1989 MAZDA 323 Relay position

F OUTLINE
COMPONENT DESCRIPTIONS
Component
Air cleaner
Airflow meter
Mr valve
Atmospheric pressure
Sensor
Catalytic converter Function Remark
Filters air entering throttle body
Detects amount of intake air; sends signal to intake air thermosensor and fuel pump
ECU switch included
Supplies bypass air into dynamic chamber
l Engine speed increased to shorten
when engine is cold warm-up period
l Thermowax type l Installed in dynamic chamber
Detects atmospheric pressure; sends signal Built in ECU
to ECU
Reduces HC, CO, and NOx by chemical Monolith type
reaction Charcoal canister
Stores fuel tank fumes while engine stopped Check valve
Controls pressure in fuel tank Two-way type Circuit opening relay
Voltage for fuel pump while engine running Clutch switch (MTX)
Detects clutch condition; sends signal to Switch OFF when clutch pedal released
ECU Diagnosis connector
Concentrated service connector 25pin (located near left suspension mount-
Concentrated terminals: ing block)
1. EGI self-diagnostic terminal
2. EC-AT self-diagnostic terminal
3. Test terminal
4. Fuel pump check terminal
5. Cooling fan check terminal
6. Engine rpm output terminal Dynamic chamber
Interconnects all cylinders Engine control unit (ECU) Detects the following:
1. A/C operation 1. A/C switch
2. Air/fuel ratio (Oxygen concentration) 2. Oxygen sensor
3. ATF thermosensor
4. Atmospheric pressure 4. Atmospheric pressure sensor
5. Braking signal 5. Stoplight switch (MTX)
6. Cranking signal 6. Ignition switch (START Position)
7. DRL (Daytime Running Light) operation 7. DRL relay (Canada)
8. E/L operation 8. Blower motor switch, cooling fan relay,
headlight switch, and rear window
defroster switch
9. Engine coolant temperature 9. Water thermosensor
10. Engine speed 10. Distributor (Ne-signal)
11. Ignition ON signal 11. Ignition switch
12. In-gear condition 12. Neutral and clutch switches (MTX)
13. Inhibitor switch (ATX) 13. N range, D range, S range, L range
switch
14. Intake air amount 14. Airflow meter
15. Intake air temperature 15. Intake air thermosensor
(In airflow meter)
16. No.1 piston TDC of compression
17. P/S operation
18. Shift solenoid (ATX)
19. Test signal (Ignition timing, idle speed,
Malfunction code No.)
20. Throttle valve fully closed/fully open
condition 16. Distributor (G-signal) DOHC)
17. P/S pressure switch
18. 1-2, 2-3, 3-4, Lockup solenoid
19. Diagnosis connector
(TEN terminal)
20. Throttle sensor (MTX)
21. Throttle valve opening angle
22. Turbine sensor 21. Throttle sensor (ATX) .__r
F-10

OUTLINE
Component Function Remark
Engine control unit (ECU) Controls operation of the following:
(Cont’d)
1. A/C (Cut-off) 1. A/C relay
2. Fail-safe function 2. Self-Diagnosis Checker and MIL
3. Fuel injection system 3. Injector
4. idle speed control 4. Idle speed control (ISC) valve
5. Ignition timing control system 5. Igniter
6. Monitor function 6. Monitor lamp (Self-Diagnosis Checker)
7. Pressure regulator control system 7. Solenoid valve
(Pressure regulator control) (BP)
8. Purge control system 8. Purge control solenoid valve
9. VICS 9. Solenoid valve (WCS) (DOHC) Fuel filter
Filters particles from fuel Fuel pump
Provides fuel to injectors l Operates while engine running l Installed in fuel tank Igniter
Receives spark signal from ECU and gener-
ates high voltage in ignition coil Ignition switch
Engine cranking signal sent to ECU (START position)
Inhibitor switch (ATX)
Detects in-gear condition; sends signal to Switch ON in N or P range
ECU Injector
Intake air thermosensor
Idle speed control (ISC)
valve
Main relay
(FUEL INJ relay)
MIL (Malfunction
indicator lamp)
Neutral switch (MTX)
Oxygen sensor
PCV valve
P/S pressure switch
Pressure regulator
Resonance chamber
Resonance duct
Separator
Stoplight switch
Solenoid valve
(Purge control)
Shutter valve actuator
(DOHC)
Throttle body
Throttle sensor
Injects fuel into intake port l Controlled by signals from ECU
l High-ohmic injector
Detects intake air temperature; sends signal Installed on dynamic chamber
to ECU
Controls bypass air amount Controlled by duty signal from ECU
Supplies electric current to injectors, ECU,
etc.
Lamp flashes to indicate malfunction code
number of input and output devices
Detects in-gear condition; sends signal to
ECU
Detects oxygen concentration; sends signal
to ECU
Controls blowby gas introduced into engine
Detects P/S operation; sends signal to ECU
Adjusts fuel pressure supplied to injectors
Reduces intake air noise
Reduces intake air noise
Prevents fuel from flowing into charcoal
canister
Detects braking operation (deceleration),
sends signal to ECU
Controls evaporative fumes from canister to
intake manifold
Closes/opens shutter valve to improve
torque characteristics
Controls intake air quantity
l Detects throttle valve fully closed/fully
opened condition (MTX) TEN terminal grounded
Switch ON in neutral
Zirconia ceramic and platinum coating
P/S: ON when steering wheel turned right or
left
Controlled by duty signal from ECU
For Variable inertia charging system (VICS*)
Integrated throttle sensor, dashpot, and ISC
valve
l Detects throttle valve opening angle
(A-W
l Sends signals to ECU
F-l 7

SELF-DIAGNOSIS FUNCTION F
PREPARATION
SST
49 6019 9AO
System Selector For
diagnosis 49 HO18 9Al
Self-Diagnosis
Checker For
diagnosis
SERVICE CODE NUMBER
Inspection Procedure
1. Connect the SST to the diagnosis connector.
2. Set switch @to position 1.
3. Set TEST SW to SELF-TEST position.
23UOFX-048
03UOFX.059
I
4. Connect the SST to the System Selector and a ground
5. Set the select switch to position A.
6. Turn the ignition switch to ON.
7. Verify that 88 flashes on the digital display and the buzzer
sounds for 3 sec. after turning the ignition switch ON.
8. If 88 does not flash, check the main relay (FUEL INJ relay)
(Refer to page F-172) power supply circuit, and diagno-
sis connector wiring.
9. If 88 flashes and the buzzer sounds continuously for more
than 20 sec., check for a short circuit between the engine
control unit terminal 1 F and the diagnosis connector. Re-
place the engine control unit if necessary and perform Steps
3 and 7 again.
23UOFX-049 IO. Note any code numbers and check for the causes by refer-
ring to the check sequences shown on pages F-88
through F-103. Repair as necessary.
Note
l Cancel the code numbers by performing the after-
repair procedure following repairs.
(Refer to page F-104.)
I 23UOFX-050
F--83

CONTROL SYSTEM
VB: Battery voltage
erminal Input Output
Connection to Test condition Correct voltage
Remark
1L
0 A/C relay Ignition switch ON VB
A/C switch ON at idle Below 2.5V
A/C switch OFF at idle V0
-
1M 0
1N 0 Vehicle speed
sensor
P/S pressure
switch While driving 4--5v
Vehicle stopped 0 or 8V
Ignition switch ON
VB
P/S ON at idle
ov
P/S OFF at idle Vi3 -
-
10 0 A/C switch A/C switch ON
A/C switch OFF Below 2.5V ignition switch
VB ON and blower
motor ON
IP 0 Blower control
switch Blower control switch OFF or 1st position Ve ignition switch
Blower control switch 2nd or higher po- Below 1 .OV ON
sition
1Q 0
1R 0
1s 0
IT 0 Stoplight switch Brake pedal released Below 1 .OV
-
Brake pedal depressed VI3
Inhibitor switch N or P range ov Ignition switch
(P, N ranges) ON
Other range VI3
Cruise control main Normal condition
VB Ignition switch
switch ON
Set or Resume switch ON or vehicle speed Below 1 .OV
8 km/h (5 mph) lower than preset speed
(Driving vehicle cruise control operation)
Throttle sensor Accelerator pedal released Below 1 .OV Ignition switch
(Idle switch)
Accelerator pedal depressed V0 ON
1u - - -
- - -
1v - - - -
- -
2A 0 Distributor Ignition switch ON Approx. OV
(Ne-signal) or 5V -
Idle Approx. 2V
LY”“l I. A3 311 blFY.1.
J
- .*
F-160

WINDSHIELD WIPER AND WASHER
Wiper does not operate in Lo or Hi position
(With wiper relay)’
I
Check WIPER 20A fuse
Repair harness and replace fuse
VB: Battery voltage
OK
Turn ignition switch ON
Check for battery voltage at terminal-wires (L) of wiper
relay connector NG
- Repair harness (Fuse box-Wiper relay)
I OK
Check for battery voltage at terminal-wires (W) and
(G/W) of above connector
I Replace wiper relay (Refer to Section T)
OK
Disconnect wiper switch connector;
check for battery voltage at terminal-wires (W) and
W’J) Repair harness (Wiper relay -Wiper switch)
I OK
Check for continuity of above connector terminal-wire
(B) to ground
I
Repair harness (Wiper switch-Ground) 1
1 OK
Check wiper switch (Refer to
I Replace combination switch (Refer to Section T)
1 OK
Check for battery voltage at terminal-wires (L/W) and (R)
of wiper relay connector with switch as shown NG
Replace wiper relay (Refer to Section T)
l Lo : (L/W) Ve l Hi : (R) Ve
OK
1 I
Disconnect wiper motor connector; check for battery
voltage at terminal-wires (L/W) and (R) with switch as
shown
l !-0 : (L/w) VB l Hi : (R) VB NG
= Repair harness (Wiper relay-Wiper motor)
OK
Check continuity between wiper motor body and
ground NG
= Repair ground circuit of wiper motor body
Check wiper motor (Refer to page S-70)
*: U.S. with/without cruise control, Canada with cruise control
23UOSX-017
Wiper does not operate in Lo or Hi position
(Without wiper relay)’
Check WIPER 20A fuse
OK
Repair harness and replace fuse .-
S-68 Cont’d

S SLIDING SUNROOF
I c a
I
jh f db jht; a
23UOSX-035
a
a ACE
ftE-3
b ii ItI i:
(FRONT VIEW)
03uosx-14
Limit switch
Using the sunroof emergency handle (hex-head wrench) set
the roof panel in the positions shown, and check for continui-
ty between terminals of the motor assembly connector.
O----O: Indicates continuity
SUNROOF RELAY
Inspection
1. Disconnect the sunroof relay connector.
2. Check for continuity between terminals.
O---O: Indicates continuity
3. Check for continuity between terminals (c) and (i) when bat-
tery voltage is connected to terminal (f) and a ground is con-
nected to terminal (j).
SUNROOF SWITCH (OVERHEAD CONSOLE)
Inspection
1. Disconnect the sunroof switch connector.
2. Check for continuity between terminals.
m: Indicates continuity

I
EXTERIOR LIGHTING SYSTEM
Headlights do not operate (Low and/or High)
(Without cruise)
I
Turn ON light switch (second position)
I
Check head 30A main fuse Short circuit
0
Confirm battery voltage on R w Repair harness (Main fuse - Combination switch) L
I
0 OK
Confirm battery voltage on R wire (when Low) and/or
R/W wire (when High) of the combination switch Replace the combination switch
Confirm battery voltage on R wire (when Low) and/or
R/W wire (when High) of the headlight Repair harness (Combination switch - Headlight)
I
0
Confirm continuity on B wire of the headlight
Repair harness (Headlight - Body ground)
Burnt out bulb
23UOTX-017 Headlights do not operate (Low and/or High)
I
(With cruise)
I
Turn ON light switch (second position)
Short circuit
0 OK
Confirm battery voltage on W/R wire of the combination switch
I
8) C OK Repair harness (Main fuse - Headlight relay)
I
Replace the headlight relay
1
Repair harness (Headlight relay - Combination switch)
Confirm battery voltage on R wire (when Low) and/or
R/W wire (when High) of combination switch connector Replace the combination switch
1
Q 1 OK
Disconnect headlight connector. Confirm battery voltage
on R wire (when Low) and/or on RIW wire (when High)
of connector
,o OK
Repair harness (Combination switch - Headlight)
1
I
Confirm continuity on B wire of the headlight connector
to ground Repair harness (Headlight - Body ground)
I
T-32
OK _ Replace the bulbs
23UOTX-018

EXTERIOR LIGHTING SYSTEM T
Headlights either do not operate or are dim Low-High beam or passing flasher does not
J operate
Burnt out bulb or poor grounding J
03UOTX-049 Defective combination switch
03UOTX-050
(Canada) Daytime running lights (DRL) do not operate
Confirm that headlights operate with the light switch ON
(second position) OK
Turn OFF the light switch and turn ON the ignition
switch when parking level pulling
I
Check head 30A main fuse OK
Check DRL resistor OK Repair DRL resistor 10A fuse
Confirm battery voltage on R and L/G wire of the DRL NG
relay Repair harness (Fuse - DRL relay)
I
I
Check the DRL relay
Repair DRL relay
1 OK
Confirm battery voltage on (BRNV) wire of the DRL con-
trol unit NG
Repair harness (DRL relay - DRL control unit) OK
Confirm battery voltage on (L/G) wire of the DRL control NG
unit Repair harness (Rear wiper fuse - DRL control unit) OK
Confirm continuity of (G/R) wire of the DRL control unit x Repair harness (DRL control unit - Parking brake
to ground switch) or check the parking brake switch 1 OK
Confirm continuity on (B) wire of the DRL control unit to
NG
ground Repair harness (DRL control unit ground) OK
-1 NG
Confirm approx. 8V on the DRL resistor Repair harness (DRL control unit - DRL headlight)
I
Confirm battery voltage on (
Confirm approx. 8V on (R/W) wire of the DRL resistor Repair harness (DRL resistor - DRL relay)
Repair harness (DRL control unit - DRL resistor)
23UOTX-019
T-33