sensor INFINITI QX56 2009 Factory Service Manual

DLN-236
< PRECAUTION >[REAR FINAL DRIVE: R230]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005877756
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty 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 w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
 To avoid rendering the SRS inopera tive, 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 performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
 When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005877757
NOTE:
 This Procedure is applied only to models with Intelli gent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
 Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
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CONTENTS
ENGINE CONTROL SYSTEM
VK56DE
BASIC INSPECTION ....... .............................
8
DIAGNOSIS AND REPAIR WORKFLOW ..... .....8
Trouble Diagnosis Introduction ........................... ......8
INSPECTION AND ADJUSTMENT ....................13
Basic Inspection .................................................. ....13
Idle Speed and Ignition Timing Check ....................17
Procedure After Replacing ECM .............................17
VIN Registration ......................................................17
Accelerator Pedal Released Position Learning .......18
Throttle Valve Closed Position Learning .................18
Idle Air Volume Learning .........................................18
FUNCTION DIAGNOSIS ..............................21
ENGINE CONTROL SYSTEM ........................ ....21
System Diagram .................................................. ....21
Engine Control Component Parts Location .............22
MULTIPORT FUEL INJECTION SYSTEM .........28
System Description ............................................. ....28
ELECTRIC IGNITION SYSTEM ..................... ....31
System Description ............................................. ....31
AIR CONDITIONING CUT CONTROL ...............32
Input/Output Signal Chart .................................... ....32
System Description .................................................32
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ...............................................................
33
System Description ............................................. ....33
Component Description ...........................................34
CAN COMMUNICATION ....................................35
System Description ............................................. ....35
COOLING FAN CONTROL ................................36
Description .......................................................... ....36
EVAPORATIVE EMISSION SYSTEM ...............37
Description ........................................................... ....37
INTAKE VALVE TIMING CONTROL ................40
Description ...............................................................40
ON BOARD DIAGNOSTIC (OBD) SYSTEM ....41
Introduction ..............................................................41
Two Trip Detection Logic .........................................41
Emission-related Diagnostic Information .................42
Malfunction Indicator Lamp (MIL) ............................55
OBD System Operation Chart .................................58
CONSULT-III Function (ENGINE) ...........................63
Generic Scan Tool (GST) Function .........................72
COMPONENT DIAGNOSIS .........................74
TROUBLE DIAGNOSIS - SPECIFICATION
VALUE ...............................................................
74
Description ........................................................... ....74
Testing Condition .....................................................74
Inspection Procedure ...............................................74
Diagnosis Procedure ...............................................75
POWER SUPPLY AND GROUND CIRCUIT ....82
Diagnosis Procedure ...............................................82
Ground Inspection ...................................................85
U1000, U1001 CAN COMM CIRCUIT ...............86
Description ...............................................................86
On Board Diagnosis Logic .......................................86
DTC Confirmation Procedure ..................................86
Diagnosis Procedure ...............................................86
P0011, P0021 IVT CONTROL ...........................87
On Board Diagnosis Logic .......................................87
DTC Confirmation Procedure ..................................87
Diagnosis Procedure ...............................................88
Component Inspection .............................................92
P0031, P0032, P0051, P0052 A/F SENSOR 1
HEATER ............................................................
94
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Description ..............................................................94
On Board Diagnosis Logic ......................................94
DTC Confirmation Procedure .................................94
Diagnosis Procedure ..............................................94
Component Inspection ............................................96
P0037, P0038, P0057, P0058 HO2S2 HEAT-
ER ......................................................................
97
Description ........................................................... ...97
On Board Diagnosis Logic ......................................97
DTC Confirmation Procedure .................................97
Diagnosis Procedure ..............................................98
Component Inspection ............................................99
P0075, P0081 IVT CONTROL SOLENOID
VALVE .............................................................
100
Component Description ....................................... ..100
On Board Diagnosis Logic .....................................100
DTC Confirmation Procedure ................................100
Diagnosis Procedure .............................................100
Component Inspection ...........................................101
P0101 MAF SENSOR ......................................103
Component Description ....................................... ..103
On Board Diagnosis Logic .....................................103
DTC Confirmation Procedure ................................103
Overall Function Check .........................................104
Diagnosis Procedure .............................................105
Component Inspection ...........................................107
P0102, P0103 MAF SENSOR ..........................109
Component Description ....................................... ..109
On Board Diagnosis Logic .....................................109
DTC Confirmation Procedure ................................109
Diagnosis Procedure .............................................110
Component Inspection ...........................................111
P0112, P0113 IAT SENSOR ............................114
Component Description ....................................... ..114
On Board Diagnosis Logic .....................................114
DTC Confirmation Procedure ................................114
Diagnosis Procedure .............................................114
Component Inspection ...........................................116
P0116 ECT SENSOR .......................................117
Component Description ....................................... ..117
On Board Diagnosis Logic .....................................117
DTC Confirmation Procedure ................................117
Diagnosis Procedure .............................................118
Component Inspection ...........................................118
P0117, P0118 ECT SENSOR ..........................120
Component Description ....................................... ..120
On Board Diagnosis Logic .....................................120
DTC Confirmation Procedure ................................121
Diagnosis Procedure .............................................121
Component Inspection ...........................................122
P0122, P0123 TP SENSOR .............................124
Component Description ....................................... ..124
On Board Diagnosis Logic .....................................124
DTC Confirmation Procedure ............................... .124
Diagnosis Procedure .............................................124
Component Inspection ..........................................127
P0125 ECT SENSOR .......................................128
Component Description ....................................... .128
On Board Diagnosis Logic ....................................128
DTC Confirmation Procedure ................................128
Diagnosis Procedure .............................................129
Component Inspection ..........................................129
P0127 IAT SENSOR .........................................131
Component Description ....................................... .131
On Board Diagnosis Logic ....................................131
DTC Confirmation Procedure ................................131
Diagnosis Procedure .............................................132
Component Inspection ..........................................132
P0128 THERMOSTAT FUNCTION ..................134
On Board Diagnosis Logic ................................... .134
DTC Confirmation Procedure ................................134
Diagnosis Procedure .............................................134
Component Inspection ..........................................134
P0130, P0150 A/F SENSOR 1 .........................136
Component Description ....................................... .136
On Board Diagnosis Logic ....................................136
DTC Confirmation Procedure ................................136
Overall Function Check .........................................137
Diagnosis Procedure .............................................137
P0131, P0151 A/F SENSOR 1 .........................140
Component Description ....................................... .140
On Board Diagnosis Logic ....................................140
DTC Confirmation Procedure ................................140
Diagnosis Procedure .............................................141
P0132, P0152 A/F SENSOR 1 .........................143
Component Description ....................................... .143
On Board Diagnosis Logic ....................................143
DTC Confirmation Procedure ................................143
Diagnosis Procedure .............................................144
P0133, P0153 A/F SENSOR 1 .........................146
Component Description ....................................... .146
On Board Diagnosis Logic ....................................146
DTC Confirmation Procedure ................................146
Diagnosis Procedure .............................................147
P0137, P0157 HO2S2 .......................................152
Component Description ....................................... .152
On Board Diagnosis Logic ....................................152
DTC Confirmation Procedure ................................152
Overall Function Check .........................................153
Diagnosis Procedure .............................................153
Component Inspection ..........................................155
P0138, P0158 HO2S2 .......................................157
Component Description ....................................... .157
On Board Diagnosis Logic ....................................157
DTC Confirmation Procedure ................................157
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Overall Function Check .......................................
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158
Diagnosis Procedure .............................................159
Component Inspection ..........................................162
P0139, P0159 HO2S2 ......................................164
Component Description ....................................... ..164
On Board Diagnosis Logic ....................................164
DTC Confirmation Procedure ................................164
Overall Function Check .........................................165
Diagnosis Procedure .............................................165
Component Inspection ..........................................167
P0171, P0174 FUEL INJECTION SYSTEM
FUNCTION .......................................................
169
On Board Diagnosis Logic .................................. ..169
DTC Confirmation Procedure ................................169
Diagnosis Procedure .............................................170
P0172, P0175 FUEL INJECTION SYSTEM
FUNCTION .......................................................
174
On Board Diagnosis Logic .................................. ..174
DTC Confirmation Procedure ................................174
Diagnosis Procedure .............................................175
P0181 FTT SENSOR ........................................179
Component Description ....................................... ..179
On Board Diagnosis Logic ....................................179
DTC Confirmation Procedure ................................179
Diagnosis Procedure .............................................180
Component Inspection ..........................................181
P0182, P0183 FTT SENSOR ...........................182
Component Description ....................................... ..182
On Board Diagnosis Logic ....................................182
DTC Confirmation Procedure ................................182
Diagnosis Procedure .............................................182
Component Inspection ..........................................184
P0222, P0223 APP SENSOR ...........................185
Component Description ....................................... ..185
On Board Diagnosis Logic ....................................185
DTC Confirmation Procedure ................................185
Diagnosis Procedure .............................................185
Component Inspection ..........................................188
P0300, P0301, P0302, P0303, P0304, P0305,
P0306, P0307, P0308 MISFIRE .......................
189
On Board Diagnosis Logic .................................. ..189
DTC Confirmation Procedure ................................189
Diagnosis Procedure .............................................190
P0327, P0328, P0332, P0333 KS ....................195
Component Description ....................................... ..195
On Board Diagnosis Logic ....................................195
DTC Confirmation Procedure ................................195
Diagnosis Procedure .............................................195
Component Inspection ..........................................197
P0335 CKP SENSOR (POS) ............................198
Component Description ....................................... ..198
On Board Diagnosis Logic ....................................198
DTC Confirmation Procedure .............................. ..198
Diagnosis Procedure .............................................199
Component Inspection ...........................................200
P0340 CMP SENSOR (PHASE) .....................202
Component Description .........................................202
On Board Diagnosis Logic .....................................202
DTC Confirmation Procedure ................................202
Diagnosis Procedure .............................................203
Component Inspection ...........................................204
P0420, P0430 THREE WAY CATALYST
FUNCTION ......................................................
206
On Board Diagnosis Logic ................................... ..206
DTC Confirmation Procedure ................................206
Overall Function Check .........................................207
Diagnosis Procedure .............................................207
P0441 EVAP CONTROL SYSTEM .................210
System Description ................................................210
On Board Diagnosis Logic .....................................210
DTC Confirmation Procedure ................................210
Overall Function Check .........................................211
Diagnosis Procedure .............................................211
P0442 EVAP CONTROL SYSTEM .................215
On Board Diagnosis Logic .....................................215
DTC Confirmation Procedure ................................215
Diagnosis Procedure .............................................216
Component Inspection ...........................................221
P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE ......................
222
Description .............................................................222
On Board Diagnosis Logic .....................................222
DTC Confirmation Procedure ................................222
Diagnosis Procedure .............................................223
Component Inspection ...........................................225
P0444, P0445 EVAP CANISTER PURGE
VOLUME CONTROL SOLENOID VALVE ......
227
Description .............................................................227
On Board Diagnosis Logic .....................................227
DTC Confirmation Procedure ................................228
Diagnosis Procedure .............................................228
Component Inspection ...........................................229
P0447 EVAP CANISTER VENT CONTROL
VALVE .............................................................
230
Component Description .........................................230
On Board Diagnosis Logic .....................................230
DTC Confirmation Procedure ................................230
Diagnosis Procedure .............................................230
Component Inspection ...........................................232
P0448 EVAP CANISTER VENT CONTROL
VALVE .............................................................
234
Component Description .........................................234
On Board Diagnosis Logic .....................................234
DTC Confirmation Procedure ................................234
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Diagnosis Procedure .............................................235
Component Inspection ...........................................236
P0451 EVAP CONTROL SYSTEM PRES-
SURE SENSOR ...............................................
238
Component Description ....................................... ..238
On Board Diagnosis Logic .....................................238
DTC Confirmation Procedure ................................238
Diagnosis Procedure .............................................238
Component Inspection ...........................................239
P0452 EVAP CONTROL SYSTEM PRES-
SURE SENSOR ...............................................
241
Component Description ....................................... ..241
On Board Diagnosis Logic .....................................241
DTC Confirmation Procedure ................................241
Diagnosis Procedure .............................................242
Component Inspection ...........................................244
P0453 EVAP CONTROL SYSTEM PRES-
SURE SENSOR ...............................................
245
Component Description ....................................... ..245
On Board Diagnosis Logic .....................................245
DTC Confirmation Procedure ................................245
Diagnosis Procedure .............................................246
Component Inspection ...........................................249
P0455 EVAP CONTROL SYSTEM ..................250
On Board Diagnosis Logic ................................... ..250
DTC Confirmation Procedure ................................250
Diagnosis Procedure .............................................251
Component Inspection ...........................................256
P0456 EVAP CONTROL SYSTEM ..................257
On Board Diagnosis Logic ................................... ..257
DTC Confirmation Procedure ................................258
Overall Function Check .........................................258
Diagnosis Procedure .............................................259
Component Inspection ...........................................264
P0460 FUEL LEVEL SENSOR ........................265
Component Description ....................................... ..265
On Board Diagnosis Logic .....................................265
DTC Confirmation Procedure ................................265
Diagnosis Procedure .............................................265
P0461 FUEL LEVEL SENSOR ........................267
Component Description ....................................... ..267
On Board Diagnosis Logic .....................................267
Overall Function Check .........................................267
Diagnosis Procedure .............................................268
P0462, P0463 FUEL LEVEL SENSOR ...........269
Component Description ....................................... ..269
On Board Diagnosis Logic .....................................269
DTC Confirmation Procedure ................................269
Diagnosis Procedure .............................................269
P0500 VSS .......................................................271
Description ........................................................... ..271
On Board Diagnosis Logic .....................................271
DTC Confirmation Procedure ............................... .271
Overall Function Check .........................................272
Diagnosis Procedure .............................................272
P0506 ISC SYSTEM .........................................273
Description ........................................................... .273
On Board Diagnosis Logic ....................................273
DTC Confirmation Procedure ................................273
Diagnosis Procedure .............................................273
P0507 ISC SYSTEM .........................................275
Description ........................................................... .275
On Board Diagnosis Logic ....................................275
DTC Confirmation Procedure ................................275
Diagnosis Procedure .............................................275
P0550 PSP SENSOR .......................................277
Component Description ....................................... .277
On Board Diagnosis Logic ....................................277
DTC Confirmation Procedure ................................277
Diagnosis Procedure .............................................277
Component Inspection ..........................................279
P0603 ECM POWER SUPPLY .........................280
Description ........................................................... .280
DTC Logic .............................................................280
Diagnosis Procedure .............................................280
P0605 ECM .......................................................282
Component Description ....................................... .282
On Board Diagnosis Logic ....................................282
DTC Confirmation Procedure ................................282
Diagnosis Procedure .............................................283
P0607 ECM .......................................................284
Description ........................................................... .284
On Board Diagnosis Logic ....................................284
DTC Confirmation Procedure ................................284
Diagnosis Procedure .............................................284
P0643 SENSOR POWER SUPPLY ..................285
On Board Diagnosis Logic ...................................
.285
DTC Confirmation Procedure ................................285
Diagnosis Procedure .............................................285
P0850 PNP SWITCH ........................................288
Component Description ....................................... .288
On Board Diagnosis Logic ....................................288
DTC Confirmation Procedure ................................288
Overall Function Check .........................................288
Diagnosis Procedure .............................................289
P1140, P1145 IVT CONTROL POSITION
SENSOR ...........................................................
291
Component Description ....................................... .291
On Board Diagnosis Logic ....................................291
DTC Confirmation Procedure ................................291
Diagnosis Procedure .............................................291
Component Inspection ..........................................294
P1148, P1168 CLOSED LOOP CONTROL .....295
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On Board Diagnosis Logic ..................................
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295
P1211 TCS CONTROL UNIT ...........................296
Description .......................................................... ..296
On Board Diagnosis Logic ....................................296
DTC Confirmation Procedure ................................296
Diagnosis Procedure .............................................296
P1212 TCS COMMUNICATION LINE ..............297
Description .......................................................... ..297
On Board Diagnosis Logic ....................................297
DTC Confirmation Procedure ................................297
Diagnosis Procedure .............................................297
P1217 ENGINE OVER TEMPERATURE .........298
On Board Diagnosis Logic .................................. ..298
Overall Function Check .........................................298
Diagnosis Procedure .............................................299
Main 13 Causes of Overheating ............................300
P1225 TP SENSOR ..........................................302
Component Description ....................................... ..302
On Board Diagnosis Logic ....................................302
DTC Confirmation Procedure ................................302
Diagnosis Procedure .............................................302
P1226 TP SENSOR ..........................................304
Component Description ....................................... ..304
On Board Diagnosis Logic ....................................304
DTC Confirmation Procedure ................................304
Diagnosis Procedure .............................................304
P1421 COLD START CONTROL .....................306
Description .......................................................... ..306
On Board Diagnosis Logic ....................................306
DTC Confirmation Procedure ................................306
Diagnosis Procedure .............................................306
P1550 BATTERY CURRENT SENSOR ...........308
Component Description ....................................... ..308
On Board Diagnosis Logic ....................................308
DTC Confirmation Procedure ................................308
Diagnosis Procedure .............................................308
Component Inspection ..........................................310
P1551, P1552 BATTERY CURRENT SEN-
SOR ..................................................................
312
Component Description ....................................... ..312
On Board Diagnosis Logic ....................................312
DTC Confirmation Procedure ................................312
Diagnosis Procedure .............................................312
Component Inspection ..........................................314
P1553 BATTERY CURRENT SENSOR ...........316
Component Description ....................................... ..316
On Board Diagnosis Logic ....................................316
DTC Confirmation Procedure ................................316
Diagnosis Procedure .............................................316
Component Inspection ..........................................318
P1554 BATTERY CURRENT SENSOR ...........320
Component Description ....................................... ..320
On Board Diagnosis Logic .....................................320
Overall Function Check .........................................320
Diagnosis Procedure .............................................321
Component Inspection ...........................................322
P1564 ICC STEERING SWITCH .....................324
Component Description .........................................324
On Board Diagnosis Logic .....................................324
DTC Confirmation Procedure ................................324
Diagnosis Procedure .............................................324
Component Inspection ...........................................326
P1564 ASCD STEERING SWITCH .................328
Component Description .........................................328
On Board Diagnosis Logic .....................................328
DTC Confirmation Procedure ................................328
Diagnosis Procedure .............................................328
Component Inspection ...........................................330
P1568 ICC FUNCTION ....................................332
On Board Diagnosis Logic .....................................332
DTC Confirmation Procedure ................................332
Diagnosis Procedure .............................................332
P1572 ICC BRAKE SWITCH ..........................333
Component Description .........................................333
On Board Diagnosis Logic .....................................333
DTC Confirmation Procedure ................................333
Diagnosis Procedure .............................................334
Component Inspection ...........................................337
P1572 ASCD BRAKE SWITCH ......................339
Component Description .........................................339
On Board Diagnosis Logic .....................................339
DTC Confirmation Procedure ................................339
Diagnosis Procedure .............................................340
Component Inspection ...........................................343
P1574 ICC VEHICLE SPEED SENSOR .........344
Component Description .........................................344
On Board Diagnosis Logic .....................................344
DTC Confirmation Procedure ................................344
Diagnosis Procedure .............................................344
P1574 ASCD VEHICLE SPEED SENSOR .....346
Component Description .........................................346
On Board Diagnosis Logic .....................................346
DTC Confirmation Procedure ................................346
Diagnosis Procedure .............................................346
P1805 BRAKE SWITCH .................................348
Description .............................................................348
On Board Diagnosis Logic .....................................348
DTC Confirmation Procedure ................................348
Diagnosis Procedure .............................................348
Component Inspection ...........................................350
P2100, P2103 THROTTLE CONTROL MO-
TOR RELAY ....................................................
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Component Description .........................................351
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On Board Diagnosis Logic .....................................351
DTC Confirmation Procedure ................................351
Diagnosis Procedure .............................................351
P2101 ELECTRIC THROTTLE CONTROL
FUNCTION .......................................................
354
Description ........................................................... ..354
On Board Diagnosis Logic .....................................354
DTC Confirmation Procedure ................................354
Diagnosis Procedure .............................................354
Component Inspection ...........................................357
P2118 THROTTLE CONTROL MOTOR ..........358
Component Description ....................................... ..358
On Board Diagnosis Logic .....................................358
DTC Confirmation Procedure ................................358
Diagnosis Procedure .............................................358
Component Inspection ...........................................359
P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR .....................................................
360
Component Description ....................................... ..360
On Board Diagnosis Logic .....................................360
DTC Confirmation Procedure ................................360
Diagnosis Procedure .............................................361
P2122, P2123 APP SENSOR ..........................362
Component Description ....................................... ..362
On Board Diagnosis Logic .....................................362
DTC Confirmation Procedure ................................362
Diagnosis Procedure .............................................362
Component Inspection ...........................................364
P2127, P2128 APP SENSOR ..........................365
Component Description ....................................... ..365
On Board Diagnosis Logic .....................................365
DTC Confirmation Procedure ................................365
Diagnosis Procedure .............................................365
Component Inspection ...........................................368
P2135 TP SENSOR .........................................369
Component Description ....................................... ..369
On Board Diagnosis Logic .....................................369
DTC Confirmation Procedure ................................369
Diagnosis Procedure .............................................369
Component Inspection ...........................................372
P2138 APP SENSOR ......................................373
Component Description ....................................... ..373
On Board Diagnosis Logic .....................................373
DTC Confirmation Procedure ................................373
Diagnosis Procedure .............................................374
Component Inspection ...........................................376
P2A00, P2A03 A/F SENSOR 1 .......................377
Component Description ....................................... ..377
On Board Diagnosis Logic .....................................377
DTC Confirmation Procedure ................................377
Diagnosis Procedure .............................................378
ASCD BRAKE SWITCH ................................. .383
Component Description ....................................... .383
Diagnosis Procedure .............................................383
Component Inspection ..........................................386
ASCD INDICATOR ...........................................387
Component Description ....................................... .387
Diagnosis Procedure .............................................387
COOLING FAN .................................................388
Diagnosis Procedure ............................................ .388
Component Inspection ..........................................388
ELECTRICAL LOAD SIGNAL ..........................390
Description ........................................................... .390
Diagnosis Procedure .............................................390
FUEL INJECTOR ..............................................392
Component Description ....................................... .392
Diagnosis Procedure .............................................392
Component Inspection ..........................................394
FUEL PUMP .....................................................395
Description ........................................................... .395
Diagnosis Procedure .............................................395
Component Inspection ..........................................398
ICC BRAKE SWITCH ..................................... ..399
Component Description ....................................... .399
Diagnosis Procedure .............................................399
Component Inspection ..........................................402
IGNITION SIGNAL ............................................404
Component Description ....................................... .404
Diagnosis Procedure .............................................404
Component Inspection ..........................................407
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR) .....................................................
409
System Description .............................................. .409
Diagnosis Procedure .............................................409
Component Inspection ..........................................411
POSITIVE CRANKCASE VENTILATION .........414
Description ........................................................... .414
Component Inspection ..........................................414
REFRIGERANT PRESSURE SENSOR ...........416
Component Description ....................................... .416
Diagnosis Procedure .............................................416
ECU DIAGNOSIS ......................................419
ECM ................................................................ ..419
CONSULT-lll Reference Value in Data Monitor
Mode .................................................................... .
419
ECM Harness Connector Terminal Layout ...........422
ECM Terminal and Reference Value ....................422
Wiring Diagram - ENGINE CONTROL SYSTEM - .432
Fail-Safe Chart ......................................................453
DTC Inspection Priority Chart ...............................455
DTC Index .............................................................456
Emission-related Diagnostic Information ..............460
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SYMPTOM DIAGNOSIS ..... .......................475
ENGINE CONTROL SYSTEM SYMPTOMS .. ..475
Symptom Matrix Chart ........................................ ..475
NORMAL OPERATING CONDITION ...............479
Fuel Cut Control (at No Load and High Engine
Speed) ................................................................. ..
479
PRECAUTION ............................................480
PRECAUTIONS .............................................. ..480
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
480
On Board Diagnosis (OBD) System of Engine and
A/T .........................................................................
480
Precaution .............................................................481
PREPARATION .........................................484
PREPARATION .............................................. ..484
Special Service Tool ........................................... ..484
Commercial Service Tool ......................................485
ON-VEHICLE MAINTENANCE ..................487
FUEL PRESSURE .......................................... ..487
Fuel Pressure Check ........................................... ..487
EVAP LEAK CHECK ........................................489
How to Detect Fuel Vapor Leakage .................... ..489
ON-VEHICLE REPAIR ...............................491
EVAP CANISTER ............................................491
Removal and Installation ..................................... ..491
Component Inspection ...........................................491
INTAKE VALVE TIMING CONTROL ..............492
Intake Valve Timing Control Solenoid Valve (LH) ..492
Intake Valve Timing Cont rol Solenoid Valve (RH) ..492
Intake Valve Timing Control Position Sensor (LH) ..493
Intake Valve Timing Control Position Sensor (RH) ..493
Camshaft Position Sensor (PHASE) .....................493
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... ...........................................
495
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
495
Fuel Pressure ...................................................... ..495
Idle Speed and Ignition Timing ..............................495
Calculated Load Value ..........................................495
Mass Air Flow Sensor ............................................495
Intake Air Temperature Sensor .............................495
Engine Coolant Temperature Sensor ....................495
A/F Sensor 1 Heater ..............................................495
Heated Oxygen sensor 2 Heater ...........................496
Crankshaft Position Sensor (POS) ........................496
Camshaft Position Sensor (PHASE) .....................496
Throttle Control Motor ............................................496
Fuel Injector ...........................................................496
Fuel Pump .............................................................496
Revision: December 20092009 QX56

EC-8
< BASIC INSPECTION >[VK56DE]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis IntroductionINFOID:0000000003771293
INTRODUCTION
The engine has an ECM to control major systems such as fuel con-
trol, ignition control, idle air control system, etc. The ECM accepts
input signals from sensors and instantly drives actuators. It is essen-
tial that both input and output signals are proper and stable. At the
same time, it is important that there are no malfunctions such as vac-
uum leaks, fouled spark plugs, or
other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs intermit-
tently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the incidents. A road
test with CONSULT-III (or GST) or a circuit tester connected should
be performed. Follow the Work Flow on "WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a dr iveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A Di agnostic Worksheet like the example
on "Worksheet Sample" should be used.
Start your diagnosis by looking fo r conventional malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.
WORK FLOW
MEF036D
SEF233G
SEF234G
Revision: December 20092009 QX56

DIAGNOSIS AND REPAIR WORKFLOWEC-11
< BASIC INSPECTION > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Are they within the SP value?
Yes >> GO TO 9.
No >> GO TO 8.
8.DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Detect malfunctioning part according to EC-75, "Diagnosis Procedure"
.
Is malfunctioning part detected?
Yes >> GO TO 11.
No >> GO TO 9.
9.DETECT MALFUNCTIONING SYST EM BY SYMPTOM MATRIX CHART
Detect malfunctioning system according to EC-475, "Symptom Matrix Chart"
based on the confirmed symp-
tom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.
>> GO TO 10.
10.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Inspect according to Diagnostic Procedure of the system.
NOTE:
The Diagnostic Procedure in EC section described 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-
34, "Work Flow".
Is malfunctioning part detected?
Yes >> GO TO 11.
No >> Monitor input data from related sensors or check voltage of related ECM terminals using CON-
SULT-III. Refer to EC-422, "ECM Terminal and Reference Value"
, EC-419, "CONSULT-lll Refer-
ence Value in Data Monitor Mode".
11 .REPAIR OR REPLACE THE MALFUNCTIONING PART
1. Repair or replace the malfunctioning part.
2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.
3. Check DTC. If DTC is displayed, erase it, refer to EC-456, "DTC Index"
.
>> GO TO 12.
12.FINAL CHECK
When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall Function Check again,
and then make sure that the malfunction have been repaired securely.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and make sure
that the symptom is not detected.
OK or NG
NG (DTC*1 is detected)>>GO TO 10.
NG (Symptom remains)>>GO TO 6.
OK >> 1. Before returning the vehicle to the cu stomer, make sure to erase unnecessary DTC*
1 in ECM
and TCM (Transmission Control Module). (Refer to EC-456, "DTC Index"
and TM-30, "OBD-
II Diagnostic Trouble Code (DTC)".)
2. If the completion of SRT is needed, drive vehicl e under the specific driving pattern. Refer to
EC-456, "DTC Index"
.
3. INSPECTION END
*1: Include 1st trip DTC.
*2: Include 1st trip freeze frame data.
DIAGNOSTIC WORKSHEET
Description
Revision: December 20092009 QX56