctions such as vac­uum leaks, fouled spark plugs, or other malfunctions with the engine.
A
EC
C
D
It is much more difficult to d iagnose a incident that occ urs intermit­tently rather than continuously. Most intermittent incidents are caused by poor electric connections or improper wiring. In this case, careful checking of sus pect ed circui ts may he lp prev ent th e repla ce­ment of good p arts.
A visual check only may not find the cause of the incidents. A road test with CONSU LT-II (or GST) or a ci rcuit tester connected should be performe d. Follow the Work Flow on EC-76
. Before undertaking actual checks, take a few minutes to talk with a customer who approaches with a driveability complaint. The cus­tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under what condition s they o ccur. A Diagnostic Wo rkshe et lik e the exam ple on EC-78
should be used. Start your diagnosis by looking for conventional malfunctions first. This will help t roubleshoot drive ability malfunct ions on an electro ni­cally controlled engine vehi cle.
MEF036D
SEF233G
SEF234G
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Revision; 2004 April 2003 G35 Coupe
EC-75
M
WORK FLOW Flow Chart
TROUBLE DIAGNOSIS
*1 If time data of “SELF-DIAG
RESULTS” is other than [0] or [1t], perform EC-132, "TROUBLE DIAG-
NOSIS FOR INTERMITTENT INCI­DENT" .
*4 If malfunctioning part cannot be
detected, perform EC-132, "
BLE DIAGNOSIS FOR INTERMIT­TENT INCIDENT" .
TROU-
*2 If the inc ide nt cannot be verified, per-
form EC-132, "
SIS FOR INTERMITTENT INCIDENT" .
*5 EC-61
TROUBLE DIAGNO-
PBIB1043E
*3 If the on board diagnostic system
cannot be performed, check main power supply and ground circuit. Refer to EC-133, "POWER SUPPLY
CIRCUIT FOR ECM" .
*6 EC-128
Revision; 2004 April 2003 G35 Coupe
EC-76
Description for Work Flow
STEP DESCRIPTION
STEP I
STEP II
STEP III
STEP IV
STEP V
STEP VI
STEP VII
Get detailed information about the conditions and the envir onm ent when the incident/symptom occurred usi ng the
EC-77, "
Before confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st trip) DTC and the (1st trip) freeze frame data, then erase the DTC and the data. (Refer to EC-64 freeze frame data can be used when duplicating the incident at STEP III & IV. If the incident cannot be verified, perform EC-132, " Study the relationship between the cause, specified by (1st trip) DTC, and th e sym pt om descr ib ed by t he customer. (The Symptom Matrix Chart will be useful. See EC-86 .) Also check related service bulleti ns for information.
Try to confirm the symptom and under what conditions the inciden t occ urs . The DIAGNOSTIC WORK SHEET and the freeze frame data are useful to verify the incident. Connect CONSULT-II to the vehicle in DATA MONI TOR (AUTO TRIG) mo de and check real time diagnosis results. If the incident cannot be verified, perform EC-132, " If the malfunction code is detected, skip STEP IV and perform STEP V.
Try to detect the (1st trip) DTC by driving in (or performing) the DTC Confirmation Procedure. Check and read the (1st trip) DTC and (1st trip) freeze frame data by using CONSULT-II or GST. During the (1st trip) DTC verification, be sure to connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results. If the incident cannot be verified, perform EC-132, " In case the DTC Confirmation Procedure is not avail abl e, perfor m the O ver al l Function C he ck in st ead. The (1s t trip) DTC cannot be displayed by this check, howe ver, this simplified check is an effective alternative. The NG result of the Overall Function Check is the sam e as the (1st trip ) DT C dete ct io n.
Take the appro priat e act ion based on the results of STEP I through IV. If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX. If the normal code is indicated, proceed to the BASIC INSPECTION. (Refer to EC-81 according to the Symptom Matrix Chart. (Refer to EC-86
Identify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the system for mechanical binding, loose connectors or wiring damage using (tracing) Harness Layouts. Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR (AUTO TRIG)” mode. Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT -II. Refer to EC-98 The Diagnostic Procedure in EC section contains a descr iption based on open circuit inspection. A short circuit inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in
GI-27, "
Repair or replace the malfunction parts. If malfunctioning part cannot be detected, perform EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT" .
Once you have repaired the circuit or replaced a compo nent , you need to run the engine in the same conditions and circumstances which resul te d in the custo me r' s init ia l comp la in t. Perform the DTC Confirmation Procedure and confirm the normal code [DTC No. P0000] is detected. If the incident is still detected in the final check, perform STEP VI by using a method di fferent from the pr evi ous on e. Before returning the vehicle to the customer, be sure to erase the unnecessary (alrea dy fixed) (1st trip) DTC in ECM and TCM (Transmission control module). (Refer to EC-64, "
INFORMATION" and AT-38, "HOW TO ERASE DTC" .)
DIAGNOSTIC WORKSHEET" .
How to Perform Efficient Diagnosis for an Electrical Incident" .
, EC-122 .
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
.)
HOW TO ERASE EMISSION-RELA TED DIAGNOSTIC
A
EC
.) The (1st trip) DTC and the (1st trip)
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.) Then perform inspections
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DIAGNOSTIC WORKSHEET Description
There are many opera ting conditio ns that lead to th e malfunction o f engine compon ent s. A g ood g rasp of such condit ions can ma ke tro u­bleshooting faster and more accurate. In general, each customer feels differently about a incident. It is important to fully understand the symptoms or conditions for a cus­tomer complaint. Utilize a diagnostic worksheet like the one on the next page in order to organize all the information for troubleshooting. Some conditions may cause the MIL to come on steady or blink and DTC to be detected. Examples:
● Vehi cle ran out of fue l, which caused the engine to mi sfire.
Revision; 2004 April 2003 G35 Coupe
EC-77
SEF907L
TROUBLE DIAGNOSIS
● Fuel filler cap was left off or incorrectly screwed on, allowing fuel to evaporat e into the atmosphere.
Worksheet Sample
MTBL0017

DTC Inspection Priority Chart ABS0037R

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart.
NOTE: If DTC U1000 and/or U1001 is displayed with other DTC, first perform th e trouble diagnosis for DTC U1000, U1001. Refer to EC-140
.
Revision; 2004 April 2003 G35 Coupe
EC-78
TROUBLE DIAGNOSIS
Priority Detected items (DTC)
1
2
● U1000 U1001 CAN communication line
● P0101 P0102 P0103 Mass air flow sensor
● P0112 P0113 P0127 Intake air temperature sensor
● P0117 P0118 P0125 Engine coolant temperature sensor
● P0128 Thermostat function
● P0122 P0123 P0222 P0223 P1225 P1226 P1229 P2135 Throttle pos ition sens or
● P0181 P0182 P0183 Fuel tank temperature sensor
● P0327 P0328 Knock sensor
● P0335 Crankshaft position sensor (POS)
● P0340 P0345 Camshaft position sensor (PHASE)
● P0460 P0461 P0462 Fuel level sensor
● P0500 Vehicle speed sensor
● P0605 ECM
● P0705 Park/Neutral position (PNP) switch
● P1229 Sensor power supply
● P1610 - P1615 NATS
● P1706 Park/Neutral position (PNP) switch
● P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
● P0031P0032 P0051 P0052 Heated oxygen sensor 1 heater
● P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
● P0132 P0133 P0134 P0152 P0153 P0154 P1143 P1144 P1163 P1164 Heated oxygen sensor 1
● P0138 P0139 P0158 P0159 P1146 P1147 P1166 P1167 Heated oxygen sensor 2
● P0441 EVAP control system purge flow monitoring
● P0444 P0445 P1444 EVAP canister purge volume control solenoid valve
● P0447 P1446 EVAP canister vent control valve
● P0451 P0452 P0453 EVAP control system pressure sensor
● P0550 Power steering pressure sensor
● P0710 P0720 P0725 P0740 P0744 P0745 P1705 P1716 P1730 P1752 P1754 P1757 P1759 P1762 P1764 P1767
P1769 P1772 P1774 A/T related sensors, solenoid valves and switches
● P1065 ECM power supp ly
● P1111 P1136 Intake valve timing cont rol sol enoid valve
● P1122 Electric throttle control function
● P1124 P1126 P1128 Electric throttle control actuator
● P1217 Engine over temperature (OVERHEAT)
● P1805 Brake switch
3
● P0011 P0021 Intake valve timing control
● P0171 P0172 P0174 P0175 Fuel injection system function
● P0300 - P0306 Misfire
● P0420 P0430 Three way catalyst function
● P0442 P0456 EVAP control system
● P0506 P0507 Idle speed control system
● P1121 Electric throttle control actuator
● P1148 P1168 Closed loop control
● P1211 TCS control unit
● P1212 TCS communication line
● P1564 ASCD steering switch
● P1572 ASCD brake switch
● P1574 ASCD vehicle speed sensor
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Revision; 2004 April 2003 G35 Coupe
EC-79
TROUBLE DIAGNOSIS

Fail-Safe Chart ABS0037S

When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC No. Detected items Engine operating condition in fail-safe mode
P0102 P0103
P0117 P0118
P0122 P0123 P0222 P0223 P2135
P1121 Electric throttle control
P1122 Electric throttle control
P1124 P1126
P1128 Throttle control motor E C M stops the electric throttl e control actuator control, throttle valve is maintained at a
P1229 Sensor po we r sup pl y ECM stops the electric throttle control actuator control, throttle valv e is maintained at a
P2122 P2123 P2127 P2128 P2138
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
Engine coolant tempera­ture sensor circuit
Throttle position sensor ECM controls the electric throttle control actuator in regulating the throttle openi ng i n
actuator
function Throttle control motor relay ECM stops the electric throttle control actuato r contr ol, th rott le va lv e is maintained at a
Accelerator pedal position sensor
Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON or START. CONSULT-II disp lay s the engi ne coolant temperature decided by ECM.
Condition
Just as ignition switch is turned ON or Start
More than approx. 4 minutes after ignition ON or Start
Except as shown above
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running.
order for the idle position to be within +10 degrees. ECM regulates the opening speed of the throttle valve to be slow er than the norm al con­dition. So, the acceleration will be poor.
(When electric throttle control actuator does not function properly due to the return spring malfunction:) ECM controls the electric throttle actuator by regulat ing the thro ttl e opening around the idle position. The engine speed will not rise more than 2,000 rpm .
(When throttle valve opening angle in fail-sa fe mode is not in specified range:) ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.
(When ECM detects the throttle valve is stuck open:) While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls. The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more.
ECM stops the electric throttle control actuator control, thrott le va lve is mai ntained at a fixed opening (approx. 5 degrees) by the retur n spring .
fixed opening (approx. 5 degrees) by the retur n spring .
fixed opening (approx. 5 degrees) by the retur n spring .
fixed opening (approx. 5 degrees) by the retur n spring . ECM controls the electric throttle control actuator in reg ulating t he th rott le openi ng i n
order for the idle position to be within +10 degrees. ECM regulates the opening speed of the throttle valve to be slow er than the norm al con­dition. So, the acceleration will be poor.
Engine coolant temperature decided
(CONSULT-II display)
40°C (104°F)
80°C (176°F)
40 - 80°C (104 - 176°F)
(Depends on the time)
● When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting MIL up when
there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the driver to repair the malfunctio n.
Engine operating condition in fail-safe mode Eng ine speed will not rise more than 2,500 rpm due to the fuel cut
Revision; 2004 April 2003 G35 Coupe
EC-80
TROUBLE DIAGNOSIS

Basic Inspection ABS0037T

1. INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
– Harness connectors for improper connections – Wiring harness for improper connections, pinches and cut – Vacuum hoses for splits, kinks and improper connections – Hoses and ducts for leaks – Air cleaner clogging – Gasket
3. Confirm that electrical or mechanical loads ar e not applied.
– Headlamp switch is OFF. – Air conditioner switch is OFF. – Rear window defogger switch is OFF. – Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge. Ensure engine stays below 1,000 rpm.
SEF983U
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5. Run engine at about 2,000 rpm for ab out 2 minutes under no -
load.
6. Make sure that no DTC is displayed with CONSULT-II or GST. OK or NG
OK >> GO TO 3. NG >> GO TO 2.
2. REPAIR OR REPLACE
Repair or re place components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
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Revision; 2004 April 2003 G35 Coupe
EC-81
TROUBLE DIAGNOSIS
3. CHECK TARGET IDLE SPEED
With CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no­load, then run engine at idle speed for about 1 minute.
3. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
SEF978U
Without CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engin e ( 2,0 00 t o 3 ,00 0 r pm ) tw o or t hre e t i mes unde r no -lo ad , then r un en gine at i dl e s peed fo r ab out 1 minute.
3. Check idle speed.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
OK or NG
OK >> GO TO 10. NG >> GO TO 4.
4. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-46, "
>> GO TO 5.
Accelerator Pedal Released Position Learning" .
5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-46, "
Throttle Valve Closed Position Learning" .
SEF058Y
>> GO TO 6.
Revision; 2004 April 2003 G35 Coupe
EC-82
TROUBLE DIAGNOSIS
6. PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-46, "
Is Idle Air Volume Learning carried out successfully?
YES or NO
YES >> GO TO 7. NO >> 1. Follow the instruction of Idle Air Volume Learning.
Idle Air Volume Learning" .
2. GO TO 4.
7. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
OK or NG
OK >> GO TO 10. NG >> GO TO 8.
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8. DETECT MALFUNCTIONING PART
Check the followin g.
● Check camshaft position sensor (PHASE) and circuit. Refer to EC-307 .
● Check crankshaft position sensor (POS) and circuit. Refer to EC-301 .
OK or NG
OK >> GO TO 9. NG >> 1. Repair or replace.
2. GO TO 4.
9. CHECK ECM FUNCTION
1. Substitute another kno wn-good ECM to check ECM function. (E CM may be the cause o f a incide nt, but this is the rarely the case.)
2. Perform initializ at io n of IVI S (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to EC-
66, "IVIS (Infiniti Vehicle Immobilizer System — NATS)" .
>> GO TO 4.
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Revision; 2004 April 2003 G35 Coupe
EC-83
TROUBLE DIAGNOSIS
10. CHECK IGNITION TIMING
1. Run engine at idle.
2. Check ignition timing with a timing light.
A/T: 15 ± 5° BTDC (in P or N position) M/T: 15 ± 5° BTDC (in N position)
OK or NG
OK >> INSPECTION END NG >> GO TO 11.
11. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-46, "
>> GO TO 12.
Accelerator Pedal Released Position Learning" .
PBIB1655E
12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-46, "
>> GO TO 13.
Throttle Valve Closed Position Learning" .
13. PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-46, "
Is Idle Air Volume Learning carried out successfully?
YES or NO
YES >> GO TO 14. NO >> 1. Follow the instruction of Idle Air Volume Learning.
Idle Air Volume Learning" .
2. GO TO 4.
14. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in N position)
OK or NG
OK >> GO TO 15. NG >> GO TO 17.
Revision; 2004 April 2003 G35 Coupe
EC-84
TROUBLE DIAGNOSIS
15. CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
A/T: 15 ± 5° BTDC (in P or N position) M/T: 15 ± 5° BTDC (in N position)
OK or NG
OK >> INSPECTION END NG >> GO TO 16.
16. CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-50, " OK or NG
OK >> GO TO 17. NG >> 1. Repair the timing chain installation.
2. GO TO 4.
TIMING CHAIN" .
17. DETECT MALFUNCTIONING PART
Check the followin g.
● Check camshaft position sensor (PHASE) and circuit. Refer to EC-307 .
● Check crankshaft position sensor (POS) and circuit. Refer to EC-301 .
OK or NG
OK >> GO TO 18. NG >> 1. Repair or replace.
2. GO TO 4.
18. CHECK ECM FUNCTION
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1. Substitute another kno wn-good ECM to check ECM function. (E CM may be the cause o f a incide nt, but this is the rarely the case.)
2. Perform initializ at io n of IVI S (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to EC-
66, "IVIS (Infiniti Vehicle Immobilizer System — NATS)" .
>> GO TO 4.
Revision; 2004 April 2003 G35 Coupe
EC-85
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TROUBLE DIAGNOSIS

Symptom Matri x Chart AB S0037U

SYSTEM — BASIC ENGINE CONTROL SYSTEM
SYMPTOM
Reference page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTER Y DEAD (UNDER CHARGE) Warranty symptom code AA AB AC AD AE AF AG AH AJ AK A L AM HA Fuel Fuel pump circuit 11232 22 3 2EC-598
Fuel pressure regulator system 334444444 4 EC-48 Injector circuit 11232 22 2 EC-592 Evaporative emission system 334444444 4 EC-630
Air Positive crankcase ventilation sys-
tem Incorrect idle speed adjustment 1 1 1 1 1 EC-35
Electric throttle control actuator 112332222 2 2
IgnitionIncorrect ignition timing adjustment33111 11 1 EC-35
Ignition circuit 11222 22 2 EC-580
Main power supply and ground circuit 22333 33 23 EC-133
Mass air flow sensor circuit
Engine coolant temperature sensor circui t
Heated oxygen sensor 1 circuit
Throttle position sensor circuit
Accelerator pedal position sensor circuit 3 2 1
Knock sensor circuit 2 3 EC-29 6 Crankshaft position sensor (POS) ci rc uit 2 2 EC-301 Camshaft position sensor (PHASE) circuit 3 2 EC-307 Vehicle speed signal circuit 2 3 3 3 EC-390 Power steering pressure sensor circuit 2 3 3 EC-396
33
1
4444444 41 EC-642
2
33
3
12
222 2
22
EC-415 EC-417
EC-162 EC-170
EC-182 EC-194
EC-202, EC-212 EC-225 EC-433 EC-439
EC-187 EC-283 EC-486 EC-488 EC-490 EC-564
EC-550 EC-557 EC-571
,
,
,
, , ,
, , , , ,
, ,
Revision; 2004 April 2003 G35 Coupe
EC-86
TROUBLE DIAGNOSIS
SYMPTOM
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/ SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
ECM 22333333333 Intake valve timing control solenoid valve cir-
cuit PNP switch circuit 3 3 3 3 3 EC-535 Refrigerant pressure sensor circuit 2 3 3 4 EC-604 Electrical load signal circuit 3 EC-609 Air conditioner circuit 223333333 3 2ATC-42 VDC/TCS/ABS control unit 4 BRC-15
1 - 6: The numbers refer to the order of inspection. (continued on next page)
32 13223 3 EC-408
SYSTEM — ENGINE MECHANICAL & OTHER
SYMPTOM
Reference page
BATTERY DEAD (UNDER CHARGE)
EC-401
,
EC-404
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Reference page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/ SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE /LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE) Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA Fuel Fuel tank
Fuel piping 5 5 5 5 5 5 EM-34 Vapor lock — Valve deposit Poor fuel (Heavy weight gaso-
line, Low octane)
Revision; 2004 April 2003 G35 Coupe
5
5
5 555 55 5
EC-87
FL-11
—
—
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TROUBLE DIAGNOSIS
SYMPTOM
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/ SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA Air Air duct
Air cleaner EM-14 Air leakage from air duct
(Mass air flow sensor — electric throttle control actuator)
Electric throttle control actuator EM-16 Air leakage from intake manifold/
Collector/Gasket
Cranking Battery
Generator circuit SC-20 Starter circuit 3 SC-10 Signal plate 6 EM-98 PNP switch
55555 5
5555
111111
1
4
Engine Cylinder head
Cylinder head gasket 4 3 Cylinder block Piston Piston ring Connecting rod Bearing Crankshaft
Valve mecha­nism
Exhaust Exhaust manifold/Tube/Muffler/
Lubrica­tion
Timing chain Camshaft EM-66 Intake valve timing control EM-50 Intake valve Exhaust valve
Gasket Three way catalyst Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler
Oil level (Low)/Filthy oil LU-6
55555 55 5 EM-81
66666 66 6
55555 55 5
55555 55 5
55555 55 5
Reference page
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
EM-14
EM-14
EM-16, EM-20
SC-4
1
AT-105 or MT-12
4
EM-98
EM-50
3 EM-81
EM-22 3
EM-26 12 , LU-9 , LU-10
, EX-
, LU-
Revision; 2004 April 2003 G35 Coupe
EC-88
TROUBLE DIAGNOSIS
SYMPTOM
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/ SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA Cooling Radiator/Ho se/ R adiat or fill er ca p
Thermostat 5 CO-24 Water pump CO-20 Water gallery CO-26 Coolant level (Low)/Contami-
nated coolant
IVIS (Infiniti Vehicle Immobilizer System — NATS)
1 - 6: The numbers refer to the order of inspection.
55555 55 45
5 CO-9
11
Reference page
BATTERY DEAD (UNDER CHARGE)
CO-12, CO-16
EC-66 or BL-122
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Revision; 2004 April 2003 G35 Coupe
EC-89
TROUBLE DIAGNOSIS

Engine Control Component Parts Location ABS0037V

PBIB1272E
Revision; 2004 April 2003 G35 Coupe
EC-90
TROUBLE DIAGNOSIS
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PBIB1273E
Revision; 2004 April 2003 G35 Coupe
EC-91
TROUBLE DIAGNOSIS
PBIB1274E
Revision; 2004 April 2003 G35 Coupe
EC-92
TROUBLE DIAGNOSIS
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EC
C
D
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F
PBIB1189E
G
PBIB1284E
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Revision; 2004 April 2003 G35 Coupe
EC-93
TROUBLE DIAGNOSIS
PBIB1275E
Revision; 2004 April 2003 G35 Coupe
EC-94
TROUBLE DIAGNOSIS
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PBIB1276E
Revision; 2004 April 2003 G35 Coupe
EC-95
TROUBLE DIAGNOSIS

Circuit Diagram ABS0037W

TBWT0251E
Revision; 2004 April 2003 G35 Coupe
EC-96
TROUBLE DIAGNOSIS
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TBWT0252E
Revision; 2004 April 2003 G35 Coupe
EC-97
TROUBLE DIAGNOSIS

ECM Harness Connector Terminal Layout ABS0037X

PBIB1192E

ECM Terminals and Reference Value ABS0037Y

PREPARATION
1. ECM is located behind the passenger side instrument lower panel. For this inspection, remove passenger side instrument lower panel.
2. Remove ECM harness connector.
3. When disconnecting ECM harness connector, loosen it with levers as f ar as they will go as shown at right.
4. Connect a break-out box (SST) and Y-cable adapter (SST) between the ECM and ECM harness c onnector.
● Use extreme care not to touch 2 pins at one time.
● Data is for comparison and may not be exact.
ECM INSPECTION TABLE
Specification data are r eference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground term inals whe n mea suring in put/outp ut voltage. Doing s o may re sult in da m­age to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
1 B ECM ground
ITEM CONDITION DATA (DC Voltage)
[Engine is running]
● Idle speed
Engine ground
PBIB1278E
SEC406D
Revision; 2004 April 2003 G35 Coupe
EC-98
TROUBLE DIAGNOSIS
TER-
MINAL
NO.
WIRE
COLOR
2Y
3W/R
4BR
ITEM CONDITION DATA (DC Voltage)
Heated oxygen sensor 1 heater (bank 2)
Throttle control motor re la y power supply
Throttle control motor (Close)
[Engine is running]
● Warm-up condition
● Engine speed is below 3,600 rpm.
[Engine is running]
● Engine speed is above 3,600 rpm.
[Ignition switch: ON]
[Ignition switch: ON]
● Engine stopped
● Sh ift lever: D (A/T) or 1st (M/T)
● Ac celera to r peda l is releasing
Approximately 8V
BATTERY VOLTAGE (11 - 14V)
BATTERY VOLTAGE (11 - 14V)
0 - 14V
0 - 14V
A
EC
C
PBIB0519E
D
E
F
G
PBIB1104E
H
5G
Throttle control motor (Open)
6BR/W
10 W/G
Heated oxygen sensor 2 heater (bank 2)
Intake valve timing control solenoid valve (bank 2)
[Ignition switch: ON]
● Engine stopped
● Sh ift lever: D (A/T) or 1st (M/T)
● Ac cel era to r peda l is depressing
[Engine is running]
● Engine speed is below 3,600 rpm after the
following conditions are met.
– Engine: after warming up – Keeping the engine speed bet ween 3,500
and 4,000 rpm for 1 minute and at idle for 1 minute under no load.
[Ignition switch: ON]
● Engine stopped
[Engine is running]
● Engine speed is above 3,600 rpm.
[Engine is running]
● Warm-up condition
● Idle speed
[Engine is running]
● Warm-up condition
● When revving engine up to 2,500 rpm
quickly
0 - 1.0V
BATTERY VOLTAGE (11 - 14V)
BATTERY VOLTAGE (11 - 14V)
7 - 12V
PBIB1105E
J
K
L
M
PBIB1790E
Revision; 2004 April 2003 G35 Coupe
EC-99
TROUBLE DIAGNOSIS
TER-
MINAL
NO.
11 R/W
12 L/W
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
Intake valve timing control solenoid valve (bank 1)
Power steering pressure sensor
[Engine is running]
● Warm-up condition
● Idle speed
[Engine is running]
● Warm-up condition
● W hen revving engine up to 2,500 rpm
quickly
[Engine is running]
● Steering wheel is being turned.
[Engine is running]
● Steering wheel is not being turn ed.
[Engine is running]
● Warm-up condition
● Idle speed
BATTER Y VOLTAGE (11 - 14V)
7 - 12V
PBIB1790E
0.5 - 4.5V
0.4 - 0.8V
Approximately 1.2V
13 BR
Crankshaft position sensor (POS)
14 Y
Camshaft position sensor (PHASE) (bank 2)
PBIB1041E
Approximately 1.1V
[Engine is running]
● Engine speed is 2,000 rpm.
PBIB1042E
1.0 - 4.0V
[Engine is running]
● Warm-up condition
● Idle speed
PBIB1039E
1.0 - 4.0V
[Engine is running]
● Engine speed is 2,000 rpm.
PBIB1040E
15 W Knock sensor
[Engine is running]
● Idle speed
Approximately 2.5V
[Engine is running]
16 LG
Heated oxygen sensor 1 (bank 2)
Revision; 2004 April 2003 G35 Coupe
● Warm-up condition
● Engine speed is 2,000 rpm.
EC-100
0 - Approximately 1.0V (Periodically change)
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