1992 MAZDA 323 engine

F3 OUTLINE
OUTLINE
OUTLINE OF CONSTRUCTION
Theefuel and emission control system of the new 323 4WD model 1s basically the same as that of the prevr-
ous 323 4WD model; however some parts are changed. The changed parts and interchangable parts
are shown betow.
13EOF3-304
Changed parts
1 ~ components Contents and purpose Reference pagl
INTAKE AlR
SYSTEM Turbocharger
Intercooler
l Size Increased for greater boost pressure l Wastegate solenord valve IS lozated on Intake port of F3-10
turbocharger to make system more compact F3-37
Volume increased for Improved F3-10
t F3-39
Wastegate sojenold valve
l Wastegate solenoid valve changed to duty solenoid
type for Increased engine power and response
l Wastegate solenoid valve is located on Intake port of
turbocharger to make system more compact F3-1 f
F3-38
I r
Pressure regulator One-stage operattlon changed to two-stage operatron F3-14
to improve hot restarting f3-41
L
FUEL SYSTEM High-ohmic type change to low-ohmrc type with exter-
Fuel qector na solenoid reslstor for improved fuel supply during F3-12
high-speed driving F3-42
Fuel pump reslstor Resistance reduced for
surer fuel supply F3-40
CONTROL
SYSTEM Pressure
regulator control system
Atr flow meter Two-stage operatton used to Improve hot restarting
Measures larger amount of air flow Increased power
Resistance values changed F3-t4
F3-43
F3- 9
f3EOF3-305 lnterchangable parts
tntake air system
l
Air valve
l Air bypass valve
l Air cleaner
l Air cleaner element
Fuel system
l Fuel filter assembly
l Fuel pu.mp (transfer
l Fuel vapor valve Control system
. l Throttle sensor
l Water thermosensor
l Knock sensor and control unit
l Oxygen sensor
l Fuel pump control unit
l Main relay
l Circuit opening relay
l Check valve (two-way) .
Evaporative system
l Charcoal canister
l Check valve (two-way)
13EOF3-306
F3-4

CHECK VALVE SOLENOID VALVE
(PURGE CONTROL)
llll
*
SOLENOID VALVE
(PRC LOW TEMP.)
3 ~NTERCOOLERII’ I ,‘/ I
II II
’ f frrmvmlHHt-----lHt I -1 II II
IIt - --M:l, i -KNmK~[I~ ,
’ ISC VALVE
VALVE WATER CHAkCOAL
CANISTOR
CHECK VALVE
I FUEL FUEL FILTER
PUMP
I FUEL FILTER
TRANSFER
PUMP
AIRkLOW METER
(WITH INTAKE AIR THERMOSENSOR)
DISTRIBUTOR
CATALYTIC CONVERTER
l TO ENGINE CONTROL UNIT

OUTLINE F3
SPEClFiCATlONS
Iten
Idle speed’
tgnltion trming * Engine
m
BTDC BP TURBO
800 f 50
IO f 10
Fuel pump
Maximum output pressure kPa { kgflcm’, psi 1 1 490-736 {SO-7.5, 7t-110)
Transfer pump
Maximum output pressure
Fuel filter kPa { kgf/cm2, psi ) 1 , 39 10.4, 5.7 1 or higher
Nylon element (in fuel pump)
Idle-speed control (fSC) valve
Type
Resistance I Rotary
nt
11-13 [at 2O*C [68*F)]
Solenoid va tve (purge contra I)
,I
Resistance -2o*c I -4Of 1 14.6-I 7.8
2.21-2.69
.kQ , 2o”c { 68OF)
40% f104*f 1 1.0-l .3
Resistance
Fuel tank
Capacity
Air cleaner
Etement type
Fuel
Specification L {US gal, Imp gal) [ Approx. 6 [at 20°C f 68*FJ]
60 (15.9, 13.2)
01 permeated
Unleaded premium (RON 95 or higher)
11FrlC?.7 11
l TEN terminal of diagnosis connector grounded.
The I; mark indicates newly equipped Parts. l”L”l “VI I
F3-9

F3 TURBOCHARGERCONTROL
TURBOCHARGERCONTROL
OUTLINE
l The-capacity of the air-to-air intercooler is increased to reduce the intake air temperature and to the tm-
prove engine performance.
l With addition of the improved wastegate control system, the engine’s high rpm torque is increased.
TURBOCHARG
INTERCOOLER
SYSTEM DIAGRAM
WASTEGATE SOLENOrD VALVE
F3-10

TURBOCHARGERCONTROL F3
WASTEGATE CONTROL
The engine control unit controls the wastegate solenoid valve by duty signals to better control the boost
pressure, increasing the engine’s power and response.
*
13EOF3.313
System Diagram r
DUTY VALVE
INTAKE AIR THERMOSENSOR (AIRFLOW METER)

F3 FUEL SYSTEM
FUEL
SYSTEM
OUTLINE
l Thspressure regulator has two vacuum ports for its two-stage operation. (Refer to page F3-43.)
l The injectors are changed from high-ohmic type to low-ohmic type for improvement of the supply of fuel
during high-speed engine operation.
l To decrease the current in the injectors, an external resistor is equipped and is mounted on the aircleaner
housrng .
13EOF3315 Pressur regulator
VACUUM PORTS
F3-12 13EOF331;

F3 CONTROL SYSTEM
PRESSURE REGULATOR CONTROL SYSTEM
SOLENOID VALVE TO MAIN RELAY
(PRC HIGH TEYP.)
t ECU
I
PRESSURE REGULATOR
// VACUUM

IJ WATER
THERMOSENSOR
F----------- lNTAKE AIR
THERMOSENSOR
SWITCH SOLEltolD VALVE
(PRC LOW TEMP.)
TO FUEL TANK
13EOF3-31 To prevent vaporlock in the fuel system during hot restart idle, a two-stage pressure regulator is adoped
to the new 323 4WD.
Low temperature operation: The vacuum to the pressure regulator (A and B ports) is cut (solenoid valve
[low temp.] UN), and the fuel injection pressure is increased to 284 kPa (2.90 kgf/cm2, 41 psi ) ,
High temperature operation: The vacuum to the pressure regulator (A port) is cut (solenoid valve [high
temp.] ON), and the fuel injection pressure is increased to 343 kPa [ 3.5 kgf/cm2, 49 psi 1.
Condition and operation
Condition Operation
1
coolant Intake alt Solenoid vrlve Solenoid vatve Opemtlon
I temperature temperature Engine (Idw temp.)
(high temp.) time Operation 40% [fU40f)-
Above 90°C 5U°C (t22OFI ON OFF 180s Low temp.
f f940Fj No load
Above 5O*C
I122OF) OFF ON 210s t-ltgh temp.
3
t3EOF3-319
F3-14 Wast
l Ins fuel
l In:; InJeci
l In:;
l Vol Injecl
l In:;
Presr
l SCI Engir
l InsI

SUPPLEMENTAL SERVICE INFORMATION .
I
The following points in this section are changed in comparison to the Mazda 323 4-Wheel Drive Work-
shop Manual [I 229-l O-89t].
Turbocharger
l Removal / Installation
Wastegate solenoid valve
l Inspection
htercooter
l Removal I Installation
Fuel pump (main)
l Inspection
Fuel pump resistor/relay
l System operation
l Inspection
Injector
l Inspection
l Volume test
Injector resistor
l Inspection
Pressure regulator control system
l Solenoid valve (pressure regulator control}
Engine control unit (ECU)
l Inspection 13EOF3.320
F3-I 5