1984 NISSAN 300ZX Electrical System Workshop Manual

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
Wiring Diagram
lOUlN03
m m
.? I
@q .
w-@ I I
SEL680D
EL-58

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)
Compass will not indicate direction in which vehicle is being driven COMPASS
I
Face vehicle toward the North to make sure arrow points to "N"
Display deviates
by one graduation
. more graduations
Display deviates by two or
. 1 SIOWI~ turn volume 0 until arrow moves from
@ (0) to @ (@I Thenslowlyreturn
volume
@ until arrow points to point @
When arrow deviates toward West, move switch
@ to (+),when it deviates toward the East,
move switch to
(-) Return switch @ to
Neutral when arrow stays between points
@)
and @
I Face vehicle toward the East to make sure arrow points to "E" 1
Display deviates
SIOWIV turn volume @ until arrow moves from
(Q (0) to @ (@I Then slowly return
volume
@ until arrow points to point @
1 Display deviates by two or
. more graduations
switch @to (+I, when it deviates toward the
South, move switch
to (4 Return switch @
to Neutral when arrow stays between points
(Q and 0
I Again face vehicle toward the North to make sure arrow points to "N" 1
Direction sensor amplifier (Located on luggage compartment R H 1 , ,
Dirplav
SEL683D SEL684D
EL-60

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