NISSAN 300ZX 1984 Z31 Electrical System Repair Manual

METER AND GAUGES -Digital Type Combination Gauge
Trouble-shooting (Cont'd)
Go to "Direction Sensor Check"
Arrow will not illuminate, but N, E, W. S and scale
Will
No
Direction of arrow will not change when vehicle
moves in
its direction
I
Yes
I Go to "Direction Sensor Amplifier Output Check" I.-
No
Move vehicle to a place that
is free from magnetic fields
and check to
see if compass
functions normally
I NG v
Replace direction Replace direction
sensor amplifier sensor
1 GO to "Compass Input Check" I
I NG T I OK T
Replace combination Check harness between
gauge compass and amplifier
All arrows illuminate
v
Go to "Compass Input Check"
T I OK ! NG
Replace combination Check harness between
gauge compass and direction
sensor amplifier
Part of display does not appear
I
Go to "Direction Sensor Amplifier Output Check"
I NG !OK T Replace combination Replace direction
gauge sensor amplifier
EL-61

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

METER AND GAUGES -Digital Type Combination Gauge
@ Io
Direction Sensor Check
Disconnect harness connector from direction
Measure resistance values between terminals
sensor amplifier
on harness side
Approx 20.35.Q
Resistance
0
alol Approx 20.35.Q ~
Approx 1O.ZO.Q
SEL689D compartment R H )
- Direction
Sensor Installation -
When installing direction sensor in the vehicle,
face
it in the direction as shown in figure
below
r Markins
SELJ4ZD
EL-64

METER AND GAUGES -Needle Type Combination Meter
Combination Meter
pj
0, SENSO
35 36 31
1 TACHO-
METER
BBpgBW *Em 8EAR
FUEL BELT DOOR BRAKE CHARGE OIL RADIATO HEAD- STOP&
COOLANl LAMP TAIL LAMP
0 32 -- a: "E NATION 30
ILLUMI-
0 33 -U 18 19 20 s;14 15 5 23
24 2. 29 1 3 4 11
SEL690D
EL-65

METER AND GAUGES -Needle Type Combination Meter
Tacho, Fuel and Water Temperature Gauges/Wiring Diagram
C z >= oc
:E
I
6$ m
L
m
_I
I I
Y - m -
llllllI
1:
I
I1 I01 I I I IIIIIIII
r-
SELSSlD
EL-66

METER AND GAUGES -Needle Type Combination Meter
Ohmmeter
terminal
,+) , ~-, 1 Float position
Fuel Tank Gauge Check
For removal, refer to FE section
Resistance value
Full
00 EmpN
112
Approx 652
Approx 8052
Approx 30 - 3552
More than 6052
Less than 652
Main gauge
Sub gauge
SEL6750
SEL67SD
,-Speed Sensor Signal Check
Speed sensor is built into the speedometer
Turn speedometer slowly using small screw-
driver, and check continuity of speed sensor
circuit
Continuity exists two times for each turn . 0 K.
SEL696D
--Speedometer Cable Removal -

Press to
L? connect
SEL692D
EL-67

METER AND GAUGES -Needle Type Combination Gauge
Combination Gauge
I
2
P I To boost sensor
z c
+ 0 i m 0
Y
-
b 4
SEL693D
EL-68

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