turn signal NISSAN 300ZX 1984 Z31 Electrical System Workshop Manual

COMBINATION SWITCH
Intermittem WIPER
wimrvolume
WASH
TURN
Horn terminal RESUME
OFF
INT s
L
4
LO
HI
ASCD
LIGHTING SWITCH WIPER SWITCH INTERMITTENT
WIPER VOLUME AS C D SWITCH
HORN SWITCH
TURN
SIGNAL
SWITCH
-
SEL64ZD
EL-23

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
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 -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

AUTOMATIC SPEED CONTROL DEVICE (A.S.C. D.)
Trouble-shooting (Cont'd)
Turn ignition switch to "OFF"
Disconnect speedometer cable from trans-
mission
Connect an ohmmeter between
@ and
Slowly turn speedometer cable pinion by
hand to make
sure ohmmeter pointer
deflects
Ohmmeter pointer deflects twice per
rotation
of pinion.
0.
Check from harness side
Ohmmeter SEL7630
i
Check speed sensor circuit
(Digital type combination meter) -
(Refer to "METER AND GAUGES
- Needle Type Combination Meter"
~~~l~~~ AS c D
control unit
Check harness between A S C D
control unit and speed sensor
signal output terminal
of
combination meter
Does speedometer operate properly?
Go to "Speed Sensor Signal Check"
for checking combination meter
(Refer to "METER AND GAUGES
- Digital Type Combination Meter" )
Replace
speed sensor Check harness between AS C D
control unit and speed sensor
signal output terminal of
combination meter
EL-I 00