2004 INFINITI FX35 Engine

SE-6
SQUEAK AND RATTLE TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
DUPLICATE THE NOISE AND TEST DRIVE
If possible, drive the vehicle with the customer until the noise is duplicated. Note any additional information on
the Diagnostic Worksheet regarding the conditions or location of the noise. This information can be used to
duplicate the same conditions when you confirm the repair.
If the noise can be duplicated easily during the test drive, to help identify the source of the noise, try to dupli-
cate the noise with the vehicle stopped by doing one or all of the following:
1) Close a door.
2) Tap or push/pull around the area where the noise appears to be coming from.
3) Rev the engine.
4) Use a floor jack to recreate vehicle “twist”.
5) At idle, apply engine load (electrical load, half-clutch on M/T model, drive position on A/T model).
6) Raise the vehicle on a hoist and hit a tire with a rubber hammer.

Drive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs.

If it is difficult to duplicate the noise, drive the vehicle slowly on an undulating or rough road to stress the
vehicle body.
CHECK RELATED SERVICE BULLETINS
After verifying the customer concern or symptom, check ASIST for Technical Service Bulletins (TSBs) related
to that concern or symptom.
If a TSB relates to the symptom, follow the procedure to repair the noise.
LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSE
1. Narrow down the noise to a general area. To help pinpoint the source of the noise, use a listening tool
(Chassis Ear: J-39570, Engine Ear and mechanics stethoscope).
2. Narrow down the noise to a more specific area and identify the cause of the noise by:

removing the components in the area that you suspect the noise is coming from.
Do not use too much force when removing clips and fasteners, otherwise clips and fastener can be broken
or lost during the repair, resulting in the creation of new noise.

tapping or pushing/pulling the component that you suspect is causing the noise.
Do not tap or push/pull the component with excessive force, otherwise the noise will only be eliminated
temporarily.

feeling for a vibration with your hand by touching the component(s) that you suspect is (are) causing the
noise.

placing a piece of paper between components that you suspect are causing the noise.

looking for loose components and contact marks.
Refer to SE-7, "
Generic Squeak and Rattle Troubleshooting" .
REPAIR THE CAUSE

If the cause is a loose component, tighten the component securely.

If the cause is insufficient clearance between components:
–separate components by repositioning or loosening and retightening the component, if possible.
–insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or ure-
thane tape. A Nissan Squeak and Rattle Kit (J-43980) is available through your authorized Nissan Parts
Department.
CAUTION:
Do not use excessive force as many components are constructed of plastic and may be damaged.
Always check with the Parts Department for the latest parts information.
The following materials are contained in the Nissan Squeak and Rattle Kit (J-43980). Each item can be
ordered separately as needed.
URETHANE PADS [1.5 mm (0.059 in) thick]
Insulates connectors, harness, etc.
76268-9E005: 100 × 135 mm (3.94 × 5.31 in)/76884-71L01: 60 × 85 mm (2.36 × 3.35 in)/76884-71L02: 15
× 25 mm (0.59 × 0.98 in)
INSULATOR (Foam blocks)
Insulates components from contact. Can be used to fill space behind a panel.
73982-9E000: 45 mm (1.77 in) thick, 50 × 50 mm (1.97 × 1.97 in)/73982-50Y00: 10 mm (0.39 in) thick,
50 × 50 mm (1.97 × 1.97 in)

SE-8
SQUEAK AND RATTLE TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid dumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sunvisor shaft shaking in the holder
3. Front or rear windshield touching headlining and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger room.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.

TF-1
TRANSFER
D DRIVELINE/AXLE
CONTENTS
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SECTION TF
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TF
Revision: 2004 November 2004 FX35/FX45
TRANSFER
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions .............................................................. 3
Service Notice .......................................................... 4
Wiring Diagrams and Trouble Diagnosis .................. 4
PREPARATION ........................................................... 5
Special Service Tools ............................................... 5
Commercial Service Tools ........................................ 6
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 7
NVH Troubleshooting Chart ..................................... 7
TRANSFER FLUID ..................................................... 8
Replacement ............................................................ 8
DRAINING ............................................................. 8
FILLING ................................................................. 8
Inspection ................................................................. 8
FLUID LEAKAGE AND FLUID LEVEL .................. 8
AWD SYSTEM ............................................................ 9
Power Transfer Diagram .......................................... 9
System Description .................................................. 9
DESCRIPTION ...................................................... 9
ELECTRIC CONTROLLED COUPLING ............. 10
AWD CONTROL UNIT ........................................ 10
AWD WARNING LAMP ........................................ 11
System Diagram ...................................................... 11
COMPONENTS FUNCTION DESCRIPTION ..... 12
CAN Communication .............................................. 12
SYSTEM DESCRIPTION .................................... 12
TROUBLE DIAGNOSIS ............................................ 13
Fail-Safe Function .................................................. 13
How to Perform Trouble Diagnosis ........................ 13
BASIC CONCEPT ............................................... 13
Location of Electrical Parts ..................................... 14
Circuit Diagram ...................................................... 15
Wiring Diagram — AWD — .................................... 16
Trouble Diagnosis Chart for Symptoms ................. 19
AWD Control Unit Input/Output Signal Reference
Values .................................................................... 19AWD CONTROL UNIT INSPECTION TABLE ..... 19
CONSULT-II Function (ALL MODE AWD/4WD) ..... 21
FUNCTION .......................................................... 21
CONSULT-II SETTING PROCEDURE ................ 21
SELF-DIAG RESULT MODE ............................... 21
DATA MONITOR MODE ...................................... 23
ACTIVE TEST MODE ......................................... 24
AWD CONTROL UNIT PART NUMBER ............. 24
TROUBLE DIAGNOSIS FOR SYSTEM .................... 25
Power Supply Circuit For AWD Control Unit ........... 25
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 25
DIAGNOSTIC PROCEDURE .............................. 25
AWD Control Unit ................................................... 26
DIAGNOSTIC PROCEDURE .............................. 26
ABS System ........................................................... 26
DIAGNOSTIC PROCEDURE .............................. 26
AWD Solenoid ........................................................ 27
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 27
DIAGNOSTIC PROCEDURE .............................. 27
COMPONENT INSPECTION .............................. 29
AWD Actuator Relay ............................................... 30
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 30
DIAGNOSTIC PROCEDURE .............................. 30
Engine Control Signal ............................................. 31
DIAGNOSTIC PROCEDURE .............................. 31
CAN Communication Line ...................................... 31
DIAGNOSTIC PROCEDURE .............................. 31
TROUBLE DIAGNOSIS FOR SYMPTOMS .............. 32
AWD Warning Lamp Does Not Turn ON When The
Ignition Switch Is Turned To ON ............................. 32
DIAGNOSTIC PROCEDURE .............................. 32
AWD Warning Lamp Does Not Turn OFF Several
Seconds After Engine Started ................................ 32
DIAGNOSTIC PROCEDURE .............................. 32
Heavy Tight-corner Braking Symptom Occurs
When The Vehicle Is Driven And The Steering
Wheel Is Turned Fully To Either Side After The

TF-2Revision: 2004 November 2004 FX35/FX45Engine Is Started .................................................... 34
DIAGNOSTIC PROCEDURE .............................. 34
Vehicle Does Not Enter AWD Mode Even Though
AWD Warning Lamp Turned To OFF ...................... 35
DIAGNOSTIC PROCEDURE .............................. 35
While Driving, AWD Warning Lamp Flashes Rapidly
(When Flashing In Approx. 1 Minute And Then Turn-
ing OFF) ................................................................. 36
While Driving, AWD Warning Lamp Flashes Slowly
(When Continuing To Flash Until Turning Ignition
Switch OFF) ............................................................ 36
DIAGNOSTIC PROCEDURE .............................. 36
AWD CONTROL UNIT .............................................. 38
Removal and Installation ........................................ 38
REMOVAL ........................................................... 38
INSTALLATION .................................................... 38
FRONT OIL SEAL ..................................................... 39
Removal and Installation ........................................ 39
REMOVAL ........................................................... 39
INSTALLATION .................................................... 39REAR OIL SEAL ....................................................... 40
Removal and Installation ......................................... 40
REMOVAL ............................................................ 40
INSTALLATION .................................................... 41
AIR BREATHER HOSE ............................................. 42
Removal and Installation ......................................... 42
TRANSFER ASSEMBLY ........................................... 43
Removal and Installation ......................................... 43
REMOVAL ............................................................ 43
INSTALLATION .................................................... 43
Components ............................................................ 44
Disassembly and Assembly .................................... 45
DISASSEMBLY .................................................... 45
INSPECTION ....................................................... 49
ASSEMBLY .......................................................... 49
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 55
General Specifications ............................................ 55

TF-8
TRANSFER FLUID
Revision: 2004 November 2004 FX35/FX45
TRANSFER FLUIDPFP:31001
ReplacementADS000RN
DRAINING
1. Run the vehicle to warm up the transfer unit sufficiently.
2. Stop the engine, and remove the drain plug to drain the transfer
fluid.
3. Apply sealant to drain plug. Install drain plug on transfer and
tighten to the specified torque. Refer to TF-44, "
Components" .

Use Genuine Silicone RTV or equivalent. Refer to GI-48,
"Recommended Chemical Products and Sealants" .
FILLING
1. Remove filler plug and add transfer fluid until fluid level reaches
the specified limit near filler plug mounting hole.
CAUTION:
Carefully fill the fluid. (Fill up for approx. 3 minutes.)
2. Leave the vehicle for 3 minutes, and check the fluid level again.
3. Set a new seal washer onto filler plug and install it on transfer
and tighten to the specified torque. Refer to TF-44, "
Compo-
nents" .
CAUTION:
Do not reuse seal washer.
InspectionADS000RO
FLUID LEAKAGE AND FLUID LEVEL
1. Check fluid level from filler plug mounting hole as shown in the
figure.
2. Before installing filler plug, set a new seal washer. Install filler
plug on transfer and tighten to the specified torque. Refer to TF-
44, "Components" .
CAUTION:
Do not reuse seal washer.
SDIA2087E
Fluid capacity
: Approx. 1.25 (2-5/8 US pt, 2-1/4 lmp pt)
SDIA2028E
SDIA2028E

AWD SYSTEM
TF-9
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Revision: 2004 November 2004 FX35/FX45
AWD SYSTEMPFP:41650
Power Transfer DiagramADS000RV
System DescriptionADS000RW
DESCRIPTION

Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.

Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.

On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close
to rear-wheel drive.

Sensor inputs determine the vehicle's turning condition, and in response tight cornering/braking are con-
trolled by distributing optimum torque to front wheels.
NOTE:

When driving, if there is a large difference between front and rear wheel speed which continues for a long
time, fluid temperature of drive system parts becomes too high and AWD warning lamp flashes rapidly.
(When AWD warning lamp flashes, vehicle changes to rear-wheel drive conditions.) Also, optional distri-
bution of torque sometimes becomes rigid before lamp flashes rapidly, but it is not malfunction.

If AWD warning lamp is flashing rapidly, stop vehicle and allow it to idle for some time. Flashing will stop
and AWD system will be restored.

When driving, AWD warning lamp may flash slowly if there is a significant difference in diameter of the
tires. At this time, vehicle performance is not fully available and cautious driving is required. (Continues
until engine is turned OFF.)

If the warning lamp flashes slowly during driving but remains OFF after engine is restarted, the system is
normal. If it again flashes slowly after driving for some time, vehicle must be inspected.

When the difference of revolution speed between the front and rear wheel with AUTO mode the shift occa-
sionally changes to direct 4-wheel driving conditions automatically. This is not malfunction.
SDIA1611E

AWD SYSTEM
TF-11
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Revision: 2004 November 2004 FX35/FX45
AWD WARNING LAMP
Turns ON when there is a malfunction in AWD system. It indicates that fail-safe mode is engaged and vehicle
change to rear-wheel drive or shifting driving force-AWD (Front-wheels still have some driving torque).
Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately for 1
seconds after the engine starts if system is normal.
AWD Warning Lamp Indication
System DiagramADS000RX
Condition AWD warning lamp
Lamp checkTurns ON when ignition switch is turned ON. Turns OFF
approx. 1 second after engine start.
AWD system malfunctionON
Protection function is activated due to heavy load to electric con-
trolled coupling. (AWD system is not malfunctioning and AWD system
changes to 2WD mode.)Rapid flashing: 2 times/second
(Flashing in approx. 1 minute and then turning OFF.)
Large difference in diameter of front/rear tiresSlow flashing: 1 time/2 seconds
(Continuing to flash until turning ignition switch OFF)
Other than above (system normal) OFF
SDIA2160E

TF-12
AWD SYSTEM
Revision: 2004 November 2004 FX35/FX45
COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationADS000RY
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
For details, refer to LAN-6, "
CAN Communication Unit" .
Component parts Function
AWD control unit

Controls driving force distribution by signals from each sensor and switch from rear wheel driving
mode (0:100) to AWD mode (50:50).

2WD mode is available by fail-safe function if malfunction is detected in AWD system.
Wheel sensors Detects wheel speed.
AWD solenoid Controls electric controlled coupling by command current from AWD control unit.
Electric controlled coupling Transmits driving force to front final drive.
AWD warning lamp

Illuminates if malfunction is detected in electrical system of AWD system.

There is 1 blink in 2 seconds if rotation difference of front wheels and rear wheels is large.

There are 2 blinks in 1 second if load is still applied to driving parts.
ABS actuator and electric unit
(control unit)Transmits the following signals via CAN communication to AWD control unit.

Vehicle speed signal

Stop lamp switch signal (brake signal)
ECMTransmits the following signals via CAN communication to AWD control unit.

Accelerator pedal position signal

Engine speed signal
Unified meter and A/C amp. Transmits conditions of parking brake switch via CAN communication to AWD control unit.