2004 INFINITI QX56 Factory Service Manual

wheel size load capacity headlight bulb towing battery replacement maintenance

Page 1193 of 3371

INFINITI QX56 2004 Factory Service Manual EC-2Revision: August 20072004 QX56 Wiring Diagram .....................................................140
Diagnostic Procedure ...........................................143
Component Inspection .

EC-2Revision: August 20072004 QX56 Wiring Diagram .....................................................140
Diagnostic Procedure ...........................................143
Component Inspection ..........................................145
Removal and Installation ......................................145
DTC P0101 MAF SENSOR .....................................146
Component Description ........................................146
CONSULT-II Reference Value in Data Monitor Mode
.146
On Board Diagnosis Logic ....................................146
DTC Confirmation Procedure ...............................147
Overall Function Check ........................................148
Wiring Diagram .....................................................149
Diagnostic Procedure ...........................................150
Component Inspection ..........................................153
Removal and Installation ......................................153
DTC P0102, P0103 MAF SENSOR .........................154
Component Description ........................................154
CONSULT-II Reference Value in Data Monitor Mode
.154
On Board Diagnosis Logic ....................................154
DTC Confirmation Procedure ...............................155
Wiring Diagram .....................................................156
Diagnostic Procedure ...........................................157
Component Inspection ..........................................160
Removal and Installation ......................................160
DTC P0112, P0113 IAT SENSOR ...........................161
Component Description ........................................161
On Board Diagnosis Logic ....................................161
DTC Confirmation Procedure ...............................161
Wiring Diagram .....................................................162
Diagnostic Procedure ...........................................163
Component Inspection ..........................................164
Removal and Installation ......................................164
DTC P0117, P0118 ECT SENSOR ..........................165
Component Description ........................................165
On Board Diagnosis Logic ....................................165
DTC Confirmation Procedure ...............................166
Wiring Diagram .....................................................167
Diagnostic Procedure ...........................................168
Component Inspection ..........................................169
Removal and Installation ......................................170
DTC P0122, P0123 TP SENSOR ............................171
Component Description ........................................171
CONSULT-II Reference Value in Data Monitor Mode
.171
On Board Diagnosis Logic ....................................171
DTC Confirmation Procedure ...............................172
Wiring Diagram .....................................................173
Diagnostic Procedure ...........................................174
Component Inspection ..........................................177
Removal and Installation ......................................177
DTC P0125 ECT SENSOR ......................................178
Component Description ........................................178
On Board Diagnosis Logic ....................................178
DTC Confirmation Procedure ...............................179
Diagnostic Procedure ...........................................179
Component Inspection ..........................................180
Removal and Installation ......................................180
DTC P0127 IAT SENSOR .......................................181Component Description ........................................ 181
On Board Diagnosis Logic .................................... 181
DTC Confirmation Procedure ................................ 181
Diagnostic Procedure ............................................ 182
Component Inspection .......................................... 183
Removal and Installation ....................................... 183
DTC P0128 THERMOSTAT FUNCTION ................. 184
On Board Diagnosis Logic .................................... 184
DTC Confirmation Procedure ................................ 184
Diagnostic Procedure ............................................ 184
Component Inspection .......................................... 184
Removal and Installation ....................................... 185
DTC P0138, P0158 HO2S2 ..................................... 186
Component Description ........................................ 186
CONSULT-II Reference Value in Data Monitor Mode
. 186
On Board Diagnosis Logic .................................... 186
DTC Confirmation Procedure ................................ 187
Wiring Diagram ..................................................... 188
Diagnostic Procedure ............................................ 191
Component Inspection .......................................... 194
Removal and Installation ....................................... 195
DTC P0139, P0159 HO2S2 ..................................... 196
Component Description ........................................ 196
CONSULT-II Reference Value in Data Monitor Mode
. 196
On Board Diagnosis Logic .................................... 196
DTC Confirmation Procedure ................................ 197
Overall Function Check ......................................... 197
Wiring Diagram ..................................................... 199
Diagnostic Procedure ............................................ 202
Component Inspection .......................................... 205
Removal and Installation ....................................... 207
DTC P0171, P0174 FUEL INJECTION SYSTEM
FUNCTION .............................................................. 208
On Board Diagnosis Logic .................................... 208
DTC Confirmation Procedure ................................ 208
Wiring Diagram ..................................................... 210
Diagnostic Procedure ............................................ 212
DTC P0172, P0175 FUEL INJECTION SYSTEM
FUNCTION .............................................................. 217
On Board Diagnosis Logic .................................... 217
DTC Confirmation Procedure ................................ 217
Wiring Diagram ..................................................... 219
Diagnostic Procedure ............................................ 221
DTC P0181 FTT SENSOR ...................................... 225
Component Description ........................................ 225
On Board Diagnosis Logic .................................... 225
DTC Confirmation Procedure ................................ 225
Wiring Diagram ..................................................... 227
Diagnostic Procedure ............................................ 228
Component Inspection .......................................... 229
Removal and Installation ....................................... 230
DTC P0182, P0183 FTT SENSOR .......................... 231
Component Description ........................................ 231
On Board Diagnosis Logic .................................... 231
DTC Confirmation Procedure ................................ 231
Wiring Diagram ..................................................... 232
Diagnostic Procedure ............................................ 233

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INFINITI QX56 2004 Factory Service Manual EC-3
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Revision: August 20072004 QX56 Component Inspection ......................................... 234
Removal and Installation ...................................... 235
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Revision: August 20072004 QX56 Component Inspection ......................................... 234
Removal and Installation ...................................... 235
DTC P0222, P0223 TP SENSOR ........................... 236
Component Description ........................................ 236
CONSULT-II Reference Value in Data Monitor Mode
. 236
On Board Diagnosis Logic ................................... 236
DTC Confirmation Procedure ............................... 237
Wiring Diagram .................................................... 238
Diagnostic Procedure ........................................... 239
Component Inspection ......................................... 242
Removal and Installation ...................................... 242
DTC P0300 - P0308 MULTIPLE CYLINDER MIS-
FIRE, NO. 1 - 8 CYLINDER MISFIRE ..................... 243
On Board Diagnosis Logic ................................... 243
DTC Confirmation Procedure ............................... 243
Diagnostic Procedure ........................................... 244
DTC P0327, P0328, P0332, P0333 KS .................. 250
Component Description ........................................ 250
On Board Diagnosis Logic ................................... 250
DTC Confirmation Procedure ............................... 250
Wiring Diagram .................................................... 251
Diagnostic Procedure ........................................... 252
Component Inspection ......................................... 254
Removal and Installation ...................................... 254
DTC P0335 CKP SENSOR (POS) .......................... 255
Component Description ........................................ 255
CONSULT-II Reference Value in Data Monitor Mode
. 255
On Board Diagnosis Logic ................................... 255
DTC Confirmation Procedure ............................... 255
Wiring Diagram .................................................... 256
Diagnostic Procedure ........................................... 257
Component Inspection ......................................... 260
Removal and Installation ...................................... 260
DTC P0340 CAMSHAFT POSITION (CMP) SEN-
SOR (PHASE) ......................................................... 261
Component Description ........................................ 261
On Board Diagnosis Logic ................................... 261
DTC Confirmation Procedure ............................... 261
Wiring Diagram .................................................... 262
Diagnostic Procedure ........................................... 263
Component Inspection ......................................... 266
Removal and Installation ...................................... 266
DTC P0420, P0430 THREE WAY CATALYST FUNC-
TION ........................................................................ 267
On Board Diagnosis Logic ................................... 267
DTC Confirmation Procedure ............................... 267
Overall Function Check ........................................ 268
Diagnostic Procedure ........................................... 269
DTC P0441 EVAP CONTROL SYSTEM ................ 271
System Description .............................................. 271
On Board Diagnosis Logic ................................... 271
DTC Confirmation Procedure ............................... 271
Overall Function Check ........................................ 272
Diagnostic Procedure ........................................... 273
DTC P0442 EVAP CONTROL SYSTEM ................ 276
On Board Diagnosis Logic ................................... 276DTC Confirmation Procedure ...............................277
Diagnostic Procedure ...........................................278
DTC P0444, P0445 EVAP CANISTER PURGE VOL-
UME CONTROL SOLENOID VALVE ......................285
Description ............................................................285
CONSULT-II Reference Value in Data Monitor Mode
.285
On Board Diagnosis Logic ....................................286
DTC Confirmation Procedure ...............................286
Wiring Diagram .....................................................287
Diagnostic Procedure ...........................................289
Component Inspection ..........................................290
Removal and Installation ......................................291
DTC P0447 EVAP CANISTER VENT CONTROL
VALVE .....................................................................292
Component Description ........................................292
CONSULT-II Reference Value in Data Monitor Mode
.292
On Board Diagnosis Logic ....................................292
DTC Confirmation Procedure ...............................293
Wiring Diagram .....................................................294
Diagnostic Procedure ...........................................295
Component Inspection ..........................................297
DTC P0451 EVAP CONTROL SYSTEM PRESSURE
SENSOR .................................................................299
Component Description ........................................299
CONSULT-II Reference Value in Data Monitor Mode
.299
On Board Diagnosis Logic ....................................299
DTC Confirmation Procedure ...............................300
Diagnostic Procedure ...........................................300
Component Inspection ..........................................301
DTC P0452 EVAP CONTROL SYSTEM PRESSURE
SENSOR .................................................................302
Component Description ........................................302
CONSULT-II Reference Value in Data Monitor Mode
.302
On Board Diagnosis Logic ....................................302
DTC Confirmation Procedure ...............................303
Wiring Diagram .....................................................304
Diagnostic Procedure ...........................................305
Component Inspection ..........................................307
DTC P0453 EVAP CONTROL SYSTEM PRESSURE
SENSOR .................................................................308
Component Description ........................................308
CONSULT-II Reference Value in Data Monitor Mode
.308
On Board Diagnosis Logic ....................................308
DTC Confirmation Procedure ...............................309
Wiring Diagram .....................................................310
Diagnostic Procedure ...........................................311
Component Inspection ..........................................315
DTC P0455 EVAP CONTROL SYSTEM .................316
On Board Diagnosis Logic ....................................316
DTC Confirmation Procedure ...............................317
Diagnostic Procedure ...........................................318
DTC P0456 EVAP CONTROL SYSTEM .................324
On Board Diagnosis Logic ....................................324
DTC Confirmation Procedure ...............................325

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INFINITI QX56 2004 Factory Service Manual EC-4Revision: August 20072004 QX56 Overall Function Check ........................................326
Diagnostic Procedure ...........................................327
DTC P0460 FUEL LEVEL SENSOR

EC-4Revision: August 20072004 QX56 Overall Function Check ........................................326
Diagnostic Procedure ...........................................327
DTC P0460 FUEL LEVEL SENSOR .......................334
Component Description ........................................334
On Board Diagnosis Logic ....................................334
DTC Confirmation Procedure ...............................334
Diagnostic Procedure ...........................................335
Removal and Installation ......................................335
DTC P0461 FUEL LEVEL SENSOR .......................336
Component Description ........................................336
On Board Diagnosis Logic ....................................336
Overall Function Check ........................................336
Diagnostic Procedure ...........................................337
Removal and Installation ......................................337
DTC P0462, P0463 FUEL LEVEL SENSOR CIR-
CUIT ........................................................................338
Component Description ........................................338
On Board Diagnosis Logic ....................................338
DTC Confirmation Procedure ...............................338
Diagnostic Procedure ...........................................339
Removal and Installation ......................................339
DTC P0500 VSS ......................................................340
Description ............................................................340
On Board Diagnosis Logic ....................................340
DTC Confirmation Procedure ...............................340
Overall Function Check ........................................340
Diagnostic Procedure ...........................................341
DTC P0506 ISC SYSTEM .......................................342
Description ............................................................342
On Board Diagnosis Logic ....................................342
DTC Confirmation Procedure ...............................342
Diagnostic Procedure ...........................................343
DTC P0507 ISC SYSTEM .......................................344
Description ............................................................344
On Board Diagnosis Logic ....................................344
DTC Confirmation Procedure ...............................344
Diagnostic Procedure ...........................................345
DTC P0550 PSP SENSOR ......................................346
Component Description ........................................346
CONSULT-II Reference Value in Data Monitor Mode
.346
On Board Diagnosis Logic ....................................346
DTC Confirmation Procedure ...............................346
Wiring Diagram .....................................................347
Diagnostic Procedure ...........................................348
Component Inspection ..........................................350
Removal and Installation ......................................350
DTC P0605 ECM .....................................................351
Component Description ........................................351
On Board Diagnosis Logic ....................................351
DTC Confirmation Procedure ...............................351
Diagnostic Procedure ...........................................352
DTC P1031, P1032, P1051, P1052 A/F SENSOR 1
HEATER ..................................................................354
Description ............................................................354
CONSULT-II Reference Value in Data Monitor Mode
.354
On Board Diagnosis Logic ....................................354
DTC Confirmation Procedure ...............................354Wiring Diagram ..................................................... 355
Diagnostic Procedure ............................................ 358
Component Inspection .......................................... 360
Removal and Installation ....................................... 360
DTC P1065 ECM POWER SUPPLY ........................ 361
Component Description ........................................ 361
On Board Diagnosis Logic .................................... 361
DTC Confirmation Procedure ................................ 361
Wiring Diagram ..................................................... 362
Diagnostic Procedure ............................................ 363
DTC P1121 ELECTRIC THROTTLE CONTROL
ACTUATOR ............................................................. 365
Component Description ........................................ 365
On Board Diagnosis Logic .................................... 365
DTC Confirmation Procedure ................................ 365
Diagnostic Procedure ............................................ 366
DTC P1122 ELECTRIC THROTTLE CONTROL
FUNCTION .............................................................. 367
Description ............................................................ 367
On Board Diagnosis Logic .................................... 367
DTC Confirmation Procedure ................................ 367
Wiring Diagram ..................................................... 368
Diagnostic Procedure ............................................ 369
Component Inspection .......................................... 372
Remove and Installation ....................................... 372
DTC P1124, P1126 THROTTLE CONTROL MOTOR
RELAY ..................................................................... 373
Component Description ........................................ 373
CONSULT-II Reference Value in Data Monitor Mode
. 373
On Board Diagnosis Logic .................................... 373
DTC Confirmation Procedure ................................ 373
Wiring Diagram ..................................................... 375
Diagnostic Procedure ............................................ 376
DTC P1128 THROTTLE CONTROL MOTOR ......... 378
Component Description ........................................ 378
On Board Diagnosis Logic .................................... 378
DTC Confirmation Procedure ................................ 378
Wiring Diagram ..................................................... 379
Diagnostic Procedure ............................................ 380
Component Inspection .......................................... 381
Removal and Installation ....................................... 382
DTC P1146, P1166 HO2S2 ..................................... 383
Component Description ........................................ 383
CONSULT-II Reference Value in Data Monitor Mode
. 383
On Board Diagnosis Logic .................................... 383
DTC Confirmation Procedure ................................ 384
Overall Function Check ......................................... 384
Wiring Diagram ..................................................... 386
Diagnostic Procedure ............................................ 389
Component Inspection .......................................... 392
Removal and Installation ....................................... 394
DTC P1147, P1167 HO2S2 ..................................... 395
Component Description ........................................ 395
CONSULT-II Reference Value in Data Monitor Mode
. 395
On Board Diagnosis Logic .................................... 395
DTC Confirmation Procedure ................................ 396

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INFINITI QX56 2004 Factory Service Manual EC-5
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Revision: August 20072004 QX56 Overall Function Check ........................................ 396
Wiring Diagram ....................................................

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Revision: August 20072004 QX56 Overall Function Check ........................................ 396
Wiring Diagram .................................................... 398
Diagnostic Procedure ........................................... 401
Component Inspection ......................................... 404
Removal and Installation ...................................... 406
DTC P1148, P1168 CLOSED LOOP CONTROL .... 407
On Board Diagnosis Logic ................................... 407
DTC P1211 TCS CONTROL UNIT ......................... 408
Description ........................................................... 408
On Board Diagnosis Logic ................................... 408
DTC Confirmation Procedure ............................... 408
Diagnostic Procedure ........................................... 408
DTC P1212 TCS COMMUNICATION LINE ............ 409
Description ........................................................... 409
On Board Diagnosis Logic ................................... 409
DTC Confirmation Procedure ............................... 409
Diagnostic Procedure ........................................... 409
DTC P1217 ENGINE OVER TEMPERATURE ....... 410
Description ........................................................... 410
CONSULT-II Reference Value in Data Monitor Mode
. 410
On Board Diagnosis Logic .................................... 411
Overall Function Check ......................................... 411
Wiring Diagram .................................................... 413
Diagnostic Procedure ........................................... 415
Main 12 Causes of Overheating ........................... 418
Component Inspection ......................................... 419
DTC P1225 TP SENSOR ........................................ 420
Component Description ........................................ 420
On Board Diagnosis Logic ................................... 420
DTC Confirmation Procedure ............................... 420
Diagnostic Procedure ........................................... 421
Removal and Installation ...................................... 421
DTC P1226 TP SENSOR ........................................ 422
Component Description ........................................ 422
On Board Diagnosis Logic ................................... 422
DTC Confirmation Procedure ............................... 422
Diagnostic Procedure ........................................... 423
Removal and Installation ...................................... 423
DTC P1229 SENSOR POWER SUPPLY ................ 424
On Board Diagnosis Logic ................................... 424
DTC Confirmation Procedure ............................... 424
Wiring Diagram .................................................... 425
Diagnostic Procedure ........................................... 426
DTC P1271, P1281 A/F SENSOR 1 ....................... 429
Component Description ........................................ 429
CONSULT-II Reference Value in Data Monitor Mode
. 429
On Board Diagnosis Logic ................................... 429
DTC Confirmation Procedure ............................... 429
Wiring Diagram .................................................... 431
Diagnostic Procedure ........................................... 434
Removal and Installation ...................................... 436
DTC P1272, P1282 A/F SENSOR 1 ....................... 437
Component Description ........................................ 437
CONSULT-II Reference Value in Data Monitor Mode
. 437
On Board Diagnosis Logic ................................... 437
DTC Confirmation Procedure ............................... 437Wiring Diagram .....................................................439
Diagnostic Procedure ...........................................442
Removal and Installation ......................................444
DTC P1273, P1283 A/F SENSOR 1 .......................445
Component Description ........................................445
CONSULT-II Reference Value in Data Monitor Mode
.445
On Board Diagnosis Logic ....................................445
DTC Confirmation Procedure ...............................445
Wiring Diagram .....................................................447
Diagnostic Procedure ...........................................450
Removal and Installation ......................................453
DTC P1274, P1284 A/F SENSOR 1 .......................454
Component Description ........................................454
CONSULT-II Reference Value in Data Monitor Mode
.454
On Board Diagnosis Logic ....................................454
DTC Confirmation Procedure ...............................454
Wiring Diagram .....................................................456
Diagnostic Procedure ...........................................459
Removal and Installation ......................................462
DTC P1276, P1286 A/F SENSOR 1 .......................463
Component Description ........................................463
CONSULT-II Reference Value in Data Monitor Mode
.463
On Board Diagnosis Logic ....................................463
DTC Confirmation Procedure ...............................463
Overall Function Check ........................................464
Wiring Diagram .....................................................466
Diagnostic Procedure ...........................................469
Removal and Installation ......................................471
DTC P1278, P1288 A/F SENSOR 1 .......................472
Component Description ........................................472
CONSULT-II Reference Value in Data Monitor Mode
.472
On Board Diagnosis Logic ....................................472
DTC Confirmation Procedure ...............................473
Wiring Diagram .....................................................475
Diagnostic Procedure ...........................................478
Removal and Installation ......................................483
DTC P1279, P1289 A/F SENSOR 1 .......................484
Component Description ........................................484
CONSULT-II Reference Value in Data Monitor Mode
.484
On Board Diagnosis Logic ....................................484
DTC Confirmation Procedure ...............................485
Wiring Diagram .....................................................487
Diagnostic Procedure ...........................................490
Removal and Installation ......................................495
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE ...............................496
Description ............................................................496
CONSULT-II Reference Value in Data Monitor Mode
.496
On Board Diagnosis Logic ....................................497
DTC Confirmation Procedure ...............................497
Wiring Diagram .....................................................498
Diagnostic Procedure ...........................................500

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INFINITI QX56 2004 Factory Service Manual EC-6Revision: August 20072004 QX56 Component Inspection ..........................................503
Removal and Installation ......................................503
DTC P1446 EVAP CANISTER VENT

EC-6Revision: August 20072004 QX56 Component Inspection ..........................................503
Removal and Installation ......................................503
DTC P1446 EVAP CANISTER VENT CONTROL
VALVE .....................................................................504
Component Description ........................................504
CONSULT-II Reference Value in Data Monitor Mode
.504
On Board Diagnosis Logic ....................................504
DTC Confirmation Procedure ...............................505
Wiring Diagram .....................................................506
Diagnostic Procedure ...........................................507
Component Inspection ..........................................508
DTC P1564 ICC STEERING SWITCH ....................510
Component Description ........................................510
CONSULT-II Reference Value in Data Monitor Mode
.510
On Board Diagnosis Logic ....................................510
DTC Confirmation Procedure ...............................510
Wiring Diagram .....................................................512
Diagnostic Procedure ...........................................514
Component Inspection ..........................................516
DTC P1564 ASCD STEERING SWITCH ................517
Component Description ........................................517
CONSULT-II Reference Value in Data Monitor Mode
.517
On Board Diagnosis Logic ....................................517
DTC Confirmation Procedure ...............................518
Wiring Diagram .....................................................519
Diagnostic Procedure ...........................................521
Component Inspection ..........................................522
DTC P1568 ICC FUNCTION ...................................524
On Board Diagnosis Logic ....................................524
DTC Confirmation Procedure ...............................524
Diagnostic Procedure ...........................................524
DTC P1572 ICC BRAKE SWITCH ..........................525
Component Description ........................................525
CONSULT-II Reference Value in Data Monitor Mode
.525
On Board Diagnosis Logic ....................................525
DTC Confirmation Procedure ...............................525
Wiring Diagram .....................................................527
Diagnostic Procedure ...........................................528
Component Inspection ..........................................532
DTC P1572 ASCD BRAKE SWITCH ......................534
Component Description ........................................534
CONSULT-II Reference Value in Data Monitor Mode
.534
On Board Diagnosis Logic ....................................534
DTC Confirmation Procedure ...............................535
Wiring Diagram .....................................................536
Diagnostic Procedure ...........................................537
Component Inspection ..........................................541
DTC P1574 ICC VEHICLE SPEED SENSOR .........542
Component Description ........................................542
On Board Diagnosis Logic ....................................542
DTC Confirmation Procedure ...............................542
Diagnostic Procedure ...........................................543
DTC P1574 ASCD VEHICLE SPEED SENSOR .....544
Component Description ........................................544On Board Diagnosis Logic .................................... 544
DTC Confirmation Procedure ................................ 544
Diagnostic Procedure ............................................ 545
DTC P1706 PNP SWITCH ....................................... 546
Component Description ........................................ 546
CONSULT-II Reference Value in Data Monitor Mode
. 546
On Board Diagnosis Logic .................................... 546
DTC Confirmation Procedure ................................ 546
Overall Function Check ......................................... 547
Wiring Diagram ..................................................... 548
Diagnostic Procedure ............................................ 549
DTC P1805 BRAKE SWITCH ................................. 551
Description ............................................................ 551
CONSULT-II Reference Value in Data Monitor Mode
. 551
On Board Diagnosis Logic .................................... 551
DTC Confirmation Procedure ................................ 551
Wiring Diagram ..................................................... 552
Diagnostic Procedure ............................................ 553
Component Inspection .......................................... 555
DTC P2122, P2123 APP SENSOR ......................... 556
Component Description ........................................ 556
CONSULT-II Reference Value in Data Monitor Mode
. 556
On Board Diagnosis Logic .................................... 556
DTC Confirmation Procedure ................................ 557
Wiring Diagram ..................................................... 558
Diagnostic Procedure ............................................ 559
Component Inspection .......................................... 561
Removal and Installation ....................................... 561
DTC P2127, P2128 APP SENSOR ......................... 562
Component Description ........................................ 562
CONSULT-II Reference Value in Data Monitor Mode
. 562
On Board Diagnosis Logic .................................... 562
DTC Confirmation Procedure ................................ 563
Wiring Diagram ..................................................... 564
Diagnostic Procedure ............................................ 565
Component Inspection .......................................... 568
Removal and Installation ....................................... 568
DTC P2135 TP SENSOR ........................................ 569
Component Description ........................................ 569
CONSULT-II Reference Value in Data Monitor Mode
. 569
On Board Diagnosis Logic .................................... 569
DTC Confirmation Procedure ................................ 570
Wiring Diagram ..................................................... 571
Diagnostic Procedure ............................................ 572
Component Inspection .......................................... 575
Removal and Installation ....................................... 575
DTC P2138 APP SENSOR ...................................... 576
Component Description ........................................ 576
CONSULT-II Reference Value in Data Monitor Mode
. 576
On Board Diagnosis Logic .................................... 576
DTC Confirmation Procedure ................................ 577
Wiring Diagram ..................................................... 578
Diagnostic Procedure ............................................ 579

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INFINITI QX56 2004 Factory Service Manual EC-7
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Revision: August 20072004 QX56 Component Inspection ......................................... 582
Removal and Installation ...................................... 582
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Revision: August 20072004 QX56 Component Inspection ......................................... 582
Removal and Installation ...................................... 582
IGNITION SIGNAL .................................................. 583
Component Description ........................................ 583
Wiring Diagram .................................................... 584
Diagnostic Procedure ........................................... 589
Component Inspection ......................................... 593
Removal and Installation ...................................... 594
INJECTOR CIRCUIT ............................................... 595
Component Description ........................................ 595
CONSULT-II Reference Value in Data Monitor Mode
. 595
Wiring Diagram .................................................... 596
Diagnostic Procedure ........................................... 597
Component Inspection ......................................... 600
Removal and Installation ...................................... 600
FUEL PUMP CIRCUIT ............................................ 601
Description ........................................................... 601
CONSULT-II Reference Value in Data Monitor Mode
. 601
Wiring Diagram .................................................... 602
Diagnostic Procedure ........................................... 603
Component Inspection ......................................... 606
Removal and Installation ...................................... 606
REFRIGERANT PRESSURE SENSOR ................. 607
Component Description ........................................ 607
Wiring Diagram .................................................... 608
Diagnostic Procedure ........................................... 609
Removal and Installation ....................................... 611
ELECTRICAL LOAD SIGNAL ................................ 612
Description ........................................................... 612
CONSULT-II Reference Value in Data Monitor Mode
. 612
Diagnostic Procedure ........................................... 612
ICC BRAKE SWITCH ............................................. 613
Component Description ........................................ 613
CONSULT-II Reference Value in Data Monitor Mode
. 613
Wiring Diagram .................................................... 614
Diagnostic Procedure ........................................... 615
Component Inspection ......................................... 619
ASCD BRAKE SWITCH ......................................... 621
Component Description ........................................ 621CONSULT-II Reference Value in Data Monitor Mode
.621
Wiring Diagram .....................................................622
Diagnostic Procedure ...........................................623
Component Inspection ..........................................627
ASCD INDICATOR ..................................................628
Component Description ........................................628
CONSULT-II Reference Value in Data Monitor Mode
.628
Wiring Diagram .....................................................629
Diagnostic Procedure ...........................................630
MIL AND DATA LINK CONNECTOR ......................631
Wiring Diagram .....................................................631
EVAPORATIVE EMISSION SYSTEM .....................633
Description ............................................................633
Component Inspection ..........................................636
Removal and Installation ......................................637
How to Detect Fuel Vapor Leakage ......................637
ON BOARD REFUELING VAPOR RECOVERY
(ORVR) ....................................................................640
System Description ...............................................640
Diagnostic Procedure ...........................................641
Component Inspection ..........................................643
POSITIVE CRANKCASE VENTILATION ...............645
Description ............................................................645
Component Inspection ..........................................645
AUTOMATIC SPEED CONTROL DEVICE (ASCD) .647
System Description ...............................................647
Component Description ........................................648
SERVICE DATA AND SPECIFICATIONS (SDS) ....649
Fuel Pressure .......................................................649
Idle Speed and Ignition Timing .............................649
Calculated Load Value ..........................................649
Mass Air Flow Sensor ...........................................649
Intake Air Temperature Sensor .............................649
Engine Coolant Temperature Sensor ...................649
A/F Sensor 1 Heater .............................................649
Heated Oxygen sensor 2 Heater ..........................649
Crankshaft Position Sensor (POS) .......................649
Camshaft Position Sensor (PHASE) ....................649
Throttle Control Motor ...........................................649
Injector ..................................................................650
Fuel Pump ............................................................650

Page 1199 of 3371

INFINITI QX56 2004 Factory Service Manual EC-8Revision: August 2007
INDEX FOR DTC
2004 QX56
INDEX FOR DTCPFP:00024
Alphabetical IndexUBS00GZ3
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC

Page 1200 of 3371

INFINITI QX56 2004 Factory Service Manual INDEX FOR DTC
EC-9
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56CMP SEN/CIRC-B1 P0340 0340 2×EC-261
CTP LEARNING P1225 1225 2 —EC-420
CTP LEARNING P1226 1226 2 —EC-422
CYL 1 MISFIRE P0

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