1998 NISSAN GT-R engine oil

ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System
Diagram (Cont'd)
a
E a - al 1 U.
Malfunction indicator lamp
Fuel pump control signal
+
ParWneutral position switch signal 2 - 1 F
Vehicle speed signal D 4 -
Crankshaft position sensor signal - - - m 2 c 0, Air conditioner switch signal * Y .- "Y
~ngine coolant temperature sensor signal - B * 4 C C Ignition timing control signal 0, P - ID - - Auxiliary air control signal a C - 2s
Refrigerant pressure sensor signal +
Power steering oil pressure switch signal
Variable valve timing control sign
- Variable air intake control
I I
solenoid valve control sig

ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Diagram (Cont'd)
Resistor a
I I~I I 1
w
C LLOE Malfunction indicator lamo
I Fuel DU~D control sional I Vehicle soeed sianal I
Parklneutral position switch signan I Refrigerant pressure sensor sianal
Air conditioner switch signal- rr -
- Power steering oil pressure switch signal
Crankshaft position sensor signal s - 0 Heated oxygen sensor output signal
Engine coolant temperature sensor signalC k - Mass air flow sensor signal r
- Ignition timing control signal ,- U I W Knock sensor output signal
Airlfuel
ratio control
signal-
Variable valve
timing
control
s~anal
Turbo pressure signal
Auxiliarv
air amount control
I
signal 2 L
g E8z E $, r
Air regulator
LT Turbo pressure sensor

ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Component Parts Location
RB20DE (UB), RB25DE
Component name I Type I Location
I Fuel iniector I Hiah-resistance I Fuel tube
I Fuel pump I Electric, turbine I Right rear of luggage compartment (in
fuel tank)
AAC valve
IAA
unit Air reaulator
5 m 3 '
Solenoid valve (Duty control)
Wax
variable intake control solenoid valve
Variable air intake control actuator
Air jet swirl solenoid valve
[RBPODE (UB)]
Air jet swirl actuator
[RB20DE (LIB)]
Crankshaft position sensor Ring gear crankshaft position sensor
[RB20DE (UB)]
Mass air flow sensor Intake
manifold collector (Upper)
Ignition coil
Canister purge control valve
Variable valve tirnina control
solenoid valve
(? o C
Solenoid valve (ON-OFF control)
Diaphragm
Solenoid valve (ON-OFF control)
Diaphragm Photoelectric (Directly driven by cam-
shaft)
Magnetic
Hot wire
w v,
Micro-mold (Built into power transistor)
Solenoid valve (Duty control)
Solenoid valve (ON-OFF control) Upper part of rocker cover
Intake manifold collector
Lower part of intake manifold
Left front
of cylinder head
Clutch housing or converter housing
Air cleaner
Throttle position sensor [Incorporates throttle valve
switch
(All models only)]
Power steering oil pressure switch
Vehicle speed sensor
ECM
(.TCM)
ECM
& IGN coil relay Cylinder head
(Top of each spark plug)
Upper part of rocker cover
Front end of cylinder head
Engine coolant temperature sensor
Heated oxygen sensor
Knock sensor Variable
resistance
ON-OFF switch
Electromagnetic power generation
104-pin digital control
Small universal relay (2M) Throttle chamber
Thermistor
Zirconia (with heater)
Piezoelectric Rear of radiator lower hose
Transmission Passenger dashboard side
Passenger dashboard side
Behind ECM
(.TCM) Water
outlet
Exhaust manifold
Cylinder block

ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Component
Parts Location (Cont'd)
" . . ., . .7
Comoonent name I TVLE a r Fuel injector High-resistance
Fuel pump
Electriclturbine
5 I unit I AAC valve I Solenoid valve (Duty control)
S Air reoulator 1 wax -1 I " - . -.
4 Ignition coil I Micro-mold (Built into power transistor)
I Canister purge control valve I Solenoid valve (Dutv control) ---- - Variable valve timing control solenold valve I Solenold valve (ONtOFF control)
Turbo pressure control solenoid valve
I Solenoid valve (OMOFF control)
Crankshaft position sensor Photoelectric
(Directly driven by cam-
shaft)
Mass air flow sensor
Hot wire
Throttle position sensor [Incorporates throttle valve
switch
(AlT model only)] Variable
resistance
Throttle motor sensor
09 Variable resistance
5 Engine coolant temperature sensor Thermistor V) Heated oxygen sensor
Zirconia (with heater)
Knock sensor Piezoelectric
Turbo pressure sensor Silicone diaphragm
Power
steering oil pressure switch
ONJOFF switch
( Vehicle speed sensor
Electromagnetic power generation
ECM
(.TCM) 104-pin digital control
Fuel pump control modulator (FPCM)
Voltage control
1 ECM L IGN co~l relay Small un~versal relay (2M) P t
.
Fuel tube
Right rear of luggage compartment (in
fuel tank)
Intake manifold collector
Cvlinder head
UOD of each soark olua)
Upper part of rocker cover
Front end of cylinder head
Next to left strut tower
Left front end of cylinder head
Air cleaner
Throttle chamber
Water outlet
Turbocharaer exhaust outlet
Cylinder
block
Upper part of rocker cover
Rear of radiator lower hose
Transmission
Passenger dashboard side
Left rear of
luaaaae comoartment
-- Passenger dashboard s~de
ECM ( TCM)

ENGINE AND EMISSION CONTROL OVERALL SYSTEM
ECM (-TCM) Terminal Layout
I GY
CH~'GN- (Data link connector for CONSULT)
Terminal NO.
1 Description Terminal 1 No I Description - - 1 I lgnition
signal (Power transistor drrve signal) Cyl. No. 1 1 '34 Iu1" positron switch signal -- ---- 2 1 Ignition signal (Power transistor drive signal) Cyl. No. 5 1 '35 1 ''2" posifion switch signal - - 3 1 Ignition signal (Power transistor drive signal) Cyl. No. 3 1 36 1 -
4 I ECM 6 IGN coil relay control signal 1 37 1 Throttle opening signal
[RB25DE.4WD,M/TS RB25DE.m RB25DEll
- - - -- - - - - 8 ( Ignition signal (Power transistor drive signal) Cyl. No. 2 ( '41 1 f-k swltch signal
5
6
7
11 ( AAC valve control signal ( 44 1 Crankshaft position sensor 120' (REF) signal
Tachometer
drive signal
-
Ignition signal (Power transistor drive signal) Cyl. No. 6
9
10
'38
39
'40
Ignition signal (Power transistor drive signal)
Cyl.
No. 4
-
12
13
"D" position switch signal
Neutral signal
(Parklneutral position switch)
"R" position switch signal
14
Symbols in ( ) next to terminal numbers indicate the data link connector terminals. Items marked with are available on RB20DE (UB) and RB25DET.m models only.
42
43
-
Fuel pump relay control signal
15
16
17
18
19
20 21
22 (CHK)
23
24 (IGN)
25
26
27
28
29
30
31
32
'33
- -
Sensor around
Air conditioner relay control signal 45
46
-
-
Malfunction indicator lamp
-
-
Ignition switch (START) signal
Air conditioner switch signal
Check (Diagnosis start)
Throttle position sensor signal
Ignition switch
(IGN) signal
Control unit ground
Power steering oil pressure switch signal
-
1 SB (select bit) 1 signal [RB25DET.A/Tl
1 Vehicle speed sensor signal (Vehicle speed sensor 2)
Headlamp switch signal
Ignition power supply
Control unit ground
Idle position switch signal Crankshaft
position sensor 120" (REF) signal
Crankshaft position sensor 1
" (POS) signal
47 Ring gear crankshaft position sensor signal [RB20DE (UB)]
Turbo pressure sensor signal
LRB25DEl-J
48
49
50
51
52
53
54
55
56
57
'58 59
'60 61
62
63
64
65
66 Power
supply for throttle position sensor, refrigerant pressure
sensor, and turbo pressure sensor
Rear defogger switch signal
Heated oxygen sensor signal
Throttle motor sensor signal [RB25DET]
SB
(select bit)
2 signal (RB25DET.ATJ
Motor throttle switch signal
[RB25DET]
Mass air flow sensor signal
Mass air flow sensor ground
Engine coolant temperature sensor signal
Refrigerant pressure sensor signal
Output shaft rotation sensor signal (Vehicle speed sensor 1)
Turbine sensor signal
[RB25DET.AlTj
Oil temperature sensor signal
Knock sensor signal
1
Knock sensor signal 2
PJT mode switch signal (POWER) [RB20DE (UB).A/Tl
DB (data bush) 1 signal [RB25DET.W
DB (data bush)
3 signal [RB25DET.W

TROUBLE DIAGNOSES
CONSULT (Cont'd)
ACTIVE TEST MODE
INJECTION I . CCohArthe amount of fuel injection
TEST ITEM
CONDITION
Engine: Return
to the original trouble
- I . Engine: After warming up, idle the
IACV-AACN
OPENING
ENG COOLANT
TEMP
IGNITION TIMING
US~~~CONSULT.
Engine: After warming up, idle the
engine.
Change the IACV-AAC valve opening
percent using CONSULT.
Engine: Return to the original trouble
conditioo
Change the engine coolant
temperature using CONSULT.
Engine: Return to the original trouble
condition
Timing light: Set Retard the ignition timing using CONSULT.
POWER BALANCE engine. A/C switch "OFF . Shift lever uNn
COOLING
FAN RB25DE, RB25DET
FUEL PUMP RELAY
VlAS SOL VALVE RB20DE (UB), RB25DE
JUDGEMENT
Cut off each injector signal one at a
time using CONSULT.
Ignition switch: ON Turn the cooling fan "ON" and "OFF
using CONSULT.
0 lgnition switch: ON (Engine stopped) . Turn the fuel pump relay "ON" and
"OFF using CONSULT and listen to
operating sound. CHECK
ITEM (REMEDY)
If trouble symptom disappears, see
CHECK ITEM. : ~,"~~,,,~scOnnectOr Oxygen sensor
Engine speed changes according to the
opening percent.
. Harness and connector IACV-AAC valve
If trouble
symp:orn disappears, see
CHECK ITEM. : Sensor 0 Fuel injectors
If trouble symptom disappears, see
CHECK ITEM. 0 Adjust ignition timing (by moving
camshaft position sensor)
Engine runs rough or dies.
Harness and connector Compression Injectors 0 lgnition coil with power transistor Spark plugs
Cooling fan moves and stops.
Hamess and connector Cooling fan motor Cooling fan relay
Fuel pump relay makes the operating
sound.
. Harness and connector Fuel pump relay
VALVE
TIMING
SOL
SWIRL CONT SOL
VALVE
0 RB20DE (UB)
SELF-LEARNING
CONT
PURG VOL CONTN
Checks control items and output circuit by arbitrary ON/OFF operation.
. In this test, the coefficient of self-learning control mixture ratio returns to the original coefficient by touching "CLEAR" on the
screen.
. Harness and connector EVAP canister purge control solenoid
valve
Vacuum hose
0 Engine: Run engine at 2,000 rpm. . Turn the EV~P canister purge control solenoid valve and using CONSULT and listen for operating
sound. EVAP
canister purge control solenoid
valve makes an operating sound. Check
vacuum signal for EVAP canister purge ~~~~~~a'cuum exists. VC OFF ... Vacuum does not exist.

TROUBLE DIAGNOSES
CONSULT (Cont'd) --
CHECK ITEM (REMEDY)
FUNCTION TEST
ITEM CONDITION
JUDGEMENT
-
PWIST SIGNAL Locked position
Neutral position
Ignition
switch: ON
(Engine running)
Power steering oil pressure switch
circuit is tested when steering
wheel is rotated fully and then set
to a straight line running position. ON
OFF Harness and connector
Power steering oil pressure switch GO
CIRCUIT a Power steering oil pump
I VlAS SN CIRCUIT
0 RB20DE (UB),
RB25DE
The variable air intake system is
diagnosed by checking for opera-
tion of the actuator.
-
SWRL CONT SN
CIRCUIT
0 RB20DE (UB)
The air jet swirl control system is
diagnosed by checking for opera-
tion of the actuator.
-- -- -
a Vehicle speed sensor circuit is
tested when vehicle
is running at
a speed of 10 km/h (6 MPH) or
higher.
After warming up, idle the engine.
Ignition timing is checked by read-
ing ignition timing with a timing
light and checking whether it
agrees with specifications.
Harness and connector 877
Vehicle speed sensor
Vehicle
speed sensor input
signal is greater than 4 krnlh
(2 MPH).
VEHICLE SPEED
SEN CKT Speedometer
RS
Adjust ignition timing (by moving
camshaft position sensor or dis-
tributor)
HA
Camshaft position sensor drive
The
timing light indicates the
same value on the screen.
IGN
TIMING
ADJ
mechanism
la INJECTION SYS (Injector, fuel
pressure regulator, harness or
connector)
IGNITION SYS (Spark plug, igni-
tion coil, power transistor harness
or connector)
VACUUM SYS (Intake air leaks)
Oxygen sensor circuit
Oxygen sensor operation
Fuel pressure high or low
Mass air flow sensor
Air-fuel ratio feedback circuit
(injection system, ignition system,
vacuum system, etc.) is tested by
examining the oxygen sensor out-
put at 2,000
rpm under non-
loaded state. Oxygen sensor COUNT
More
than
5 times during 10 sec-
onds
MIXTURE
RATIO
TEST
- -- /
POWER BALANCE
Injector circuit (Injector, harness or
connector)
Ignition circuit (Spark plug, ignition
coil, power transistor harness or
connector)
Compression
Valve timing
After warming up, idle the engine.
Injector operation of each cylinder
is stopped one after another, and
resultant change in engine rotation
is examined to evaluate combus-
tion of each cylinder. (This is only
displayed for models where a
sequential
multipart fuel injection
system is used.)
D After warming up, idle the engine.
D IACV-AAC valve system is tested
by detecting change in engine
speed when IACV-AAC valve
opening is changed to
0%, 20%
and 80%. Difference
in engine speed is
greater than 25 rpm before
and after cutting off the injec-
tor of each cylinder.
Harness and connector
IACV-AAC valve
Air passage restriction between air
inlet and IACV-AAC valve
IAS (Idle adjusting screw) adjust-
ment
Difference
in engine speed is
greater than 150
rpm
between
when valve opening is at 80%
and at 20%.
IACV-AACN
SYSTEM
ECM PART NUMBER
Part number of the ECM equipped on the vehicle
can be read.
ECM: 2371 0-XXXXX
ECM-TCM: 23740-XXXXX

TROUBLE DIAGNOSES
Symptom Matrix Chart
RELATION BETWEEN CONTROL ITEMS AND SENSORSfACTUATORS
@: High possibility to control damage 0: Low possibility to control damage
Sensors and actuators
1$1$1$ r I I
Crankshaft position sensor 1@1@1@
Ring gear crankshaft position sensor
[RB20DE (UB)] @
Mass air flow sensor
I Engine coolant temperature sensor I 0 I @ I 0 i I
Heated oxygen sensor 0
Knock sensor
Vehicle speed sensor
e? - 01 0
Throttle position sensor 000 C. $ Turbo pressure sensor (TIC) 0 0
Refrigerant pressure sensor
START
lgnition switch
@ 0
IGN 000
Air conditioner switch
Parklneutral position switch
Power steering oil pressure switch
Electrical load switch
Battery
voltage
0
injector @GO I
I power transistor I I I Ignition system I I I lgnition coil I I I I
AAC valve
Fuel DumD relav
. . I I I
2 o ECM & IGN coil relay I@l@l@ 1 I I % Auxiliary electric fan relay 3 - 2 Air conditioner relay
Canister purge control valve
0
Variable valve timing control solenoid valve
Variable air intake control solenoid valve
, (NA) Air jet swirl control solenoid valve
[RB20DE (UB)] 0
Turbo pressure control solenoid valve
(TW
FPCM (TIC)
%' Dropping resistor (TIC) 2. I I 5 Air regulator
Canister 0