wheel torque NISSAN GT-R 1998 Service Manual

TROUBLE DIAGNOSES
Symptom Matrix Chart (Cont'd)
Sensor-related problems I Symptom characteristics and ins~ection hints
Open Engine
will not start when either REF signal circuit or POS signal circuit is open.
Neither fuel system nor ignition system outputs control signals.
Crankshaft position sensor
(POS, REF) Instanta-
neous break Symptoms
vary with the break time and the vehicle's driving conditions. Light
shock or surging will occur while the vehicle is being driven, and the engine will
stall at idle speed.
Ring gear crankshaft position
sensor
[RB20DE
(UB)]
Signal
Mass air flow sensor Open
Open
High output
Low output I Aidfuel
ratio becomes lean. Dirty hot wire or air entering the system could be the
cause. No
airfluel ratio compensation
is carried out during lean bum status. Drivability
may be affected.
Enters fail-safe mode. Driving under
2,400 rpm is allowed.
Airlfuel
ratio becomes rich. Black smoke may be noted. Poor contact at the
ground could be the cause.
Engine coolant temperature sen-
sor Open
Open
Opedshort
High resis-
tance
Low resis-
tance
Opedshort
Heated oxygen sensor
I
Airlfuel ratio becomes over-rich.
Same symptom as when signal wire is open.
Enters fail-safe mode. Malfunction indicator lamp comes ON. Ordinary driving is
allowed. Problems tend to occur when engine is cold or engine coolant tempera-
ture
is high.
Detects low engine coolant temperature. Problems tend to occur after engine
warm-up.
Detects high engine coolant temperature. Problems tend to occur when engine is
cold.
Base
aidfuel ratio is used.
lgnition timing is retarded within the knock control range. Lack of power may be
OpedShort
I noted.
Knock sensor lgnition
timing is retarded within the knock control range. Lack of power may be
High
Output
(noted.
Low output
1 lgnition timing may not be retarded when knock is detected.
Vehicle speed sensor
Throttle position sensor
Opedshort
Opedshort
Unstable out-
put
Poor adjust-
ment
Open
Turbo pressure sensor
(TE) Fuel
cut time becomes-shorter, or no fuel cut is observed.
Base idle speed is used. Fuel injection is not increased during acceleration.
AIT shift point changes for AfF vehicles.
Unnecessary cut-in fuel injection could be the cause. Poor contact at the ground
or control unit could be the cause.
ldle judgment is "OFF while idling. Condition returns
normal by turning the igni-
tion switch ON and OFF repeatedly.
Turbo pressure is judged zero. No remarkable malfunction will be detected.
Refrigerant pressure is judged high. ldle speed remains high while the air condi-
tioner is ON.
Refrigerant pressure sensor
Short Refrigerant pressure
is judged low. ldle speed remains low while the air condi-
tioner is ON.
lgnition switch (IGN)
lgnition switch (START)
Air conditioner switch Open
Engine
will not start because neither fuel system nor ignition system outputs con-
trol signals.
Engine starts in normal condition. Engine may not start when temperature is
extremefy
low.
Air conditioner will not operate. No other malfunction will be noted.
Park/neutral
position switch is judged "OFF. Target engine speed for cold engine
in
N or P position is reduced.
ParWneutral position switch is judged
"0N"I Fast Jdle is effective when the engine
is cold and the gear is in other than N and P posrtlons. Vehrcle excessrvely
creeps.
Open
Open
Parklneutral
position
switch
Short
Power steering oil pressure
switch Open
Engine may
stall when the steering wheel is turned while the vehicle is standstill
and the accelerator pedal is lightly pressed, or when the steering wheel is turned
Electrical load switch Short
Open
Open/short
Multiplex communication line
- -- during deceleration. '
Power steering switch is judged 'ON." Value will be compensated constantly.
Idle speed drops so that the engine can stall when electrical load is applied.
Torque reduction control is not performed. Therefore,
shift shock becomes
greater.
- -- -- -- -- Engine will not start because neither fuel system nor ignition system outputs con-
trol signals.
Open
Control unit power supply
- -- - - --- - - - - - O~edshort I Same symptoms as when sensor harness is open.
Sensor ground -- - Poor contact
Water intru-
sion - -- - - - - - -- -- In case of poor contact, the connector fitting may be loose. In case of water
intrusion, the engine stalls and become inoperative for a while. The engine may restart soon in some cases.
Control unit
and connector

TCSIABS SYSTEM
System
Description
ABS FUNCTION
During ABS operation, the brake pedal pulsates along with a mechanical noise. This ensures that the ABS
is working properly. mP
When starting up the engine or immediately after the vehicle starts to run, the brake pedal pulsates and G'
a motor noise from the engine compartment can be heard. They are caused by the ABS operation check
and should not be considered abnormal.
A vehicle with the ABS may stop in a longer distance than a vehicle without the ABS when the brake is
EC
applied on a bad road, gravel road, or deep fresh snow.
TCS FUNCTION
TCS/ABS control unit monitors the speed of the driving wheels through 4 wheel speed sensors. If driving
wheel slip is detected, fuel to the engine is cut
ol
and the throttle valve is adjusted so that the engine
a
torque is reduced. On vehicles with automatic transmission, transmission shift schedule is also changed
to control the rear wheel driving torque, which results
in the reduction of wheel slip. This system enables
the throttle valve to be controlled so that optimum engine torque can be achieved in accordance with the
driver's acceleration request.
The driver may not feel satisfied with acceleration on some road surfaces. This poor acceleration occurs
because the operating TCS gives priority to maintaining optimum traction. Therefore, this condition should
R8
be considered normal.
When shiftdown is made or the acceleration pedal is depressed while the vehicle is driven on the road
surface that has different friction coefficients, the TCS may operate temporarily.
r-- 4 Lrd[-i
On vehicles with manual transmission, the SLlP indicator lamp and the TCS OFF indicator lamp may light
up when the engine is about to stall in the conditions shown below.
If the lamps go off when engine speed
increases, there is no problem in the system.
At start, the engine almost stalls and the engine speed is much lower than the idle speed.
The vehicle is driven at an extremely low speed with a high-speed gear engaged.
The clutch has been engaged until the vehicle almost stops. 8D
FAIL-SAFE FUNCTION
ABS system
If any malfunction is detected in the system, the ABS warning lamp, the TCS OFF indicator lamp and the SLlP
indicator lamp in the instrument panel is turned on with the TCSIABS deactivated and the vehicle's brake sys-
tem reverts to normal operation.
TCS system
If any malfunction is detected in the system, both the SLlP indicator lamp and the TCS indicator lamp on the
instrument panel light up and the TCS is shut down. The vehicle operates in the same manner as a vehicle
without the
TCS, while the ABS is operational.
If there is a malfunction in the throttle control system, the TCS becomes inoperative while the ABS
remains functional.
When fail-safe operation is activated, perform the self-diagnosis procedure for the TCSIABS first.
Refer to
BR-27 for details.

ENGINE MECHANICAL [ RB20DE (UB) 1
TIGHTENING TORQUE
Unit: N.m (kg-m)
Engine cover
Throttle body
Throttle position sensor
IAA unit (ACC valve)
lntake manifold collector
(upper)
Intake manifold collector
Intake manifold
Vacuum tank
Engine coolant temperature
sensor
- --
' Fuel tube
Pressure regulator
Fuel damper
Fuel hose clamp bolt
(in engine compartment)
Exhaust manifold cover
' Exhaust manifold
Oxygen sensor
Crank pulley
Cam pulley (INT)
Cam pulley
(EXH)
Timing belt cover
Timing belt rear cover
Tensioner pulley
Idler pulley
Crankshaft position sensor
' Oil pan
Oil strainer
Oil pan drain plug
ignition coil
Spark plug
* Rocker cover
Camshaft bracket
Camshaft baffle plate 5.1
- 6.5 (0.52 - 0.66)
20
- 29 (2.0 - 3.0)
1) 5.5 - 7.5 (0.56 - 0.76)
?) 5.5 - 7.5 (0.56 - 0.76)
:Tighten separately in twice.)
Cylinder head bolt
Cylinder head sub bolt
VTC solenoid
' Main bearing cap
Connecting rod nut
Flywheel and drive plate
Engine coolant drain plug
Knock sensor
Radiator mounting bracket
Auxiliary electric fan
Water pump (M6 bolt)
(M8 bolt)
(MI 0 bolt)
Water inlet
Oil pump assembly
Accelerator cable
lock nut
Fuel tank strap
Fuel sender unit lock
ring
Exhaust manifold to front
tube Front tube to catalytic
converter Catalytic converter to cent
tube Center tube to main
muffler
Alternator (main)
(stay side)
Starter motor Unit:
N-m (kg-m)
1)
29 (3.0)
2) 98 (10.0)
3)
0
(0)
4) 25
- 34 (2.5 - 3.5) GI
5) 95" - 100"
(Angle tightening)
Ec
9.0 - 12 (0.92 - 1.2)
25
- 34 (2.5 - 3.5)
49
- 59 (5.0 - 6.0) h$7'
1) 14 - 16 (1.4 - 1.6)
2) 45"
- 50"
(Angle tightening)
BW
93 - 103 (9.5 - 10.5)
34 - 44 (3.5 - 4.5)
25
- 34 (2.5 - 3.5) ST
': Tighten as specified tightening order.
1): Tighten separately in several times.

ENGINE MECHANICAL
TIGHTENING TORQUE
Engine cover
' Throttle body
Throttle position sensor
IAA unit (ACC valve)
' Intake manifold collector
(upper)
' Intake manifold collector
Intake manifold
Vacuum tank
Engine coolant temperature
sensor
' Fuel tube
Pressure regulator
Fuel damper
Fuel hose clamp bolt
(in engine compartment)
Exhaust manifold cover
Exhaust manifold
Oxygen sensor
Crank pulley
Cam pulley (INT)
Cam pulley
(EXH)
Timing belt cover
Ttming belt rear cover
Tensioner pulley
Idler pulley
Crankshaft position sensor
' Oil pan
Oil strainer
Oil pan drain plug
Ignition coil
Spark plug
Rocker cover
* Camshaft bracket
Camshaft baffle plate Unit:
Nm (kg-m)
5.0
- 6.5 (0.51 - 0.66)
1) 8.8
- 11 (0.9 - 1.1)
2) 18
- 22 (1.8 - 2.2)
2.0
- 2.4 (0.20 - 0.24)
8.4
- 11 (0.86 - 1 .I)
18
- 22 (1.8 - 2.2)
5.1
- 6.5 (0.52 - 0.66)
20
- 29 (2.0 - 3.0)
1) 5.5 - 7.5 (0.56 - 0.76)
2) 5.5 - 7.5 (0.56 - 0.76)
:Tighten separately in twice.)
Cylinder head bolt
Cylinder head sub bolt
VTC solenoid
Main bearing cap
Connecting rod nut
Flywheel and drive plate
Engine coolant drain plug
Knock sensor
Radiator mounting bracket
Auxiliary electric fan
Water pump
(M6 bolt)
(M8 bolt)
(M 1 0 bolt)
Water inlet
Oil pump assembly
-
Accelerator cable lock nut
Fuel tank strap
Fuel sender unit lock
ring
Exhaust manifold to front
tube
Front tube to catalytic
converter
Catalytic converter to center
tube Center tube to main
muffler
Alternator (main)
(stay side)
Starter motor Unit:
N.m (kg-m)
1) 29 (3.0)
2) 98 (10.0) 3) 0 (0)
@
4)
25 - 34 (2.5 - 3.5)
5) 95" - 100"
(Angle tightening)
E
9.0 - 12 (0.92 - 1.2)
25
- 34 (2.5 - 3.5) j$? 49 - 59 (5.0 - 6.0)
1) 14- 16
(1.4- 1.6)
2) 60"
- 65" BR
(Angle tightening)
93
- 103 (9.5 - 10.5)
34 - 44 (3.5 - 4.5)
25
- 34 (2.5 - 3.5) a=
': Tighten as specified tightening order.
1): Tighten separately in several times.

ENGINE MECHANICAL pEZBq
TIGHTENING TORQUE
Engine cover
' Throttle body
Throttle position sensor
IAA unit
(ACC valve)
' Intake manifold collector
* Intake manifold
Engine coolant temperature
sensor
' Fuel tube
Pressure regulator
Fuel damper
Fuel hose clamp bolt
(in engine compartment)
Turbocharger Oil tube
Water tube (block side)
(turbocharger side)
Oxygen sensor
Exhaust manifold cover
' Exhaust manifold
Crank pulley
Cam pulley (INT)
Cam pulley
(EXH)
Timing belt cover
Timing belt rear cover
Tensioner pulley
Idler pulley
Crankshaft position sensor
' Oil pan
Oil strainer
Oil pan drain plug
Ignition coil
Spark plug
' Rocker cover
' Camshaft bracket
Camshaft baffle plate Unit:
N.m (kg-m)
5.0
- 6.5 (0.51 - 0.66)
1)
8.8
- 11 (0.9 - 1.1)
2)
18
- 22 (1 -8 - 2.2)
2.0
- 2.4 (0.20 - 0.24)
8.4
- 11 (0.86 - 1.1)
18
- 22 (1.8 - 2.2)
18
- 22 (1 -8 - 2.2)
20
- 29 (2.0 - 3.0)
5.1
- 6.5 (0.52 - 0.66)
20
- 29 (2.0 - 3.0)
1) 5.5
- 7.5 (0.56 - 0.76)
2) 5.5 - 7.5 (0.56 - 0.76)
(Tighten separately in twice.)
' Cylinder head boit
Cylinder head sub bolt
VTC solenoid
" Main bearing cap
Connecting rod
nut
Oil jet
Flywheel and drive plate
Engine coolant drain plug
Knock sensor
Radiator mounting bracket
Auxiliary electric fan
Water pump (M6 bolt)
(M8 bolt)
(MI
0 bolt)
Water inlet
Oil pump assembly
Accelerator cable lock nut
Fuel tank strap
Fuel sender unit lock
ring
Exhaust manifold to front
tube
Front tube to catalytic
converter
Catalytic converter to center
tube
Center tube to main
muffler
Alternator (main)
(stay side)
Starter motor Unit:
N.m (kg-m)
1) 29 (3.0)
2) 98 (10.0)
3) 0 (0)
4) 25 - 34 (2.5 - 3.5)
5) 95"
- 100"
(Angle tightening)
I%
9.0 - 12 (0.92 - 1.2)
25
- 34 (2.5 - 3.5)
49
- 59 (5.0 - 6.0) AT
1) 14 - 16 (1.4 - 1.6)
2) 60" - 65"
(Angle tightening) BR
30 - 40 (3.1 - 4.1)
93
- 103 (9.5 - 10.5)
34 - 44 (3.5 - 4.5) ST
25 - 34 (2.5 - 3.5)
3.8
- 4.5 (0.39 - 0.46) I%$
5.1 - 6.5 (0.52 - 0.66)
17
- 21 (1.7 - 2.1)
20
- 23 (2.0 - 2.3) kIA
35 - 47 (3.6 - 4.8)
16
- 21 (1.6 - 2.1)
9.0
- 12 (0.92 - 1.2) a=
': Tighten as specified tightening order.
1): Tighten separately in several times.

DRIVE SHAFT
FRONT REAR
Z80T70C
Spider 1 00 1 39720 51E00 I
Joint type
Amount of grease
Boot length at installed mm
I I
I
'lamped number
assembly (final drive side) 0 1
39720
51 EO1 T7fP
Parts number
Final drive side
Wheel side
Final drive side
Wheel side
Final drive side
Wheel side T70C
Z80
11 0
- 120
75
- 85
95.5
- 97.5
90.5
- 92.5
T82CT82F
assembly 39720 lOVl0
(final drive and
wheel sides) 39720
1OV11 T82C
T82F
39720 10V12 Joint type
Amount of grease
Boot length at installed mm
Spider
Joint type Final drive side
Wheel side Final
drive side
Wheel side
Final drive side 'wheel side
Final drive side
. Wheel side
Stamped number
Amount of grease T82F
T82C
102
- 107
115
- 125
95
- 97
Wheel side 75 - 85 Parts number
Boot length at installed
Wheel side 90.5
- 92.5 TYP~
I Stamped 1 Parts
number I Type
number Joint
type
Wheel side
Amount of grease g
Spider
assembly
(final drive side) Boot length
at
installed
mm
00
01
I Drive shaft nut
Front
TIGHTENING
TORQUE
Unit: N-m (ka-m)
Final drive side
Wheel side
39720lOVlO
39720 1
OV11
Drive shaft nut 92.9 - 94.9
96.0
- 98.0
T82
F Drive
shaft
to side flange (left side)
;
Rear 28
- 37
(2.8 - 3.8)
T82CT82F
35
- 44
Drive shaft to side
flange
Z100D90F
(6.5 - 8.0)

AXLE & SUSPENSION
WHEEL ALIGNMENT -
1 Camber I -0°45'-t45'
[caster
1 6"35'+45'
I Amount of side slip (Reference)(Only for HICAS)
mm I In 5 to Out 5
WHEEL BEARING
- -
12"50'-t45' GI
0 to In 2
In
5 to Out 5
-0°55'&30' EG
0 to Out 5.2
Front
Rear
- -
Location T Front axle
r- King pin inclination
Toe-in mm
Amount of side slip (Reference)
mm
Camber
Toe-in rnm
Applied model
I 2WD
Rotating torque
N.m
(kg-m)
Spring scale set position Less than
2.45 (0.25)
(NSK make)
Less than 3.33 (0.34)
(NTN make)
Spring scale measurement
N (kg) Without
SUPER HICAS
Less than
15.9 (1.63)
(NSK make)
Less than 21.6 (2.21)
(NTN make) Rear
axle
0.30
- 1 .I7 (0.03 - 0.12)
(NSK make)
0.520
- 1.882 (0.053 - 0.192)
(NTN make)
5.0
- 21 (0.5 - 2.2)
(NSK make)
2.95
- 10.5 (0.30 - 1 .O8)
(NTN make)
End play
mm l 0 With
SUPER HICAS
BALL JOINT
Oscillating torque N-m (kg-m)
Spring scale measurement (at cotter pin hole)
N (kg)
Sliding torque
N.m
(kg-m)
End play mm 0.50
- 3.40
(0.05 - 0.35)
7.95
- 55.3 (0.81 - 5.64)
0.50
- 3.40 (0.05 - 0.35)
0

ROAD WHEEL AND TIRE
Dynamic Less than
10 (one side)
ROAD WHEEL
I G.JIUUOL imbalance
Less than 20
-- Wheel nut tightening torque
I
103 - 122
N.m
(kg-m)
(10.5 - 12.5) Steel
Less than 0.8
Less than
0.5
TIGHTENING TORQUE
Unit: N.m (kg-m)
Aluminum
Less than 0.3
Less than
0.3
Wheel type
Wheel nut 1 103 - 122 (10.5 - 12.5)
Runout limit mm
TIRE
Vertcal
Tire size Tire
air pressure kPa (kg/cm2) Front wheel 1 Rear
wheel

BRAKE
BRAKING FORCE
More than 10% of axle
weight
REAR DlSC BRAKE
Total braking force of rear wheels
Variation between right and left of
each wheel Brake
type
Less than 8% of axle weight ADllVC
9.3
Brake
pad
Disc rotor
Total
braking force OPZ11V
11.5
Standard
thickness (New) mm
Wear limit of thickness mm
Standard thickness (New) mm
Wear limit of thickness mm
Runout limit mm
More than 50%
of vehicle
weight at inspected
Note: The braking force when both front wheels are locked up can be considered to meet the total braking force.
2.0
16
14
BRAKE PEDAL
18
16
PARKING BRAKE
Free play (at pedal top surface)
mm I 3 - 11 Less than
0.07 Type DS17HD I
Brake
lining
Depressed pedal height under force
of 490 N (50 kg)
(from dash panel top surface)
mm
Brake
pedal height
(from dash panel top surface)
mm
Standard inner diameter
I (New) mm I
Standard thickness (New) mrn
Wear limit of thickness
mm M/T: 163 - 173 IVT: 170 - 180
172 dia. 3.0 1.5
M/T: More
than 85 A. More than 90 . . Drum I
I
Wear limit of inner diameter
mm I 173 dia.
Clearance between the edge of stop
lamp switch screw and pedal stopper
mm Operating
stroke
[under force of 196 N (20
kg)] 5 - 7 notches
CHECK VALVE I
I
Maximum stroke
19 notches
Number of notches when brake warning
lamp turns on
TIGHTENING TORQUE
Unit: N.m (kg-m)
Within 1 notch
Vacuum leakage
[at
vacuum Of 66'7 kPa (-500 mmHg)]
BRAKE BOOSTER
Within 1.3 kPa (10 mmHg) of
vacuum for 15 seconds
Master cylinder fixing nut
I 12 - 14 (1.2 - 1.5)
Vacuum leakage
[at vacuum of 66.7
kPa
(-500
mmHg)l
Within 3.3
kPa
(25
mmHg)
of
vacuum for 15 seconds Front
caliper mounting bolt
Brake tube flare nut -- - 152 - 154 (15.5 - 15.8)
15
- 17 (1.5 - 1.8)
FRONT DlSC BRAKE
Input rod standard length at installed
mm
Brake type
I AD25VB I CUSVD [OPZ~~VC
140
Standard thickness
Wear limit of
thickness
Standard thickness
mm
1 22 1 26 1 30
Disc rotor Wear limit of
thickness
Runout
limit Less than 0.07

STEERING
STEERING GEAR STEERING WHEEL
Steering wheel end play rnm -- -
Steering wheel free play rnm1 0-35 0
Steering gear type
Rack neutral position "L" mm
Amount of steering gear housing movement mm
I Within 22 PR29, PR26AD, PR26AF
68.5
STEERING
ANGLE
STEERING COLUMN
Inner wheel
Outer wheel 42"
33"
STC0101
D 88
Primary tightening torque 5.0 - 5.8 8T
Steering column length "L" mm
Retainer
adjustment
61
0
Re-tightening torque after loosening
once 5.0
- 5.8 Rs N.m (kg-m) (0.5 - 0.6)
MA
Range
within ill .5 mm from
STEERING LINKAGE Less than 98.0 EL (1 0.0)
(30.0)
Full range
Rack
sliding
force
Steering gear type
Oscillating torque 0.30
- 2.94
Nm
(kg-m)
(0.03 - 0.30) variations Less
than 147
Spring scale measurement
(at stud bolt hole) 6.48
- 64.6
N
(kg)
(0.66 - 6.59)
Tie-rod
ball joint
outer socket OIL PUMP Sliding torque 0.30 - 2.94
End play
Oscillating torque
1 .O - 7.8
Maximum oil pump pressure
MPa (kg/cm2) 8.822: (90)
(Without HICAS)
7.842:; (80)
(With HICAS)
STEERING FLUID Tie-rod ball joint
inner socket Spring
scale measurement (at
arrow position in figure below) 19.0 - 152
N (kg) (1.90 - 15.5)
Fluid capacity P I Approx. 1.0
End play mm Less than 0.2
mm 173.3
TIGHTENING TORQUE Tie-rod length "L"
Unit: N.m (kq-m)
Steering wheel nut
Steering gear to suspension member
Hydraulic tube (high pressure side) to oil
/ 50 - 68 (5.0 - 7.0)
Pump
30
- 39
(3.0 - 4.0)
89
- 91 (9.0 - 9.3)
24
- 29 (2.4 - 3.0)
30
- 39 (3.0 - 4.0)
79
- 98 (8.0 - 10.0)
32 - 42 (3.2 - 4.3)
14
- 17 (1.4 - 1.8)
Steering gear
to steering column
Outer socket to steering knuckle
Tie-rod lock nut
Oil pump fixing bolt
Hydraulic tube to
steering gear Large
Small
High pressure side
Low pressure side 15
- 24 (1.5 - 2.5)
28
- 39 (2.8 - 4.0)