1998 NISSAN GT-R ignition

COMBINATION METER
Trouble Diagnoses (Cont'd)
VEHICLE SPEED INPUT SIGNAL DIAGNOSIS
I Connector
WARNING LAMP CHECK Does ABS warning lamp remain ON with
ignition switch ON?
ABS I
Perform ABS self-diagnosis
and check faulty circuit.
Refer to
BR section ("ABS
SYSTEMn).
Continuity exists.
Terminal No. 19 and ground:
No continuity
. -- I I
HARNESS CHECK ' Disconnect ABS control unit connector
(TK24)
and meter connector (TK20
Brown).
Terminals No. 19 - 24:
OK
El f
Meter control unit connector on vehicle
NG+'
I - = 'ELF0970D
El
@EM
Meter control unit connector on vehicle rn
rm-1 ffee
1
L / - - -
ELFo971D -
ABS control unit to meter
harness is faulty.
Meter control unit
is faulty. VEHICLE SPEED INPUT SIGNAL
CHECK 1 Connect meter connector (TK20 Brown). Terminal No. 19 and around:
'2
" Approx. 9V
OK
r9 v
VEHICLE SPEED INPUT SIGNAL
CHECK 2 Connect ABS control unit connector
(TK24).
Start the engine and drive the vehicle. Terminal No. 19 and ground:
Specification
Refer to "Combination Meter InpuffOutput
Signal Specificationsn on the next page.
OK
Meter control unit is faulty.
5' Pelform ABS self-diagnosis and check faulty circuit.
Refer to BR section ("ABS
SYSTEMn).

COMBINATION METER
Combination Meter
InputlOutput Signal
Specifications
Terminal No. Measuring condition
Signal name
Ignition switch Operation or condition
Disconnect ECM connector. Approx.
8 - 10V
At 2.000 rprn: Approx. 3.OV
IVI
15
10
5 0
ELF0973D
Tachometer drive
signal
Engine is idling or running at
!,000 rpm. RB25DET
At ~dling: Approx. 7.2V At 2.000 rprn: Approx. 72V
(VI
(VI ST
15 I5 10 10
5 5
0 0
RS
ELF0974D RA
Refer to "Component Parts Inspection" (EL-27).
Approx. 12V I
-uel gauge signal
OFF With TCS
Vehicle speed: Approx. 40 km
(VI
15 10 5 0 -5 -1 0 -1 5
A Veh~cle Speed Approx 60 kmh
Body
lrounc
Speedometer is in operation.
Vehicle speed is approx.
10 kmh.)
Vehicle speed is approx.
i0 kmh.)
e speed
inpi
Without
TCS Vehcle speed: Approx. 40 k
IV!
15 10 5 0
h Vehicle speed: Approx. 60 kmh (V) 15 10
5
0
ELF0376D
-
-
;peedometer is not in opera-
on.
hermal
transmitte
iignal Refer
to "Component Parts Inspection"
(EL-27)
gnition power sup
'IY Approx. 12V
Approx. 4.8V or OV
Vehicle speed is approx. 40 kwh: Approx. 2.4V (Vi d!!!!!!!!!] ,
rehicle speed sign 2 pulses) ipeedometer
is in operation.
Vehicle speed is approx.
0 kmm.)
Voltage the
part
of the indicates the value checked with an )gue circuit tester

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

TRIPLE METER
Triple Meter InputlOutput Signal Specifications
Component
Parts Inspection
Terminal No.
1
4
9
10
14
17
BOOST SENSOR
Connect handy vacuum pump (special service tool) to boost
sensor.
Apply battery voltage (12V) to terminal No. 1 and connect ter-
minal No.
3 to the ground. Then, measure voltage between
terminal No.
2 and the ground.
I I - I Refer to "Component Parts Inspectionn.
Signal
name
Boost sensor signal
Illumination
power
supply
illumination ground
Ground ignition power supply
Oil temperature sensor signal
Pressure
kPa (mmHg) I Voltage V
I
- pp Atmospheric pressure Approx. 2.2
-47 (-350) 1 Approx. 1.4
-
Specification
Approx. 2.2V
Approx. 12V
Approx. OV
Approx.
OV
Approx. 12V
Measuring condition
OIL TEMPERATURE SENSOR
lgnition
switch
ON
OFF
ON
ON
ON
Remove oil temperature sensor from the vehicle and measure
resistance as shown
left.
Operation or condition
0 mmHg
Lighting switch: 1
ST
-
-
-
Oil temperature "C
Approx. 70
-- - - --
Resistance R
Approx. 92.0
Approx. 90
Approx.
110
Approx. 130 - -- Appro~. 48.5
Approx. 27.3
Approx. 16.3
Approx. 150
Approx. 10.2
CAUTION:
Always use new engine
oil.

IGNITION KEY WARNING BUZZER AND LIGHT WARNING BUZZER
I Behind combination meter
Meter control unit Component Parts Location
J
Circuit Diagram
Meter Control Unit
InputlOutput Signal
Specifications
Terminal No.
Driver door switch signal
Signal
name
OFF Measuring condition
Ignition switch
I Measuring method Specification
Driver door switch
29
ON (Open)
OFF (Closed)
42
Approx. OV
Approx. 12V
Ignition power supply
54
55
Key-in detection switch
signal 1 OFF
ON
Lighting switch signal
Ground Approx. 12V
Remove
the ignition key.
Insert the ignition key. Approx. OV
Approx. 12V
Approx. 12V
Approx. OV
Approx. OV
I
OFF
ON Lighting
switch: 1 ST ON
OFF
-

FRONT WIPER
Front wiper amplifier
Component Parts Location
Circuit Diagram
Front wiper motor Front wiper and washer
SW
Washer motor
---------------- HI
EL-17040
Front Wiper InpWOutput Signal Specifications
Terminal No.
Signal name 1 Measuring condition. I
Wiper motor position detection
signal
1 Specification
Wiper switch: LO position
Ignition switch
(Reference)
I
Operation
Wiper motor LO signal
4 Wiper motor HI signal
Wiper switch
6
ON
OFF
.
Lo
7 1 Washer operation detection signal I ON
8 I Ignition power supply I ON I - I Approx. 12V
Approx. 12V
ADDIOX. OV
-
Wiper switch
I
Washer motor is in operation. I I
I - Ground
Approx.
OV
I Washer motor is not in operation. OFF
HI
. .
Approx. OV
ON
Approx.
12V
Approx. 12V
Approx. OV

REAR DEFOGGER AND HEATER MIRROR
Component
Parts Location
-- Behind combination meter
Circuit Diagram
Heater
10 A g28 81 1
Meter CIU
Rear defogger relay AIC auto ampl~f~er
. 0
z i 8 Rear defogger SW a (AC controller built-m)
mirror
u
Rear defogger TK20 (Brown) TK20 (White)
EL-2181 D
Meter Control Unit InputlOutput Signal
S~ecif ications
': It changes to approximately 12V when 15 minutes or 30 minutes pass after the ignition switch is turned ON.
Terminal No.
9
17
29
55
63
NOTE: Refer to "Auto Amplifier InputlOutput Signal Specifications".
Signal name
Battery
Rear defogger switch
signal
Ignition power supply
Ground
Rear defogger relay
control signal Specification
Approx.
12V
Approx. OV
Approx. 5V
Approx. 12V
Approx. OV
Approx. OV*
Approx. 12V
Measuring condition .
Ignition switch OFF
OFF ON
ON
ON Operation
-
Rear
defogger switch ON (with switch
pressed)
OFF (regardless of
connection of AIC auto
amplifier)
-
-
Rear defogger switch ON OFF

WIPER DEICER
Component
Parts Location
Wiper deicer switch I
/ I Wiper deicer switch
Circuit Diagram
m
Wiper deicer relay
Wiper deicer Wiper deicer
SW (Timer
built-in) lighting
Wiper
Deicer Switch InputlOutput Signal
Specifications
Terminal No. Signal name
Indicator power supply Measuring
condition .
Ignition switch I Operation Specification
Wiper deicer switch
2
3
OFF
ON
4
- Approx. OV
Approx. 12V
lllumination ground
Ground
5
1 Approx. 12V lgn~tion power supply
6
OFF
ON
Wiper deicer relay control
signal
I ON 1 Wiper deicer switch
ON
*: When
the wiper deicer is activated (approx. 15 minutes).
Illumination power supply
-- -
- - - - - -
ON
OFF
- Approx. OV
Approx. OV
Approx. OV'
Approx. 12V
OFF Lighting
switch: 1ST -- - Approx. 12V