2006 INFINITI QX56 wiring

EC-2Revision: November 20092006 QX56
Description ...........................................................
.144
Diagnostic Procedure .......................................... .144
POWER SUPPLY AND GROUND CIRCUIT .......... .145
Wiring Diagram .................................................... .145
Diagnostic Procedure .......................................... .146
Ground Inspection ............................................... .150
DTC U1000, U1001 CAN COMMUNICATION LINE .151
Description ........................................................... .151
On Board Diagnosis Logic ................................... .151
DTC Confirmation Procedure .............................. .151
Wiring Diagram .................................................... .152
Diagnostic Procedure .......................................... .153
DTC U1010 CAN COMMUNICATION .................... .154
Description ........................................................... .154
On Board Diagnosis Logic ................................... .154
DTC Confirmation Procedure .............................. .154
Diagnostic Procedure .......................................... .155
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1
HEATER ................................................................. .156
Description ........................................................... .156
CONSULT-II Reference Value in Data Monitor Mode .156
On Board Diagnosis Logic ................................... .156
DTC Confirmation Procedure .............................. .156
Wiring Diagram .................................................... .157
Diagnostic Procedure .......................................... .160
Component Inspection ......................................... .162
Removal and Installation ..................................... .162
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER .163
Description ........................................................... .163
CONSULT-II Reference Value in Data Monitor Mode .163
On Board Diagnosis Logic ................................... .163
DTC Confirmation Procedure .............................. .164
Wiring Diagram .................................................... .165
Diagnostic Procedure .......................................... .168
Component Inspection ......................................... .170
Removal and Installation ..................................... .170
DTC P0101 MAF SENSOR .................................... .171
Component Description ....................................... .171
CONSULT-II Reference Value in Data Monitor Mode .171
On Board Diagnosis Logic ................................... .171
DTC Confirmation Procedure .............................. .172
Overall Function Check ....................................... .173
Wiring Diagram .................................................... .174
Diagnostic Procedure .......................................... .175
Component Inspection ......................................... .178
Removal and Installation ..................................... .179
DTC P0102, P0103 MAF SENSOR ........................ .180
Component Description ....................................... .180
CONSULT-II Reference Value in Data Monitor Mode .180
On Board Diagnosis Logic ................................... .180
DTC Confirmation Procedure .............................. .181
Wiring Diagram .................................................... .182
Diagnostic Procedure .......................................... .183
Component Inspection ......................................... .186
Removal and Installation ..................................... .187DTC P0112, P0113 IAT SENSOR ...........................
.188
Component Description ....................................... .188
On Board Diagnosis Logic ................................... .188
DTC Confirmation Procedure ............................... .188
Wiring Diagram .................................................... .189
Diagnostic Procedure ........................................... .190
Component Inspection ......................................... .191
Removal and Installation ...................................... .191
DTC P0117, P0118 ECT SENSOR ......................... .192
Component Description ....................................... .192
On Board Diagnosis Logic ................................... .192
DTC Confirmation Procedure ............................... .193
Wiring Diagram .................................................... .194
Diagnostic Procedure ........................................... .195
Component Inspection ......................................... .196
Removal and Installation ...................................... .197
DTC P0122, P0123 TP SENSOR ........................... .198
Component Description ....................................... .198
CONSULT-II Reference Value in Data Monitor Mode .198
On Board Diagnosis Logic ................................... .198
DTC Confirmation Procedure ............................... .199
Wiring Diagram .................................................... .200
Diagnostic Procedure ........................................... .201
Component Inspection ......................................... .204
Removal and Installation ...................................... .204
DTC P0125 ECT SENSOR ..................................... .205
Component Description ....................................... .205
On Board Diagnosis Logic ................................... .205
DTC Confirmation Procedure ............................... .206
Diagnostic Procedure ........................................... .206
Component Inspection ......................................... .207
Removal and Installation ...................................... .207
DTC P0127 IAT SENSOR ....................................... .208
Component Description ....................................... .208
On Board Diagnosis Logic ................................... .208
DTC Confirmation Procedure ............................... .208
Diagnostic Procedure ........................................... .209
Component Inspection ......................................... .210
Removal and Installation ...................................... .210
DTC P0128 THERMOSTAT FUNCTION ................ .211
On Board Diagnosis Logic ................................... .211
DTC Confirmation Procedure ............................... .211
Diagnostic Procedure ........................................... .211
Component Inspection ......................................... .212
Removal and Installation ...................................... .212
DTC P0130, P0150 A/F SENSOR 1 ....................... .213
Component Description ....................................... .213
CONSULT-II Reference Value in Data Monitor Mode .213
On Board Diagnosis Logic ................................... .213
DTC Confirmation Procedure ............................... .213
Overall Function Check ........................................ .214
Wiring Diagram .................................................... .216
Diagnostic Procedure ........................................... .219
Removal and Installation ...................................... .222
DTC P0131, P0151 A/F SENSOR 1 ....................... .223
Component Description ....................................... .223
CONSULT-II Reference Value in Data Monitor Mode

EC-3
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. 223
On Board Diagnosis Logic .................................. . 223
DTC Confirmation Procedure .............................. . 223
Wiring Diagram ................................................... . 225
Diagnostic Procedure .......................................... . 228
Removal and Installation ..................................... . 231
DTC P0132, P0152 A/F SENSOR 1 ...................... . 232
Component Description ....................................... . 232
CONSULT-II Reference Value in Data Monitor Mode . 232
On Board Diagnosis Logic .................................. . 232
DTC Confirmation Procedure .............................. . 232
Wiring Diagram ................................................... . 234
Diagnostic Procedure .......................................... . 237
Removal and Installation ..................................... . 240
DTC P0133, P0153 A/F SENSOR 1 ...................... . 241
Component Description ....................................... . 241
CONSULT-II Reference Value in Data Monitor Mode . 241
On Board Diagnosis Logic .................................. . 241
DTC Confirmation Procedure .............................. . 242
Wiring Diagram ................................................... . 244
Diagnostic Procedure .......................................... . 247
Removal and Installation ..................................... . 252
DTC P0137, P0157 HO2S2 ................................... . 253
Component Description ....................................... . 253
CONSULT-II Reference Value in Data Monitor Mode . 253
On Board Diagnosis Logic .................................. . 253
DTC Confirmation Procedure .............................. . 254
Overall Function Check ....................................... . 254
Wiring Diagram ................................................... . 256
Diagnostic Procedure .......................................... . 259
Component Inspection ........................................ . 262
Removal and Installation ..................................... . 263
DTC P0138, P0158 HO2S2 ................................... . 264
Component Description ....................................... . 264
CONSULT-II Reference Value in Data Monitor Mode . 264
On Board Diagnosis Logic .................................. . 264
DTC Confirmation Procedure .............................. . 265
Overall Function Check ....................................... . 266
Wiring Diagram ................................................... . 267
Diagnostic Procedure .......................................... . 270
Component Inspection ........................................ . 275
Removal and Installation ..................................... . 276
DTC P0139, P0159 HO2S2 ................................... . 277
Component Description ....................................... . 277
CONSULT-II Reference Value in Data Monitor Mode . 277
On Board Diagnosis Logic .................................. . 277
DTC Confirmation Procedure .............................. . 278
Overall Function Check ....................................... . 278
Wiring Diagram ................................................... . 280
Diagnostic Procedure .......................................... . 283
Component Inspection ........................................ . 286
Removal and Installation ..................................... . 287
DTC P0171, P0174 FUEL INJECTION SYSTEM
FUNCTION ............................................................. . 288On Board Diagnosis Logic ...................................
.288
DTC Confirmation Procedure .............................. .288
Wiring Diagram .................................................... .290
Diagnostic Procedure .......................................... .294
DTC P0172, P0175 FUEL INJECTION SYSTEM
FUNCTION ............................................................. .299
On Board Diagnosis Logic ................................... .299
DTC Confirmation Procedure .............................. .299
Wiring Diagram .................................................... .301
Diagnostic Procedure .......................................... .305
DTC P0181 FTT SENSOR ..................................... .309
Component Description ....................................... .309
On Board Diagnosis Logic ................................... .309
DTC Confirmation Procedure .............................. .309
Wiring Diagram .................................................... .311
Diagnostic Procedure .......................................... .312
Component Inspection ......................................... .314
Removal and Installation ..................................... .314
DTC P0182, P0183 FTT SENSOR ......................... .315
Component Description ....................................... .315
On Board Diagnosis Logic ................................... .315
DTC Confirmation Procedure .............................. .315
Wiring Diagram .................................................... .316
Diagnostic Procedure .......................................... .317
Component Inspection ......................................... .319
Removal and Installation ..................................... .319
DTC P0222, P0223 TP SENSOR ........................... .320
Component Description ....................................... .320
CONSULT-II Reference Value in Data Monitor Mode .320
On Board Diagnosis Logic ................................... .320
DTC Confirmation Procedure .............................. .321
Wiring Diagram .................................................... .322
Diagnostic Procedure .......................................... .323
Component Inspection ......................................... .326
Removal and Installation ..................................... .326
DTC P0300 - P0308 MULTIPLE CYLINDER MIS-
FIRE, NO. 1 - 8 CYLINDER MISFIRE .................... .327
On Board Diagnosis Logic ................................... .327
DTC Confirmation Procedure .............................. .327
Diagnostic Procedure .......................................... .328
DTC P0327, P0328, P0332, P0333 KS .................. .335
Component Description ....................................... .335
On Board Diagnosis Logic ................................... .335
DTC Confirmation Procedure .............................. .335
Wiring Diagram .................................................... .336
Diagnostic Procedure .......................................... .337
Component Inspection ......................................... .339
Removal and Installation ..................................... .339
DTC P0335 CKP SENSOR (POS) ......................... .340
Component Description ....................................... .340
CONSULT-II Reference Value in Data Monitor Mode .340
On Board Diagnosis Logic ................................... .340
DTC Confirmation Procedure .............................. .340
Wiring Diagram .................................................... .342
Diagnostic Procedure .......................................... .343
Component Inspection ......................................... .346
Removal and Installation ..................................... .346

EC-4Revision: November 20092006 QX56
DTC P0340 CMP SENSOR (PHASE) ....................
.347
Component Description ....................................... .347
On Board Diagnosis Logic ................................... .347
DTC Confirmation Procedure .............................. .347
Wiring Diagram .................................................... .349
Diagnostic Procedure .......................................... .350
Component Inspection ......................................... .353
Removal and Installation ..................................... .353
DTC P0420, P0430 THREE WAY CATALYST FUNC-
TION ....................................................................... .354
On Board Diagnosis Logic ................................... .354
DTC Confirmation Procedure .............................. .354
Overall Function Check ....................................... .355
Diagnostic Procedure .......................................... .356
DTC P0441 EVAP CONTROL SYSTEM ................ .360
System Description .............................................. .360
On Board Diagnosis Logic ................................... .360
DTC Confirmation Procedure .............................. .360
Overall Function Check ....................................... .361
Diagnostic Procedure .......................................... .362
DTC P0442 EVAP CONTROL SYSTEM ................ .365
On Board Diagnosis Logic ................................... .365
DTC Confirmation Procedure .............................. .366
Diagnostic Procedure .......................................... .367
DTC P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE .............................. .373
Description ........................................................... .373
CONSULT-II Reference Value in Data Monitor Mode .373
On Board Diagnosis Logic ................................... .374
DTC Confirmation Procedure .............................. .374
Wiring Diagram .................................................... .375
Diagnostic Procedure .......................................... .377
Component Inspection ......................................... .380
Removal and Installation ..................................... .380
DTC P0444, P0445 EVAP CANISTER PURGE VOL-
UME CONTROL SOLENOID VALVE ..................... .381
Description ........................................................... .381
CONSULT-II Reference Value in Data Monitor Mode .381
On Board Diagnosis Logic ................................... .382
DTC Confirmation Procedure .............................. .382
Wiring Diagram .................................................... .383
Diagnostic Procedure .......................................... .385
Component Inspection ......................................... .386
Removal and Installation ..................................... .387
DTC P0447 EVAP CANISTER VENT CONTROL
VALVE .................................................................... .388
Component Description ....................................... .388
CONSULT-II Reference Value in Data Monitor Mode .388
On Board Diagnosis Logic ................................... .388
DTC Confirmation Procedure .............................. .389
Wiring Diagram .................................................... .390
Diagnostic Procedure .......................................... .391
Component Inspection ......................................... .393
DTC P0448 EVAP CANISTER VENT CONTROL
VALVE .................................................................... .395
Component Description ....................................... .395CONSULT-II Reference Value in Data Monitor Mode
.395
On Board Diagnosis Logic ................................... .395
DTC Confirmation Procedure ............................... .396
Wiring Diagram .................................................... .397
Diagnostic Procedure ........................................... .398
Component Inspection ......................................... .400
DTC P0451 EVAP CONTROL SYSTEM PRESSURE
SENSOR ................................................................. .402
Component Description ....................................... .402
CONSULT-II Reference Value in Data Monitor Mode .402
On Board Diagnosis Logic ................................... .402
DTC Confirmation Procedure ............................... .403
Diagnostic Procedure ........................................... .403
Component Inspection ......................................... .404
DTC P0452 EVAP CONTROL SYSTEM PRESSURE
SENSOR ................................................................. .405
Component Description ....................................... .405
CONSULT-II Reference Value in Data Monitor Mode .405
On Board Diagnosis Logic ................................... .405
DTC Confirmation Procedure ............................... .406
Wiring Diagram .................................................... .407
Diagnostic Procedure ........................................... .408
Component Inspection ......................................... .410
DTC P0453 EVAP CONTROL SYSTEM PRESSURE
SENSOR ................................................................. .411
Component Description ....................................... .411
CONSULT-II Reference Value in Data Monitor Mode .411
On Board Diagnosis Logic ................................... .411
DTC Confirmation Procedure ............................... .412
Wiring Diagram .................................................... .413
Diagnostic Procedure ........................................... .414
Component Inspection ......................................... .418
DTC P0455 EVAP CONTROL SYSTEM ................ .419
On Board Diagnosis Logic ................................... .419
DTC Confirmation Procedure ............................... .420
Diagnostic Procedure ........................................... .421
DTC P0456 EVAP CONTROL SYSTEM ................ .427
On Board Diagnosis Logic ................................... .427
DTC Confirmation Procedure ............................... .428
Overall Function Check ........................................ .429
Diagnostic Procedure ........................................... .430
DTC P0460 FUEL LEVEL SENSOR ...................... .436
Component Description ....................................... .436
On Board Diagnosis Logic ................................... .436
DTC Confirmation Procedure ............................... .436
Diagnostic Procedure ........................................... .437
Removal and Installation ...................................... .437
DTC P0461 FUEL LEVEL SENSOR ...................... .438
Component Description ....................................... .438
On Board Diagnosis Logic ................................... .438
Overall Function Check ........................................ .438
Diagnostic Procedure ........................................... .439
Removal and Installation ...................................... .439
DTC P0462, P0463 FUEL LEVEL SENSOR CIR-
CUIT ........................................................................ .440

EC-5
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Component Description .......................................
. 440
On Board Diagnosis Logic .................................. . 440
DTC Confirmation Procedure .............................. . 440
Diagnostic Procedure .......................................... . 441
Removal and Installation ..................................... . 441
DTC P0500 VSS .................................................... . 442
Description .......................................................... . 442
On Board Diagnosis Logic .................................. . 442
DTC Confirmation Procedure .............................. . 442
Overall Function Check ....................................... . 442
Diagnostic Procedure .......................................... . 443
DTC P0506 ISC SYSTEM ...................................... . 444
Description .......................................................... . 444
On Board Diagnosis Logic .................................. . 444
DTC Confirmation Procedure .............................. . 444
Diagnostic Procedure .......................................... . 445
DTC P0507 ISC SYSTEM ...................................... . 446
Description .......................................................... . 446
On Board Diagnosis Logic .................................. . 446
DTC Confirmation Procedure .............................. . 446
Diagnostic Procedure .......................................... . 447
DTC P0550 PSP SENSOR .................................... . 448
Component Description ....................................... . 448
CONSULT-II Reference Value in Data Monitor Mode . 448
On Board Diagnosis Logic .................................. . 448
DTC Confirmation Procedure .............................. . 448
Wiring Diagram ................................................... . 449
Diagnostic Procedure .......................................... . 450
Component Inspection ........................................ . 452
Removal and Installation ..................................... . 452
DTC P0603 ECM POWER SUPPLY ...................... . 453
Component Description ....................................... . 453
On Board Diagnosis Logic .................................. . 453
DTC Confirmation Procedure .............................. . 453
Wiring Diagram ................................................... . 454
Diagnostic Procedure .......................................... . 455
DTC P0605 ECM ................................................... . 457
Component Description ....................................... . 457
On Board Diagnosis Logic .................................. . 457
DTC Confirmation Procedure .............................. . 457
Diagnostic Procedure .......................................... . 458
DTC P0643 SENSOR POWER SUPPLY ............... . 460
On Board Diagnosis Logic .................................. . 460
DTC Confirmation Procedure .............................. . 460
Wiring Diagram ................................................... . 461
Diagnostic Procedure .......................................... . 463
DTC P0850 PNP SWITCH ..................................... . 465
Component Description ....................................... . 465
CONSULT-II Reference Value in Data Monitor Mode . 465
On Board Diagnosis Logic .................................. . 465
DTC Confirmation Procedure .............................. . 465
Overall Function Check ....................................... . 466
Wiring Diagram ................................................... . 467
Diagnostic Procedure .......................................... . 468
DTC P1148, P1168 CLOSED LOOP CONTROL ... . 470
On Board Diagnosis Logic .................................. . 470
DTC P1211 TCS CONTROL UNIT ........................ . 471Description ...........................................................
.471
On Board Diagnosis Logic ................................... .471
DTC Confirmation Procedure .............................. .471
Diagnostic Procedure .......................................... .471
DTC P1212 TCS COMMUNICATION LINE ........... .472
Description ........................................................... .472
On Board Diagnosis Logic ................................... .472
DTC Confirmation Procedure .............................. .472
Diagnostic Procedure .......................................... .472
DTC P1217 ENGINE OVER TEMPERATURE ....... .473
Description ........................................................... .473
CONSULT-II Reference Value in Data Monitor Mode .473
On Board Diagnosis Logic ................................... .474
Overall Function Check ....................................... .474
Wiring Diagram .................................................... .476
Diagnostic Procedure .......................................... .478
Main 12 Causes of Overheating .......................... .481
Component Inspection ......................................... .482
DTC P1225 TP SENSOR ....................................... .483
Component Description ....................................... .483
On Board Diagnosis Logic ................................... .483
DTC Confirmation Procedure .............................. .483
Diagnostic Procedure .......................................... .484
Removal and Installation ..................................... .484
DTC P1226 TP SENSOR ....................................... .485
Component Description ....................................... .485
On Board Diagnosis Logic ................................... .485
DTC Confirmation Procedure .............................. .485
Diagnostic Procedure .......................................... .486
Removal and Installation ..................................... .486
DTC P1564 ICC STEERING SWITCH ................... .487
Component Description ....................................... .487
CONSULT-II Reference Value in Data Monitor Mode .487
On Board Diagnosis Logic ................................... .487
DTC Confirmation Procedure .............................. .488
Wiring Diagram .................................................... .489
Diagnostic Procedure .......................................... .490
Component Inspection ......................................... .493
DTC P1564 ASCD STEERING SWITCH ............... .494
Component Description ....................................... .494
CONSULT-II Reference Value in Data Monitor Mode .494
On Board Diagnosis Logic ................................... .494
DTC Confirmation Procedure .............................. .495
Wiring Diagram .................................................... .496
Diagnostic Procedure .......................................... .497
Component Inspection ......................................... .500
DTC P1568 ICC FUNCTION .................................. .501
On Board Diagnosis Logic ................................... .501
DTC Confirmation Procedure .............................. .501
Diagnostic Procedure .......................................... .501
DTC P1572 ICC BRAKE SWITCH ......................... .502
Component Description ....................................... .502
CONSULT-II Reference Value in Data Monitor Mode .502
On Board Diagnosis Logic ................................... .502
DTC Confirmation Procedure .............................. .503

EC-6Revision: November 20092006 QX56
Wiring Diagram ....................................................
.504
Diagnostic Procedure .......................................... .505
Component Inspection ......................................... .509
DTC P1572 ASCD BRAKE SWITCH ..................... .511
Component Description ....................................... .511
CONSULT-II Reference Value in Data Monitor Mode .511
On Board Diagnosis Logic ................................... .511
DTC confirmation Procedure ............................... .512
Wiring Diagram .................................................... .513
Diagnostic Procedure .......................................... .514
Component Inspection ......................................... .518
DTC P1574 ICC VEHICLE SPEED SENSOR ........ .519
Component Description ....................................... .519
On Board Diagnosis Logic ................................... .519
DTC Confirmation Procedure .............................. .519
Diagnostic Procedure .......................................... .520
DTC P1574 ASCD VEHICLE SPEED SENSOR .... .521
Component Description ....................................... .521
On Board Diagnosis Logic ................................... .521
DTC Confirmation Procedure .............................. .521
Diagnostic Procedure .......................................... .522
DTC P1805 BRAKE SWITCH ................................ .523
Description ........................................................... .523
CONSULT-II Reference Value in Data Monitor Mode .523
On Board Diagnosis Logic ................................... .523
DTC Confirmation Procedure .............................. .523
Wiring Diagram .................................................... .524
Diagnostic Procedure .......................................... .525
Component Inspection ......................................... .527
DTC P2100, P2103 THROTTLE CONTROL MOTOR
RELAY .................................................................... .528
Component Description ....................................... .528
CONSULT-II Reference Value in Data Monitor Mode .528
On Board Diagnosis Logic ................................... .528
DTC Confirmation Procedure .............................. .528
Wiring Diagram .................................................... .530
Diagnostic Procedure .......................................... .531
DTC P2101 ELECTRIC THROTTLE CONTROL
FUNCTION ............................................................. .534
Description ........................................................... .534
On Board Diagnosis Logic ................................... .534
DTC Confirmation Procedure .............................. .534
Wiring Diagram .................................................... .535
Diagnostic Procedure .......................................... .536
Component Inspection ......................................... .539
Removal and Installation ..................................... .539
DTC P2118 THROTTLE CONTROL MOTOR ........ .540
Component Description ....................................... .540
On Board Diagnosis Logic ................................... .540
DTC Confirmation Procedure .............................. .540
Wiring Diagram .................................................... .541
Diagnostic Procedure .......................................... .542
Component Inspection ......................................... .543
Removal and Installation ..................................... .544
DTC P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR ............................................................ .545Component Description .......................................
.545
On Board Diagnosis Logic ................................... .545
DTC Confirmation Procedure ............................... .545
Diagnostic Procedure ........................................... .546
DTC P2122, P2123 APP SENSOR ........................ .547
Component Description ....................................... .547
CONSULT-II Reference Value in Data Monitor Mode .547
On Board Diagnosis Logic ................................... .547
DTC Confirmation Procedure ............................... .548
Wiring Diagram .................................................... .549
Diagnostic Procedure ........................................... .550
Component Inspection ......................................... .552
Removal and Installation ...................................... .552
DTC P2127, P2128 APP SENSOR ........................ .553
Component Description ....................................... .553
CONSULT-II Reference Value in Data Monitor Mode .553
On Board Diagnosis Logic ................................... .553
DTC Confirmation Procedure ............................... .554
Wiring Diagram .................................................... .555
Diagnostic Procedure ........................................... .556
Component Inspection ......................................... .559
Removal and Installation ...................................... .559
DTC P2135 TP SENSOR ....................................... .560
Component Description ....................................... .560
CONSULT-II Reference Value in Data Monitor Mode .560
On Board Diagnosis Logic ................................... .560
DTC Confirmation Procedure ............................... .561
Wiring Diagram .................................................... .562
Diagnostic Procedure ........................................... .563
Component Inspection ......................................... .566
Removal and Installation ...................................... .566
DTC P2138 APP SENSOR ..................................... .567
Component Description ....................................... .567
CONSULT-II Reference Value in Data Monitor Mode .567
On Board Diagnosis Logic ................................... .567
DTC Confirmation Procedure ............................... .568
Wiring Diagram .................................................... .569
Diagnostic Procedure ........................................... .570
Component Inspection ......................................... .574
Removal and Installation ...................................... .574
DTC P2A00, P2A03 A/F SENSOR 1 ...................... .575
Component Description ....................................... .575
CONSULT-II Reference Value in Data Monitor Mode .575
On Board Diagnosis Logic ................................... .575
DTC Confirmation Procedure ............................... .575
Wiring Diagram .................................................... .577
Diagnostic Procedure ........................................... .580
Removal and Installation ...................................... .585
ASCD BRAKE SWITCH ......................................... .586
Component Description ....................................... .586
CONSULT-II Reference Value in Data Monitor Mode .586
Wiring Diagram .................................................... .587

EC-7
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Diagnostic Procedure ..........................................
. 588
Component Inspection ........................................ . 592
ASCD INDICATOR ................................................ . 593
Component Description ....................................... . 593
CONSULT-II Reference Value in Data Monitor Mode . 593
Wiring Diagram ................................................... . 594
Diagnostic Procedure .......................................... . 595
ELECTRICAL LOAD SIGNAL ............................... . 596
Description .......................................................... . 596
CONSULT-II Reference Value in Data Monitor Mode . 596
Diagnostic Procedure .......................................... . 596
FUEL INJECTOR ................................................... . 598
Component Description ....................................... . 598
CONSULT-II Reference Value in Data Monitor Mode . 598
Wiring Diagram ................................................... . 599
Diagnostic Procedure .......................................... . 600
Component Inspection ........................................ . 603
Removal and Installation ..................................... . 603
FUEL PUMP .......................................................... . 604
Description .......................................................... . 604
CONSULT-II Reference Value in Data Monitor Mode . 604
Wiring Diagram ................................................... . 605
Diagnostic Procedure .......................................... . 606
Component Inspection ........................................ . 609
Removal and Installation ..................................... . 609
ICC BRAKE SWITCH ............................................ . 610
Component Description ....................................... . 610
CONSULT-II Reference Value in Data Monitor Mode .610
Wiring Diagram .................................................... .611
Diagnostic Procedure .......................................... .612
Component Inspection ......................................... .617
IGNITION SIGNAL ................................................. .618
Component Description ....................................... .618
Wiring Diagram .................................................... .619
Diagnostic Procedure .......................................... .624
Component Inspection ......................................... .628
Removal and Installation ..................................... .629
REFRIGERANT PRESSURE SENSOR ................. .630
Component Description ....................................... .630
Wiring Diagram .................................................... .631
Diagnostic Procedure .......................................... .632
Removal and Installation ..................................... .634
MIL AND DATA LINK CONNECTOR ..................... .635
Wiring Diagram .................................................... .635
SERVICE DATA AND SPECIFICATIONS (SDS) ... .637
Fuel Pressure ...................................................... .637
Idle Speed and Ignition Timing ............................ .637
Calculated Load Value ......................................... .637
Mass Air Flow Sensor .......................................... .637
Intake Air Temperature Sensor ............................ .637
Engine Coolant Temperature Sensor .................. .637
A/F Sensor 1 Heater ............................................ .637
Heated Oxygen sensor 2 Heater ......................... .637
Crankshaft Position Sensor (POS) ...................... .637
Camshaft Position Sensor (PHASE) ................... .637
Throttle Control Motor .......................................... .637
Fuel Injector ......................................................... .638
Fuel Pump ........................................................... .638

EC-16Revision: November 2009
PRECAUTIONS
2006 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UBS00KZ0
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER ”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The 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 necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
On Board Diagnostic (OBD) System of Engine and A/TUBS00KZ1
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:

Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any
repair or inspection work. The open/short circuit of related switches, 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 components, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-68, "
HAR-
NESS CONNECTOR" .

Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MIL to light up due to the short circuit.

Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the EVAP system or fuel injection system,
etc.

Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PrecautionUBS00KZ2

Always use a 12 volt battery as power source.

Do not attempt to disconnect battery cables while engine is
running.

Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery cable. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned OFF.

Before removing parts, turn ignition switch OFF and then
disconnect negative battery cable.
SEF289H

CAN COMMUNICATIONEC-31
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Revision: November 2009 2006 QX56
CAN COMMUNICATIONPFP:23710
System DescriptionUBS00KZE
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to LAN-26, "
CAN COMMUNICATION" , about CAN communication for detail.