1998 NISSAN GT-R Service Manual

METER
Triple Meter
REMOVAL AND INSTALLATION
b Screw (2)
DISASSEMBLY AND ASSEMBLY
s EC. 248 Behind triple meter
(373
C : Triple meter attaching screw (5) t
c : Front cover attaching screw (6)
Front
meter

COMBINATION METER
System Description
Speedometer, tachometer, odoltrip meter, fuel gauge, and
water temperature gauge are integrally controlled by the con-
trol circuit in the meter control unit.
Diagnosis function has odoltrip meter segment check, low fuel @
warning lamp check, and continuity check in the meter control
circuit and the meters (speedometer, tachometer, fuel gauge,
and water temperature gauge).
Component Parts Location
Combination meter ABS unit
ID Transfer (4WD) I H side of trunk room
I -unit connector I
/I Diagnosis Function
meter is displayed, turn the ignition switch ACC or
down the odoltrip meter switch, turn the ignition switch
/
ON.
3. Verify that 0000.0 km is displayed on the trip meter.
4. Press the odoltrip meter switch 3 times within 5 seconds.
5. All the odoltrip meter segments light up along with low fuel
warning lamp.
EL-21
SEGMENT CHECK AND LOW FUEL WARNING LAMP
CHECK

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
Trouble
Diagnoses
DIAGNOSTIC PROCEDURE
I YES
Meter control unit is faulty.
Meter battery or ignition power supply is faulty.
DO
warning
lamps
on
the
meter light
up?
. No .
at the low fuel warning lamp check? The bulb
is faulty.
t
Meter control unit is faulty. I
Does the liquid crystal display operate properly at the segment check? NO
Check the attaching screw for the ' NG *F3epair malfunct~oning part and
the meter circuit check? meter that
does not operate properly. * conduct the meter circuit check again.
OK
Meter control unit is faulty.
YES
DIAGNOSIS RESULT 1
4
Symptom I Check item I Malfunctioning item
Go
to "DIAGNOSIS RESULT
1".
Low fuel warning lamp does not operate
properly. Go to
"DIAGNOSIS RESULT
2".
Any of tachometer, fuel gauge, and water
temperature gauge does not operate prop-
erly.
More than one meter out of tachometer, fuel
gauge, and water temperature gauge do not
operate properly.
Speedometer and
odohrip meter do not
operate properly. Sensor
or harness for the meter that does
Sensor circuit for the meter (warning lamp)
1 1: 1 not operate properiy
1 that does not operate properly
~ Meter control unit
Meter control unit
DIAGNOSIS RESULT 2
Symptom
Any of speedometer, tachometer, fuel gauge,
and water temperature gauge does not oper-
ate properly. Vehicle
speed sensor or harness
Meter control unit
-
Vehicle speed input signal (with TCS)
Check item
I Malfunctioning item
NG
OK
Perform "VEHICLE SPEED INPUT SIGNAL
DIAGNO-
SIS"
on the next page. (without TCS)
More than one meter out of speedometer,
tachometer, fuel gauge, and water tempera-
ture gauge
do not operate properly. Resistance
of the meter that does not
operate properly
Meter control unit
NG
OK
- -
Meter that does not operate properly
Meter control unit

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

COMBINATION METER
Component Parts Inspection (Cont'd)
Fuel gauge unit harness
connector
Lower side
<
I
I
I
(Full) Lead switch
harness connector
on fuel gauge unit
h L Upper side
Harness connec:or on lead sw~lch
With fuel
T/f Without fuel
Lower side
(Empty)
FUEL GAUGE UNIT
Remove fuel gauge unit from the vehicle.
Check the gauge resistance on the gauge with the fuel gauge
at Empty and then Full.
SD
LEAD SWITCH
Remove fuel gauge unit from the vehicle.
Check continuity between terminals on the lead switches in the
tank.
Terminal No.
1-3
Termina! No. I Condition I Continuity
Float position
Full
Empty
THERMAL
TRANSMITER
Resistance R
Approx. 6 max.
Approx. 80 min.
5 - 7 6-7
0 When the engine has warmed up to approx. 80°C, measure
resistance between thermal transmitter and body ground.
Specification: Approx. 76 - 90Q
There is no continuity when approx. 26 of fuel is left in the sub fuel tank.
With fuel
Without fuel Yes
No