tire pressure NISSAN GT-R 1998 Service Manual

ANTI-LOCK BRAKE SYSTEM
ABS control unit connector
Terminal No.
Control Unit InputlOutput Signal Specifications
USING CIRCUIT TESTER
To perform the following inspection, the ignition switch should be
turned
ON with ABS control unit connector and actuator connector
properly connected.
Item Specifications*l
Battery Ignition switch ON: Battery voltage (Approx. 12V)
Brake pedal is depressed: Battery voltage (Approx. 12V)
Stop lamp signal
Brake pedal is not depressed: Less than approx.
2V
ABS motor is running
ABS motor relay (in
CONSULT active test mode): Less than approx.
2V
ABS motor is stopped: Battery voltage (Approx.
12V)
Actuator relay is activated (with engine running): Less than approx. 2V
Actuator relay Actuator
relay is not activated (with fail-safe function activated and engine
not running): Battery voltage (Approx. 12V)
Actuator relay is activated (with engine running): Battery voltage (Approx.
Actuator relay 1 2V)
monitor Actuator
relay is not activated (with fail-safe function activated and engine
not running): Approx. OV
Front
right inlet
Actuator is activated (in CONSULT active test mode), or actuator relay is
solenoid not activated (with fail-safe function activated and engine not running):
Rear inlet solenoid Approx. OV
Front
left inlet Actuator
is not activated and actuator relay is activated (with vehicle
solenoid stopped
and engine running): Battery voltage (Approx. 12V)
ABS motor is running (in CONSULT active test mode): Battery voltage
ABS motor monitor (Approx. 12V)
ABS motor is stopped (with ignition switch
ON): Approx. OV
ABS warning lamp
ON'2:
Approx. OV
ABS warning lamp
ABS warning lamp
OFF'2:
Battery voltage (Approx. 12V)
Front right wheel
sensor Wheels are turning (Approx. 30
krn/h)*3: Pulse generates.
Front: Approx. 200
Hz
sensor
Rear: Approx. 400 Hz
Front right outlet
Actuator is activated (in CONSULT active test mode), or actuator relay is
not activated (with fail-safe function activated and engine not running):
Rear outlet
sole-
Approx. OV
I lUlU / Actuator is not activated and actuator relay is activated (with vehicle Front left Outlet stopped and engine running): Battery voltage (Approx. 12V)
solenoid
'1:e
to
tooen
a connector terminal when
using a circuit tester for inspection. Control
I
unit
power
supply circuit
ST
Stop lamp switch
and circuit
ABS motor, motor
R8
relay and circuit
ABS actuator relay
and circuit
pL
ABS warning lamp
and circuit, ABS
actuator relay
SD monitor circuit
ABS solenoid and
circuit
ABS motor monitor
circuit
ABS warning lamp
and circuit
Wheel sensors and circuit
ABS solenoid and
circuit
'2: ABS warning lamp ON: When the ignition switch is turned ON (before starting the engine) or a malfunction is detected ABS warning lamp OFF: One second after the ignition switch is turned ON (with the system in normal condition) *3: Tire pressure must be in accordance with specification.

ANTI-LOCK BRAKE SYSTEM
Control Unit InputfOutput Signal Specifications
(Cont'd)
USING CONSULT
Indicated are the control unit computed data. If the output circuit (harness) should be open or short-
circuited, correct values may be displayed.
Check item (Reference)
Data monitor
Display Condition
Monitor
item
Specifications
Vehicle is stationary.
I 0 kdh
FR RH SENSOR
FR LH SENSOR
RR SENSOR
[kdh]
Virtually the same speed
as speedometer (within
+I 0%)
Wheel sensor and circuit
Wheel speed
Vehicle is
drivem'l
Brake pedal is
depressed. Stop lamp switch and
circuit
STOP
LAMP SW
[ON-OFF] Brake pedal status
Brake pedal is not
depressed. OFF
-- --
Actuator (solenoid)
is
activated (at CONSULT
active test),
or
actuator relay is not
activated (with fail-safe
function activated and
engine not running).
FR
RH IN SOL
FR
LH IN SOL
REAR IN SOL
[ON-OFF]
ABS solenoid and circuit
Solenoid status
FR RH OUT SOL
FR
LH OUT SOL
REAR OUT SOL
[ON-OFF]
-- -- - -- -
Actuator (solenoid) is not
activated and actuator
relay is activated (with
vehicle stopped and
engine running).
Actuator relay is acti-
vated (with engine run-
ning).
Actuator relay is not acti-
vated (with fail-safe
function activated and
engine not running).
ABS actuator relay and
circuit
OFF
ON
OFF
ACTUATOR
RLY
[ON-OFF] Actuator
relay status
Motor relay and motor
are activated (at CON-
SULT active test). ABS
motor, motor relay,
and circuit
MOTOR
RLY
[ON-OFF] Motor
relay and motor
status Motor relay and motor
are not activated. OFF
ABS warning lamp and
circuit
- -
Waming lamp ON'2 1 ON
WARNING LAMP
[ON-OFF] ABS
warning lamp sta-
tus
Power supply voltage
provided for control unit -- -
Warning lamp OFF'2 1 OFF
Control unit power sup-
ply circuit - -
BAlTERY VOLT [V] Ignition switch
ON
'1: Tire pressure must be in accordance with specification. "2: ABS warning lamp ON: When the ignition switch is turned ON (before starting the engine) or a malfunction is detected ABS warning lamp OFF: One second after the ignition switch is turned ON (with the system in normal condition)

TCS/ABS SYSTEM
Control Unit InputlOutput Signal Specifications
(Cont'd)
Terminal No.
Specifications'l
- - --
Check item (Refer-
ence)
- - -
Body
ground
-
Approx. 7V - - or higher Communication
line circuit between
TCSIABS control
unit and throttle
control unit
DKV
(throttle angle
output)
Acceleration pedal is released: approx. 1 ms (reference)
ABS warning lamp ABS warning
lamp
and circuit 4B3 warning lamp 0Nr2: Approx. OV
4BS
warning lamp 0FF72: Battery voltage (Approx. 12V)
cictuator
relay is activated (with engine running): Battery voltage
(Approx.
12V)
ktuator
relay is not activated (with fail-safe function activated and engine
70t
running): Approx.
OV
ABS warning lamp
and circuit,
ABS
actuator relay and
circuit
Actuator relay
monitor
48s
motor is running (in
CONSULT active test mode): Less than approx.
2V
4BS motor is stopped: Battery voltage (Approx. 12V)
TCS is not activated: ABS
motor, motor
relay and circuit
ABS
motor relay
Approx. 7V - -
OV I I Communication
line circuit between TCSfABS control
unit and throttle
control unit
DKR
(throttle
motor target angle
signal) Approx. 9 ms (Reference)
Front
right inlet
solenoid
Front right outlet
solenoid
4ctuator
is activated (in CONSULT active test mode), or actuator relay is
lot
activated (with fail-safe function activated and engine not running):
4pprox.
OV
4ctuator
is not activated and actuator relay is activated (with vehicle
stopped and engine running): Battery voltage (Approx.
12V)
Rear inlet solenoid
Rear outlet
sole- ABS solenoid and
circuit
Front left inlet
solenoid
Front left outlet
solenoid
Battery gnition switch
ON: Baitery voltage
(Approx. 12V) Control
unit power
supply circuit
'1: Do not force to oDen a connector terminal when usina a circuit tester for ins~ection. '2: ABS warning lamp ON: When the ignition switch is t6ned ON (before startirig the engine) or a malfunction is detected
ABS warning lamp OFF: When the engine has started (with the system in normal condition)
'3: Tire pressure must be in accordance with specification. '4: TCS OFF indicator lamp ON: When the ignition switch is turned ON (before starting the engine), a malfunction is detected,
or TCS OFF switch is turned ON TCS OFF indicator lamp OFF: When the engine has started (with the system in normal condition) and the TCS OFF switch
is off '5: SLlP indicator lamp ON: When the ignition switch is turned ON (before starting the engine) or a malfunction is detected
SLlP
indicator lamp OFF: When the engine has started (with the system in normal condition) and the TCS is inoperative

TCS/ABS SYSTEM
Control Unit Input/Output Signal Specifications
(Cont'd)
THRTL OPENING TAR-
GET
[%]
Display Monitor item
Motor throttle angle con-
dition
TCS
MODET3
TCS OFF LAMP Data monitor I Condition
Specifications
TCS is inoperative.
TCS is operational.
Communication line
cir-
TCS is inoperative.
Number of cylinders to cuit between
TCS/ABS
which fuel is cut off control unit and
I.z /LT TCS is operational.
ECM-TCM or ECM
GEAR
TCS
SW
TCS OFF indicator lamp
TCS OFF indicator lamp
status
1 1 lEi3FF indicator amp
TCS OFF indicator lamp
@
Check item (Reference)
SLlP LAMP
0%
0 - 100%
Gear selection
TCS OFF switch status (ONIOFF)
P/N POSITION SIGNAL Communication line cir-
@
cuit
between TCSIABS
control unit and throttle
control unit
lzc
SLlP indicator lamp is / ow
TCS OFF switch circuit ST
I
1: 1st gear 2: 2nd gear 3: 3rd gear
4: 4th gear 5: 5th gear
SLIP
indicator lamp
sta-
cuit
TCS switch ON
TCS switch OFF
PNP switch signal or
neutral position switch
signal status (ONIOFF) ON
OFF
SLlP indicator lamp is
ON.
( A/T selector position: I I
I %~hift position: I ON
ON
SLIP indicator lamp cir-
1 Other than Neutral I 1
Neutral
A/T selector position:
Other than N and P
MA' shift position:
A/T PNP switch or neu-
tral position switch circuit
OFF
'1: Tire pressure must be in accordance with specification.
'2: ABS warning lamp ON: When the ignition switch is turned ON (before starting the engine) or a malfunction is detected ABS warning lamp OFF: When the engine has started (with the system in normal condition) '3: TCS mode: 0 - 24, number of cylinders to which fuel is cut off x 4
Throttle control unit
THRTL POS SEN
Display
TH MOTOR VOLT Monitor item I Sensor
voltage (V)
Sensor voltage
(V)
Throttle valve is fully
I Approx. 0.5V closed.
Engine is idling.
I
Data monitor
Approx. 3.4V
Condition
TH OPEN CONT Specifications
Motor throttle target
angle signal (ms)
NEUT
POSl
SW
START
SIGNAL
ONIOFF TCS
is inoperative
Shift (selector) lever is in
parkheutral
position. Approx.
9 ms Check
item (Reference)
ON
1
Throttle position sensor
circuit
ONIOFF Throttle motor sensor
circuit
Communication line cir-
cuit between
TCS/ABS
control unit and throttle
control unit
Start signal circuit
ParWneutral position
switch circuit
Ignition switch
ON
I

ELECTRIC SUPER HICAS
INSPECTION BEFORE DRIVING
Check fluid leakage from power steering components (gear, pump, piping, etc.), and check whether the
fluid level is within the proper range.
Check whether tire size and inflation pressure are within the specified limits. Check also whether the
steering wheel is a genuine part, and whether a non-genuine control unit is attached.
Check whether wheel alignment is within the specified limits.
Check whether suspension system is modified, and whether the modification, if any, has increased the
vehicle weight.
INSPECTION DURING DRIVING
Check facts about trouble (what, when, where, who, why and how).
Check whether the engine is running in good condition.
System Description
This system contains two functions for SUPER HICAS: self-diagnosis function and fail-safe function.
For self-diagnosis function, refer to "SELF-DIAGNOSIS PROCEDURE on pages ST-7 and
ST-12.
FAIL-SAFE FUNCTION
If the system detects some error, it halts the normal control and enters the fail-safe mode.
In this event, the system notifies the driver of a malfunction by turning ON the HICAS warning lamp.
The fail-safe mode is canceled when ignition switch
is turned OFF. If, however, the fail-safe mode is caused
by a vehicle speed signal error, it is automatically canceled when the signal is restored before the ignition
switch is turned OFF.
HICAS WARNING LAMP
When the system is in normal condition, HICAS warning lamp is turned ON by switching the ignition ON, and
is turned OFF after engine has started.

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