Nissan GT-R. Manual — part 306

PRECAUTIONS

TM-3

< PRECAUTION >

[TRANSMISSION: GR6Z30A]

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3.

Wipe off excessive penetrant fluid, and then also lightly wipe off penetrant fluid using a wet cloth.

4.

Spray developer fluid on the checking surface.

5.

Cracks, if any, are dyed red in color.

STRAY CURRENT CORROSION

• Corrosion occurs to aluminum die-casting parts by the stray current corrosion phenomenon, when directly

contacting other parts made of steel. Always apply anti-stray current corrosion paint (primer) on the mount-
ing surface.

• Clean mounting surface to prevent any foreign matter, steel powder or others from being mixed in. Always

apply the specified adhesive when installing.

• Corrosion by stray current corrosion may occur when installing with any other bolts than the specified bolt.

Always use the specified bolt that is surface treated.

• When loosening the specified bolt that is tightened, the treated surface may peel. Never reuse the specified

bolt that is tightened once.

TIGHTENING TORQUE CONTROL

Material made of aluminum die-casting parts is soft in term of hardness. Tightening torque must be controlled
exactly as specified. Always use a torque wrench to install any part to the specified tightening torque.

WARNING:

Never use a power tool to remove or tighten bolts for aluminum die-casting part to prevent damage to
aluminum die-casting parts.

General Precautions

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• Use “Genuine NISSAN Transmission oil R35 special”.
• Work in a clean workplace.
• Avoid using cotton gloves or a waste cloth to prevent the entry of lint. Use paper towel.
• Check for the correct status prior to removal and installation, disassembly and assembly.
• Use genuine NISSAN parts for replacement.
• Do not drop foreign matter into the transmission assembly inside.
• Check for damage, breakage and twist when replacing the O-ring and gaskets, etc.
• Check that no dirt is present on the mounting area when installing the parts.
• Check that tools and shop waste cloths are not left after finishing service work.
• Check and replace the oil level with the vehicle in a horizontal position.
• Do not reuse drained transmission oil.
• Treat the replaced transmission oil and cleaning oil as waste oil.

Precautions Before Performing Diagnosis

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Check the following items before performing the diagnosis. Be careful that the applicable item may not always
be malfunctioning.

PRECAUTION FOR MECHANISM

TM-4

< PRECAUTION >

[TRANSMISSION: GR6Z30A]

PRECAUTIONS

Mechanism

Symptom

Use conditions and constraint conditions

Manual transmission base

1.

Similar to manual transmission vehicle, it adopts par-
allel axis gear, which generates collision sound. The
sound is louder than general torque converter type
automatic transmission due to reasons below.

-

Secures fairly large backlash in order to maintain lu-
brication capacity on gear surface in sport driving.

-

Adopts drysump lubrication method which enables a
stable oil supply even in sport driving.

-

Adopts light weight flywheel in order to improve ac-
celeration response.
It could rattle, clang, or make pouring noise especial-
ly after sport driving.

2.

Clicking sound can be observed at shift operation.

3.

If shift lever is changed from R to A, M or A, M to R
before vehicle stops, gear change could delay or
could not be operated.

1.

The sound becomes small if the trans-
mission oil temperature falls.

2.

—

3.

Always operate it after footing on foot
brake and confirming that the vehicle
is absolutely stopped.

Wet-type multi-plate clutch

With the vehicle stationary and the shift lever in the A

⇔

M, or R range, when the brake pedal is released, the ve-
hicle enters the status just like partial engagement of
clutch in vehicles with manual transmission to prepare for
start-up, and starts moving slowly (or in some circum-
stances, it may not start at all).

Securely depress the brake pedal while the
vehicle is stopped.

If the brake pedal and the accelerator pedal are de-
pressed simultaneously, the clutch becomes overheated
to accelerate its wear and deterioration.

Restrict the simultaneous depression of the
brake pedal and the accelerator pedal.

If the vehicle is stopped by controlling the acceleration
pedal on uphill road, the clutch will be overheated like
manual transmission vehicle, which results in transmis-
sion damage or engine stall.

When stopping on a slope, depress the
brake pedal and do not perform a stopping
operation by depressing adjustment of the
accelerator pedal.

Electronically controlled hy-
draulic control

The following symptoms may occur by oil viscosity restric-
tion variations due to temperature change.
1.

Extremely high temperature after sport driving etc or
extremely low ambient temperature can change the
oil pressure response characteristics which can
generate slip feeling or shock.

2.

At very low temperatures in winter, the system check
time may be prolonged by oil pressure response
characteristic variations.

1.

After the normal temperature is re-
sumed, the slippage feeling and shock
is reduced.

2.

During the system check, the shift le-
ver cannot be moved out from the P
position. Therefore, operate the shift
lever only after the system check indi-
cator turns off. In addition, operation
noise like a clank may be heard or the
engine speed may drop during the
system check, but they are not mal-
function.

Mode change

Since quick gear change is performed in M range, jerky
movement can be observed at start or at gear change.

—

In M range R mode, the gear change speed becomes
maximum at sport driving. Therefore, the gear change be-
comes slower at normal driving.

—

Rear final drive (mechanical
LSD)

If the vehicle accelerates from a stop with the steering
wheel widely turned in cold temperatures, the inner wheel
tire may slip and some noise or vibration may be heard.
This phenomenon occurs because the viscosity of the dif-
ferential oil becomes thicker and the Limited Slip Differen-
tial (LSD) operates with increasing strength.

When the steering wheel is returned to the
straight a head position or the differential oil
warms up, the noise and vibration de-
crease.

Transfer (E-TS)

If the vehicle accelerates from a stop with the steering
wheel widely turned in cold temperatures, it may be hard
to move the vehicle when the accelerator pedal is de-
pressed. This phenomenon is unique to AWD vehicles
and is caused by the speed difference between the front
and rear wheel. This is not a malfunction.

This phenomenon can be avoided by re-
turning the steering wheel to the straight
ahead position. The phenomenon can be
reduced if the transmission setup switch is
operated to switch to the 2WD mode only
when turning the steering wheel widely at
low speed.

PRECAUTIONS

TM-5

< PRECAUTION >

[TRANSMISSION: GR6Z30A]

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PRECAUTIONS FOR SYMPTOM

Lightweight flywheel

The application of light fry wheels enables engine re-
sponses to accelerator operation. Therefore, engine
speed varies widely, compared with conventional vehicles
and this may generate a rattling sound or chattering
sound.

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At the engine start or stop, a rattle may be heard.

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Mechanism

Symptom

Use conditions and constraint conditions

Symptom

Cause

Action

When or after
the engine
starts

The shift lever is not released from the P
range.

The system performs the system check of
transmission after the engine starts. There-
fore, the shift lever is not released from the
P range by shift lock even if the driver de-
presses the brake during the check. This is
normal. The system check time may be pro-
longed at low oil temperature.

Wait until the system
check finishes.

The vehicle cannot be driven after starting
the engine at the N range.

When the engine starts at the N range after
the engine stops at the driving range (A/M
or R range), the vehicle may not start for
safety. This is normal.
• Conditions that the vehicle cannot be

driven

- The engine starts at the N range after

stopping at the A/M range, and the R
range is selected

- The engine starts at the N range after

stopping at the R range, and the A/M
range is selected

If the engine starts at the
N range, the vehicle can
be driven by selecting
the desired driving
range after selecting the
P range once. Perform
the engine stop or start
at the P range for safety
reasons.

The gear shift takes time at low oil temper-
ature.

The oil viscosity is high and the oil flow re-
striction is large at low oil temperature, and
the oil pressure response takes time.

Smooth gear shift is re-
sumed, when the oil
temperature increases.

The engine speed fluctuates when the shift
lever shifts from the N range or P range to
the driving range (A/M, R range) without the
brake pedal depressed.

If the shift lever shifts to the driving range
(A/M or R range) without the brake pedal
depressed, the clutch becomes the partial
clutch engagement status simultaneously
with the gear engagement. Therefore, the
engine load changes. As a result, the en-
gine speed may vary or decrease.

Securely depress the
brake before shifting the
shift lever to the driving
range (A/M, R range) for
safety reasons.

The vehicle cannot start at any gears higher
than 2GR.

The gear position that the vehicle can start
is only 1GR and reverse gears. The vehicle
cannot start at any gears higher than 2GR
because the load for the clutch is too great.

Start the vehicle in 1GR
or reverse gear. On a
slippery road, use SAVE
mode of the A range.

TM-6

< PRECAUTION >

[TRANSMISSION: GR6Z30A]

PRECAUTIONS

The gear shift is
not performed
or slow.

No manual upshift is accepted during start-
up.

The manual shift change is inhibited in or-
der to reduce the load to the clutch during
start-up (until the clutch is engaged).

Shift the gear only after
the start-up is finished
(after the clutch is en-
gaged).

Shift-down to 1GR is denied during the
drive in 2GR.

Speed reduction during the drive in 2GR
causes partial clutch engagement to pre-
vent engine stall. Therefore, shift-down to
1GR is denied.

To shift down to 1GR,
depress the brake pedal
and stop the vehicle or
accelerate to escape
from 2GR partial clutch
engagement.

The gear shift takes time at low oil temper-
ature.

The oil viscosity is high and the oil flow re-
striction is large at low oil temperature, and
the oil pressure response takes time.

Smooth gear shift is re-
sumed when the oil tem-
perature increases.

The gear shift is not performed even if the
paddle shifter operation is performed.

• The paddle shifter operation can be per-

formed only in the M range.

• If the engine over revving occurs or the

specified engine speed is not reached af-
ter a gear shift, the gear shift is inhibited,
and the shift position indicator on the
combination meter blinks to warn the
driver.

Use the M range and
perform gear shift at the
proper engine speed.

Symptom

Cause

Action