1992 MAZDA 323 relay

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

F3 CONTROL SYSTEM
Ve: Battery voltage
Termina
1N ’
10
1P
IQ
IR
IS
1T
tlJ
IV Jnput Outpul
0
0
0
0
0
0
0
0
0 Connected to
Throttle sensor
(idle switch) Test condition
Correct voltage Remark
Accelerator pedal released
Below 1.0V
lgnltlon switch
Accelerator pedal depressed
VI3 ON
Foglrght relay
P/S pressure
switch Fogtight switch ON
Fogfight switch OFF
Ignition switch ON
P/S pressure switch ON at Idle
PIS pressure switch OFF at idle Va
ov
V3
Below 1 .OV
VB -
-
A/C switch A/C switch ON
A/C switch OFF Below 23 Ignition switch
Va ’ ON and blower
motor ON
1 f Ekctrtc cooltng fan Fan operating (coolant temperature over
Below 1 .OV
switch
97OC 1207OF 1 or diagnosis connector
terminal TFA grounded) -
Fan not operating (Idle)
VI3
Blower control Blower control switch OFF or 1st position
.Va
swbtch Ignitton switch
Blower control switch 2nd or hjgher po-
Below 1 .OV ON
sition
Rear window
defroster switch Rear window defroster OFF
Rear window defroster ON Below 1 .OV Ignition switch
V0 ON
Headlight switch
Headfights ON Va
Headlights OFF -
Below 1.OV
Neutral/Clutch
Neutral position or clutch pedal
9eJow I .OV
switches
depressed
Others
Va
7
r u-.
I-I-I
f
2y 2w 2u 2s 20 20 2M 2K 21 2G 2E 2C 2A 1U 1s 10 10 1M 1K 11 rG IE tC ;A
22 2% 2V 2T 2R 2P ZN 2L 25 2H 2F 2D 28 tV 1T ‘IR IF 1N It ;J. IH IF ID 18
i
A
F3-48
-- Alwa@
Always
Always
Always
--
Always
--
Always
--
Always
--
Always
--
Always
(electric
--
Alway<;
--
Always
-e
Afway?;
I .ov
Always
--
Always
--
Alway:;
--

-. _.. . . . . . _ - ._.
-w
CONTROL SYSTEM F3
I .
-.
Ve: Battery voltaae I
Incorrect voltage
Atwafi below 1 .OV
Always VB
Always VS (foglight switch OK)
Always below 1 .OV
Always below 1 .OV
Always Vs
Always
below 23 (blower fan OK)
Always VB (blower fan OK)
Always below 1 .OV
(electric cooling fan OK) -
1-
Possible cause
l Throttle sensor mrsadjustment l Short circuit in wtrrng from throttle sensor to ECU terminal 1 N l ECU malfunction
l Throttle sensor mrsadjustment l Open circuit in wiring from throttle sensor to ECU terminal fN l Open circuit in mnng from throttle sensor to ECU terminal 20
l Foglight relay malfunctron
l Foglrght relay malfunction
l P/S pressure switch maltunctron l Short crrcurt In wrrlng from P/S pressure switch to ECU terminal 1 P l ECU malfunction
l P/S pressure switch malfunction l Open circuit in wlnng from P/S pressure switch to ECU terminal 7 P l Open circuit in wiring from P/S pressure switch to ground
l A/C switch malfunctron l Short circuit tn wiring from A/C switch to ECU terminal 1Q l Poor connection at ECU connector l ECU malfunction
l #C swatch malfunction l Open circuit in wiring from A/C switch to ECU terminal 1Q l Open circuit in wiring from A/C switch to blower control switch
l Open or short circuit in wiring from fan relay to ECU terminal 1R l ECU matfunction
Always below 1 .OV (blower fan OK}
Always Vs (btower fan OK)
Always betow illumination lamp
1 .ov ON when rear
window defroster
switch ON
Illumination lamp
never ON
Atways below 1 .OV (headttghts OK)
l Short circuit in wrrtng from blower control switch to ECU terminal IS l Poor connection at ECU connector l ECU m&function
l Open crrcuit in wrrrng from blower control switch to ECU terminal 1s
l Open or short crrcuit In wiring from rear window defroster switch to ECU
terminal t T
l Open circuit in wiring from ignitron switch to rear window defroster switch l Rear window defroster switch malfunction
l Open or short circuit in wiring from headlight relay to ECU terminal 1 U
Always below 1 .OV
l Neutral switch malfunction l Clutch switch malfunction l Short circuit in wiring from ECU terminal IV to neutral or clutch switch
Always VB
l Neutral switch malfunction l Clutch switch malfunction l Open circuit in wiring from ECU terminal 1V to neutral or clutch swdch l Poor connection at ECU connector
13FOl=3-36 .
F3-49
.:i

F3 CONTROL SYSTEM
Terminal Input Dutpui
2s - 0
2T 0
2U 0
2v 0
2w 0
2x 0
2Y 0
22 0 t
I, Ve: Battery voltage I I I Connected to Test condition
Correct voltage Remark
Overboost warning lgnitron switch ON
VB
-
buzzer
Solenoid valve
(PRC low temp.) 180 sec. after engrne started with coolant Below 1.W No-load engine
temperature is above 9O*C { 194*F ] and condition
intake air temperature IS between 40°C
1104*FJ and 50°C {122OF
f Other condition at idle
I VS
tnjector {Nos. 1, 3) Ignition switch ON VS
Idle V0’
I Engine speed above 2,000 rpm during
I Ve
deceleration (after warm-up)
Injector (Nos 2, 4) Ignition switch
ON VS
Idle VS’ * Engine Signal
Monrtor: Green
and red lamps
flash
ISC valve Engine speed above 2,000 rpm during VS
deceleration (after warm-up)
Ignition switch ON Approx. 7V
-
Idle 1 Approx. 9V
Solenoid valve
(purge control) Ignition switch ON
Idle V0
-
VB
Ci rcuit-opening
relay ignition switch ON
tdle 1 VB
I 8elow l.OV -
Solenotd valve
(PRC high temp.) 210 sec. after engine started wrth coolant Below 1.5V
temperature above 90°C ]194*F] and
Intake atr temperature above 50°C
f t22*F1 No-load engine
cond$on
1 Other condition at idle
I VB
I -
7 I PI
I l-1 t
r
2'f 2W 2U 25 iQ 20 &A 2K 21 2G 2E 2C 2A 1U 1s 10 10 1M 1K 11 tG If 1C 1A
F3-52 --
A/w&
--
Alway
--
Alway
--
Alway
--
Alwaj
--
Alwa f
--
Alwas]
--
Alwa I’

VB: Battery voltage
Incorrect voltage Possible cause
Always OV
l Open or short &curt in wirtng from ECU terminal 25 to buzzer
Always OV or VB
l Refer to Code No.25 Troubleshooting (Refer to page F3-18)
-
Always OV l Main relay (FUEL INJ relay) malfunction l Open or short crrcult rn wlnng from Injector to ECU termtnal 2U or 2V
Always Va
l ECU matfunctlon
Always OV or VB
Always OV or VB
Always OV
Atways OV or VB
l Refer to Code No.34 Troubleshooting
(Refer to 323 Workshop Manual (1203-t O-89F))
l Refer to Code No.26 Troubleshooting
(Refer to 323 Workshop Manual (1203-lO-89F))
l Open or short circuit in wiring from ECU terminal 2Y to relay
l Refer to Code No. 35 Troubleshooting (Refer to page F3-18)
F3-53

-
Reading Wiring Diagrams GI
Symbol
Horn Meaning l Generates sound when current flows. Symbol Switch (1) Meaning l Allows or breaks current flow by
opening and closing circuits.
Speaker
ccl
Heater l Generates heat when current flows. Normally open (NO)
Switch (2)
I
Normally closed (NC)
Harness l Unconnected intersecting harness.
Speed sensor
+ Movement of magnet in speedometer
turns contact within sensor on and off. (Not connected)
w Connected intersecting harness.
Ignition switch
l Turning ignition key switches circuit to
operate various component.
(Connected)
Relay (1)
l Current flowing through coil produces electromagnetic force causing contact to open or close.
No current to coil Current to coil
Uormally open (NO)
Relay (2) Normally open relay (NO)
lormally closed (NC) [/I jr No flow @jj 1 Flow
Normally closed relay (NC)
Sensor (variable) a Resistance changes with other Diode l Known as a semiconductor rectifier,
components operation. the diode allows current flow in one
IA direction only.
R
CaIhode(K)--++- Anode(A)
- Flow 01 electric C”llO”,
KIIZT)-A K-A K-A
#ensor (thermistor) 0 Resistance changes with temperature. Light-emitting diode l A diode that lights when current flows.
V-ED) l Unlike ordinary bulbs, the diode does
not generate heat when it.
%u
I-
- Cathode(K) -$----- Anode(A)
Capacitor
l Component that temporarily stores
electrical charge.
----it----
Flow of current
Solenoid
l Current flowing through coil generates Reference diode l AIIOWS current to flow in one direction
electromagnetic force to operate (Zener diode) up to a certain voltage; allows current
to flow in the other direction once that
ti
n voltage is exceeded.
9

Reading Wiring Diagrams
Loaic symbols I
ypes of logic symbols Operation Expressing output Simple relay circuits
OR
Input to A or 8 will Low electricai potential (L) at A and B +
produce output at C. no output (L) at C
A
6
D- High electrical potential (H) at A or B +
C output (H) at C
AND Input to A and B will High electrical potential (H) at A and B +
produce output at C. output(H) at C
q---J-c
Low electrical potential (L) at A or B + A
no output (L) at C
B a-00-a C
6
INV No input to A will produce Low electrical potential (L) at A -+
an output at B. no ground (H) B
An input to A will not High electrical potential (H) at A +
A- 6 produce an output at B. grounds (L) B A- 6
PROCESS Simplified representation of complex functions within circuit describes
main function. (Examples)
---
--I- 1 1. Igniters
I
-L-l Signal detector for engine control unit, cooling unit, and tachometer.
Ii- 2. r”~“-‘-‘-““‘~~‘.“’
Sbnsl conwflw :
i...-..--.---......-.~~
Signal converter for turn and hazard flasher unit and igniter unit.
Abbreviations used in this booklet
A
AAS
ABS
ACC
ACCEL
ACV
ADD
AE
AIS
ALL
ALT
EP
ANT
EV
EP
ATX
A/C
AIF
AIR
:AC
B/L
CARB
CCT
CIGAR
COMBI
CON
CONT
CPU
CSD
DEF
DOHC
ECPS Ampere
Autoadjusting Suspension
Antilock Brake System
Accessory
Accelerator
Air Control Valve
Additional
Acoustic Equilibration
Air Injection System
Automatic Load Leveling
Alternator
Amplitude Modulation
Amplifier
Antenna
Autostop
Alr Supply Valve
Automatic transmission
Atmospheric Pressure
Automatic Transaxle
Air Conditioner
Air Fuel
Auto Reverse
Battery
Bypass Air Control Valve
Bilevel
$rr$:,tor
Cigarette
Combination
Conditioner
Control
Central Procassino Unit
&Id-Start Device -
Defroster
Double-Overhead Camshaft
Electronically Controlled Power
Steering ECU
EGI
EGR
ELEC
ELR
ETR
EXH
E
FICB
FM
F/S
F/I
GEN
ET
HI
H/D
I;LUMl
INT
ISC
JB
LCD
LF
k!
z Engine Control Unit
Electronic Gasoline Injection
Exhaust Gas Recirculation
Electrio
Emergency Locking Retractor
Electronic Tuner
Exhaust
Front
Fast-Idle Cam Breaker
Frequency Modulation
Feedback
Fuel lniector
Generator
Heater
High-Energy Ignition
High
Heater/Defroster
Ignition
lllumlnation
Idle-Speed Control
Joint Box
Liquid Crystal Display
Left Front
Left Hand
Low
Left Rear
Low Wave
:I, Motor
Middle
MIL
MIN Malfunction Indicator Lamp
Minute
MIX
Mixture
MPX Multiplex
ZR Manual Transmission
MTX Mechanical Tuning Radio
Manual .Transaxie PRG
PTC
P/S ass
kc
FIF
. . .
RH
RPM
!2EL
SQ
ST
SW
TCV
TEMP
TICS
TR
TWS
V
VENT
VOL
VRIS
W Middle Wave
Normally Closed
Normally Open
Overdrive
Switch Off
Switch On
Power
Pressure Regulator Control
Solenoid Valve
Purge Solenoid Valve
Positive Temperature Coefficient
Heater
Power Steering
;im&k-Start System
Recirculation
Right Front
Right Hand
Revolutions Per Minute
Right Rear
Solenoid
Squares Per Milimeter
Start
Switch
Twin Scroll Turbocharger
Solenoid Valve
Temperature
Triple Induction Control System
Transistor
Total Wiring System
Volt
Ventilation
Volume
Variable Resonance Induction
System
Watt(s)
IO