1992 MAZDA PROTEGE relay

EGI MT n ENGINE CONTROL SYSTEM (i/3) CD.. OOHC 0 . ..CANAOA 3-l
MAIN
lOA @
HERMOSWITCW
SECTION B-3)
l-01 ENGINE CONTROL UNIT (EM)
iU 1s
IQ IO it4 1K 11 16 IE 1C ,A 61-02 MAIN RELAY (~1 2Y 2W 2U 25 28 20 2M 2K 21 26 2E 2C 24 81-03 CIRCUIT OPENING
(FUEL INJ)
R/0 O/L G/B G * -G/Y )c G/W Y/B
pL/W R
l -G/ x “y W 3/LG 0/O

<>. .DOHC EGI EC-AT l ENGINE CONTROL SYSTEM 6, EC-AT CONTROL SYSTEM(1/3)
(SECTION n-i)
DIAGNOSIS CONNECTOR
(SECTION U)
SHIELD WIRE
TACHOMETER
2-01 ENGINE CONTROL UNIT(EM) 82-02 MAIN RELAY (E)
,IJ 23 113 10 1” 1K 11 1G 1E 1C 1A _
20 2M 2K 21 26 2E 2C 2A 3~ 3W 3” 35 30 30 3M 3K 31 36 3E 3C 3A (FUEL INJ)
* w G G/B G/A (‘c) G/ G/W Y/B V L/R
W/L W/L R/E G/ W/B L/W R/L W 0 L/O Y * L/O X G/O X kBc Y/W Y /L E/O

EGI EC-AT eENGINE CONTROL SYSTEM &i EC-AT CONTROL SYSTEM(2/3)
DISTRI8UTOR -W/R IEM) ::
MAIN RELAY [FUEL INJI
(SECTION B-2d
I-4)
F-2)
@
t-01 ENGINE CONTROL UNIT (EM) 82-09 DISTRIBUTOR (EM)
X L/O x G/O
!-17 INJECTOR N0,4(INJ) 82-18 WATER THERMOS:NSyFB2-25 SOLENOID VALVE
(vIcs) (INJ)

F OUTLINE
A comparison of the new and previous models is as follows.
Engine Control Unit Terminal Relation Ship Chart
Connected to
Headlight switch Terminal
Connected to Terminal
New Previous New Previou
1H IU
Water thermosensor 2E 2Q
Diagnosis connector
(TEN terminal) / II 1 IK 1 1 Throttle sensor
Rear window defroster switch
I I 21 2K
Ground (California)
Main relay (Canada)
A/C relay
Vehicle speed sensor
P/S pressure switch
A/C switch
Blower control switch 1K 2H
IL 1J
1M --
1N 1P
10 IQ
1P 1s Distributor
(G-signal) [DOHC]
Intake air thermosensor
Solenoid valve
(Purge control)
Ground (Injector)
Ground (Output)
Ground (CPU) 2J 2G
2K 2P
20 2x
___
Stoplight switch 1Q 10
Ground (Input)
1 I I 1 ! 3D ! 2D
Cruise control main switch
1 lS / - II8cRalnardega,y
Throttle sensor
(Idle switch)
Distributor
(Ne-signal) 1T 1N
2A 2E
2B 20
2C 2N Solenoid valve
(VICS)
--.-- I_-
Solenoid valve
(Pressure regulator) [BP] 31 2s
-- -_
3M 2T
Airflow meter
Oxygen sensor
-
Fan switch 1 2D 1 IR 1 1 lniector (Nos. 2, 4) I 3v I 2v
23UOFX-01 I
F-l 4

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

F TROUBLESHOOTING GUIDE
Output Devices and Engine Conditions
Note
. The data in this chart is for reference only.
INJECTOR
CONDITIONS
CRANKING
-COLD ENGINE
l COLD AIR l COLD COOLANT
COLD START
-FAST IDLE
l COLD AIR l COLD COOLANT
COLD DRIVEAWAY
-PART THROTTLE
l COLD AIR l COLD COOLANT
WARM DRIVEAWAY
-PART THROTTLE
. WARM AIR
l WARM COOLANT
HOT CRUISE
l WARM AIR l WARM COOLANT Zero
One
mrnute
Two
minutes
Three
minutes
I AIR
INJECTION “AL”E
INJECTION TlMlNG
A
All A
cylinders
each
ignition
pulse
1
Rich Open:
coolant
tem-
perature:
Below
40%
(104OF)
,
I/
Rich and
2-group” 1’
lean l-group” /I
,
i
HOT ACCELERATION
-60% THROTTLE
-lOT ACCELERATION
-WIDE OPEN
THROTTLE
Closed ISC
VALVE
1, THREE-WAY
SOLENOID SOLENOID
VALVE VALVE
(PURGE
(PRESSURE
CONTROL) REGULATOR
CONTROL)‘3
c
OFF
(Purge
cut)
Large
1
, AK
RELAY
amount or
bypass air
OFF
(Vacuum
to
pressure
regulator)
After start-
rng: ON dur-
ing hot start
only (Vacu-
um cut)
OFF
l 2 SOHC, *’ BP
F-22

F TROUBLESHOOTING GUIDE
SYMPTOM TROUBLESHOOTING
2 CRANKS NORMALLY BUT WILL NOT START (NO COMBUSTION)
l Engine cranks at normal speed but shows no sign of “firing”
DESCRIP-
*Battery in normal condition
TION
*Throttle valve not held fully open while cranking (Dechoke system not operate)
*Fuel in tank [TROUBLESHOOTING HINTS]
Because of no combustion, possibly no fuel is injected to engine or no ignition at all cylinders
:I) No spark
@I Low fuel line pressure
l Ignition control malfunction
@ Low engine compression l Ignition system component malfunction
3 No fuel injection
l Fuel pump inoperative l Injectors inoperative
TEP INSPECTION
ACTION
1 Check if strong blue spark is visible at discon-
Yes Go to Step 3
netted high-tension lead
No Go to Step 2
2 Check if “00” is displayed on Self-Diagnosis
Yes Check ignition system (Refer to
Checker with ignition switch ON
Troubleshooting “Misfire”) w page G-5
w page F-82
No Service Code No. displayed
Check for cause (Refer to specified
check sequence) w page F-83
“88” flashes
Check ECU terminal 1F voltage w page F-150
Specification: Battery voltage
(Ignition switch ON)
W: SELF TEST e If OK, replace ECU w page F-149 c3 If not OK, check wiring between
SELECT SW: A ECU and Self-Diagnosis Checker
3 Connect diagnosis connector terminals F/P and
Yes Check if engine starts in this condition
GND with jumper wire and check for fuel pump
operating sound with ignition switch ON c3 If starts, check circuit opening relay c7 page F-129
w page F-125
c3 If does not start, go to Step 5
DIAGNOSIS C
Go to next step ._-,
._. ,
F-30