check engine NISSAN 300ZX 1984 Z31 Heather And Air Conditioner Workshop Manual

DESCRIPTION-Air Conditioner (Manual)
Refrigerant Leak Warning System
The refrigerant leak warning system, used in con-
junction with the low-pressure switch, protects the
cooler cycle from damage due to continued opera-
tion of the
air conditioning system when there is a
shortage of refrigerant
It also indicates when to re-
plenish the refrigerant
Refrigerant leak
warnmg lamp Recirculation switch
Air conditioner switch
control lever
SHA227B
I ll I
SHA2286
When the refrigerant in the cooler cycle is insuffi-
cient,
it vaporizes quickly inside the evaporator As
a result, the "super heat" of the refrigerant at the
outlet of the evaporator increases
If it exceeds the
specified level [Approximately 45°C
(8l0F)1, the
super heat switch turns on, allowing the current to
flow through the timer If current continues to
flow through the timer for the specified length of
time, the timer activates to close the contacts
which turn on the warning lamp
Leak warning lamp check
Conduct a continuity test in the leak warning lamp
circuit.
1) Turn ignition switch "ON" (with engine off) to
make sure warning lamp illuminates.
2) Start engine. Warning lamp should go out if the
amount of refrigerant
is sufficient.
EXPLANATION OF SUPER HEAT
When a liquid under constant pressure inside a
cylinder is heated, it apparently changes in three
different
states The relationship between the tem-
perature of the liquid (refrigerant) and
its volume,
which
uses the pressure as a parameter, is shown in
the graph below.
1) The temperature of the liquid rises along the
saturated liquid line (a -+ b or a + b')
2) When the temperature of the liquid reaches a
certain level, evaporating bubbles quickly ap-
pear This mixture of liquid and vapor contin-
ues to take place, during which the tempera-
ture remains constant until the
last droplet of
liquid vaporizes. Points c and c' where the
entire liquid vaporizes, are located on the
saturated vapor line (b
+ c or b -+ c').
3) When the liquid is further heated, the tempera-
ture of the vapor
rises again and its volume also
increases.
The volume will continue to increase
as the temperature is increased
We call this vapor "super heated vapor" (c + d
or c'
+ d')
The line between points c and c'
is called the
"saturated vapor line."
HA-I 0

DISCHARGING, EVACUATING, CHARGING AND CHECKING
0 (0)
300 /1,000)
Evacuating The System
1. Start pump, then open both valves and run
pump for about 20 minutes
-. -
101 3 (760.29 92)
98
0 (735.28 94)
To high-pressure serwce valve To low-pressure
600 (2,000)
Vacuum pump
94 6 (710.27 95)
SHA241 B
900 (3.000)
2. When low gauge has reached approx 101 3 kPa
(760 mmHg, 2992 inHg), completely close
both valves of gauge and stop vacuum pump
Let
it stand for 5 to 10 minutes in this state
and confirm that the reading does not rise.
a. The low-pressure gauge reads lower by 3.3 kPa
(25 mrnHg, 0.98 inHg) per 300 rn (1.000 ft)
elevation Perform evacuation according to the
following table.
91 3 (685.26 97)
I
Vacuum of system*
kPa
(mmHs. inHal
Elevation
m (ftl
* Values show reading of the low-pressure gauge
b. The rate of ascension of the low-pressure gauge
should be less than
3.3 kPa (25 mmHg, 0.98
inHg) in five minutes.
- Charging
1 Evacuate refrigerant system
2
Close manifold gauge valves securely and dis-
connect charging hose from vacuum pump
3 Purge air from center charging hose
1) Connect center charging hose to refrigerant can
through can top
2) Break
seal of refrigerant can and purge air
SHA2428
4 Charge refrigerant into system
WARNING:
Ensure that engine is off.
1) Open high- and low-pressure valves of manifold
gauge and charge refrigerant into system
SHA243B
HA-I 3

PIPING, COMPRESSOR MOUNTING AND F.I.C.D.
Idle Speed Adju
FAST IDLE CONTROL DEVICE (F.1.C.D )
1
2
Run engine until it reaches operating tempera-
ture.
With air conditioning system
OFF (when com-
pressor
is not operating), make sure that engine
is at correct idle speed
3 With air conditioning system ON (Recircula-
tion switch
at "RECIRC" position, fan control
lever
at "HI" position), make sure that com-
pressor and
F I C D solenoid valve are func-
tioning properly
For non-turbocharged model,
set idle speed at
the specified value
For turbocharged model, make sure that idle
speed is at the specified value (Nonadjustable)
4
Non-turbocharged model
F I C D socket pin 0
solenoid valve
Turbocharged model
solenoid valve
SHA248B
ng and Checking
ENGINE IDLING SPEED
NO"-
model
Turbocharged
model Tranrmission turbocharged
When AIC 86 OFF
MIT rpm 650-750 650 - 750
650.750 600.700 AIT rpm at "0" range at "D" range
When AIC IS ON
MIT rpm 750-850 750 - 850
750.850 750.850 AIT rpm at "D" range at "0" range
HA-22

COMPRESSOR OIL--For MJS170
Checking and Adjusting
The oil used to lubricate the compressor is circulat-
ing with the refrigerant
Whenever replacing any component of the system
of
a large amount of gas leakage occurs, add oil to
maintain the original amount
of oil
Total amount of oil in the system:
150 mP (5.1 US fl 02, 5.3 Imp fl 02)
KV994A9690
KV992C50822 /
i;(V994A9690 SHAO17A
1
2
3
Connect oil separator KV994A9690 between
compressor discharge
side and condenser
Evacuate and charge the system
Operate compressor
at engine idling with air
conditioner
set for maximum cooling and high
fan speed
4 Stop compressor operation after 10 minutes
Never allow engine speed to exceed idling speed
CAUTION.
Do not continue compressor operation for more
than 10 minutes
5 Disconnect oil separator and connect refriger-
ant line
to original positions
6 Disconnect low flexible hose from compressor
suction
valve
7 Add new oil from compressor suction port
Amount of oil to be added:
120 mP (4.1 US fl oz,4.2 Imp fl 02)
Low pressure ride
SHA702
0 Oil remains unremoved in the system about 30
mP (1.0 US fl 02, 1 1 Imp fl 02).
8 After adding oil, rotate compressor clutch by
hand 5 to 10 turns
9 Connect refrigerant line and evacuate and
charge system
10 Conduct leak
test and performance test
11 Gradually loosen drain cap of oil separator to
release residual pressure Remove cap and drain
Oil
12 To prevent formation of rust and intrusion of
moisture or dust, perform the following before
placing oil separator kit into storage
1) Cap each opening of flexible hose and double
union securely
2) Cap oil separator, evacuate it from service
valve, and charge refrigerant
HA-23

A/C ELECTRICAL COMPONENTS (Manual)
Inspection (Cont'd)
Applied voltage to
solenoid (V)
0
1 Disconnect vacuum hose @
2 Disconnect vacuum hose 3 and connect hose
@ instead Suck in through hose @ to con-
firm that
air does not flow through the hose
and that check
valve is closed
While sucking vacuum hose
0, change voltage
to solenoid to check for openclose operation
of solenoid valve
3 ~~
Operation of solenoid
valve
Close
12 1 Open ~ ~~ ~
Pressure
switch check for turbocharged model
I Pressure I Resistance In1 I
Atmospheric
presswe
Vacuum pressure
more than 46 7 kPa 1350 mmHg, 13 78 mHg1
SHAZ55E
1. Disconnect vacuum hose @ from the terminal
and connect
a vacuum handy pump with the
same terminal
2. Check pressure switch using a vacuum handy
pump.
VACUUM PUMP MOTOR
1 Turn ignition switch "OFF" Disconnect
vacuum hose
@ (Refer to "Pressure Switch
Check") from vacuum tank and connect
it
again
2 Make sure air conditioner switch is "OFF"
3 Turn ignition switch "ON" (Do not start the
engine)
4 Push cruise control main switch to make sure
vacuum pump starts. (A sound should
be heard
from the pump
)
5 The vacuum pump is operating properly if it
stops within 20 seconds after it has started
6 If it fails to stop within 20 seconds, and
vacuum hoses are in good order, it is malfunc-
tioning
SOLENOID VALVE
Perlorm operational check, referring to the "Table
of operation of solenoid valve in Air Flow (page
HA-3) and Wiring Diagram (page HA-8 or HA-31)
HA-33