NISSAN 300ZX 1984 Z31 Electrical System Service Manual

METER AND GAUGES - Digital Type Combination Meter
combination Meter
CAUTION:
No electrical terminal should be touched wlth bare hands.
EL-41

METER AND GAUGES - Digital Type Combination Meter
Combination Meter (Cont'd)
--
Power ""lt
To power unit
12 13 14 15 24 30 16 17 18 19 20 21 22 6 21 28
40
45 55 46 47 48 49 50 51 53 54
;I4 E
i
SE L661 D
EL-42

FUEL TANK GAUGE (Main1
'I
SI
01
74
I -0 I
A FUSE
__Izt___l

METER AND GAUGES - Digital Type Combination Meter
Wiring Diagram
EL-44

METER AND GAUGES - Digital Type Combination Meter
Wiring Diagram (Cont'd)
GY LIR
tiT POWER
TACH0 & TORDUE METER
SPEED METER
SEL663D
EL-45

METER AND GAUGES - Digital Type Combination Meter
Display Check
EL-46

METER AND GAUGES - Digital Type Combination Meter
-
(+) (-) OFF
Display Check (Cont'd)
a Digital combination meter is provided with a
self-check function to determine whether or
not meter itself
is malfunctioning.
Test procedure
(1) While pushing trip reset switch A, switch igni-
tion switch from
"OFF" to "ON" Trip reset
switch
A should remain pushed in until self-
check operation start
(2) Meter starts to automatically perform self-
check. Segments for meters and gauges should
illuminate one after another.
(3) If any particular segment remains off, corn-
bination meter
itself is faulty.
ACC ON -Preparation for Trouble-shooting -
0

Approx
12v 0 ov ov
SEL665D
a
Remove instrument switch
a Remove cluster lid A
Remove nut which holds instrument switch
- Trouble-shooting
I Go to "Display check" I
1 NG
power source circuit unit
-IF' L-IF-NG
Replace meter and
gauge assembly
Check for loose
harness connector
Voltmeter terminals Ignition switch position
Ohmmeter terminals
Ignition Switch OFF
Continuity exists ground
a Disconnect meter harness connector as shown
below
.
SEL744D
-
EL-47

METER AND GAUGES - Digital Type Combination Meter
Trouble-shooting (Cont'd)
Replace meter
and gauge assembly
Speedometer does not operate
Go to "Display Check"
Check harness between
speed sensor and meter
OK
Go to "Power
Unit Check"
T T Replace meter Replace
and gauge assembly power Unit
Go to "Speed Sensor Signal Check" to check speed
sensor output
Go to "Display Check"
Go to "Power
Unit Check"
OK
Replace meter Replace
and gauge assembly power unit
.
1 Check ignition coil circuit I
and gauge assen
1'
T lNG Replace meter Check resistor, ignition
and
gauge assembly coil and power transistor
(Refer to ignition system)
1 Disconnect meter harness connector
2
3 Check terminal voltage between @ and
(white)
Turn ignition switch to
"ON".
0
VOltmeter SEL6660
EL-48

METER AND GAUGES - Digital Type Combination Meter
Trouble-st
Torque meter does not operate
1 Go to "Display Check" I
Go to "Power Unit Check"
v
Replace meter Replace
and gauge assembly power unit
I
I Check boost sensor circuit I
boost sensor and meter boost
sensor
1 Disconnect meter harness connector
2 Connect vacuum pump gauge to boost
3
4
(white)
sensor vacuum hose
Turn the ignition switch to "ON"
Apply vacuum pressure to boost sensor by
vacuum pump gauge and measure voltage
across
0 and
Vacuum -
~eep harness connected
J wu 1 3v at-53 3kPa 1-400 mmH
SEL667 Voltmeter -15 75 mHg) '
rg (Cont'd)
Main fuel gauge does not operate
I
Go to "Display Check"
Go to "Power Unit Check"
Replace meter Replace
and gauge power unit
assembly
Check fuel tank main gauge clrcult
I OK
Replace meter
and gauge
assembly Go to "Fuel tank
gauge check"
.
Check harness between Replace fuel
fuel tank gauge and meter
tank gauge unit
1 Disconnect meter harness Connector
(black)
Turn ignition switch to
"OFF" 2
3 Measure resistance between @ and @
e

Ohmmeter SEL6680
EL-49

METER AND GAUGES - Digital Type Combination Meter
Trouble-shooting (Cont'd)
Fuel residue
Sub fuel gauge (digital display1 does not operate
Go to "Display Check"
Go to "Power Unit Check"
Replace meter Replace
and gauge power unit
assembly
Resistance
Check harness
Check fuel tank sub gauge circuit
Go to "Fuel Tank
Gauge Check"
OK
v T
Replace Check harness between Replace meter
fuel tank fuel tank gauge and meter and gauge
gauge unit assembly
FUEL INJECTION PULSE CIRCUIT
CHECK
1 Disconnect meter harness connector
(black)
2. Turn ignition switch to "ON"
3 Check for voltage across @$ and 0.
Voimeter SE L669 t
FUEL TANK SUB GAUGE CIRCUIT
CHECK
1 Turn ignition switch to "OFF"
2. Measure resistance between 0 and 0.
Ohmmeter
Ignition switch- OFF
More than ZOQ Less than 4R
SEL670D
EL-50