torque INFINITI M35 2007 Factory Service Manual

TF-10
AWD SYSTEM
Revision: 2007 April2007 M35/M45
AWD SYSTEMPFP:41650
Power Transfer DiagramNDS000DB
System DescriptionNDS000DC
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 the shift occasionally changes
to direct 4-wheel driving conditions automatically. This is not malfunction.
SDIA1611E

AWD SYSTEM
TF-11
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Revision: 2007 April2007 M35/M45
ELECTRIC CONTROLLED COUPLING
Operation Principle
1. AWD control unit supplies command current to electric controlled coupling (AWD solenoid).
2. Control clutch is engaged by electromagnet and torque is detected in control clutch.
3. The cam operates in response to control clutch torque and applies pressure to main clutch.
4. Main clutch transmits torque to front wheels according to pressing power.

Transmission torque to front wheels is determined according
to command current.
AWD CONTROL UNIT

Controls distribution of drive power between rear-wheel drive
(0:100) and AWD (50:50) conditions according to signals from
sensors.

Self-diagnosis can be done with CONSULT-II.
SDIA2270E
SDIA1844E
SDIA3133E

TF-12
AWD SYSTEM
Revision: 2007 April2007 M35/M45
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 DiagramNDS000DD
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
SDIA3134E

TF-14
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSISPFP:00004
Fail-Safe FunctionNDS000DF

If any malfunction occurs in AWD electrical system, and control unit detects the malfunction, AWD warn-
ing 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 DiagnosisNDS000DG
BASIC CONCEPT

To perform trouble diagnosis, it is the most important to have understanding about vehicle systems (con-
trol 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
customer.
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
interview 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 with-
out any symptom diagnosis, you cannot judge if malfunctions
have actually been eliminated.

After completing diagnosis, always erase diagnostic memory.
Refer to TF-22, "
How to Erase Self-Diagnostic Results" .

For intermittent malfunctions, move harness or harness connec-
tor by hand. Then check for poor contact or reproduced open circuit.
SEF233G
SEF234G

TF-20
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Trouble Diagnosis Chart for SymptomsNDS000DK
If AWD warning lamp turns ON, perform self-diagnosis. Refer to TF-22, "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 ValuesNDS000DL
AWD CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Symptom Condition Check item 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-33
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-33
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-35Accelerator 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 drivingCAN communication line
TF-36
AWD solenoid
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-37
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-37
Monitor 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
TF-37
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Revision: 2007 April2007 M35/M45
3. CHECK AWD SOLENOID
Check AWD solenoid. Refer to TF-30, "
COMPONENT INSPECTION" .
OK or NG
OK >> GO TO 4.
NG >> Replace electric controlled coupling for malfunction of AWD solenoid. Refer to TF-45, "
Disassem-
bly and Assembly" .
4. CHECK AWD CONTROL UNIT
Check AWD control unit input/output signal. Refer to TF-20, "
AWD Control Unit Input/Output Signal Reference
Va l u e s" .
OK or NG
OK >> GO TO 5.
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.
5. SYMPTOM CHECK
Check again.
OK or NG
OK >>INSPECTION END
NG >> Replace electric controlled coupling for mechanical malfunction (mechanical engagement of
clutch is not possible.). Refer to TF-45, "
Disassembly and Assembly" .
While Driving, AWD Warning Lamp Flashes Rapidly (When Flashing in Approx.
1 Minute and Then Turning OFF)
NDS000DY
NOTE:
Rapid flashing: 2 times/second
This symptom protects drivetrain parts when a heavy load is applied to the electric controlled coupling and
multiple disc clutch temperature increases. Also, optional distribution of torque sometimes becomes rigid
before lamp flashes rapidly. Both cases are not malfunction.
When this symptom occurs, stop vehicle and allow it to idle for some times. Flashing will stop and system will
be restored.
While Driving, AWD Warning Lamp Flashes Slowly (When Continuing to Flash
until Turning Ignition Switch OFF)
NDS000DZ
NOTE:
Slow flashing: 1 time/2 seconds
DIAGNOSTIC PROCEDURE
1. CHECK TIRE
Check the following.

Tire pressure

Wear condition

Longitudinal tire size (There is no difference between longitudinal tires.)
OK or NG
OK >> GO TO 2.
NG >> Drive at vehicle speed of 20 km/h (12 MPH) or more for 5 seconds or more after repairing or
replacing damaged parts. (Initialize improper size tire information.)

TF-42
REAR OIL SEAL
Revision: 2007 April2007 M35/M45
INSTALLATION
1. Apply ATF to rear oil seal, install it with a drifts.
CAUTION:

Do not reuse rear oil seal.

When installing, do not incline rear oil seal.
2. Align the matching mark of mainshaft with the mark of compan-
ion flange, then install the companion flange.
3. Using a flange wrench, install the self-lock nut of companion
flange and tighten to the specified torque. Refer to TF-45,
"COMPONENTS" .
CAUTION:
Do not reuse self-lock nut.
4. Install the rear propeller shaft. Refer to PR-6, "
REAR PROPEL-
LER SHAFT" .
5. Check fluid level. Refer to TF-9, "
Inspection" . Dimension A : 6.7 - 7.3 mm (0.264 - 0.287 in)
Tool number A: ST30720000 (J-25405)
B: KV40104830 ( — )
PDIA0292E
SDIA2378E
PDIA0245E

TF-44
TRANSFER ASSEMBLY
Revision: 2007 April2007 M35/M45
TRANSFER ASSEMBLYPFP:33100
Removal and InstallationNDS000E4
REMOVAL
1. Remove exhaust front tube with power tool. Refer to EX-3, "EXHAUST SYSTEM" .
2. Remove front and rear propeller shaft. Refer to PR-4, "
FRONT PROPELLER SHAFT" and PR-6, "REAR
PROPELLER SHAFT" .
3. Disconnect transfer assembly harness connector and separate harness from transfer assembly.
4. Remove air breather hose. Refer to TF-43, "
AIR BREATHER HOSE" .
5. Remove control rod. Refer to AT- 2 2 6 , "
Control Rod Removal and Installation" .
6. Support transfer assembly and transmission assembly with a jack.
7. Remove rear engine mounting member and engine mounting insulator with power tool. Refer to EM-114,
"ENGINE ASSEMBLY" .
8. Lower jack to the position where the top transfer mounting bolts
can be removed.
9. Remove transfer mounting bolts with power tool and separate
transfer from transmission.
CAUTION:
Secure transfer assembly and transmission assembly to a
jack.
INSTALLATION
Note the following, and install in the reverse order of removal.

When installing the transfer to the transmission, install the
mounting bolts following the standard below.

After the installation, check the fluid level, fluid leakage and the
A/T positions. Refer to TF-9, "
Inspection" ,AT- 2 2 7 , "Adjustment
of A/T Position" .
PDIA0560J
Bolt No. 1 2 3 4
Quantity 4 3 2 1
Bolt length “ ” mm (in)75 (2.95) 45 (1.77) 40 (1.57) 30 (1.18)
Tightening torque
N·m (kg-m, ft-lb)37 (3.8, 27)
SDIA2284E

TRANSFER ASSEMBLY
TF-53
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Revision: 2007 April2007 M35/M45
Mainshaft Assembly
1. Install needle bearing to mainshaft.
CAUTION:
Apply ATF to periphery of needle bearing.
2. Install sprocket and electric controlled coupling to mainshaft.
3. Install spacer to main shaft.
4. Install snap ring to mainshaft.
CAUTION:
Do not reuse snap ring.
5. Install mainshaft assembly to rear case, then install front case
and rear case. Refer to TF-53, "
Front Case and Rear Case" .
Front Case and Rear Case
1. Install breather tube, with plastic hammer.
CAUTION:
Pay attention to the direction of breather tube.
2. Install baffle plate to rear case, and tighten bolt to the specified
torque. Refer to TF-45, "
COMPONENTS" .
3. Install rear bearing to rear case, using the drift.
CAUTION:
Apply ATF to inside of rear bearing.
PDIA0273E
SDIA1602E
PDIA0274E
Tool number : KV38104010 ( — )
PDIA0275E

TF-54
TRANSFER ASSEMBLY
Revision: 2007 April2007 M35/M45
4. Install snap ring to rear case.
CAUTION:
Do not reuse snap ring.
5. Install mainshaft assembly to rear case, using the drift.
CAUTION:
ATF should be applied to contact surface of mainshaft and
rear bearing.
6. Install O-ring to transfer assembly harness connector.
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
7. Install transfer assembly harness connector into rear case.
8. Install retainer to transfer assembly harness connector.
9. Set temperature sensor and tighten bolt to the specified torque.
Refer to TF-45, "
COMPONENTS" .
10. Hold electric controlled coupling harness with oil cover hold
plate, install oil cover to rear case, and tighten bolt to the speci-
fied torque. Refer to TF-45, "
COMPONENTS" .
CAUTION:
The harness should be guided by a cut portion.
NOTE:
Regarding models after december ′06, temperature sensor may
not included.
PDIA0263E
Tool number : ST35321000 ( — )
SDIA2368E
SDIA1597E
SDIA2404E