belt NISSAN GT-R 1998 Service Manual

TROUBLE DIAGNOSES
Symptom Matrix Chart (Cont'd)
RELATION BETWEEN TROUBLE SYMPTOMS AND ENGINE MECHANICAUACCESSORIES
Malfunction of the gasoline engine will not occur when the three elements of combustion (compression
pressure, aidfuel mixture, and spark) are all normal. Though the
aidfuel mixture and the spark (ignition tim-
ing) are controlled by ECM
(.TCM) control unit, if the engine mechanical is malfunctioning,
a malfunction will
occur. (The table below shows universal cases. Some cases may not apply to the vehicle.)
Engine mechanical-related malfunction
0: High possibility 0: Medium possibility A: Low posstbility
I No I Hard
start start
I Air sucked in at oil level gauge
Air sucked in at oil filler cap
Loose air duct
(A-F/M downstream) 0 A
Misconnection of canister piping
0 A
Cracked intake manifold
0 A
Aidfuel
mix-
ture
PCV valve stuck open
Clogged fuel strainer
0 A
Clogged air cleaner element
Malfunctioning pressure regulator
A 0 0 0
Improper gasoline properties A000
EGR valve stuck open 0 0
Deposits on valve 0 0
Excessive canister purge volume
Misconnection of high-tension wire
Improperly adjusted ignition timing
Malfunctioning spark plug
High-tension wire leaks
A000
Spark Distributor cap leaks
A000
Compres-
Improper valve contact
sion pres-
. a080
sure Worn piston ring ~080
Others
Clogged catalytic converter or
exhaust system A00
Low base idle speed A
A
Foreign material (vinyl, etc.) in fuel 1 tank
Clogged radiator or capacitor
IIII
Rough idle I Poor drivability Engine stall
- - - - - - -- ': Fast
idle
Adding to the items listed above, check the following.
Wiring harness for tension Ground wires for loosenes nuids and oils for levels All connectors for connection Battery connections for loosenes and corrosion Drive belts for loosenes

TROUBLE DIAGNOSES
Symptom Matrix Chart (Cont'd)
Engine mechanical-related malfunction I Symptom characteristics and inspection hints
Airffuel
ratio becomes lean.
Air sucked in at oil filler cap
Aidfuel ratio compensation factor becomes higher.
a Intake manifold induction vacuum becomes lower.
I Cracked intake manifold I
Misconnection of canister piping Use an induction vacuum (pressure) gauge for check.
' Common to all air sucking conditions from air intake system.
-
PCV valve stuck open
I Malfunctioning pressure regulator I Various symptoms occur depending on the fuel pressure.
Abnormal noise (peep) may
be heard.
Air/fuel
mixture
Improper gasoline properties Various
symptoms occur depending on the properties.
IEGRiale
stuck open
I
Clogged fuel strainer .
Clogged air cleaner element
Deposits on valve
r
Symptoms vary with the condition how they are clogged. However, the
symptoms tend to occur when the vehicle is driving at high speed and
under high load.
I
Air/fuel ratio becomes lean. Airfluel ratio compensation factor becomes
higher.
Excessive canister purge volume
I
Engine may stall when the accelerator pedal is lightly pressed. (Especially
in summertime.)
Misconnection of high-tension wire Check if the ignition timing
is correct. 1 Improperly adjusted ignition timing 1
Malfunctioning spark plug 1
Corn- I Improper valve contact I Symptoms vary with the degree of contact and the number of cylinders. '
High-tension wire leaks
Distributor
cap leaks Symptoms
vary with the degree of leaks.
Clogged catalytic converter or exhaust sys-
l tem , In many cases, engine stalls and then restarts after a while. I
pression I
Low base idle speed
pressure
Worn piston ring I
Engine may
stall while the vehicle is decelerating or when the power '
steering load or electrical load is applied.
Symptoms vary
with the degree of wear and the number of cylinders.
I
Air conditioner load too heavy I Too much refrigerant in the system. j
Others Dragging
brake
Belt tension too high
1
I Clogged radiator or capacitor I
ArJ load too heavy
Foreign material (vinyl, etc.) in fuel tank Insufficient A/T fluid (FR model)
Symptom tends to occur when fuel level in the tank becomes lower.

TROUBLE DIAGNOSES - supplemental Restraint System (SRS)
Component Parts Location
Passenger air bag module
Diagnos~s
sensor
unit Driver air bag module
S~de
air
bag nodule
Satell~te sensor Seat belt pre-tensloner SRB0568D
Precautions
To perform system diagnosis, use self-diagnosis function and
CONSULT.
Do not use electrical test equipment such as a circuit tester
because
any wrong operation caused by a weak electric cur-
rent
of a tester must be prevented.
Circuit Diagram

TROUBLE DIAGNOSES - Su~plemental Restraint Svstem (SRS)
-
connector for
SELF-DlAG [CURRENT] C
* NO SELF DIAGNOSTIC
FAILURE INDICATED.
FURTHER TESTING
MAY BE REQUIRED. $ *
-1 PRINT
Preliminary Check
Check battery voltage and specific gravity.
When battery voltage drops to less than approx. 9V, the
"AIR BAG" warning lamp starts flashing (indicating a mal-
function).
Gj
Check the connections of component connectors.
Check that the fuse is not blown.
3F
Trouble Diagnoses with CONSULT
SELF-DIAGNOSIS PROCEDURE
Connect CONSULT to data link connector on the vehicle.
Turn ignition switch "ON".
83
Touch "AIR BAG" on the CONSULT screen.
Touch an appropriate mode key on "SELECT DlAG MODE"
screen.
gL
The self-diagnostic result for the selected mode is displayed.
Repair or replace the malfunctioning part according to the
self-
diagnostic result.
89
Touch "PRINT, if printout is required.
After
repairing the malfunction, touch "SELF-DIAG
[CURRENT]", and after checking that "NO SELF DIAGNOSTIC
FAILURE INDICATED" is shown on the display, touch
"ERASE.
For seat belt pre-tensioner system, the diagnostic proce-
dure
is completed when "NO SELF DIAGNOSTIC FAILURE
INDICATED"
is displayed.
FURTHER TESTING MAY BE REQUIRED. * *
* NO SELF DIAGNOSTIC
FAILURE INDICATED.
t
PRINT SRS609
9. Return to "SELECT DlAG MODE" screen and touch "SELF-
DlAG
[PAST]".
10. After checking that "NO SELF DIAGNOSTIC FAILURE INDI-
CATED" is displayed on the "SELF-DIAG [PAST]" screen, fin-
ish the diagnosis.

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Trouble Diagnoses with CONSULT (Cont'd)
SELF-DIAGNOSTIC CODE CHART - -
Diagnostic item 1 Explanation Repair order
NO SELF-DIAGNOSTIC
I NO malfunction is detected. I - FAILURE INDICATED
AIRBAG MODULE
iOPENl
Driver air bag module circuit is open (including the
spiral cable).
Driver air bag module circuit is shorted to some power
supply circuit (including the spiral cable).
Driver air bag module circuit is shorted to ground
(including the spiral cable).
Driver air bag module circuits are shorted to each
other (includina the s~iral cable).
AIRBAG
MODULE
IVB-SHORTI
1. Visually
check the wiring harness c~nnection. 2. Check conbnuity of the spiral cable. 3. Replace driver air bag module. 4. Replace the diagnosis sensor unit. 5. Replace the harness if it has visible damage.
AIRBAG
MODULE
IGND-SHORTI
AIRBAG
MODULE
[SHORT]
--
CONTROL UNIT I Diagnosis sensor unit is malfunctioning. I 1. Visually check the diagnosis sensor unit connection. 2. Replace t9e diagnosis sensor unit.
ASSIST
NB MODULE
[OPEN] I Passenger air bag circuit is open. I
ASSIST NB MODULE
NB-SHORTI
ASSIST
NB MODULE
[GND-SHORV
Passenger air bag circuit is shorted to Some Power
supply circuit. ,
Passenger air bag circuit is shorted to ground.
ASSIST
NB MODULE
lSHORTl
1. Visually check the wiring hamess connection. 2. Replace passenger air bag module. 3. Replace the diagnosis sensor unit. 4. Replace t!!e harness if it has visible damage.
Passenger air bag circuits are shorted to each other.
Driver side air bag circuit is open.
SlDE
MODULE RH
{OPEN]
SlDE MODULE RH
[VB-SHORT]
SlDE MODULE RH
[GND-SHORTI
Driver side air bag circuit is shorted to Some power
supply circuit.
Driver side air bag circuit is shorted to ground.
SlDE MODULE LH
[OPEN]
I Passenger side air bag circuit is open. I
1. Visually check the wiring hamess connection. 2. Replace driver side air bag module. 3. Replace the diagnosis sensor unit. 4. Replace the harness if it has visible damage.
SlDE MODULE
RH [SHORT]
SIDE MODULE LH
NB-SHORTI Driver side air bag circuits are shorted to each other.
SlDE MODULE LH
[GND-SHORT]
Pa~Sengef side air bag circuit is shorted to Some
power supply circuit. -
Passenger side air bag circuit is shorted to ground.
1. Visually check the wiring harness connection. 2. Replace passenger side air bag module. 3. Replace the diagnosis sensor unit. 4. Replace the harness if it has visible damage.
SlDE MODULE LH
ISHORTl
Passenger side air bag circuits are shorted to each
other.
Driver satellite sensor is malfunctioning.
SATELLITE SENS
RH
[UNIT FAIL] 1. Visually check driver satellite sensor connection. 2. Replace the driver satellite sensor. 3. ReDlace the harness if it has visible damage.
SATELLITE SENS RH
[COMM FAIL]
Driver satellite sensor is malfunctioning. Diagnosis sensor unit is malfunctioning. Wiring harness between diagnosis sensor unit and
satellite sensor is damaged.
SATELLITE SENS LH
[UNIT FAIL]
1. Visually check driver satellite sensor connection. 2. Replace the driver satellite sensor. 3. Replace the diagnosis sensor unit. 4. Replace the harness if it has visible damage.
1. Visuallv check the connection of passenqer satellite 0i 0 Passenger satellite sensor is malfunctioning. sensor: 2. Replace
C!e passenger satellite sensor. 3. Re~lace the harness if it has visible damage.
SATELLITE SENS
LH [COMM FAIL]
Passenger satellite sensor is malfunctioning. Diagnosis sensor unit is malfunctioning. Wiring harness between diagnosis sensor unit and
satellite sensor is damaged.
1. Visually check the connection of passenger satellite
sensor.
:: ~~~/~~~ ;E $~~,","$,"~~~~~t",$fnsOr' 4. Replace the harness if it has visible damage.
1. Visually check the wiring harness connection. 2. Replace driver seat belt pre-tensioner. 3. Replace the diagnosis sensor unit. 4. Replace the harness if it has visible damage.
J. I
1. Visually check the wiring harness connection. 2. Replace passenger seat belt pre-tensioner. 3. Replace the diagnosis sensor unit. 4. Replace the harness if it has visible damage.
DRIVE
PRE-TENSIONER
[OPENNB-SHORT]
DRIVE PRE-TENSIONER
[GND-SHORTJ
ASSIST PRE-TENSIONER
[OPENNB-SHORT]
ASSIST PRE-TENSIONER
[GND-SHORT] I I
a The screens for "SELF-DIAG [CURRENTJ", "SELF-DIAG [PAST]" and "TROUBLE DlAG RECORD" share the same message. Follow the repair procedures in numerical order. Check whether a malfunction is eliminated each time a repair item is
finished, and when the malfunction is eliminated, further repair work is not required.
After repairing the system, touch "ERASE" to clear the memory and check with CONSULT again.
If both seat belt pre-tensioner systems on the driver seat and passenger seat have failed at the same time, only one of
the two failures is displayed first. The other failure is displayed after the first failure is repaired. For seat belt pre-tensioner
systems,
only
"SELF-DIAG [CURRENTJ" is displayed; "SELF-DIAG
[PASTJ"
and "TROUBLE DlAG RECORD" are not dis-
played.
RS-4
The circuit for the driver seat belt pre-tensioner is
open or shorted to some power supply circuit.
The circuit for the driver seat belt pre-tensioner is
shorted to ground.
The circuit for the passenger seat belt pre-tensioner is
open or shorted to some power supply circuit.
The circuit for the passenger seat belt pre-tensioner is
shorted to ground.

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Trouble Diagnoses without CONSULT (Cont'd)
How to erase self-diagnostic results (Reset)
After repairing the system and while staying in Diagnosis mode,
check that the system has returned to normal; then, turn
tion switch
"OFF' and then back "ON". The mode returns
mode and the diagnosis record is erased.
SEAT BELT PRE-TENSIONER SYSTEM
Self-diagnosis
Only User mode is available.
.User mode
Driver seat belt
(Seat belt buckle
switch) Warning
lamp flash pattern
Malfunctioning part
Fastened (OFF)
IGN SW: ON
Unfastened (ON)
Fastened (OFF)
I IGN SW: ON System restored
+o.s Sec.
Unfastened (ON)
( IGN SW: ON Fastened I
-'n~0.5 sec.
I I -+OS sec. I
&
Driver and passenger
seat belt pre-tensioner
circuits
Diagnosis sensor unit
the igni-
to User
Diagnostic item
No malfunction is
detected.
No malfunction is
detected.
Shorted to power sup-
ply circuit
Open circuit
Shorted to ground
Diagnosis sensor unit
malfunction
The display indicating a malfunction (flashes) changes to the display indicating no malfunction when the malfunction is
repaired.
After pre-tensioner is activated, the warning lamp stays "ON".

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Symptom Chart
Trouble phenomenon I Malfunctioning unit I Possible cause
I I Warning lamp and internal circuit of combination meter are
BAG warning lamp does
not turn on. (All other warn-
ing lamps turn on.)
L-L .. AIR BAG warning lamp does I
I Harness between diagnosis sensor unit and combination
AIR
BAG warning lamp circuit
Air bag power supply circuit
not turn off (always ON). (AIR BAG warning lamp circuit
I meter is faulty (open).
faulty.
P-$ ;
Harness between
diagnosis sensor unit and combination 'bJ
Diagnosis sensor unit
0 Air bag power fuse has blown.
0 Air bag power harness is faulty.
meter is faulty
(shorted).
Diagnosis sensor unit is faulty.
I23
Diagnosis sensor unit
0 Internal circuit of combination meter is faulty. BR
Diagnosis sensor unit is faulty.
AIR BAG warning lamp
flashes.
When driver seat belt is
fas-
lamp does not illuminate for
seconds. (All other warning
Low battery voltage (Less than 9V)
Conduct either diagnosis with CONSULT (self-diagnosis, trouble diagnosis record) or diagnosis ST
without CONSULT (self-diagnosis), and repair the malfunctioning part.
After repairing the malfunctioning part, erase the memory for malfunction record.
Warning lamp and internal circuit of combination meter are 1
tened(buckleswitchisoff)
and ignition switch is turned
on, the SEAT BELT warning
1 Air bag power
SEATBELTwarninglampcircuit
circuit faulty.
Harness between
diagnosis sensor unit and combination HA
meter is faulty (open).
Air bag power fuse has blown.
0 Air bag power harness is faulty.
lamps illuminate.)
When driver seat belt is fas-
tened (buckle switch is off)
When driver seat belt is fas-.
I I
Diagnosis sensor unit
and ignition switch is turned
on, the SEAT BELT warning
lamp does not turn off
7 sec-
onds later.
tened (buckle switch is off)
I I
-.
0 Diagnosis sensor unit is faulty.
SEAT
BELT warning lamp circuit
,
and ignition switch is turned
on, the SEAT BELT warning
fa> Harness between diagnosis sensor unit and combination su
meter is faulty (shorted).
Driver seat belt buckle switch circuit
Diagnosis sensor unit
Seat belt pre-tensioner circuit
Harness between combination meter and driver seat belt
buckle switch is faulty (shorted).
Driver seat belt buckle switch is faulty (sticking).
Diaqnosis sensor unit is faultv.
Conduct either diagnosis with CONSULT or diagnosis with-
out CONSULT, and repair the malfunctioning part.
lamp turns on, and
7 sec- I I
onds later, flashes.
When driver seat belt is not
fastened (buckle switch is on)
I I Driver seat belt buckle switch ground harness is faulty
lamp turns off about
7 sec-
onds later.
and ignition switch
is tumed
on, the SEAT BELT warning
tence).
Driver seat
belt buckle switch circuit I !::);eat belt buckle switch is faulty (contact intermit-
If the flashing of AIR BAG warning lamp is caused by low battery voltage, self-diagnosis mode cannot be switched from User
mode to Diagnosis mode. In this case, diagnosis with CONSULT displays "NO SELF-DIAGNOSTIC FAILURE INDICATED".

ENGINE MECHANICAL I RB~ODE (UB) ]
STANDARD AND REPAIR LIMIT
Firing order I 1-5-3-6-2-4
Compression pressure
MPa
(kg/cm2)/rpm
Distortion limit mm
- - -- --- - Ignition advance device
Electronically-controlled ignition advance
Engine
oil capacity
e
Spark plug standard
Limit
. Limit
of variation between cylinders
Intake manifold
Intake manifold collector
Exhaust manifold
Cylinder head
Cvlinder block
lgnition timing (during no feed back control) 1.23
(1 2%)/300
0.93 (9.5)1300
0.1 (1.0)/300
0.1 0.1
0.3
0.2
0.1
Without filter
With filter
MakerlTypeISpark
plug gap mm
Engine idling speed
W'
Idle base speed (during no feed back control)
rPm
Density of
COIHC at idling speed
Wppm Approx.
3.8
Approx. 4.2
NG WPFR5G-11 11.0
- 1
-1
650-.50
(N or P position for
A/T)
600 (N or P position for AlT)
Less than O.l/Less than 50
I New I Used I Limit
Valve
clearance
(INTIEXH)
mm
Deflection
amount of accessory V-belt
Measured with tension gauge
N (kg) Hot
engine
.
Cold engine (at ambient temperature)
Measured by pushing at 98 N (10 kg)
mm 0.36+0.062/0.53+0.062
0.31 1~,0.04/0.50i0.04
Fuel tank capacity
e
Engine coolant total capacity [with reservoir tank (max. level)] e
Thermostat opening temperature [start to open - full open]
"C
Radiator cap opening pressure
MPa (kg/cm2) Approx.
65
Approx. 9.4 82 - 95
0.06
- 0.1 0 (0.6 - 1 .O)
A/C compressor belt
Power
steering pump belt
Fan belt
Power steering pump belt
1 8-10 1 10-12 1 16
667
- 755
(68
- 77)
A/C compressor belt 1 6-8 1 7-9 / 12
Fan belt
1 3-5 1 4-6 1 7.5
559 - 637
(57
- 65)
SEC.117 Power steering
Fan belt pump be1 t
284 (29)

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
STANDARD AND REPAIR LIMIT
Firing order
Compression pressure
MPa (kg/cm2)/rpm
-
Intake manifold
Intake manifold collector
--- - Standard Limit
Limit of variation between
cylinders
0.1
0.1
Distortion limit mm
Engine oil capacity
P
Spark plug
Deflection amount of accessory
V-belt Power steering pump
belt
I
- -- - - 1.26 (1 2.8)/300
0.96 (9.8)/300
0.1
(1 .OY300
Measured with tension gauge Exhaust
manifold
Cylinder head
Cylinder block
Without filter
With filter
MakerKype/Spark
plug gap
mrn
I "
650.-50 (N or P position for CVT)
600 (N or P position for AIT)
Less than O.l/Less than 50
15U600
0.36~0.06210.53~0.062
0.31 -.0.04/0.50~0.04
Approx. 65
Approx. 9.4
82 - 95
0.06 - 0.10 (0.6 - 1 .O)
"
Engine idling speed rpm
Idle base speed (during no feed back control)
rpm
Density of
COIHC at idling speed
%/ppm
Ignition timing (during no feed back control)
BTDCO/rpm
I NC compressor err
0.3
0.2
0.1
Approx. 3.8
Approx. 4.2
NGWPFR5G-11/1.0
- 1.1
lanition
advance device
1
Valve clearance (INTIEXH) mm
(kg)
/ Fan belt Electronicallv-controlled
ianition
advance
Hot engine
Cold engine (at ambient temperature)
I power steerina DU~D belt 1 8-10
Fuel tank capacity
Q
Engine
coolant total capacity [with reservoir tank (max. level)] e
Thermostat opening temperature [start to open - full open] OC
Radiator cap opening pressure
MPa (kg/crn2)
,
I Fan belt 1 3-5
Measured
by pushing at 98
N (10 kg)
mm
I SEC.! I7 Power steering I
*I I 1
AK compressor belt 1 6-8
Fan belt pump beit
Used 1 Limit