Front end INFINITI FX35 2004 Service Manual

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.

TROUBLE DIAGNOSIS
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Revision: 2004 November 2004 FX35/FX45
Trouble Diagnosis Chart for SymptomsADS000S3
If AWD warning lamp turns ON, perform self-diagnosis. Refer to TF-21, "SELF-DIAG RESULT MODE" .
NOTE:
Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunction.
AWD Control Unit Input/Output Signal Reference ValuesADS000S4
AWD CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Symptom Condition Check items Reference page
AWD warning lamp does not turn ON when
the ignition switch is turned to ON.
(AWD warning lamp check)Ignition switch: ONCAN communication line
TF-32
Unified meter and A/C amp.
Unified meter control unit
AWD warning lamp does not turn OFF sev-
eral seconds after engine started.Engine runningCAN communication line
TF-32
Power supply and ground for AWD con-
trol unit
Unified meter and A/C amp.
Unified meter control unit
AWD solenoid
AWD actuator relay (integrated in AWD
control unit)
Wheel sensor
Heavy tight-corner braking symptom occurs
when the vehicle is driven and the steering
wheel is turned fully to either side after the
engine is started. (See NOTE.)

While driving

Steering wheel is
turned fully to either
sidesCAN communication line
TF-34Accelerator pedal position signal
AWD solenoid
Mechanical malfunction of electric con-
trolled coupling (clutch sticking etc.)
Vehicle does not enter AWD mode even
though AWD warning lamp turned to OFF.While drivingAWD solenoid
TF-35
Mechanical malfunction of electric con-
trolled coupling (Mechanical engage-
ment of clutch is not possible.)
While driving, AWD warning lamp flashes
rapidly. (When flashing in approx. 1 minute
and then turning OFF.)
Rapid flashing: 2 times/secondWhile drivingProtection function is activated due to
heavy load to electric controlled cou-
pling. (AWD system is not malfunction-
ing. Also, optional distribution of torque
sometimes becomes rigid before lamp
flashes rapidly, but it is not malfunction.)TF-36
While driving, AWD warning lamp flashes
slowly. (When continuing to flash until turn-
ing ignition switch OFF)
Slow flashing: 1 time/2 seconds
While driving

Vehicle speed: 20 km/h
(12 MPH) or moreTire size is different between front and
rear of vehicle.TF-36
Monitored item [Unit] Content Condition Display value
FR RH SENSOR [km/h] or [mph]Wheel speed (Front wheel
right)Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition.Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
FR LH SENSOR [km/h] or [mph]Wheel speed (Front wheel
left)Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition.Approximately equal to
the indication on speed-
ometer (Inside of ±10%)

TROUBLE DIAGNOSIS FOR SYMPTOMS
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Revision: 2004 November 2004 FX35/FX45
3. CHECK SYSTEM FOR AWD SOLENOID
Perform trouble diagnoses for AWD solenoid system. Refer to TF-27, "
AWD Solenoid" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK ELECTRIC CONTROLLED COUPLING
1. Turn ignition switch “OFF”.
2. Set the selector lever to “N” (neutral) position and disengage the parking brake.
3. Lift up the vehicle.
4. Rotate the rear propeller shaft by hand.
5. Hold front propeller shaft lightly.
Does front propeller shaft rotate?
YES >> Replace electric controlled coupling for mechanical malfunction (clutch sticking etc.). Refer to TF-
45, "Disassembly and Assembly" .
NO >> GO TO 5.
5. CHECK SYMPTOM
Check again.
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6. CHECK AWD CONTROL UNIT
Check AWD control unit input/output signal. Refer to TF-19, "
AWD Control Unit Input/Output Signal Reference
Va l u e s" .
OK or NG
OK >>INSPECTION END
NG >> Check AWD control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.
Vehicle Does Not Enter AWD Mode Even Though AWD Warning Lamp Turned To
OFF
ADS000U0
DIAGNOSTIC PROCEDURE
1. CHECK AWD SOLENOID
Check AWD solenoid. Refer to TF-29, "
COMPONENT INSPECTION" .
OK or NG
OK >> GO TO 2.
NG >> Replace electric controlled coupling for malfunction of AWD solenoid. Refer to TF-45, "
Disassem-
bly and Assembly" .
2. CHECK AWD CONTROL UNIT
Check AWD control unit input/output signal. Refer to TF-19, "
AWD Control Unit Input/Output Signal Reference
Va l u e s" .
OK or NG
OK >> GO TO 3.
NG >> Check AWD control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.

FRONT OIL SEAL
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Revision: 2004 November 2004 FX35/FX45
FRONT OIL SEALPFP:38189
Removal and InstallationADS000RP
REMOVAL
1. Remove the drain plug to drain the transfer fluid. Refer to TF-8, "Replacement" .
2. Remove the front propeller shaft. Refer to PR-4, "
FRONT PROPELLER SHAFT" .
3. Remove front oil seal using a flat-bladed screwdriver.
CAUTION:
Be careful not to damage the center case.
INSTALLATION
1. Apply multi-purpose grease to oil seal lips. Install the front oil
seal with a drift until the end face of front case.
CAUTION:

Do not reuse front oil seal.

When installing, do not incline the oil seal.
2. Install front propeller shaft. Refer to PR-4, "
FRONT PROPEL-
LER SHAFT" .
3. Install transfer fluid, check fluid level and for fluid leakage. Refer
to TF-8, "
Inspection" .
SDIA1782E
Tool number : ST27862000 ( — )
SDIA1783E

TF-46
TRANSFER ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
4. Remove snap ring from front case.
5. Remove main shaft bearing from front case.
Rear Case
1. Remove the drive chain and front drive shaft from rear case.
2. Remove companion flange lock nut from main shaft using the
flange wrench.
3. Put matching mark on the end of the main shaft corresponding
to the B position matching mark on the companion flange.
SDIA1601E
SDIA1595E
SDIA1693E
Tool number : KV38108300 (J44195)
SDIA1694E
SDIA1798E

TF-54
TRANSFER ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
9. Install the drive chain and front drive shaft to rear case.
10. Apply liquid gasket to the entire front case mounting surface of
rear case as shown in the figure.

Use Genuine Anaerobic Liquid Gasket or equivalent.
Refer to GI-48, "
Recommended Chemical Products and
Sealants" .
CAUTION:
Be careful not to damage the mating surface.
11. Install front case to rear case.
CAUTION:
Be careful not to damage the mating surface transmission
side.
12. Tighten bolts to specified torque.
SDIA1707E
SDIA2312E
SDIA1709E
Bolts symbol QuantityNominal length
mm (in)Tighten torque
N·m (kg-m, ft-Ib)
A 11 42 (1.65)
21.6 (2.2, 16) B 1 162 (6.38)
C 1 97 (3.82)
Torx bolts 1 40 (1.57) 18.2 (1.9, 13)
SDIA2296E

WT-14
TROUBLE DIAGNOSES
Revision: 2004 November 2004 FX35/FX45
Control Unit Input/Output Signal StandardAES000NU
Standards using a circuit tester and oscilloscope.
( ): Wire color
ID Registration ProcedureAES000NV
ID REGISTRATION WITH TRANSMITTER ACTIVATION TOOL
This procedure must do after replace transmitter or low tire pressure warning control unit.
1. Turn ignition switch “OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data link connector.
3. Touch “AIR PRESSURE MONITOR”, “WORK SUPPORT” and “ID REGIST”.
NOTE:
If “AIR PRESSURE MONITOR” is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC)
Circuit" .
4. With the transmitter activation tool (J-45295) pushed against the
front-left transmitter position of the tire air valve, press the button
then keep 5 seconds.
5. Register the IDs in order from FR LH, FR RH, RR RH or RR LH. When ID registration of each wheel has
been completed, a buzzer sounds and hazard warning lamp blinks.
6. After completing all ID registrations, press “END” to complete the procedure.
NOTE:
Be sure to register the IDs in order from FR LH, FR RH, RR RH, to RR LH, or the self-diagnostic results dis-
play will not function properly.
Measurement terminal
Item Operation or condition
+–
8 (G)
GroundTire pressure warning check
switchAlways Approx. 5 V
9 (L) Data line (CAN H) — —
11 (LG/R) Ignition switch ACC — Battery voltage (Approx. 12 V)
12 (R/W) Battery power supply Always Battery voltage (Approx. 12 V)
20 (B) GND — Approx. 0 V
21 (R) Data line (CAN L) — —
22 (G/Y) HazardHazard lamp switch OFF Battery voltage (Approx. 12 V)
Hazard lamp switch ON Approx. 0 V
24 (G/R) Ignition switch ON — Battery voltage (Approx. 12 V)
25 Antenna — —
SEIA0460E
Activation tire position Buzzer Hazard warning lamp CONSULT-II
Front LH Once
2 times flashing“YET”
↓
“DONE” Front RH 2 times
Rear RH 3 times
Rear LH 4 times

TROUBLE DIAGNOSES
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ID REGISTRATION WITHOUT TRANSMITTER ACTIVATION TOOL
1. Turn ignition switch “OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data link connector.
3. Touch “AIR PRESSURE MONITOR”, “WORK SUPPORT” and “ID REGIST”.
NOTE:
If “AIR PRESSURE MONITOR” is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC)
Circuit" .
4. Adjust the tire pressure to the values shown in the table below for ID registration, and drive the vehicle at
15 km/h (9.4 MPH) or more for a few minutes.
5. After completing all ID registrations, press “END” to complete the procedure.
Tire position
Tire pressure kPa (kg/cm2 , psi)
Front LH 250 (2.5, 36)
Front RH 230 (2.3, 33)
Rear RH 210 (2.1, 30)
Rear LH 190 (1.9, 27)
Activation tire position CONSULT-II
Front LH
“YET”
↓
“DONE” Front RH
Rear RH
Rear LH

PRECAUTION
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Revision: 2004 November 2004 FX35/FX45
PRECAUTIONPFP:00011
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
AKS007KQ
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, 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 per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Wiring Diagrams and Trouble DiagnosisAKS0056N
When you read Wiring diagrams, refer to the following:

Refer to GI-15, "How to Read Wiring Diagrams" .

Refer to PG-3, "POWER SUPPLY ROUTING CIRCUIT" for power distribution circuit.
When you perform trouble diagnosis, refer to the following:

Refer to GI-11, "How to Follow Trouble Diagnoses" .

Refer to GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident" .

FRONT WIPER AND WASHER SYSTEM
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to front wiper high relay [located in IPDM E/R (intelligent power distribution module engine room)]

through 10 A fuse [No. 84, located in IPDM E/R (intelligent power distribution module engine room)]

through IPDM E/R (intelligent power distribution module engine room) terminal 44

to front washer motor terminal 1.
Ground is supplied

to BCM terminals 49 and 52

through grounds M35, M45 and M85

to IPDM E/R terminals 38 and 60

through grounds E21, E50 and E51

to combination switch (wiper switch) terminal 12

through grounds M35, M45 and M85.
LOW SPEED WIPER OPERATION
When wiper switch is in LO position, BCM detects low speed wiper ON signal by BCM wiper switch reading
function.
BCM sends front wiper request signal (LO) with CAN communication line

from BCM terminals 39 and 40

to IPDM E/R terminals 48 and 49.
When IPDM E/R receives front wiper request signal (LO), it turns ON front wiper relay (located in IPDM E/R),
power is supplied

to front wiper motor terminal 1

through IPDM E/R terminal 21 and front wiper relay and front wiper HI relay.
Ground is supplied

to front wiper motor terminal 2

through grounds E21, E50 and E51.
With power and ground supplied, the front wiper motor operates at low speed.
HI SPEED WIPER OPERATION
When wiper switch is in HI position, BCM detects high speed wiper ON signal by BCM wiper switch reading
function.
BCM sends front wiper request signal (HI) with CAN communication line

from BCM terminals 39 and 40

to IPDM E/R terminals 48 and 49.
When IPDM E/R receives front wiper request signal (HI), it turns ON front wiper relay (located in IPDM E/R),
power is supplied

to front wiper motor terminal 4

through IPDM E/R terminal 31 and front wiper relay and front wiper HI relay.
Ground is supplied

to front wiper motor terminal 2

through grounds E21, E50 and E51.
With power and ground supplied, the front wiper motor operates at high speed.
INTERMITTENT OPERATION
Wiper intermittent operation delay interval is determined from a combination of 3 switches (intermittent opera-
tion dial position 1, intermittent operation dial position 2, and intermittent operation dial position 3) and vehicle
speed signal.
During each intermittent operation delay interval, BCM sends front wiper request signal to IPDM E/R.