1992 MAZDA 323 fuel pump

F3 FUEL SYSTEM
t 3EoF3-344
1
FUEL SYSTEM
FUEL PUMP
inspection
Fuel pump operation
1. Connect the diagnosis connector F/P and GND terminals
by using a jumper wire.
2. Remove the fuel filler cap.
3. Turn ON the ignition switch.
4.
Listen at the filler inlet for the operational sou.nd of the fuel
pump.
5. Install the fuel filler cap.
6. If no sound is heard, measure the voltage between the fuel
pump connector (G/R) to a ground.
Voltage: 8attey vo kage
7. If not as specified, check the circuit opening relay and circuit.
8. ff as specified, check fur continuity between fuel pump con-
nector (G/R) and (B).
9. If there is continuity, reptace the fuel pump.
10. If there is no continuity, repair the ground circuit.
f3EOF3.345
13EOF3-346 FUEL PUMP RESlSTORlRELAY
System Operation
1. Remove the rear seat cushion.
2. Measure the voltage at the fuel pump connector terminal
A (G/R).
Voltage
I
Cranking
1 Battery voltage
Ignition switch ON ov 3. If not as specified, perform the following inspections, and
repair or replace as necessary.
l Fuel pump resistor/relay resistance
(Refer to page F3-41.)
l ECU 11 terminal voltage (Refer to page F3-45.)
l Wiring harness and connector
F3-40
ii e -
*
_~ --
C --
A-'

-,
-,
--
--
-1
E
7
2
I
i 3EAR SE
--

FUEL SYSTEM F3
13EOF3.34
c I 13EOF3-364 FUEL PUMP CONNECTOR
/
!NSTALL CLAMPS
I
l nspection
1, Disconnect the resistor/relay connector.
2. Ground the fuel pump resistor relay terminal D.
3. Apply battery voltage and check for continuity as shown.
Terminal C
Continuity between A and I3
Battery voltage applied NO
ov Yes
4. Measure the resistance between terminals E and F.
Resistance : 0.38--0.42Q (at 2O*C {6S°F 1)
PRESSURE REGULATOR
Inspection
Fuel line pressure
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F3-21.)
1. Disconnect the negative battery terminal.
2. Connect a fuel pressure gauge between the fuel filter and
the fuel main hose. (install clamps as shown.) , .
I
3. Connect the negative battery terminal.
/t.
4, Start the engine and run it at idle.
5. Measure the fuel line pressure.
Fuel line pressure:
206-255 kPa [ 2.1-2.6 kgflcml, 30-37 psi )
6. Disconnect the upper vacuum hose from the pressure regu-
lator and measure the fuel line pressure.
Fuel line pressure:
304-392 kPa (3.1-4.0 kgf/cm2, 44-57 psi )
F3-41

F3 CONTROL SYSTEM
Terminal voltage
Reference date
Vs: Battery voltage
‘em&al Input Output Connected to Test condition Correct voltage Remark
1A - - Battery Constant VB
For backup
18 0 Main relay
Ignition switch OFF ov
(FUEL INJ relay) -
ON
V8
1C 0 lgnitlon switch While cranking Approx. 1 OV
(START) -
Ignition switch ON ov
10 0 Self-Diagnosis Test switch at SELF TEST
Wtth Self-
Checker Lamp illuminated for 3 sec. after ignition Approx. 5V
(monitor lamp) switch OFFdON Diagnosis Check-
er and System
lamp not iltuminated after 3 sec. V8 Selector
Test switch at 02 MONITOR with engine
idling Approx. 5V
Monitor lamp illuminated
Test switch at 02 MONITOR with engine
idling Vi3
Monitor lamp not illuminated
IE - - - - - -
IF
0 Self-Diagnosis Buzzer sounded for 3 sec. after ignition
Below 2SV
l With Seif-
Checker switch OFF-+ON
Diagnosis
(service code)
Buzzer not sounded after 3 set V0 ’ Checker and
Buzzer sounded Below 2.5V System Selector
l With System
Buzzer not sounded VB Selector test
switch at SELF
TEST
1G 0 igniter tgnition switch ON
ov
-
Idte
Approx. 0.2V
It-l 0
Solenoid valve Ignition switch ON
VB
(wastegate)
Idle
Approx. 2V ’ -
II
0 Fuel pump While cranking
Approx. 1 OV
resistor/relay -
Idle
8etow 1.5V
IJ 0 NC relay Ignition switch ON
VB
A/C switch UN at idle
Below 2.5V
. NC switch OFF at idle V3
-
IK 0 Diagnosis
connector
(TEN terminal) System Selector test switch at
02 MONITOR
System Selector test switch at
SELF TEST V0
-
8elow l*OV
1L - - - - - -
I
1M - - - - -
I -
lr ‘- l-7
f L.-
r
20 20 2M 2K 21 2G 2E 2c 2A IU 1S 10 10 ltvl tK II Ir; tE 1~ IA
1
22 2x 2v 2T ZR 2P 2N 2L 25 2H 2F 20 2B 1V IT 1R tP 1N IL 1J 1H IF 1~ 1~
1
J=3-46 --
4lways 4
--
AIways 4
--
Atways 1
--
Always 1
-a
Always ’
--
Always i
-e
Always I
2.5v
Always
Always (
-m
Always f
-a
Always 1
Always (
--
Always I
2.5V
Always 1
Always t
Always
--

,,1
CONTROL SYSTEM F3 ‘1
Va: Battew voltage
Incorrect voltage Possible cause
Always OV
l ROOM IOA fuse burned l Open circuit In wiring from ROOM 10A fuse to ECU termina! 1A
Always OV
l Main relay malfunction l Open or short circuit in wiring from main relay to ECU terminal IB
Always OV (starter turns)
l Open or short circuit in wiring from ignition switch to ECU terminal IC
Always OV
Always VB
l Maln relay (FUEL INJ relay) malfunction l Open circuit in wiring from main relay to diagnosis connector terminal +B l Open or short circuit in wiring from diagnosis connector terminal MEN to
ECU terminal 1 D
l Poor connection at ECU connector l ECU malfunction
Always approx. 5V . ECU malfunction
Always below
2.5v
Always Ve -
-
No display on Self- * Main relay (FUEL INJ relay) malfunction
Diagnosis Checker
l Open circuit in wiring from main relay to diagnosis connector terminal + B
“88” displayed and
l Open or short clrcurt in wiring from diagnosis connector terminal FEN to
buzzer sounds con- ECU terminal tF
ti nuousl y
l Poor connection at ECU connector l ECU malfunction
Always QV
l Short circuit in wiring from igniter to ECU terminal 16
Always OV or VB
l Refer to Code No.42 Troubleshooting
(Refer to 323 4-Wheel Drtve Workshop Manual (12?9-IO-89L))
Always VB
Always OV
Always below
2.5V
Atways Ve I ’
l Fuel pump resistor/relay malfunction
l Open or short circurt in wiring from ECU terminal II to fuel pump resis-
tor/relay
A/C does not operate
l A/C reiay malfunction l Open circuit in wiring from ignition switch to A/C relay l Open circuit in wiring from A/C relay to ECU terminal 1J
A/C switch
OFF but l Short circuit in wiring from AIC relay to ECU terminal 1 J
A/C operates . ECU malfunction
l Poor connection at ECU connector l ECU malfunction
Always below 1 .OV a Short circuit in wiring from diagnosis connector terminal TEN to ECU termi-
nal 1K
Always Vs
l Open circuit In wiring from diagnosis connector terminal TEN to ECU terml-
nal IK
-
-
l Open circuit in winrig from diagnosis connector terminal GND to ground’
-
I -
.
. .
-. F3-47

TO TECHNICAL DATA
FUEL AND EMISSION CONTROL SYSTEMS
Item.
Idle speed
tgf-don trrmng-
Fuel pump
MaxImum output pressure
Transfer pump
Maximum output pressure
Fuel filter Engine
rPm
BTDC
kPa [ kgf/cm2, psi 1 1
kPa { kgflcm2, PSI ) 1 BP OUHC turbo
800 f 50
10 l 10
490-736 (5.0-7.5, 71-1 IO]
39 10.4, 5.7 ) or higher
I Type
Low-pressure side Nylon element (in fuel pump)
Hiah-Dressure side PaDer element
Pressure regulator
Regulating low kPa ( kgflcm2, psr 1 265-314 (2.7-3.2, 38-46 1
pressure High kPa { kgflcm2, psr 1 304-392 (3.1-4.0, 44-57 1
lniector
_ Type Low-ohmic
Type of drive
Electromechanical
Resistance q
Approx. 2.11 Q (at 20% ( 68*f )]
lniector reslstor
L - Resistance/injector
Idle-speed control (tSC) valve
TvDe n 1 6 [at 20°C 168OFjj
I Rotarv
Resistance
Solenoid valve (purge control)
Resbstance
Solenoid valve {wastegate)
Resistance n(
R I
i-l I 1 t-13 [at ZO*C {68OF j]
23-27 tat 20°C l68OFll
. r.
33-39 lat 20°C I68OF 11
Solenoid valve (PRC)
Resistance Low temp. q
33-39 [at 2O*C {SS*F]]
High temp. 0 1 33-39 [at 20°C (68OF]]
Water thermosensor
-20°C ( -4OFJ 1 14.6-17.8
Resistance kQ 2o”c I 68OF) 2.21-2.69
40°C ( tO4OF) 1.0-l 3
80°C I176OFJ 0.29-0.35
Airflow meter
Resistance R E244Vs
E2*Vc Fuity closed
Fully open I 20-600
20- 1,000
200-400
EP++THAA
(intake air
thermosensor) -2O*C ( -4OFj 1 13,600-l 8,400
20% 1 68OF) 1 2,210-2,690
6O*C 114OOFl i 493-667
EI ~Fc
I Fully closed 00
0 1
Oxygen sensor (ceramic beater coil)
Resistance
Fuel tank Approx. 6 [at 20°C f68OF)]
I CaDacW L I US oal. ImD aal I I 60 I 15.9, 13.2 I
I
Air cleaner
Element type
Fuel
Specrficatioir Oil permeated
Unteaded premium (RON 95 or higher)
l TEN terminal of diagnosis connector grounded. .
-
ENGINE ELI
3attery
I
Dark current’
Alternator
Starter
Distributor qr
Ignition timin?
ffEN terminal
Ignition coil
Spark plug
l ’ Dark current
r2 Standard pl

I-la1 = ENGINE CONTROL SYSTEM (l/3)
MAIN W/R (F) 0 ocrg\
m BOA JEJJS ROOM “27
rnn L’H(F-=-l ^T.^..^^-^
GNITION
I w
I I C (Fl
JB-04
I W/Y LG/Y W/B
0 (EM) (EM) (EM) (EM)
IA ID 1K lF
(SECTION n-1)
ENGINE CONTROL UNIT
7:: 81-03
IA
64) L .L (EM)
I I
I ’ W/R (EM)
B/W (RI
(EM1
I I B/R EM)
ThiCT”, l.lCIlT
II”.J / ““l~lL,Y I Ii
CLUSTER
(SECTEN cl -G/R +z::
t I I - ,- I
CONTROL SYSTEM
(SECTION B-lb)
I FUEL
B PUMP
(R)
I PUMP RELAY
~-_-, _-.. -, l-01 ENGINE CONTROL UNITtEM)
1” IS 10 10 1M 1K II IG 1E IC i&
R/B O/L G/B G * Xi/ L G/W x V L/R
BR/Y B/L B/G L/Y R/W * L/B O/B W/B W/y W/R
IV lT ,R !P fN IL 1J fH 1F 10 113
L-04 FUEL PUMP(R)
181-05 IGNITER (EM) 2H 2F 2D 28
91-06 CONDENSER (EM)
181-07 IGNITION COIL (EM)
I 8
I
-27 TRANSFER PUMP (Rl 161-28 FUEL PUMP RELAY (EM)
I
Y/L L/Y
B XL I i1-02 MAIN RELAY(E)
81-03 CIRCUIT OPENING
(FUEL INJ) RELAY (EM)
28

MAIN FUSE
Bl-26 FUEL PUMP
UNIT
JB-02 JOINT BOX
JBT
B: -04 FUEL PUMP
HAFINESS SYMSOL : z (I=) m (It) a (I) m (R) +++ (OH) E (IN) *f’ WI)= (EM) ?fi!! (IW)
I
B
i
ENGINE coNTRoL

PARTS INDEX
PARTS NAME PAGE
PARTS NAME PAGE
I KNOCK CONTROL UNIT...................30
KNOCK SENSOR.........................30 .82
.82
.82
.82
.82
.32
.26
.72
a LICENSE PLATE LIGHT...............48.5 0
B MAIN RELAY(FUEL INJ)
............... ..2 8
1 NEUTRAL SWITCH.......................3 2
$3 OIL PRESSURE SWITCH..................3 8
OXYGEN SENSOR........................2 8
J PANEL LIGHT CONTROL..................7 0
PARKING BRAKE SWITCH.................3 8
POSITION LIGHT....................44,5 0
POWER DDOR LOCK SWITCH...............7 6
POWER DDOR LOCK TIMER UNIT...........7 6
POWER DOOR LOCK ACTUATOR.............7 6
POWER OUTSIDE MIRROR MOTOR...........7 0
POWER OUTSIDE MIRROR SWITCH..........7 8
POWER STEERING PRESSURE SWITCH.......3 2
POWER WINDOW MAIN SWITCH.............7 4
POWER WINDOW MOTOR...................7 4
e
1 BACK-UP LIGHT SWITCH.................60
BACK-UP LIGHT....
BLOWER MOTOR.....:::::::::::::::::::’
.E
BLOWER SWITCH........................62
BRAKE FLUID SWITCH...................38
POWER WINDOW SWITCH..................74
J D REAR FOG LIGHT RELAY.
REAR FOG LIGHT SWITCH
REAR FOG LIGHT.......
REAR SPEAKER......... ................
................ zz
................
52
................
................ E
................ 42
............... .
..: 2
.Riik+‘::::::::..6 4
SWITCH.........6 4
................
................ :z
................ 62
............. 44, 48
I CIGARETTE LIGHTER..
CIRCUIT OPENING REL
CLUTCH SWITCH...
COMBINATION SWITCH:
CONDENSER.......
COOLING FAN MOTOR::
COOLING FAN RELAY..
COURTESY LAMP.....,
CPU................ . .64
/ii’::::::::::::::..2 8
..................
... 44, 46, 48, 50, 52, %
..................
.................. 2:
..................
.................. 2:
............... 42, 66
B DIAGNOSIS CONNECTOR.....
DIGITAL CLOCK...........
n-rnnc ............
............ E
............
............ %
............
............ ZE
TURN LIGHT....
WASHER MOTOR.. REAR
REAR
REAR
REAR
REAR
REAR
REAR
REAR
-ih .ER
-ER
RESISTOR ASSEMBLY..
RUNNING LIGHT RELAY
il SEAT WARMER...........
SEAT WARMER REALY.....
SEAT WARMER SWITCH....
SHORT CONNECTOR.......
SLIDING SUNROOF MOTOR.
SLIDING SUNROOF RELAY.
SLIDING SUNROOF SWITCH
SLIDING SUNROOF.......
SOLENOID RESISTOR.....
SOLENOID VALVES
PRC HIGH TEMP........
PRC LOW TEMP.........
PURGE CONTROL........
WASTEGATE............
SPEED SENSOR..........
SPOT LAMP.............
STARTER...............
STOPLIGHT CHECKER..... ........
........
........
........
........
........
........
........
........ ....... 84
.......
....... ::
.......
.... 66.2
.......
.... 66, Ei
.......
....... ........
........
........
........
........
........
........
........
........
........
.
. . . . . . z:
. . .
. . . . zoo
. 1 .
. . . . E
. . . .
56, ::
. . 56, 58
. . 56, 58
“J.“LJL................. DISTRIBUTOR ............
DOOR SPEAKER ........... .
DOOR SWITCH........: .... 8
3 ENGINE CONTROL UNIT............ ,28, 30. 32
3 FLASHER UNIT...
FRONT FOG LIGHT
FRONT FOG LIGHT
FRONT FOG LIGHT
FRONT SIDE TURN
FRONT TURN LIGH
FUEL METER.....
FUEL PUMP REALY
FUEL PUMP UNIT.
FUEL PUMP......
-. -- ............
............ 22 .
. . RiiA‘i 1
SWITCH
i&ii 1 ............ 52
............ .
............ 22
.....................
..................... %
.....................
..................... %
..................... 28 -
tust ....................
B
G SENSOR ................
13 HAZARD SWITCH............
HEADLIGHT CLEANER MOTOR..
HEADLIGHT CLEANER SWITCH.
HEADLIGHT LEVELING ACTUAT
HEADLIGHT LEVELING SWITCH
HEADLIGHT RELAY..........
ENI- IGHT. . . . . .
HORN RELAY...............
HORN SWITCH.............. ...
40, 46, 52, 64
: ........... 82
............ 54
........... .
..: ii
&::::::::..4 6
HORN..................I 1
HYDRAULIC UNIT ..........
01 IC REGURATOR ............
IG KEY CYLINDER LAMP ....
IGNITER .................
IGNITION COIL ...........
ILLUMINATION LAMP .......
AUDIO SYSTEM ...........
BLOWER SWITCH .......... ............
46
............ 44
......... 44, 46
............
............ E
............
............ E
...........
........... 2:
...........
........... 2
...........
........... 5:
...........
........... 5:
...........
........... 5::
...........
........... 5:
..........
.%
;ci:::::::.;;
........... CIGARETTE LIGHTER: ;.I:;::
FRONT FOG LIGHT SWITCH...
HAZARD SWITCH...........
HEADLIGHT CLEANER SWITCH:
HEADLIGHT LEVELING SWITCH
INSTRUMENT CLUSTER.......
REAR FOG LIGHT SWITCH....
REAR WINDOW DEFROSTER SW1
SEAT WARMER SWITCH.......
INDICATOR LAMP...........
...........
........... 33:: ...........
30 STOPLIGHT SWITCH ......
STOPLIGHT .............
0 TAChOMETER...........................3 8
TAILLIGHT.........................48,5 0
TEMP METER...........................3 8
THROTTLE SENSOR......................3 2
TRANSFER PUMP........................2 8
TRUNK COMPARTMENT LAMP SWITCH........6 8
TRUNK COMPARTMENT LAMP...............6 8
TURN SWITCH..........................5 4
q WARNING LAMP.........................3 8
WASHER LEVEL SENSOR..................3 8
WATER THERMOSENSOR................30,3 8
WATER THERMOSWITCH................... 6
WINDSHIELD WASHER MOTOR..............4 0
WINDSHIELD WASHER SWITCH.............4 0
WINDSHIELD WIPER MOTOR...............4 0
WINDSHIELD WIPER SWITCH..............4 0 INJECTOR..........:;.:::::
INJECTOR RESISTOR .........
INSTRUMENT CLUSTER .....
INTERIOR LAMP..........:::
ISC VALVE .................
. . . . . , . . . . .
. . . . . . . . . . . iz:
,..........
30