Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan 300ZX 1984-1985,1988,1990,1994-1996 Approved 1984 Engine Fuel & Emission
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ENGINE FUEL &
- EMISSION CONTROL SYSTEM
-
SECTION EFaEC
CONTENTS
PRECAUTIONS .. . . EF&EC- 2
COMPONENT PARTS LOCATION . EF&EC- 3
E C C S DIAGRAM ... EF & EC- 4
E C C S CHART . . EF&EC- 6
ECC.S WIRING DIAGRAM . . .. . . EF&EC- 8
FUEL FLOW SYSTEM DESCRIPTION . . . .. EF & EC-10
AIR FLOW SYSTEM DESCRIPTION .... .. EF & EC-11
E C C S. DESCRIPTION .... ... .. .. .. , EF&EC-13
DIAGNOSTIC PROCEDURE . . . EF & EC-28
SE LF-D IAGNOSIS . . ... EF & EC-35
ELECTRONfC CONTROL SYSTEM INSPECTION EF & E C 4 3
MIXTURE RATIO FEEDBACK SYSTEM INSPECTION . , EF & EC-60
FUEL SYSTEM INSPECTION EF & EC-63
TURBOCHARGER . ... . . EF & EC-66
INJECTOR COOLING FAN (VG30ET) . EF & EC-69
PRESSURE REGULATOR CONTROL EF & EC-72
CRANKCASE EMISSION CONTROL SYSTEM .. .. . . EF & EC-74
EXHAUST EMISSION CONTROL SYSTEM . . ... EF & EC-75
EVAPORATIVE EMISSION CONTROL SYSTEM ... , EF&EC-76
SERVICE DATA AND SPECIFICATIONS (SD S ) . . . . . .. EF & EC-79
PRECAUTIONS
Always use 12 volt batteries as * Do not disassemble E C C S When installing large capacity wire-
power source control unit less equipment or a vehicle phone, be
Do not attempt to disconnect Do not turn diagnosis mode sure to obsetve the following as it
battery cables while engine IS selector may adversely affect electronic con-
operating trol systems depending on its installa-
\
tion location
1) Keep the antenna as far as possible
away from the electronic control
units
2 ) Also keep the antenna feeder line
more than 20 cm (7 9 in) away from
T
the harness of electronic controls
Do not let them run parallel for a
long distance
3) Adjust the antenna and feeder line so
Do n o t apply battery power that the standing-wave ratio can be
directly t o injectors keot smaller
Do not remove the fuel tem-
perature sensor from the \
pressure regulator
Replace as an assembly \
J
Do not operate fuel pump when
there i s no fuel in lines
Do not use anti-freeze agents i n fuel
0 Do not reuse fuel hose clamps
0 Tighten fuel hose clamps sufficiently
Securely connect E C C S harness
Handle air flow meter care- connectors
fully t o avoid damage * Do not disassemble auxiliary A poor connection can cause an ex-
Do not disassemble air flow air control valve (VG30ET tremely high (surge) voltage to
meter engine) develop in coil and condenser, thus
Do not clean air flow meter resulting in damage t o IC circuit
with any type of detergent Keep E C C S harness at least 10 cm
0 Even a slight leak i n the air in- / ( 3 9 in) away from adjacent
take system can cause serious harnesses, t o prevent an E C C S
problems
& %$&
& $? system malfunction due to reception
o f external noise, degraded operation
o f IC circuit. etc
Do not depress accelerator Keep E C C S parts and harnesses
Do not shock or j a r the crank pedal when starting dry
angle sensor Immediately after starting, do Before removing parts, turn o f f igni-
not rev up engine unneces- tion switch and then disconnect
sarily battery ground cable
Do not rev up engine just prioi
to shutdown SEF6008
EF & EC-2
COMPONENT PARTS LOCATION
ECCS conlr01 unit
I A A C (valve
(VG30ET engine)
SEFBOlB
EF & EC-3
E.C.C. S. DIAGRAM
VG30E Engine (Without turbocharger)
SEF602B
EF & EC-4
E.C.C.S. DIAGRAM
VG30ET Engine (With turbocharger)
L
SEF603B
EF & EC-5
E.C.C.S. CHART
VG30E Engine (Without turbocharger)
Crank angle sensor -
\ I
Fuel injection &
Injectors
mixture ratio control
V I 1
1
Ignition timing control Power transistor
Exhaust gas sensor t
Idle-up control Idle-up solenoid valve
ECCS
b control
unit
E G R control E G R control solenoid valve
Throttle valve switch -b
Air conditioner switch
1 t
%el pump control Fuel pump
-1 I
ixhaust gas sensor
Inspection lamps
nonitor & self-diamosis
Battery voltage
EF & EC-6
E C.C.S. CHART
.
VG30ET Engine (With turbocharger)
Fuel injection &
Injectors
mixture ratio control
-
Air flow meter c
Cylinder head temperature sensor b
Ignition timing control Power transistor
b
Ignition switch b
- d I
Idle speed control
Y L
Auxiliary air control
(A A C ) valve
I
Throttle valve switch
I b
E C C.S
control
unit
b
E G R control E G R control solenoid valve
Park/Neutral switch
Air conditioner switch
I Fuel pump control Fuel pump
b
I
b
ixhaust gas sensor
Inspection lamps
nonitor & self diagnosis
EF & EC-7
E.C.C.S. WIRING DIAGRAM
i-
1 U I
=
e
Y
2
EF & EC-8
E.C.C.S. WIRING DIAGRAM
I '
.
.
...
SEF747B
EF & EC-9
FUEL FLOW SYSTEM DESCRIPTION
Fuel pump and damper
' iFueirank
SEF604B
The amount of fuel t o be injected is determined by intake manifold
the injection pulse duration as well as by a pressure
0vacuum
difference between fuel pressure and intake mani-
fold vacuum pressure. The E.C C.S. control unit
controls only the injection pulse duration For this
reason, the pressure difference between the fuel
pressure and intake manifold vacuum pressure a From fuel tank
should be maintained a t a constant level Since the Fuel chamber
intake manifold vacuum pressure varies with engine
operating conditions, a pressure regulator IS placed
in the fuel line to regulate the fuel pressure in
SEF605B
response t o changes in the intake manifold vacuum
Fuel presswe
pressure
EF & EC-10
AIR FLOW SYSTEM DESCRIPTION
VG30E engine (Without turbocharger) up roleno,,, FlCD
Valve
r
0 Intake air flow
C Exhaust gar flow
Air cleaner
VGJOET engine (With turbocharger)
Vacuum control valve
Emergency relief valve
0 Intake air flow
Exhaust gar flow
cleaner
Turbbne
-
Turbocharger unit- \Compresor SE F 608 B
EF & EC-11
AIR FLOW SYSTEM DESCRIPTION
TURBOCHARGER EMERGENCY RELIEF VALVE
The turbocharger is installed on the exhaust mani- To prevent an abnormal rise in supercharging
fold This system utilizes exhaust gas energy to pressure, and possible engine damage, in case the
spin the turbine wheel which is directly connected by-pass valve fails t o open properly, an emergency
t o the compressor wheel The compressor supplies relief valve is provided as a safety device on the
pressurized air through the throttle chamber into intake manifold
the intake manifold Thus, the turbocharger in-
When the p r w r e in t h e When the prerrura tn the
creases charging efficiency and thereby increases Intake mandold IS below intake mandold ISabove
power and torque. 52 0 kPa 1390 mmHg. 520 kPa 1390 mrnHg,
15 35 inHgl 15 35 mHg)
To prevent an excessive rise in the supercharging
Upper cover
pressure, the turbine speed is maintained within a Atmosphere
safe range by controlling the amount of exhaust
gas that passes through the turbine This system
consists of a by-pass valve which allows some of
the exhaust gas t o by-pass the turbine and to flow
directly into the exhaust tube
Charged air pressure Charged air pressure
SEF6lOB
Engine speed
b =F
= i
From exhausi man2fold 0 Superchargang pressure 41 hqh
To intake
From
air flo
meter
h
2 Bygars valve controller
3 Compressor
4 Turbine
SEF609B
EF & EC-12
E.C.C.S. DESCRIPTION
E.C.C.S. rnponents
E C C.S. CONTROL UNIT Crank angle sensor has rotor plate and wave form-
The E C C S control unit consists o f a micro- ing circuit Rotor plate has 360 slits for 1" signal
computer, connectors for signal input and output (engine speed signal) and 6 slits for 120" signal
and power supply, inspection lamps and diagnostic (crank angle signal) Light Emitting Diodes
mode selector The control unit controls the ( L E D ) and Photo Diodes are built into wave
amount of fuel that is injected, ignition timing, idle forming circuit
speed, E G R , fuel pump operation, and feedback When signal rotor plate passes the space between
of the mixture ratio the L E D and Photo Diode, the s l i t of the signal
rotor plate alternately cuts the light which is sent
t o the photo diode from the L E D This causes an
alternative voltage and it is then converted into an
on-otf pulse b y the wave forming circuit, which IS
sent t o the control unit
Sealed mwr
Rotor head
.-- ?
Lighremitring
diode I-. -
'- .
1- -
;--
,
I
.
.
7
A . l l l
-. . l -
. -, _ , I
-
i:--,
-
.
J
-
SEF611B
. i r - .I
CRANK ANGLE SENSOR
Crank angle sensor is a basic signal sensor for the
Phatodlodel
4,,
fi-. 1 ,h
h-
Wave forming-'
entire E C C S I t monitors engine speed and piston circurt
'-Rotor piate
position, and it sends signals t o the E C C S con- SEFBlJB
trol unit for control of fuel injection, ignition
timing, idle speed, fuel pump operation and E G R
operation.
Rotor plate
SEF614B
EF & E C - 1 3
E.C.C.S. DESCRIPTION
E.C.C.S. Components (Cont'd)
AIR FLOW METER
The air flow meter measures the mass flowrate of
intake air. Measurements are made in such a man-
ner that the control circuit emits an electrical out-
put signal in relation to the amount of heat dissi-
pated from the hot wire placed in the stream of
intake air.
I SEF615B
E F I relay
Battery source
-
E l
-
- 6
Output voltage
31 27 35 1
Variable resistor
A w30 ECCS 6
Air flow meter comroi
-
Ground
0 . 25 unit
Self-cleaning ignition switch
F- 12 34
Ground
C
-
SEFSlSB
The air flowing around the hot wire removes the I
heat from the hot wire The temperature of the hot Temperature
compensation resistor
wire is very sensitive to the mass flowrate of the
air. The higher the temperature of the hot wire, the
higher i t s resistance value This change in the twire
temperature (or. resistance) IS determined by the
mass flowrate of the air. The control circuit ac-
curately regulates current (I) in relation to the
varying resistance value ( R H ) so that V A always
equals VB The air flow meter transmits an output
for voltage VA to the control unit where the
output is convened into an intake air signal.
RH Hot wore reststance
RK Temperature campenration resistance
RA. RB Constant reSiiIanCe
SEFS17B
I
EF & EC-14
E.C. C. S. DESCRIPTION
E.C.C.S. Corn1 nents (Cont'd)
Self-cleaning The cylinder head temperature sensor, built into
the cylinder head, monitors changes in cylinder
After engine i s stopped, the E C.C S control unit
head temperature and transmits a signal t o the
heats up the hot wire t o approximately 1,OOO"C
E C C S control unit
(1,832"F) to burn out dust which adhered t o the
The temperature sensing unit employs a thermistor
hot wire
which i s sensitive t o the change in temperature
Electrical resistance of the thermistor decreases in
response to the temperature rise
Thermmor
-
-
5 rec 1 rec
SEF618B
Self-cleaning operation
U
SEF6208
Condition Operation
_____~ ~
After running engine a t above 1,500 rpm EXHAUST GAS SENSOR
After driving vehicle at above 20 kmlh
(12 MPH) Operates
Cylinder head temperature is more than
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