ignition NISSAN 300ZX 1984 Z31 Electrical System User Guide

METER AND GAUGES - Digital Type Combination Meter
Speed Sensor Signal Check
SPEED SENSOR OUTPUT CHECK
When speedometer
is functioning properly, this
test
is not necessary. Go to "Meter Output check"
1 Remove cluster lid A
2 Connect a voltmeter between @ and @ on
cornbination meter side. Combination meter
harness connector should remain connected to
instrument harness
Switch ignition switch from "OFF" to
"ON"
Voltmeter should indicate approximately 5
volts when switch is "ON"
If voltmeter indicates no voltage, go to "Power
Unit Check".
3
SEL745D
4
5
Turn ignition switch to "OFF"
Disconnect speedometer cable from speed
sen-
sor and remove speed sensor with harness con-
nected.
6. Disconnect combination meter harness from
instrument harness
as shown below, and con-
nect
a voltmeter across @ and @
Voltmeter SEL746D
7
8
Turn ignition switch "OFF" + "ON"
Slowly turn speed sensor rotor shaft with a
suitable screwdriver to make sure voltmeter
pointer deflects
Do not turn rotor shaft quickly as voltmeter
deflects
24 times per revolution of rotor shaft
SEL747D
If voltmeter pointer does not deflect, replace speed
sensor.
EL-54

METER AND GAUGES - Digital Type Combination Meter
Speed Sensor Si!
METER OUTPUT CHECK
Combination meter emits speed sensor signal to
control
E C.C.S. control unit, A.S.C D. control
unit, voice warning
unit and AIT control unit.
Disconnect speedometer cable from speed sen-
sor and remove speed sensor with harness con-
nected 1
2 Remove cluster lid A.
3 Disconnect combination meter harness from
instrument harness
as shown, and connect an
ohmmeter between @ and 0
Ohmmeter
SEL748D
11 Check (Cont'd)
4
5
Turn ignition switch "OFF" + "ON".
Slowly turn speed sensor rotor shaft with a
suitable screwdriver to make sure ohmmeter
pointer deflects.
Ohmmeter pointer deflects twice for each rotatton
of rotor shaft
Ohmmeter -
SEL7490
If ohmmeter pointer does not deflect, go to
"Speed Sensor Output Check". (Refer to back
paw)
EL-55

METER AND GAUGES -Digital Type Combination Gauge
Combination Gauge
CAUTION:
Never touch the combination gauge terminal with bare hands
Digital type combination gauge should not be disassembled
ON or START IGNITION SWITCH
FUSE ~
PFUSE L-l
I
1
ACCELERATION
ILLUMINATION
EL-57

METER AND GAUGES -Digital Type Combination Gauge
Trouble-shooting
(+)
v
Check power supply circuit for combination
gauge
(-1
l°K 1 NG
Replace combination gauge Check harness
Voltmeter terminal I Ignition switch position
Approx Approx
@ I 03 I OV I 12v ! 12v
Continuity exists @ I gK:d I
Remove radio and A/C control assembly from
center console and remove combination gauge
with harness connected
Check from harness rtde
SEL681D
Display illumination will not darken when light
1 switch is "ON"
I Check light switch circuit for combination gauge I
1 Remove radio and A/C control assembly
and remove combination gauge with har-
ness connected.
Turn ignition switch to
"OFF"
Turn light switch to "ON"
Measure voltage across @ and @
2
3
4
Ignition switch - 0
ht switch - ON
SEL682D L
EL-59

METER AND GAUGES -Digital Type Combination Gauge
Trouble-shooting (Cont'd)
v
IGo to "Direction Sensor Amplifier Output Check" I
1 NG v
Check for loose harness
connector to
amplifier
Check for loose harness
connector to combmatlon
Replace combinatlon gauge Replace amplifier
I
1 Remove radio and AIC control assembly
from center console Remove combi-
nation gauge with harness connected
2. Turn ignition switch to "ON"
3 Check to determine if voltage IS produced
across
0 and @
SELSBSD
ACCELERATION & MILEAGE METERS
deceleration
Does speedometer operate?
1 No
Check harness between
combination gauge and
speed sensor Replace speed sensor
lNG
Replace combination gauge
Mileage meter registers "0" or abnormal value
I
Does speedometer operate?
Replace speed sensor
Check fuel injection pulse circuit for combination
gauge
I NG v
Check harness between
Replace combination
gauge combination gauge and
E F I control unit
IOK
EL-62

METER AND GAUGES -Digital Type Combination Gauge
@@6
100
100
100
100
010
010
010
010
001
001
001
001
000
000
000
000
- Direction Sensor Amplifier -
Output Check
Connect direction sensor amplifier harness (if
disconnected)
Using a directional magnet, determine the
direction in which car faces. Check voltage
across terminals
as indicated in chart below
Turn ignition switch to
"ON"
- Compass input Check
Remove radio and A/C control assembly from
center console and remove combination gauge
with harness connected
Check voltages across terminals
as indicated in
chart below
Turn ignition switch ON
Ch
SEL6870
Voltmeter (-1
terminal (+)
NW
NNW
N
NNE
NE
ENE
E
ESE
SE
SSE
S
ssw
sw
wsw
W
WNW
1 Morethan4V
0 Lessthan 1V
I -
@ -
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1 -
-
8 -
0
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0 -
-
@ -
1
0
1
1
1
1
0
1
1
0
1
1
1
1
0
1 -
-
-
1
1
0
1
1
0
1
1
1
1
0
1
1
0
1
1
-
-
0 -
1
1
1
0
0
1
1
1
1
1
1
0
0
1
1
1 -
CAUTION:
Before performing voltage measurements, ensure
that there IS no equipment or facility which would
produce powerful magnet lines
in the vicinity of
vehicle.
N
NNW? I rNNE
WNW ENE
. ,
w4w Ek-E
SEL688D
EL-63

01 L OIL OIL
PRESSURE TEMPERATURE PRESSURE SENSOR SENSOR SENSOR
I
BOOST
SENSOR
v) m r
P 0
%
@ f$& BODY GROUND
m
h
(Instrument harness)
FUSE
BLOCK J
COMBINATION GAUGE
VOLTMETER
GAUGE
4
GAUGE
BOOST METER
TRIMMER
IGNITION SWITCH
ON or START
I G (Main harness)
Turbocharger
model
Nom turbocharger
model
A/T model
M/T model
3
m
-I
m
rn
D
z
U
0
D
C
0
rn
ui
I
z
(D (D Q
T
-I Y
0 (D
0 0
3
0
¶ 9)
¶
9) c
0
(D
-.
E
G)

METER AND GAUGES -Needle Type Combination Gauge
Oil Temp. Sensor Check
1 Warm up engine
2
3
Stop engine and turn ignition switch OFF
Check resistance of
oil temp sensor
SEL695D
- Boost Gauge Trimmer Adjustment -
When boost gauge does not give proper reading,
adjust
0 kPa (0 mmHg, 0 inHg) point with the
trimmer located on interlor upper wall of glove
box
Use a screwdriver to adjust trimmer
For checking oil pressure sensor and boost
sensor, refer to pages EL-53 and 56
EL-70

VOICE WARNING SYSTEM
Operational Check
Fuel level
I Condition I Voice Warning -~ ~
Item
Fuel level less than
1OP (2-5/8USgal, - “Fuel level is low’’
2-1/4 Imp gal) ~~
Left
door
Door switch L H is “ON“
(Left door is open)
ignition switch
“OFF” Light
Door switch L H is
”ON”
(Left door is open)
Lighting switch is “ON” “Lights are ON”
“Left door is open”
Speed switch is “ON”
Vehicle speed is more
than
10 km/h (6 MPH)
Door switch R H is
”Right door is open”
Parking brake switch Parking brake is “ON” ”Parking brake is ON”
e If rhe warning is not properly given under the above condition, go to “Trouble-Shooting”.
EL-78

VOICE WARNING SYSTEM
Trou ble-shooting
Voltmeter
Condition
1 Ignition sw "ACC"
Check if speaker in driver's door
produces sound wheri radio
is
turned "ON"
Ignition sw "OFF"
Normal
i
Check harness connector run-
ning to driver's door speaker
Lighting switch "ON"
Check voice warning switch
CNG>
More than 9V
Replace voice warning switch i
v
Disconnect connector running to voice warning device and check voltage
at each terminal of connector
I- I I
I OK T
Replace voice warning device
I NG i
Check harness
EL-79