1998 NISSAN GT-R low oil pressure

TROUBLE DIAGNOSES
Symptom Chart
Sharp shock in Engine brake
applied
Shifting
Malfunctions
Slip
(Racing)
hifting
.- erator pedal
Shifting
Shifting
inspection item
Fluid level and status
Control linkage
PNP switch (short/open circuit)
Throttle ~osition sensor (installed)
I Vehicle weed sensor
I Enaine meed sensor
A/T fluid temperature sensor
Engine idle speed
Line
Dressure
Control valve assembly
Shift solenoid
A
Shift solenoid B
Line pressure solenoid
Lock-up solenoid
Overrun clutch solenoid
Accumulator N-D
Accumulator
1-2
Accumulator 2-3
Accumulator 3-4 (N-R) Ignition coil and starter motor
Overdrive control switch
I AfT mode switch (AUTO)
Torque converter
1 Oil pump
I Reverse clutch
I High clutch
I Forward clutch
I Forward one-wav clutch
I Overrun ciutch
1 Low one-wav clutch
I Low reverse brake
Brake. band (including servo)
Parking linkage

Symptom Chart (Cont'd)
Greater noise
Malfunctions
Inspection item No shifting
I Shifting I
Fluid level
and status 11
Control linkage
-
(I) C 0 .- c. .- (I) 0 a
v
-CU
n - 1
PNP switch
(shortlopen
circuit)
Throttle position sensor (installed)
2 2
Vehicle speed sensor
I Engine speed sensor -
-T
L o 1 Control valve assembly .- - -- Shift solenoid A 4 3
. ' Shift solenoid 6 4 cut I1
--, Line pressure solenoid .- 5 -t Lock-up solenoid ?
6 Overrun clutch solenoid 3
Accumulator N-D
1 Accumulator 1-2 I 1-
Accumulator 2-3
Accumulator 3-4 (N-R)
Ignition coil and starter motor
I Overdrive control switch I 1-
A/T mode switch (AUTO)
A/T mode switch (POWER) I - I Ail mode switch (SNOW) I
I Torque converter I I
1 Oil pump I I -- - - Reverse clutch 0 -
'g High clutch a 4 6
%I Forward clutch I I - .- a Forward one-way clutch -
$ Overrun clutch a, 8
Low one-way clutch
O Low reverse brake 7
Brake band (including servo) 7
Parking linkage

TROUBLE DIAGNOSES
Symptom Chart (Cont'd)
xi - - ([I C V) a, C .- cn C W
t 0 .- .L 2 a, - 8 0 ([I L 0 0 Q
& 0 a, a, Q V)
5 E .- X
i! L a
zl -I - 1 -
- 2 -
-
-
-
-
-
5 - 3 - 4 -
-
-
-
-
-
-
-
-
-
-
-
-
I1 - 0 - 6 - 7 -
-
-
-
-
9 - 8 -
-
vj c 0 .- - .- V) 0 n
Q 7J C ([I
t C .- r ([I c. V) c. 0 C V) a 0 7J 0, C .- 0 C W -
- 2 - 3 -
-
- -
-
1 -
-
-
-
- - a +- ([I a a, 2 0 c. 0 C V) a, 0 u a, - 0 2
8 - 1 -
-
-
-
-
-
-
-
2 - 3 -
-
-
-
-
-
-
-
-
-
-
- I
i
g
- 4 -
-
-
-
-
-
-
B- ; 2 to a =? - 0,
2 5.j c 2.z 2 a0 - 0- z & 5 0 gE V) V)o C 02 .s nu 5 ng %-([I C O c --t .- V) a V) r aa ([I z gz a, a- c 50 -6 s
6 $2
11
2
I
I
Malfunctions
Inspection item
I I I Fluid level and status I I Control linkage 2
PNP switch (shortfopen circuit) 1 I I I Throttle position sensor (installed) 111213
Vehicle speed sensor
214
Engine speed sensor L -
AIT fluid temperature sensor
Engine idle weed
Line pressure
Control valve assembly
Shift solenoid A 3
3
Shift solenoid B 4 4
Line pressure solenoid
Lock-up solenoid
Overrun clutch solenoid
u I I I -
Accumulator N-D I I 1 I Accumulator 1-2
Accumulator 2-3 I Accumulator 3-4 (N-R)
Ignition coil and starter motor
Overdrive control switch
Torque converter
tg Reverse clutch .- High clutch
2 Forward clutch C .- a Forward one-way clutch -.
$ Overrun clutch 0, 8
? Low one-way clutch 3= O Low reverse brake 9
Brake band (including servo)
Parking linkage

COMBINATION METER
Diagnosis Function
(Cont'd)
METER CIRCUIT CHECK
After the segment check, press the odohrip meter switch to
verify that meters operate as shown below. (Low fuel warning
lamp goes off at this point.)
i
ELF0967D I It takes 1 minute for the meters to become stable.
DIAGNOSIS FUNCTION CANCELLATION
Turn the ignition switch ACC or OFF.
Meter-related Circuit Diagram
I I TO oil pressure W.L

COMBINATION METER
Combination Meter Input/Output Signal -
Specifications (~ont'd)
Signal name
Vehicle speed signal
(8 pulses)
Body
ground
Ground
I--
Oil pressure sensor
signal Measuring
condi!ion
operation.
Speedometer is in operation.
(Vehicle speed is approx.
40 km~h.)
Specification
Approx.
4.8V or OV
Vehicle speed is approx. 40
ELF0978D
-- - Approx. 2.4V
ON - Approx. OV
- I - I Refer to 'Component Parts Inspection" (EL-28).
J I I Voltage of the upper part of the wave form indicates the value checked with analogue circuit tester.
- Water Fuel gaugc
temperature gauge
1 Gauge indication with shorted
Gauge
indicaion with
3.4W test lamp connected
ELF0980D
Component Parts inspection
SPEEDOMETER, TACHOMETER, FUEL GAUGE AND
WATER TEMPERATURE
GAUGE
Remove each meter from the meter control unit and check the
resistance between the terminals as shown below.
Checkina terminal I
Speedometer and I Fuel gauge and water I Resistance R
B-D I B-C I Approx. 230 - 310
tachometer
A-C
OIL PRESSURE GAUGE
Disconnect oil pressure sensor connector.
Turn the ignition switch ON, and connect test lamp and lead
wire with the meter attaching screw as shown left. Check the
gauge indication.
temperature gauge
A-C
ADD~OX.
190 - 260

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)