2008 INFINITI FX35 Service Manual

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Page 3793 of 3924

INFINITI FX35 2008 Service Manual
PREPARATIONTF-7
< SERVICE INFORMATION >
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Commercial Service ToolINFOID:0000000001327427
ST30611000
(J-25742-1)
Drift bar
a: 350 mm (1.10 in)
b: 25 mm (1.10 in) dia.
c: M

Page 3794 of 3924

INFINITI FX35 2008 Service Manual
TF-8
< SERVICE INFORMATION >
PREPARATION
Tool nameDescription
Puller Removing companion flange
Flange wrench Removing and installing self-lock nut
Puller Removing front drive shaft front bearin

Page 3795 of 3924

INFINITI FX35 2008 Service Manual
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGTF-9
< SERVICE INFORMATION >
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NOISE, VIBRATION AND HARSHN ESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0

Page 3796 of 3924

INFINITI FX35 2008 Service Manual
TF-10
< SERVICE INFORMATION >
TRANSFER FLUID
TRANSFER FLUID
ReplacementINFOID:0000000001327429
DRAINING
1. Run the vehicle to warm up the transfer unit sufficiently.
2. Stop the engine, and remove th

Page 3797 of 3924

INFINITI FX35 2008 Service Manual
AWD SYSTEMTF-11
< SERVICE INFORMATION >
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AWD SYSTEM
Power Transfer DiagramINFOID:0000000001327431
System DescriptionINFOID:0000000001327432
DESCRIPTION
Electronic cont

AWD SYSTEMTF-11
< SERVICE INFORMATION >
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AWD SYSTEM
Power Transfer DiagramINFOID:0000000001327431
System DescriptionINFOID:0000000001327432
DESCRIPTION
Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
Makes possible stable driving, with no wheel sp in, 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 conditi on, 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 becom es too high and AWD warning lamp flashes rapidly.
(When AWD warning lamp flashes, vehicle changes to r ear-wheel drive conditions.) Also, optional distribu-
tion 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 ther e is a significant difference in diameter of the tires.
At this time, vehicle performance is not fully avail able 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 mode the shift occasionally
changes to direct 4-wheel driving conditions automatically. This is not malfunction.
ELECTRIC CONTROLLED COUPLING
Operation Principle
SDIA1611E
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Page 3798 of 3924

INFINITI FX35 2008 Service Manual
TF-12
< SERVICE INFORMATION >
AWD SYSTEM
1. AWD control unit supplies command current to electric controlled coupling (AWD solenoid).
2. Control clutch is engaged by electromagnet and torque is detec

Page 3799 of 3924

INFINITI FX35 2008 Service Manual
AWD SYSTEMTF-13
< SERVICE INFORMATION >
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SchematicINFOID:0000000001327433
COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationINFOID:0000000001327434
SYSTEM DESCRIPTION
CA

AWD SYSTEMTF-13
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SchematicINFOID:0000000001327433
COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationINFOID:0000000001327434
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication li ne 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-43, "
CAN System Specification Chart".
SDIA2160E
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)
ECM Transmits 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.
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Page 3800 of 3924

INFINITI FX35 2008 Service Manual
TF-14
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
Fail-Safe FunctionINFOID:0000000001327435
If any malfunction occurs in AWD electrical system, and control unit detects the malfunct

TF-14
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
Fail-Safe FunctionINFOID:0000000001327435
If any malfunction occurs in AWD electrical system, and control unit detects the malfunction, AWD warning
lamp on combination meter turns ON to indicate system malfunction.
When AWD warning lamp is ON, vehicle changes to rear-wheel drive or shifting driving force-AWD (Front-
wheels still have some driving torque).
How to Perform Trouble DiagnosisINFOID:0000000001327436
BASIC CONCEPT
To perform trouble diagnosis, it is the most import ant to have understanding about vehicle systems (control
and mechanism) thoroughly.
It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptoms, and understand them fully.
Ask customer about his/her complaints carefully. In some cases, it
will be necessary to check symptoms by driving vehicle with cus-
tomer.
CAUTION:
Customers are not professional. It is dangerous to make an
easy guess like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.
It is essential to check symptoms right from the beginning in order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on inter-
view with customer and past examples. Do not perform inspection
on ad hoc basis. Most intermittent malfunctions are caused by
poor contacts. In this case, it will be effective to shake suspected
harness or connector by hand. When repairing without any symp-
tom diagnosis, you cannot judge if malfunctions have actually been
eliminated.
After completing diagnosis, always erase diagnostic memory. Refer to TF-21, "
CONSULT-III Function (ALL MODE AWD/4WD)".
For intermittent malfunctions, move harness or harness connector by hand. Then check for poor contact or reproduced open circuit.
SEF233G
SEF234G
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