Vacuum NISSAN 300ZX 1984 Z31 Electrical System Workshop Manual

METER AND GAUGES - Digital Type Combination Meter
Trouble-st
Torque meter does not operate
1 Go to "Display Check" I
Go to "Power Unit Check"
v
Replace meter Replace
and gauge assembly power unit
I
I Check boost sensor circuit I
boost sensor and meter boost
sensor
1 Disconnect meter harness connector
2 Connect vacuum pump gauge to boost
3
4
(white)
sensor vacuum hose
Turn the ignition switch to "ON"
Apply vacuum pressure to boost sensor by
vacuum pump gauge and measure voltage
across
0 and
Vacuum -
~eep harness connected
J wu 1 3v at-53 3kPa 1-400 mmH
SEL667 Voltmeter -15 75 mHg) '
rg (Cont'd)
Main fuel gauge does not operate
I
Go to "Display Check"
Go to "Power Unit Check"
Replace meter Replace
and gauge power unit
assembly
Check fuel tank main gauge clrcult
I OK
Replace meter
and gauge
assembly Go to "Fuel tank
gauge check"
.
Check harness between Replace fuel
fuel tank gauge and meter
tank gauge unit
1 Disconnect meter harness Connector
(black)
Turn ignition switch to
"OFF" 2
3 Measure resistance between @ and @
e

Ohmmeter SEL6680
EL-49

METER AND GAUGES - Digital Type Combination Meter
Power Unit Check
Voltmeter
terminal
(f) (-)
E -
-%; 0
0
@I
__
@
9
0
0
Remove power unit with harness connected
Perform voltage and continuity tests Refer to
chart below
I Voltage
[VI
Approx 12
Approx 5
Approx 16
Approx 5
Approx 22
Approx 285
Turn ignition switch to "ON"
1 - 1 More than 6
Remarks
Check when no
display appears
For speedometer
For tachometer
For Temp,
Oil, Volt
sause
For Fuel gauge
For "Trip", "Ave
speed"
& "Dirt to
empty" meter
Turn ignition switch to "OFF"
Ohmmeter
Continuity Remarks
Check when no
ground display appears
If specified voltage or continuity is not produced,
replace power unit.
- Boost Sensor Check
1 Connect vacuum pump gauge to boost sensor
vacuum hose
2 Disconnect harness connector from boost
sensor and connect battery and voltmeter
as
shown
3 Apply vacuum pressure to boost sensor by
vacuum pump gauge and measure voltages
Approx.
2.2V at 0 kPa (0 mmHg, 0 inHg)
(Atmospheric pressure)
Approx.
1 3V
at -53.3 kPa (-400 mmHg, -15 75 inHg)
vacuum pump gauge
SEL674D
EL-53

AUTOMATIC SPEED CONTROL DEVICE (A.S.C.D.)
-Preparation for Trouble-shooting Trouble-shooting
Remove AS C D control unit with harness AS C D control unit cznnot be set properly connected. I
Turn AS C D main switch "0FF"and then "ON"
to make sure indicator (located above combination
meter1 illuminates
Check for loose vacuum Check AS C D main
[-I switch and AS C D relay
Check power supply circuit for
A S C D control
unit SEL736D
Check stop switch. clutch
switch (MIT model).
inhibitor relay and
inhibitor switch (AIT model) POWER SUPPLY CIRCUIT CHECK
1 Release brake and clutch pedals
2 Turn ignition switch to "ON"
3 Turn A S.C.D main switch to "ON"
4. Check voltage between 0 and @ v Check harness between
AS C D power supply Check from harness side
-+ Release
A/T control -+ ..D" range
AS C D main wnch }-ON IOK Checksets:and
harness between control
unit and
set switch Voltmeter SELSlOD
SET SWITCH CIRCUIT CHECK
1. Turn ignition switch to "OFF". Go to "A S C D Actuator Check" -
2 Push A.S.C.D. set switch
3 Check continuity between 0 and @
Check from harness side
tion switch 4 OFF
C 0 ret switch + ON
SELBllD Ohmmeter
I
circuit
I Check set switch circuit for AS C D control unit 1
lNG Replace actuator !OK *
(Next page)
EL-99

AUTOMATIC SPEED CONTROL DEVICE (A.S.C. D.)
Trouble-shooting (Cont'd)
Resume switch will not operate
Replace AS C D
control unit Check resume switch
h Accelerate switch will not owrate 11
Check accelerate switch circuit
v v Replace AS C D
control unit Check accelerate swttch
Engine hunts
Q
Check vacuum hose for breakage, cracks or
fracture
OK lNG Repair or replace hose
v
Does AS C D wire move smoothlv7
I NG v OK
Repair or replace wire
I
I Go to "Actuator Check" I
OK lNG Replace actuator
.I
Replace A S C D control unlt
RESUME SWITCH CIRCUIT CHECK
1 Turn ignition switch to "OFF"
2. Turn resume switch to "ON".
3. Check continuity between @ and 0
heck from harness side
on witch -+ OFF
M 0 h rn rn el e r SEL6120
ACCELERATE SWITCH CIRCUIT CHECK
1. Turn ignition switch to "OFF".
2. Turn accelerate switch to "ON"
3 Check continuity between @ and @
Check from harness %de
ignition switch + OFF
Accelerator witch -+ ON
SEL6130 Ohmmeter -
Large difference between set vehicle speed and
actual speed
I v
Check AS C D wire and actuator move
smoothlv
1 NG Replace wire 01
actuator
Check vacuum hose for breakage, cracks or
I fracture
4 NG
I OK Repair or replace hose
I Go to "Actuator Check" 1
4 NG
Replace actuator c OK Replace A.S C D
control unit
EL-I 01

AUTOMATIC SPEED CONTROL DEVICE (A.S.C.D.)
- Trouble-shooting (Cont'd)
AIT model only
0 When A S C D is set while vehicle is operating
in
"0 D " range, 0 D will be cancelled and
shifting to
0 D cannot be made thereafter
0 While vehicle is being driven using AS C D in
"0 D "range, 0 D will not be cancelled even
if actual car speed is 6 kmlh (4 MPH) lower
than
set speed (Set speed cannot be main-
tained
)
1 Check 0 D cancel circuit for AS C D control unit I
Replace A S C D 0 Electroniccontrolled A/T
control unit Check harness between
lock-up control unit and
AS C D control unit
Check harness between
0 D. cancel solenoid.
i) D. cancel switch and
AS C D control unit
0 Conventional Ail
I
ELECTRONIC-CONTROLLED A/T
EQUIPPED MODEL (E4N71B)
Turn ignition switch to "OFF".
Check continuity between @ and @
Check from harness slde . .~
ignmon switch - OFF
SEL737D Ohmmeter
CONVENTIONAL A/T EQUIPPED
MODEL (4N71B)
Turn ignition switch to "ON"
Turn 0 D. cancel switch to "OFF".
Check voltage @ -0 and 0-0
Check from harness side A '- b9ndt'~~n~~~~i~hO_N 0 Fihz L
Approx 12v ,I { .__. _- I .__.__.__.- -' Volmeter SEL741D
A.S.C.D. Actuator Check
1. Check continuity between terminal @ and
Continuity exist
... O.K.
terminals 0, @ and 0.
CAUTION:
Do
not attempt to remove valves from actuator.
2 Connect battery (approx 12V) to harness
connector
of actuator as shown below, and
apply vacuum to actuator
If diaphragm moves smoothly, actuator IS O.K.
CAUTION.
When checking actuator by applying vacuum, do
not apply engine vacuum directly
as it IS too strong
to check actuator properly.
LA s c D actuator B,m, 112VI
SEL739D
EL-I 02

SEL740D
CAUTION:
a Be careful not to twist wire when removing it.
Do not tense wire excessively during adjust-
ment.
Without depressing the accelerator pedal, adjust
wire tension with adjusting nut
Wire free play (at throttle lever):
0 - 0.5 mm (0 - 0.020 in)
a For A S.C.D. stop switch and clutch switch
adjustment, refer to
BR and CL sections.
a For vacuum pump and tank check, refer to HA
sect ion.
EL-1 038

,
TO TIME CON-
TROL UNIT
TO INST H LH (CHIME)
TO ENGINE
ROOM
H R H (UPHOLD RELAY)
TO ENGINE ROOM H L H IHEAO-
TO LIGHT SW TO LIGHT SW -
TO REAR
ro KEY sw
3OOM H R H A S C 0 RELAY1 To As sw (VACUUM ROOM H L H
PUMP RELAY)
(For time control system, headlamp system, AS C 0 and E F I system1

@ To @ (Non-turbocharger models) 0 Ambient temp sensor 0 Vacuum tank (Turbocharger models)
0 To @I (Turbocharger models) 0 PoglampRH @ Hoodswitch
0 To @il White) @ Vacuumpump 0 I'oglampLH @ Hoadlamp washer motor
0 @D Horn L H
/ @ Side marker lamp L H
0 To @I (Blue) (Turbocharger models)
@ To @ White) 0 ranmotor
@ Uphold relay (Turbocharger models)
@ Fuublchk @ Headlamp motor R H
0 Front shock absorber R H @ Radiator coolant level switch 0 Hcadlamp L H
Front combmation lamp L H
A/T relay I @ AS C D relay (Non-turbocharger AIT models) @ Water cock an valve Compressor relay 0 Headlamp R H Vacuum pump relay @ Side marker lamp R H
(Turbocharger models) @ Horn RH Horn relay @ Front combination lamp R H
6 Headlamp tmer @ To @ (Blue) I@ To @ (White)
@Q To @ (White) @ To 0 (Non-turbocharger models)
@ Inhibitor switch (Non-turbocharger models)