2011 INFINITI QX56 fuel line

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QUICK REFERENCE INDEX
AGENERAL INFORMATIONGIGeneral Information
BENGINEEMEngine Mechanical
LUEngine Lubrication System
COEngine Cooling System
ECEngine Control System
FLFuel System
EXExhaust System
STRStarting System
ACCAccelerator Control System
CHYBRIDHBCHybrid Control System
HBBHybrid Battery System
HBRHybrid Brake System
DTRANSMISSION & DRIVE-
LINECLClutch
TMTransaxle & Transmission
DLNDriveline
FAXFront Axle
RAXRear Axle
ESUSPENSIONFSUFront Suspension
RSURear Suspension
SCSSuspension Control System
WTRoad Wheels & Tires
FBRAKESBRBrake System
PBParking Brake System
BRCBrake Control System
GSTEERINGSTSteering System
STCSteering Control System
HRESTRAINTSSBSeat Belt
SBCSeat Belt Control System
SRSRS Airbag
SRCSRS Airbag Control System
IVENTILATION, HEATER &
AIR CONDITIONERVTLVentilation System
HAHeater & Air Conditioning System
HACHeater & Air Conditioning Control System
JBODY INTERIORINTInterior
IPInstrument Panel
SESeat
ADPAutomatic Drive Positioner
KBODY EXTERIOR,
DOORS, ROOF & VEHICLE
SECURITYDLKDoor & Lock
SECSecurity Control System
GWGlass & Window System
PWCPower Window Control System
RFRoof
HDHood
EXTExterior
BRMBody Repair
LDRIVER CONTROLSMIRMirrors
EXLExterior Lighting System
INLInterior Lighting System
WWWiper & Washer
DEFDefogger
HRNHorn
MELECTRICAL & POWER
CONTROLPWOPower Outlet
BCSBody Control System
LANLAN System
PCSPower Control System
CHGCharging System
PGPower Supply, Ground & Circuit Elements
NDRIVER INFORMATION &
MULTIMEDIAMWIMeter, Warning Lamp & Indicator
WCSWarning Chime System
SNSonar System
AVAudio, Visual & Navigation System
OCRUISE CONTROL &
DRIVER ASSISTANCECCSCruise Control System
DASDriver Assistance System
DMSDrive Mode System
PMAINTENANCEMAMaintenance
All rights reserved. No part
of this Service Manual may
be reproduced or stored in a
retrieval system, or transmit-
ted in any form, or by any
means, electronic, mechani-
cal, recording or otherwise,
without the prior written per-
mission of NISSAN MOTOR
CO., LTD.
Edition: May 2010
Publication No. SM1E-1Z62U0

AV-14
< SYSTEM DESCRIPTION >
SYSTEM
MULTI AV SYSTEM : System Description
INFOID:0000000006216216
Multi AV system means that the following systems are integrated.
COMMUNICATION SIGNAL
 AV control unit function by transmitting/receiving dat a one by one with each unit (slave unit) that configures
them completely as a master unit by connecting between units that configure MULTI AV system with two AV
communication lines (H, L).
 Two AV communication lines (H, L) adopt a twisted pair line that is resistant to noise.
 AV control unit is connected by CAN communication, and it receives data signal from ECM and combination
meter It computes and displays fuel economy information value with the obtained information. Transmitting/
receiving of data signal is performed by BCM. Also, it transmits the required signal of vehicle setting and
receives the response signal.
 AV control unit is connected with front display unit and serial communication, and it transmits the required
signal of display and display control and receives the response signal from front display unit.
NAVIGATION SYSTEM FUNCTION
Description
 The AV control unit controls navigation function whil e GPS tuner has built-in map data, GYRO (angle speed
sensor), on the HDD (Hard Disk Drive).
 The AV control unit inputs operation signal with communication signal, through display (touch panel) and multifunction switch and steering switch.
 Guide sound is output to front speaker through BOSE am p. from AV control unit when operating navigation
system.
 A vehicle position is calculated with the GYRO (angl e speed sensor), vehicle sensor, signal from GPS satel-
lite and map data stored on HDD (Hard Disk Drive), and transmits the map image signal (RGB image, RGB
area, RGB image synchronizing) to the display.
Position Detection Principle
The navigation system periodically calculates the current vehicle
position according to the following three types of signals.
 Travel distance of the vehicle as determined by the vehicle speed
sensor
 Vehicle turning angle determined by the gyroscope (angular speed
sensor)
 The travel direction of the v ehicle determined by the GPS antenna
(GPS information)
The current position of the vehicle is then identified by comparing the
calculated vehicle position with map data, which is stored in the HDD
(Hard Disk Drive) (map-matching), and indicated on the screen with
a current location mark. More accurate data is used by comparing
position detection results from GPS to the map-matching.
FUNCTION NAME
Navigation system function Audio function
DVD play function
Front auxiliary input function USB connection function
Mobile entertainment system Hands-free phone function Touch panel function
Around view monitor function
Camera assistance sonar system Vehicle information function
Auto Light adjustment system
JSNIA0177GB
Revision: 2010 May2011 QX56

CCS-72
< BASIC INSPECTION >[ICC]
LASER BEAM AIMING ADJUSTMENT
LASER BEAM AIMING ADJUSTMENT
DescriptionINFOID:0000000006224293
OUTLINE OF LASER BEAM AIMING ADJUSTMENT
Always adjust the laser beam aiming after removing and installing or replacing the ICC sensor.
CAUTION:
The system does not operate normally
unless the laser beam aiming adjustment is performed. Always
perform it.
1. Set the ICC target board [SST: KV99110100 (J-45718)] to the correct position in front of the vehicle.
2. Set the laser beam aiming mode (“LASER BEAM AD JUST” on “Work support”) with CONSULT-III, and
then perform the adjustment according to the displa y. (Manually turn the up-down direction adjusting
screw for vertical adjustment. ICC sensor adjusts the automatic aiming for the horizontal direction.)
CAUTIONARY POINT FOR LASER BEAM AIMING ADJUSTMENT
CAUTION:
 For laser beam aiming adjustment, choose a level location where a view can be obtained without any
obstruction as far as 12 m (39 ft) or more in the forward direction.
 Adjust laser beam aiming for 5 second s or more after starting engine.
 Adjust the laser beam aiming with CONSULT-III. (The laser beam aiming cannot be adjusted without
CONSULT-III.)
 Never enter the vehicle during laser beam aiming adjustment.
 Never look directly into the laser beam sour ce (ICC sensor body window) during laser beam aiming
adjustment.
 Laser beam aiming adjustment is performed at idle. At this time, turn the headlamps OFF.
Work Procedure (Preparation)INFOID:0000000006224294
1.ADVANCE PREPARATION FOR LASER BEAM AIMING ADJUSTMENT
1. Adjust all tire pressure to the specified value.
2. Empty the vehicle. (Remove any luggage from the passenger compartment, luggage room, etc.)
3. Shift the selector lever to “P” pos ition, and release the parking brake.
4. Fully fill the fuel tank, and then check that t he coolant and oils are filled up to correct level.
5. Clean off the ICC sensor body window with a soft cloth.
>> Go to CCS-72, "
Work Procedure (Setting The ICC Tar-
get Board)".
Work Procedure (Setting The ICC Target Board)INFOID:0000000006224295
DESCRIPTION
Accurate adjustment of the laser beam requires t hat the ICC target board be accurately positioned.
CAUTION:
If the laser beam is adjusted with the ICC target board in the incorrect position, the ICC system does
not function normally.
1.ICC TARGET BOARD HEIGHT ADJUSTMENT
1 : ICC sensor
JSOIA0372ZZ
Revision: 2010 May2011 QX56

COMPONENT PARTSDLK-13
< SYSTEM DESCRIPTION >
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AUTOMATIC BACK DOOR SYSTEM
Combination meter  Displays each operation method guide and warning for system malfunction
 Performs operation method guide and warning with buzzer
 Transmits vehicle speed signal to CAN communication line
TCM Transmits shift position signal to BCM via CAN communication line
Remote keyless entry receiver Receives Intelligent Key operation and transmits to BCM
Inside key antenna Detects if Intelligent Key is inside the vehicle
Outside key antenna Detects if Intelligent Key is outside the vehicle
Push-button ignition switch Inputs push-button ignition switch ON/OFF condition to BCM
Door switch Inputs door open/close condition to BCM
Door lock and unlock switch  Detects if door lock and unlock switch is press/release
 Integrated in the power window main switch and front power window switch (passenger
side)
Door request switch  Detects if each door request switch is press/release
 Integrated in the outside handle (driver side, passenger side) and back door opener
switch assembly
Intelligent Key warning buzzer Warns the user of the lock/unlock condition and inappropriate operations with the buzzer
sound
Intelligent Key The following functions are available when having and carrying electronic ID
 Door lock/unlock
 Engine start
 Remote control entry function is available when operating on button
Hazard warning lamp Warns the user of the lock/unlock condition and inappropriate operations with the lamps
blink
Door lock actuator Output lock/unlock signal from BCM and locks/unlocks each door
Fuel lid lock actuator Output lock/unlock signal from BCM and locks/unlocks fuel filler lid Item Function
Revision: 2010 May2011 QX56

DLK-252
< REMOVAL AND INSTALLATION >
CAB MOUNTING INSULATOR
 Drain brake fluid from brake line. Refer to BR-10, "Draining".
 Release fuel pressure. Refer to EC-153, "
Work Procedure".
 Disconnect both battery cables. Refer to PG-164, "
Removal and Installation".
 Drain engine coolant from radiator. Refer to CO-8, "
Draining".
 Discharge refrigerant from A/C circuit. Refer to HA-20, "
Recycle Refrigerant".
 Drain power steering fluid from reservoir tank.
4. Remove parts relating to connection of body assembly and frame assembly.  Tire and wheel: Refer to WT-64, "
Removal and Installation" (with TPMS).
 Front fender protector (LH and RH): Refer to EXT-23, "
FENDER PROTECTOR : Removal and Installa-
tion".
 Front bumper: Refer to EXT-13, "
Removal and Installation".
 Radiator core support upper: Refer to DLK-220, "
Removal and Installation".
 Fan shroud: Refer to CO-16, "
Removal and Installation".
 Battery and battery case: Refer to PG-164, "
Removal and Installation".
 Air cleaner case (upper and lower): Refer to EM-27, "
Removal and Installation".
 Engine cover: Refer to EM-25, "
Removal and Installation".
 Rear wheel house protector (LH and RH): EXT-24, "
REAR WHEEL HOUSE PROTECTOR : Removal
and Installation".
 Rear bumper: Refer to EXT-17, "
Removal and Installation".
 Fuel filler tube: Remove to FL-8, "
Exploded View".
 Spare tire
 Towing hook bracket.
5. Separate parts relating to connection of body assembly and frame assembly. Vehicle front
 Disconnect ICC sensor connector. (models with ICC) Refer to CCS-176, "
Removal and Installation".
 Remove radiator upper hose and radiator lower hose from radiator assembly. Refer to CO-13,
"Exploded View".
 Remove A/T fluid cooler hose B and A/T fluid cooler hose E from A/T fluid cooler tubes. Refer to TM-
202, "Exploded View".
 Remove power steering return hose from oil cooler, and then power steering return hose clamp bolt from frame assembly. Refer to ST-54, "
Exploded View".
 Remove power steering suction hose from reservoir tank. Refer to ST-54, "
Exploded View".
CAUTION:
Never spill power steering fluid in engine room.
 Remove A/C low-presser flexible hose from A/C low-presser pipe. Refer to HA-35, "
LOW-PRESSURE
FLEXIBLE HOSE : Removal and Installation".
 Remove A/C hi-presser flexible hose from condenser. Refer to HA-34, "
HIGH-PRESSURE FLEXIBLE
HOSE : Removal and Installation".
 Remove all engine Control Harness connectors, har ness clips and others that are connected to the
body assembly side of the engine room. (engine room LH and RH side). Refer to PG-148, "
Engine Con-
trol Harness".
NOTE:
Separate harness connectors from ECM (engine control module). Refer to EC-10, "
General Precau-
tions".
CAUTION:
 When pulling out harnesses, never damage harnesses or connectors.
 After temporarily securing connectors, cover th em with vinyl or similar material to protect
against adhesion of foreign materials.
 Disconnect engine room harness connectors and remo ve harness clips from engine assembly (engine
RH side). Refer to PG-146, "
Engine Room Harness".
 Remove heater hoses from front water outlet tube (engine room RH side). Refer to HA-33, "
Exploded
View".
 Disconnect front wheel sensor connectors (LH and RH). Refer to BRC-134, "
FRONT WHEEL SENSOR
: Exploded View".
 Disconnect fuel feed tube and EVAP hos e (front wheel well LH side).
 Remove steering lower shaft from steering gear side assembly. Refer to ST-37, "
Removal and Installa-
tion"
CAUTION:
Spiral cable may be cut if steering wheel turns while separating steering column assembly and
steering gear assembly.
Revision: 2010 May2011 QX56

EC-1
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SECTION EC
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CONTENTS
ENGINE CONTROL SYSTEM
VK56VD
PRECAUTION ................ ...............................
9
PRECAUTIONS .............................................. .....9
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
9
Precaution for Procedure without Cowl Top Cover ......9
Precautions For Xenon Headlamp Service ...............9
On Board Diagnostic (OBD) System of Engine
and A/T ....................................................................
10
General Precautions ...............................................10
PREPARATION ...........................................14
PREPARATION .............................................. ....14
Special Service Tools .......................................... ....14
Commercial Service Tools ......................................14
SYSTEM DESCRIPTION .............................16
COMPONENT PARTS ................................... ....16
Component Parts Location .................................. ....16
Component Description ...........................................19
Accelerator Pedal Position Sensor ..........................21
Air Fuel Ratio (A/F) Sensor 1 ..................................21
ASCD Brake Switch & Stop Lamp Switch ...............21
ASCD Steering Switch ............................................21
ASCD Indicators ......................................................21
Battery Current Sensor (With Battery Tempera-
ture Sensor) ............................................................
22
Camshaft Position Sensor .......................................22
Crankshaft Position Sensor .....................................23
ECM ........................................................................23
Electric Throttle Control Actuator ............................23
Electrically-controlled cooling fan coupling .............24
Engine Coolant Temperature Sensor ......................25
Engine Oil Temperature Sensor ..............................25
EVAP Control System Pressure Sensor .................26
EVAP Canister Vent Control Valve .........................26
EVAP Canister Purge Volume Control Solenoid
Valve .................................................................... ....
26
Fuel Injector .............................................................26
Fuel Level Sensor ....................................................26
Fuel Pump Control Module ......................................27
Fuel Rail Pressure Sensor .......................................27
Fuel Tank Temperature Sensor ...............................27
Heated Oxygen Sensor 2 ........................................27
High Pressure Fuel Pump .......................................28
ICC Brake Switch & Stop Lamp Switch ...................29
ICC Steering Switch ................................................29
Ignition Coil With Power Transistor .........................29
Intake Valve Timing Control Solenoid Valve ...........29
Knock Sensor ...................................................... ....30
Low Fuel Pressure Sensor ......................................30
Low Pressure Fuel Pump ........................................30
Malfunction Indicator Lamp (MIL) ............................30
Manifold Absolute Pressure Sensor ........................31
Mass Air Flow Sensor (With Intake Air Tempera-
ture Sensor) .............................................................
31
Power Steering Pressure (PSP) Sensor ..................31
Refrigerant Pressure Sensor ............................... ....32
VVEL Actuator Motor ...............................................32
VVEL Actuator Motor Relay .....................................32
VVEL Control Module ..............................................32
VVEL Control Shaft Position Sensor .......................32
STRUCTURE AND OPERATION .....................33
Positive Crankcase Ventilation ................................33
On Board Refueling Vapor Recovery (ORVR) ........34
SYSTEM ............................................................35
ENGINE CONTROL SYSTEM ........................ ...........35
ENGINE CONTROL SYSTEM : System Diagram ....35
ENGINE CONTROL SYSTEM : System Descrip-
tion ...........................................................................
35
DIRECT INJECTION GASOLINE SYSTEM .......... ....36
DIRECT INJECTION GASOLINE SYSTEM :
System Diagram .....................................................
36
Revision: 2010 May2011 QX56

EC-2
DIRECT INJECTION GASOLINE SYSTEM : Sys-
tem Description .......................................................
36
FUEL PRESSURE CONTROL ..................................39
FUEL PRESSURE CONTROL : System Diagram
...
39
FUEL PRESSURE CONTROL : System Descrip-
tion ..........................................................................
39
COOLING FAN CONTROL .................................... ...40
COOLING FAN CONTROL : System Diagram .......41
COOLING FAN CONTROL : System Description ...41
ELECTRIC IGNITION SYST EM ................................41
ELECTRIC IGNITION SYSTEM :
System Diagram ................................................. ...
42
ELECTRIC IGNITION SYSTEM : System De-
scription ..................................................................
42
INTAKE VALVE TIMING CONTROL ..................... ...43
INTAKE VALVE TIMING CONTROL : System Di-
agram .....................................................................
43
INTAKE VALVE TIMING CONTROL : System De-
scription ..................................................................
43
VVEL SYSTEM ....................................... ...................43
VVEL SYSTEM : System Dia gram ........................44
VVEL SYSTEM : System De scription .....................44
EVAPORATIVE EMISSION SYSTEM .................... ...45
EVAPORATIVE EMISSION SYSTEM : System
Diagram ..................................................................
45
EVAPORATIVE EMISSION SYSTEM : System
Description ..............................................................
45
AIR CONDITIONING CUT CONTROL ................... ...46
AIR CONDITIONING CUT CONTROL : System
Diagram ..................................................................
47
AIR CONDITIONING CUT CONTROL : System
Description ..............................................................
47
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ...47
AUTOMATIC SPEED CONTROL DEVICE (AS-
CD) : System Diagram ............................................
48
AUTOMATIC SPEED CONTROL DEVICE (AS-
CD) : System Description .......................................
48
CAN COMMUNICATION ........................................ ...48
CAN COMMUNICATION : System Description ......48
OPERATION ................................................... ...49
AUTMATIC SPEED CONTROL DEVICE (ASCD) . ...49
AUTMATIC SPEED CONTROL DEVICE (ASCD)
: Switch Name and Function ...................................
49
ON BOARD DIAGNOSTIC (OBD) SYSTEM .....51
Diagnosis Description .......................................... ...51
GST (Generic Scan Tool) .......................................51
DIAGNOSIS SYSTEM (ECM) ............................52
DIAGNOSIS DESCRIPTION .................................. ...52
DIAGNOSIS DESCRIPTION : 1st Trip Detection
Logic and Two Trip Detection Logic ........................
52
DIAGNOSIS DESCRIPTION : DTC and Freeze
Frame Data .............................................................
52
DIAGNOSIS DESCRIPTION : Counter System ......53
DIAGNOSIS DESCRIPTION : Driving Pattern ........58
DIAGNOSIS DESCRIPTION : System Readiness
Test (SRT) Code .................................................. ...
58
DIAGNOSIS DESCRIPTION : Malfunction Indica-
tor Lamp (MIL) ..................................................... ...
60
On Board Diagnosis Function .................................60
CONSULT-III Function ............................................63
ECU DIAGNOSIS INFORMATION .............72
ECM ................................................................ ...72
Reference Value .................................................. ...72
Fail-safe ..................................................................93
DTC Inspection Priority Chart .................................96
DTC Index ...............................................................98
Test Value and Test Limit ..................................104
VVEL CONTROL MODULE .............................110
Reference Value .................................................. .110
WIRING DIAGRAM ...................................114
ENGINE CONTROL SYSTEM ........................ ..114
Wiring Diagram .................................................... .114
BASIC INSPECTION .................................135
DIAGNOSIS AND REPAIR WORKFLOW ...... ..135
Work Flow ............................................................ .135
Diagnostic Work Sheet .........................................138
BASIC INSPECTION ...................................... ..139
Work Procedure ................................................... .139
ADDITIONAL SERVICE WHEN REPLACING
ECM ..................................................................
143
Description ........................................................... .143
Work Procedure ....................................................143
ADDITIONAL SERVICE WHEN REPLACING
VVEL CONTROL MODULE .............................
144
Description ........................................................... .144
Work Procedure ....................................................144
VIN REGISTRATION ........................................145
Description ........................................................... .145
Work Procedure ....................................................145
ACCELERATOR PEDAL RELEASED POSI-
TION LEARNING ............................................ ..
146
Description ........................................................... .146
Work Procedure ....................................................146
THROTTLE VALVE CLOSED POSITION
LEARNING .......................................................
147
Description ........................................................... .147
Revision: 2010 May2011 QX56

EC-6
DTC Logic ..............................................................364
Diagnosis Procedure .............................................365
P0527 COOLING FAN SPEED SENSOR .......367
DTC Logic ............................................................ ..367
Diagnosis Procedure .............................................367
Component Inspection (Cooling Fan Speed Sen-
sor) ........................................................................
369
P0550 PSP SENSOR .......................................371
DTC Logic ............................................................ ..371
Diagnosis Procedure .............................................371
Component Inspection (Power Steering Pressure
Sensor) ..................................................................
373
P0603 ECM POWER SUPPLY ........................374
DTC Logic ............................................................ ..374
Diagnosis Procedure .............................................374
P0605 ECM ......................................................376
DTC Logic ............................................................ ..376
Diagnosis Procedure .............................................376
P0607 ECM ......................................................378
DTC Logic ............................................................ ..378
Diagnosis Procedure .............................................378
P0611 ECM PROTECTION .............................379
Description ........................................................... ..379
DTC Logic ..............................................................379
Diagnosis Procedure .............................................379
P062B ECM .....................................................380
Description ........................................................... ..380
DTC Logic ..............................................................380
Diagnosis Procedure .............................................380
P0643 SENSOR POWER SUPPLY .................381
DTC Logic ............................................................ ..381
Diagnosis Procedure .............................................381
P0850 PNP SWITCH .......................................383
Description ........................................................... ..383
DTC Logic ..............................................................383
Component Function Check ..................................384
Diagnosis Procedure .............................................384
P1087, P1088 VVEL SYSTEM ........................386
DTC Logic ............................................................ ..386
Diagnosis Procedure .............................................386
P1089, P1092 VVEL CONTROL SHAFT PO-
SITION SENSOR .............................................
387
DTC Logic ............................................................ ..387
Diagnosis Procedure .............................................387
P1090, P1093 VVEL ACTUATOR MOTOR .....390
DTC Logic ............................................................ ..390
Diagnosis Procedure .............................................390
Component Inspection (VVEL ACTUATOR MO-
TOR ASSEMBLY) .................................................
392
Component Inspection (VVEL ACTUATOR
HOUSING ASSEMBLY) ......... ...............................
392
P1091 VVEL ACTUATOR MOTOR RELAY ... ..393
DTC Logic ............................................................ .393
Diagnosis Procedure .............................................393
Component Inspection (VVEL Actuator Motor Re-
lay) ....................................................................... .
395
P1148, P1168 CLOSED LOOP CONTROL .....396
DTC Logic ............................................................ .396
Diagnosis Procedure .............................................396
P1197 OUT OF GAS ........................................397
Description ........................................................... .397
DTC Logic .............................................................397
Diagnosis Procedure .............................................398
P1212 TCS COMMUNICATION LINE ..............399
Description ........................................................... .399
DTC Logic .............................................................399
Diagnosis Procedure .............................................399
P1217 ENGINE OVER TEMPERATURE .........400
DTC Logic ............................................................ .400
Component Function Check .................................400
Diagnosis Procedure .............................................401
P1220 FUEL PUMP CONTROL MODULE
(FPCM) ..............................................................
403
DTC Logic ............................................................ .403
Diagnosis Procedure .............................................403
Component Inspection (FPCM) ............................405
P1225 TP SENSOR ..........................................406
DTC Logic ............................................................ .406
Diagnosis Procedure .............................................406
P1226 TP SENSOR ..........................................407
DTC Logic ............................................................ .407
Diagnosis Procedure .............................................407
P1421 COLD START CONTROL .....................408
Description ........................................................... .408
DTC Logic .............................................................408
Diagnosis Procedure .............................................408
P1423, P1424 COLD START CONTROL ........410
Description ........................................................... .410
DTC Logic .............................................................410
Diagnosis Procedure .............................................410
P1550 BATTERY CURRENT SENSOR ...........412
DTC Logic ............................................................ .412
Diagnosis Procedure .............................................412
Component Inspection (Battery Current Sensor) ..414
P1551, P1552 BATTERY CURRENT SEN-
SOR ..................................................................
416
DTC Logic ............................................................ .416
Diagnosis Procedure .............................................416
Component Inspection (Battery Current Sensor) ..419
Revision: 2010 May2011 QX56