Gauge cluster NISSAN 300ZX 1984 Z31 Electrical System Workshop Manual

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
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