1992 MAZDA PROTEGE engine

EGI MT l ENGINE CONTROL SYSTEM(3/3) <>. .DOHC
INSTRUMENT
(SECTION E-3)
EXCEPT
SECTION G) LAMPS
(SECTION 1-4)
-01 ENGINE CONTROL UNIT(EM1
1” is 10 10 iw 1K 11 1G 1E ic 1A 61-19 AIRFLOW METER (EM)
2Y 2w 2” 25 20 20 2M 2K 21 26 2E
2c 2A
X G/W Y/B V L/R * i/o Y G/ x ‘I;’ W /L B/O
L/B * W/B W/Y W/R * W/L Y/B G/O X R/B R/L G/ * “F’ P /0 B/O
1.l 1H IF ID IS
22 2x 2v 2T 2R 2P 2N 2L 2J 2H 2F 20 26
-20 THROTTLE SENSOR 81-21 CLUTCH SWITCH fF)
(EM) El-22 NEUTRAL SWITCH (EM1

<>. .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)

<>. .DOHC
EGI EC-AT iENGINE CONTROL SYSTEM &i EC-AT CONTROL SYSTEMt3/3)
STARTING SYSTEM
(SECTION A-1)
12-01 ENGINE CONTROL UNIT (EM) A-02 INHIBITOR SWITCH
1U IS 10 10 it4 IK 11 1G 1E IC 1A F)
* W G G/B G/R ‘8~)-~/YGh ~113 v L/R x L/5 x G/O *
*
R/W 6/L O/i L/Y L/B B/L R/B W/E W/Y W/R L L/Y Y/0 * * * * *
I” IT IR 1P 1N ii iJ IH 1F 10 13
12-19 AIRFLOW METER (EM) 52-24 SOLENOID VALVE (EC-AT) GINHIEITOR SWITCH (~1
I

OUTLINE F
ENGINE CONTROL UNIT (ATX)
The engine control unit (ECU) is united with the EC-AT control unit for simplification of the system.
PREVIOUS
I
EC-AT CONTROL UNIT
OUTPUT DEVICES
ENGINE CONTROL
I I MALFUNCTION DISPLAY FUNCTION
I
L- ------ -------- ----__ __J
NEW ENGINE/EC-AT CONTROL UNIT
-----------m--e-
I
1
1
4
I I
OUTPUT
*
h
T I
NPUT SIGNALS I )c
I ENGINE CONTROL
‘I
FAIL-SAFE FUNCTION
NPUT SIGNALS I EC-AT CONTROL
I DEVICE!
OUTPUT DEVICE:
23UOFX-01
Signals input to the combined engine/EC-AT control unit are classified into engine and EC-AT control signals within the unit.
The operation of the engine control and EC-AT control are unchanged from the previous model.
F-l 3

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

OUTLINE F
SPECIFICATIONS
Item
Idle speed*1 *2
Ignition timing*2
Fuel pump
Maximum outout Dressure Engine
rpm B6 SOHC
6O--80 BTDC 1
kPa (ka/cm’. osi1 1 BP SOHC
700-800
4O---6O BP DOHC
90-l 1 O
441-637 (4.5-6.5. 64-92) I
I Fuel filter I
Type Low-pressure side Nylon element (in fuel pump)
High-pressure side Paper element
Pressure reaulator
Regulating pressure kPa (kg/cm’, psi) 1 265-314 (2.7-3.2, 38-46)
I lniector I
Type Type of drive
Resistance
Idle speed control (ISC) valve
TvDe , ,
t Resistance
Purge control solenoid valve
Resistance
Water thermosensor n High-ohmic
Electromechanical
12-16
Rotarv
n I II-13 I
n 1 23-27
1 -20% I -4OFj 1 14.6-17.8
Resistance k62 2ooc i 68OF) 2.21-2.69
40°C (104OF) 1.0-l .3
80°C (176OF) 0.29-0.35
Airflow meter
E2++Vs
E2-Vc Fully closed
Fully open 20-600
20-l ,000
200-400
Capacity liters (US gal, Imp gal) 1 Hatchback 50 (13.2, ll.O), PROTEGE ,... 55 (14.5, 12.1)
I Air cleaner I
Element type
Fuel
Specification l
l Wlth parking brake applied (Canada)
‘2 TEN terminal of diagnosis connector grounded Oil permeated
Unleaded regular (RON 91 or higher) 23UOFX-012
F-l 5

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