Page 945 of 1701
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EC-226
Page 946 of 1701
ENGINEANDEMISSION CONTROLOVERALLSYSTEM
System Diagram
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SEF306R
EC-227
Page 947 of 1701
ENGINEANDEMISSION CONTROLOVERALLSYSTEM
ECCS Component PartsLocation
EGR valve
IACV.air regulator
EGRC-BPTvalve
Injector
IACV.AAC valve
IACV.FICD solenoidvalve
Engine coolant temperature sensor
Knock sensor Pressure
regulator
Heated oxygen
sensor Camshaft
positionsensor,
ignition coiland power
transistor builtintodistributor
EC-228
SEF307R
Page 948 of 1701
ENGINEANDEMISSION CONTROL OVERALLSYSTEM ~
ECCS Component PartsLocation (Cont'd)
Engine coolant temperature sensor
IACV.FICD solenoidvalve
•
IACV.air regulator
Knock sensor
SEF308R
EC-229
Page 949 of 1701
ENGINEANDEMISSION CONTROLOVERALLSYSTEM
ECCS Component PartsLocation (Cont'd)
Camshaft
L
position
sensor
Metal tipofignition coiltower
(Terminal ofsecondary coilcircuit)
NOTE: Powertransistor, camshaftpositionsensor,
and ignition coilhave tobe replaced asa
distributor assembly.
EC-230
Terminal
forignition coil
SEF853NA
Page 950 of 1701
ENGINEANDEMISSION CONTROLOVERALLSYSTEM
Vacuum HoseDrawing
Pressure regulator
VIEWA
Throttle body~
5
EGR valve
&
EVAP canister
purge control solenoid valve
(1)
Pressure regulator tovacuum
gallery
@
Airduct tovacuum gallery
@
EVAP canister (vacuum line)to
vacuum gallery
@
EVAP canister (purgeline)to
intake manifold collector /-
Vacuum gallery
A
@
Throttle bodytoEGR valve
&
EVAP canister purgecontrol
solenoid valve
@
EGR valve
&
EVAP canister
purge control solenoid valveto
vacuum gallery
(J)
EGR valve
&
EVAP canister
purge control solenoid valveto
vacuum gallery
EC-231 EGR
valve
VIEW B
EGRvalve
SEF309R
@ Intake manifold collectorto
vacuum gallery
@
EGRC-BPT valvetoEGR tube
@
EGRC-BPT valvetovacuum
gallery
@ EGR valve toEGRC-BPT valve
•
Page 951 of 1701

ENGINEANDEMISSION CONTROLOVERALLSYSTEM
System Chart
Camshaft positionsensor Fuel
injection
&
mixture ratio
•
I
I
control Injectors
Mass airflow sensor
I
Distributorignitionsystem
r
~1
Power transistor
Engine coolant temperature
.
sensor
I
IACV-AAC valveand
Idle aircontrol system
IACV-FICDsolenoidvalve
Heated oxygen sensor
I
IACV-airregulator control
~--..j
IACV-air regulator
I
Ignition switch
I
I
Throttle position sensor
~-+
Fuel
pump control Fuel
pump relay
ECM
(ECCS
control
Neutral position/Inhibitor
.
module) Heatedoxygen sensor
switch monitor
&
on-board diagnos-
~-+
Malfunction
indicatorlamp
tic system (On
theinstrument panel)
I
Air conditioner switch
t~
EGRvalve
&
EVAP canister
1---+
EGR
valve
&
EVAP canister
purge control purge
control solenoid valve
Knock sensor
.....
Frontheated oxygen sensor Front
heated oxygen sensor
Battery voltage
.
heater
control heater
I
.
Power steering oilpressure
~
Coolingfancontrol
--
Cooling
fanrelay
switch
Vehicle speedsensor
.....
Airconditioning cutcontrol Air
conditioner relay
EC-232
Page 952 of 1701

ENGINEANDEMISSION BASICCONTROL SYSTEMDESCRIPTION
Multiport FuelInjection (MFI)System
INPUT/OUTPUT SIGNALLINE
Camshaft positionsensor
Mass airflow sensor
Engine coolant temperature sensor
Front heated oxygen sensor
Throttle position sensor
Neutral position/lnhibitor switch
I
Vehicle speedsensor
Ignition switch
Air conditioner switch
Battery Engine
speedandpiston position
Amount ofintake air
Engine coolant temperature
Density ofoxygen inexhaust gas
Throttle position
Throttle valveidleposition
Gear position
I
Vehicle speed
Start signal
Air conditioner operation
Battery voltage ECM
(ECCS
control
module) Injector
•
BASIC MULTIPORT FUELINJECTION
SYSTEM
The amount offuel injected fromthefuel injector
is determined bythe ECM. TheECM controls the
length oftime thevalve remains open(injection
pulse duration). Theamount offuel injected isa
program valueinthe ECM memory. Theprogram
value ispreset byengine operating conditions.
These conditions aredetermined byinput signals
(for engine speedandintake air)from boththe
camshaft positionsensorandthemass airflow
sensor.
VARIOUS
FUELINJECTION
INCREASE/DECREASE COMPENSATION
In addition, theamount offuel injected iscom-
pensated toimprove engineperformance under
various operating conditions aslisted below.
<
Fuel increase>
• During warm-up
• When starting theengine
• During acceleration
• Hot-engine operation
• When selector leverischanged from"N"to
"0" (AfT models only)
• High-load operation
<
Fuel decrease>
• During deceleration
EC-233