cooling NISSAN 300ZX 1984 Z31 Engine Fuel And Emission Control System Workshop Manual

ENGINE FUEL &
- EMISSION - CONTROL SYSTEM
SECTION EFaEC
CONTENTS
PRECAUTIONS ..
COMPONENT PARTS LOCATION
ECCS DIAGRAM
. . .
ECCS CHART ..
ECC.S WIRING DIAGRAM . . ..
FUEL FLOW SYSTEM DESCRIPTION .
AIR FLOW SYSTEM DESCRIPTION ....
E C C S. DESCRIPTION . . . . ...
DIAGNOSTIC PROCEDURE . ..
SE LF-D I AGNOSIS ..
..
.. ..
..
..
..
...
ELECTRONfC CONTROL SYSTEM INSPECTION
MIXTURE RATIO FEEDBACK SYSTEM INSPECTION
. ,
FUEL SYSTEM INSPECTION
TURBOCHARGER
. ... ..
INJECTOR COOLING FAN (VG30ET) .
PRESSURE REGULATOR CONTROL
CRANKCASE EMISSION CONTROL SYSTEM
. . . .
EXHAUST EMISSION CONTROL SYSTEM . . ...
EVAPORATIVE EMISSION CONTROL SYSTEM . . .
SERVICE DATA AND SPECIFICATIONS (S DS). . . . . . .
. . EF&EC- 2
. EF&EC- 3
EF & EC- 4
EF&EC- 6
EF&EC- 8
.. EF & EC-10
EF
& EC-11
, EF&EC-13
EF
& EC-28
EF
& EC-35
EF
& EC43
EF & EC-60
EF
& EC-63
EF
& EC-66
EF
& EC-69
EF
& EC-72
. . EF & EC-74
EF
& EC-75
, EF&EC-76
EF & EC-79

E.C.C.S. DESCRIPTION
Battery voltage Battery
~-
Headlarnp switch Load signal
Cooling fan switch
Power steering oil pressure switch
Idle-up Control (VG30E engine)
Start signal Ignition switch
ECCS
control
unit
The idle speed is compensated by the E C C S
control unit to prevent rough idle when any of the
following conditions
are met
The control unit senses the idle condition, and
determines
ON/OFF signal The signal from con-
trol unit
is transmitted to the idle-uD solenoid valve
to stabilize idle speed.
Condition
During engine start
20 seconds after engine start
Battery voltage is below 12V
Headlarnp switch ON
Cooling fan switch ON
Power steering oil pressure switch ON
Except above
Idle-up solenoid
operation
ON
OFF
EF 8t EC-24

INJECTOR COOLING FAN (VG30ET)
-2
INJECTOR
COOLING
FAN MOTOR
The injector cooling fan operates to cool down the
temperature of fuel inside the injector and the fuel
gallery when engine is stopped under high engine
temperature condition
Operation 1
I
-1
lgnltl.3" ON
OFF switch
FANMOTOR TIMER UNIT
- - 3 6
Water I ON temperature witch
motor Fa" OFF 'PI OFF
Fa" motor OFF I
I About 17 monutes
SEF7296
OFF
Operation 2
ON Ignition switch OFF
ON
I iI
Water temperature witch OFF ~
Abut 17 minuter
SEF730B
Operation 3
ON I ON , Ignition twitch OFF
SEF7326
EF & EC-69

INJECTOR COOLING FAN (VG30ET)
Inspection
START
T
Disconnect water temperature switch harness connector
and connect the terminal to ground with
a jumper wire
I
Turn ignition switch
I OFF+ON+OFF L
1
I
Make sure that cooling fan motor starts to operate 1 NG I IOK I
1
Check harness for continuity ~~
[ Perform
component check
COMPONENT CHECK
A Fan motor
1 Make sure that continuity exists between
terminals of fan motor
SEF734B
2. Apply battery voltage to the terminals of fan
motor. If fan motor
does not operate, replace
SEF7358
EF & EC-70

INJECTOR COOLING FAN (VG30ET)
lnspectio
B. Fan motor timer unit
Check the timer unit with a battery source and
a bulb (12V-3W). following the procedure
below
,,-Fan motor timer unit
1 Connect terminal @ to negative terminal of
power source, terminal @to
test lamp terminal
and the other
test lamp terminal to negative
terminal of the power source
2. Connect terminal @ to positive terminal of
power source
Test lamp does not glow ..... OK
Test lamp glows ......... N.G
3 Connect terminal @ to positive terminal of
power source and disconnect it (Operate
timer)
4 Connect terminal @ to negative terminal of
power source
Test lamp glows ......... OK
Test lamp does not glow . N G.
5. Make sure that test lamp should remain on for
about 17 minutes after step 3 is performed,
and then go out.
6. While test lamp is on, connect terminal @to
positive terminal of power source.
Test lamp goes out .... OK.
Test lampdoesnotgoout . . NG
(Corrt'd)
C \Mater temperature switch
1 IRemove water temperature switch
SEF737B
2 Check water temperature switch for proper
operation
Operating temperature:
OFF + ON 80°C (176°F)
SEF738B
EF & EC-71