clutch INFINITI QX56 2011 Factory Owner's Manual

DLN-16
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
STRUCTURE AND OPERATION
1. Transfer control unit supplies command current to transfer motor.
2. Transfer motor operates and actuator shaft rotates clockwise.
3. Shift fork operates according to rotation of actuator shaft. Sun gear and Hi-Lo sleeve are engaged.
4. Ball ramp lever operates in axial direction via cam fixed on actuator shaft according to traction torque of
transfer motor, presses piston, and thrusts multiple plate clutch.
5. Torque is transmitted to front wheels according to thrusting pressure of multiple plate clutch. NOTE:
Torque transmitted to the front wheel is determined according to the command current.
4L MODE
1. Main shaft 2. Ball lamp lever 3. Piston
4. Clutch 5. Hi-Lo sleeve 6. Sun gear
7. Shift fork 8. Actuator shaft 9. Transfer control actuator
JPDIE0278GB
Revision: 2010 May2011 QX56

DLN-102
< SYMPTOM DIAGNOSIS >[TRANSFER: ATX90A]
4WD WARNING LAMP BLINKS QUICKLY
4WD WARNING LAMP BLINKS QUICKLY
DescriptionINFOID:0000000006222318
While driving, 4WD warning lamp blinks 2 times in 1 second and it turns OFF after 1 minute.
 This symptom protects drivetrain parts when a heavy
load is applied to the electric controlled coupling and
multiple disc clutch temperature increases. Also, opt ional distribution of torque sometimes becomes rigid
before lamp blinks quickly. Both cases are not malfunction.
 When this symptom occurs, stop vehicle and allow it to idle for some times. Blinking will stop and system will be restored.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)EXL-27
< SYSTEM DESCRIPTION > [XENON TYPE]
C
D
E
F
G H
I
J
K
M A
B
EXL
N
O P
DIAGNOSIS SYSTEM (IPDM E/R)
Diagnosis DescriptionINFOID:0000000006368066
AUTO ACTIVE TEST
Description
In auto active test, the IPDM E/R sends a drive signal to the following systems to check their operation.
 Oil pressure warning lamp
 Rear window defogger
 Front wiper (LO, HI)
 Parking lamp
 License plate lamp
 Tail lamp
 Side marker lamp
 Front fog lamp
 Headlamp (LO, HI)
 A/C compressor (magnet clutch)
Operation Procedure
CAUTION:
Never perform auto active test in the following conditions.
 Engine is running.
 CONSULT-III is connected.
1. Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper
operation)
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON, and within 20 seconds, pr ess the driver door switch 10 times. Then turn the
ignition switch OFF.
CAUTION:
Close passenger door.
4. Turn the ignition switch ON within 10 seconds. Af ter that the horn sounds once and the auto active test
starts.
CAUTION:
Engine starts when ignition switch is turned ON while brake pedal is depressed.
5. The oil pressure warning lamp starts blinking when the auto active test starts.
6. After a series of the following operations is repeated 3 times, auto active test is completed.
NOTE:
 When auto active test has to be cancelled halfw ay through test, turn the ignition switch OFF.
 When auto active test is not activated, door swit ch may be the cause. Check door switch. Refer to DLK-117,
"ComponentFunctionCheck".
Inspection in Auto Active Test
When auto active test is actuated, the following operation sequence is repeated 3 times.
Operation
sequence Inspection location Operation
1 Oil pressure warning lamp Blinks continuously during operation of auto active test
2 Rear window defogger 10 seconds
3 Front wiper LO for 5 seconds → HI for 5 seconds
4 Parking lamp
 License plate lamp
 Tail lamp
 Side marker lamp
 Front fog lamp 10 seconds
Revision: 2010 May2011 QX56

EXL-28
< SYSTEM DESCRIPTION >[XENON TYPE]
DIAGNOSIS SYSTEM (IPDM E/R)
Concept of auto active test
 IPDM E/R starts the auto active test with the door
switch signals transmitted by BCM via CAN communica-
tion. Therefore, the CAN communication line between IPDM E/R and BCM is considered normal if the auto
active test starts successfully.
 The auto active test facilitates troubleshooting if any systems controlled by IPDM E/R cannot be operated.
Diagnosis chart in auto active test
5 Headlamp LO for 10 seconds →HI ON ⇔ OFF 5 times
6 A/C compressor (magnet clutch) ON ⇔ OFF 5 times
Operation
sequence Inspection location Operation
JMMIA0492GB
Symptom Inspection contents Possible cause
Rear window defogger does not operate Perform auto active test.
Does the rear window defog-
ger operate?YES BCM signal input circuit
NO  Rear window defogger
 Rear window defogger
ground circuit
 Harness or connector be- tween IPDM E/R and rear
window defogger
IPDM E/R
Any of the following components do not operate
 Parking lamp
 License plate lamp
Tail lamp
 Side marker lamp
Front fog lamp
 Headlamp (HI, LO)
 Front wiper (HI, LO) Perform auto active test.
Does the applicable system
operate?YES BCM signal input circuit
NO  Lamp or motor
 Lamp or motor ground cir-
cuit
 Harness or connector be- tween IPDM E/R and appli-
cable system
IPDM E/R
A/C compressor does not operate Perform auto active test.
Does the magnet clutch oper-
ate?YES
 A/C auto amp. signal input
circuit
 CAN communication signal
between A/C auto amp. and
ECM
 CAN communication signal
between ECM and IPDM E/
R
NO  Magnet clutch
 Harness or connector be-
tween IPDM E/R and mag-
net clutch
IPDM E/R
Revision: 2010 May2011 QX56

GI-14
< HOW TO USE THIS MANUAL >
ABBREVIATIONS
ABBREVIATIONS
Abbreviation ListINFOID:0000000006280882
The following ABBREVIATIONS are used:
A
B
C
D
ABBREVIATION DESCRIPTION
A/C Air conditioner
A/C Air conditioning
A/F sensor Air fuel ratio sensor A/T Automatic transaxle/transmission
ABS Anti-lock braking system
ACCS Advance climate control system ACL Air cleaner
AP Accelerator pedal
APP Accelerator pedal position ATF Automatic transmission fluid AV Audio visual
AWD All wheel drive
ABBREVIATION DESCRIPTION BARO Barometric pressureBCM Body control module
BLSD Brake limited slip differential BPP Brake pedal positionBSI Blind spot intervention
BSW Blind spot warning
ABBREVIATION DESCRIPTION CKP Crankshaft positionCL Closed loop
CMP Camshaft position CPP Clutch pedal positionCTP Closed throttle position
CVT Continuously Variable transaxle/transmission
ABBREVIATION DESCRIPTION D
1Drive range first gear
D
2Drive range second gear
D
3Drive range third gear
D
4Drive range fourth gear
DCA Distance control assist DFI Direct fuel injection system
DLC Data link connector
DTC Diagnostic trouble code
Revision: 2010 May2011 QX56

HA-1
VENTILATION, HEATER & AIR CONDITIONER
C
DE
F
G H
J
K L
M
SECTION HA
A
B
HA
N
O P
CONTENTS
HEATER & AIR CONDITIONING SYSTEM
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Precaution for Procedure without Cowl Top Cover ......4
Precautions For Refrigerant System Service ............4
Service Equipment ....................................................6
PREPARATION ............................................9
PREPARATION .............................................. .....9
Special Service Tool ........................................... ......9
Commercial Service Tool ........................................12
Sealant or/and Lubricant .........................................12
SYSTEM DESCRIPTION .............................13
COMPONENT PARTS ................................... ....13
Component Parts Location .................................. ....13
Component Description ...........................................13
SYSTEM .............................................................14
System Diagram .................................................. ....14
System Description .................................................14
BASIC INSPECTION ...................................16
DIAGNOSIS AND REPAIR WORKFLOW ..... ....16
Work Flow ........................................................... ....16
REFRIGERANT ..................................................18
Description .......................................................... ....18
Leak Test ................................................................18
Recycle Refrigerant .................................................20
Charge Refrigerant ..................................................20
LUBRICANT ................................................... ....22
Description .......................................................... ....22
Inspection ............................................................ ....22
Perform Lubricant Return Operation .......................22
Lubricant Adjusting Procedure for Components
Replacement Except Compressor ...........................
22
Lubricant Adjusting Procedure for Compressor
Replacement ...........................................................
23
PERFORMANCE TEST ....................................25
Inspection ................................................................25
SYMPTOM DIAGNOSIS ..............................27
REFRIGERATION SYSTEM SYMPTOMS ........27
Trouble Diagnosis For Unusual Pressure ............ ....27
Symptom Table .......................................................27
NOISE ................................................................29
Symptom Table .......................................................29
REMOVAL AND INSTALLATION ...............30
COMPRESSOR .................................................30
Exploded View ..................................................... ....30
COMPRESSOR ..........................................................30
COMPRESSOR : Removal and Installation ............30
MAGNET CLUTCH ................................................ ....31
MAGNET CLUTCH : Removal and Installation of
Compressor Clutch ..................................................
31
Inspection ................................................................32
COOLER PIPE AND HOSE ..............................33
Exploded View .........................................................33
HIGH-PRESSURE FLEXIBLE HOSE ........................34
HIGH-PRESSURE FLEXIBLE HOSE : Removal
and Installation .................................................... ....
34
LOW-PRESSURE FLEXIBLE HOSE ..................... ....35
LOW-PRESSURE FLEXIBLE HOSE : Removal
and Installation ........................................................
35
HIGH-PRESSURE PIPE ............................................35
Revision: 2010 May2011 QX56

PRECAUTIONSHA-5
< PRECAUTION >
C
DE
F
G H
J
K L
M A
B
HA
N
O P
- Never allow lubricant (A/C System Oil Type R) to come in contact with styrene foam parts. Damage
may result.
REFRIGERANT CONNECTION
A new type refrigerant connection has been introduced to a ll refrigerant lines except the following location.
 Expansion valve to evaporator
 Refrigerant pressure sensor to liquid tank
WARNING:
Check that all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loo sen the discharge side hose fitting and remove it.
CAUTION:
Observe the following when replacing or cleaning refrigerant cycle components.
 Store it in the same way at it is when mounted on the car when the compressor is removed. Failure
to do so will cause lubricant to enter the low-pressure chamber.
 Use always a torque wrench and a b ack-up wrench when connecting tubes.
 Plug immediately all openings to prevent entry of dust and mois ture after disconnecting tubes.
 Connect the pipes at the final stag e of the operation when installing an air conditioner in the vehicle.
Never remove the seal caps of pipes and other compon ents until just before required for connection.
 Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
 Remove thoroughly moisture from the refriger ation system before charging the refrigerant.
 Replace always used O-rings.
 Apply lubricant to circle of th e O-rings shown in illustration when connecting tube. Be careful not to
apply lubricant to threaded portion.
 O-ring must be closely attached to the groove portion of tube.
 Be careful not to damage O-ring and tube when replacing the O-ring.
 Connect tube until a click can be heard. Then tighten the nut or bolt by hand. Check that the O-ring is
installed to tube correctly.
 Perform leakage test and make sure that there is no leakage from connections after connecting line.
Disconnect that line and replace the O-ring when the refrigerant leaking point is found. Then tighten
connections of seal seat to the specified torque.
COMPRESSOR
CAUTION:
 Plug all openings to prevent moisture and foreign matter from entering.
 Store it in the same way at it is when moun ted on the car when the compressor is removed.
 Follow “MAINTENANCE OF LUBRICANT LEVEL IN CO MPRESSOR” exactly when replacing or repair-
ing compressor. Refer to HA-22, "
Description".
 Keep friction surfaces between clutch and pulley cl ean. Wipe it off by using a clean waste cloth
moistened with thinner if the surface is contaminated with lubricant.
Name A/C System Oil Type S
RHA861F
Revision: 2010 May2011 QX56

HA-6
< PRECAUTION >
PRECAUTIONS
 Turn the compressor shaft by hand more than five turns in both directions after compressor service
operation. This distributes equall y lubricant inside the compressor. Let the engine idle and operate
the compressor for one hour after the compressor is installed.
 Apply voltage to the new one and check for norma l operation after replacing the compressor magnet
clutch.
LEAK DETECTION DYE
CAUTION:
 The A/C system contains a fluorescent leak detect ion dye used for locating refrigerant leakages. An
ultraviolet (UV) lamp is required to il luminate the dye when inspecting for leakages.
 Wear always fluorescence enhancing UV safety goggles to protect eyes and enhance the visibility of
the fluorescent dye.
 The fluorescent dye leak detector is not a replacem ent for an electrical leak detector. The fluorescent
dye leak detector should be used in conjunction with an electrical leak detector to pin-point refriger-
ant leakages.
 Read and follow all manufacture’ s operating instructions and precau tions prior to performing the
work for the purpose of safet y and customer’s satisfaction.
 A compressor shaft seal should not necessarily be repaired because of dye seepage. The compres-
sor shaft seal should only be repaired after conf irming the leakage with an electrical leak detector.
 Remove always any remaining dye from the leakage area after repairs are completed to avoid a mis-
diagnosis during a future service.
 Never allow dye to come into contact with painted body panels or interior components. Clean imme-
diately with the approved dye cl eaner if dye is spilled. Fluorescent dye left on a surface for an
extended period of time cannot be removed.
 Never spray the fluorescent dye cleaning agent on hot surfaces (eng ine exhaust manifold, etc.).
 Never use more than one refrigerant dye bottle [1/4 ounce (7.4 cc)] per A/C system.
 Leak detection dyes for HFC-134a (R-134a) and CFC- 12 (R-12) A/C systems are different. Never use
HFC-134a (R-134a) leak detection dye in CFC-12 (R- 12) A/C system, or CFC-12 (R-12) leak detection
dye in HFC-134a (R-134a) A/C system, or A/C system damage may result.
 The fluorescent properties of the dye remains fo r three or more years unless a compressor malfunc-
tion occurs.
NOTE:
Identification
 Vehicles with factory installed fluorescent dye have a green label.
 Vehicles without factory installed fluorescent dye have a blue label.
Service EquipmentINFOID:0000000006276140
RECOVERY/RECYCLING RECHARGING EQUIPMENT
Be certain to follow the manufacturer’s instructions for machine operation and machine maintenance. Never
introduce any refrigerant other than that specified into the machine.
ELECTRICAL LEAK DETECTOR
Be certain to follow the manufacturer’s instruct ions for tester operation and tester maintenance.
VACUUM PUMP
Revision: 2010 May2011 QX56

LUBRICANTHA-23
< BASIC INSPECTION >
C
DE
F
G H
J
K L
M A
B
HA
N
O P
Lubricant Adjusting Procedur e for Compressor ReplacementINFOID:0000000006276157
1. Drain lubricant from removed compressor and measure lubricant amount.
1. Drain lubricant from high-pressure port (A) and low-pres-
sure port (B) while rotating magnet clutch.
2. Measure total amount of lubricant that is drained from removed compressor.
2. Drain lubricant from a new compressor that is calculated accord- ing to the following conditions.
CAUTION:
If lubricant amount that is drained from removed compressor is less than 60 m (2.1 Imp fl oz.),
perform calculation by setting “D” as 40 m (1.4 Imp fl oz.).
Conditions Lubricant amount to be added to A/C system
m (Imp fl oz.)
Replace evaporator A/C unit 75 (2.6)
Rear A/C unit 75 (2.6)
Replace condenser 75 (2.6)
Replace liquid tank 5 (0.2)
Refrigerant leakage is detected Large amount leakage 30 (1.1)
Small amount leakage —
Lubricant amount that is recycled together with refrigerant during recycle operation α
JMIIA0675ZZ
Amount to be drained (A) [m (Imp fl oz.)] = F − (D
+ S + R + α)
F : Lubricant amount that a new compressor contains [210 (7.1)]
D : Lubricant amount that is drained from re- moved compressor
S : Lubricant amount that remains inside of re-
moved compressor [20 (0.7)]
R : Lubricant amount to be added according to components that are removed except com-
pressor
α : Lubricant amount that is recycled together
with refrigerant during recycle operation
Conditions Lubricant amount to be added to A/C system
m (Imp fl oz.)
Replace evaporator Front 75 (2.6)
Rear 75 (2.6)
Replace condenser 75 (2.6)
Replace liquid tank 5 ( 0.2)
JPIIA1455GB
Revision: 2010 May2011 QX56

NOISEHA-29
< SYMPTOM DIAGNOSIS >
C
DE
F
G H
J
K L
M A
B
HA
N
O P
NOISE
Symptom TableINFOID:0000000006276161
Symptom Noise source Probable cause Corrective action
Unusual noise from compressor
when A/C is ON. Inside of compressor
Wear, breakage, or clogging of foreign
material in inner parts. Check compressor oil. Re-
fer to
HA-22, "
Inspection".
Magnet clutch Contact of clutch disc with pulley. Check clearance between
clutch disc and pulley. Refer
to
HA-32, "
Inspection".
Compressor body Loosened compressor mounting bolts. Check bolts for tightness.
Refer to
HA-30, "
Exploded
View".
Unusual noise from cooler piping. Cooler piping (pipe and
flexible hose)Improper installation of clip and brack-
et. Check the installation condi-
tion of the cooler piping. Re-
fer to
HA-33, "
Exploded
View".
Unusual noise from expansion
valve when A/C is ON. Expansion valveShortage of refrigerant.  Check for leakage.
 Collect all refrigerant,
evacuate refrigerant cycle
again, and then refill it
with the specified amount
of refrigerant.
Wear, breakage, or clogging of foreign
material in inner parts. Eliminate foreign material
from expansion valve, or re-
place it.
Unusual noise from belt. — Loosened belt
Check belt tension. Refer to
EM-20, "
Checking".
Internal compressor parts ge t locked Replace compressor.
Revision: 2010 May2011 QX56