1992 MAZDA PROTEGE fuel

<>. .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)

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

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

TROUBLESHOOTING GUIDE F
USING THIS SECTION
Introduction
Most of the fuel and emission control system is electrically controlled, often making it difficult to diagnose
problems in the system, especially intermittent problems, Before undertaking actual checks, take a few minutes
to talk with a customer who approaches with a drivability complaint. The customer is often a good source
of information on such problems, especially intermittent ones. Through talks with the customer, one can find
out what the symptoms are and under what conditions they occur.
Work flow
CHECK IN
LISTEN TO CUSTOMER COMPLAINTS
REFER TO TROUBLESHOOTING PAGE THAT - - - - - - - - - - - DIAGNOSTIC INDEX
CORRESPONDS TO ACTUAL SYMPTOM (Refer to page F-23)
CHECK FOR WHAT IS BAD IN SYSTEM - - - - - - - - - - - - - INSPECTION
1
CHECK FOR WHAT PART IS BAD - - - - - - -,- - - - - - - ACTION
i I
REPAIR/REPLACEMENT - - - - - - - - 1
I
DETERMINE IF TROUBLE HAS BEEN ELIMINATED
1 Yes
CHECK OUT
13lJOFX-008
Diagnostic index
No.:
Each troubleshooting item is
assigned a number.
TROUBLESHOOTING ITEM: There are 29 troubleshooting
items. Choose the item that
most closely
corresponds to
the actual symptom.
TROUBLESHOOTING GUIDE
‘ROUBLESHOOTINl3 ITEM
f H
DESCRIPTION
iE
7
-
DESCRIPTION:
Describes each troubleshooting
item.
/
PAGE:
Shows the reference page.
OWOFX-014
F-25

F TROUBLESHOOTING GUIDE
Troubleshooting chart
6 I
CRANKS NORMALLY BUT HARD TO START - WHEN ENGINE COLD
*Engine cranks at normal speed but requires excessive crankmg time before starting
IESCRIP-
l Batterv in normal condition
llON l Restans OK after warmup l Engine runs normally at idle [If Idle condrtron is not OK, refer to “Rough idle” (Nos. S-12)]
TROUBLESHOOTING HINTS]
B Air/Fuel mrxture too rrch @Air/Fuel mixture too lean
l Arrflow meter stickrng l Fuel iniectron control malfunction
l Aw cleaner element clogged
*Idle weed control malfunction (Correction for coolant temperature)
0 Poor atomizatron
- ~~ ~~ *Low RVP (summer) fuel is used rn cold weather >
f INSPECTION T Check If “00” is displayed on Self-Diagnosis
Checker wth Ignition switch ON -
Yes
No CT page F-73
SYSTEM SELECT: 1
“SELECT SW: A
Check if ECU terminal voltages are OK
(Especially 1C. 2D. and 2Q)
cc page F-144
Check If engine starts easily when throttle valve -
Yes
-
NO
-
Yes ACTION
Go to next step
Malfunctlon Code No. dlsplayed
Check for cause (Refer to specified
check sequence)
“58” flashes CT- page F-79
Check ECU terminal 1F voltage
Speciflcetlon: Battery voltage CT page F-144
(Ignition ewltch ON)
+ If OK, replace ECU CT page F-143
e If. not OK, check wrring between
ECU and Self-Diagnoos Checker
Go to next step
Check for cause CI page F-145
(-!hnrlr ,‘ ICP ..-I..- .^ nv
c+ page F-103
13UOFX-009
DESCRIPTION:
Further describes the symptom. Confirm that the chart addresses the actual symptom before beginning
troubleshooting.
TROUBLESHOOTING HINTS:
This describes the possible point of malfunction.
STEP:
This shows the order of troubleshooting. Proceed with troubleshooting as indicated.
INSPECTION:
This describes an inspection to quickly determine the malfunction of parts. If a detailed procedure is necessary
to perform the INSPECTION, refer to the page shown by the “~7” mark.
ACTION:
This recommends the appropriate action to take as a result (Yes/No) of the INSPECTION. How to perform
the action is described on the reference page shown by the “~7” mark.
OWOFX-016
F-26

TROUBLESHOOTING GUIDE
DIAGNOSTIC INDEX
No. TROUBLESHOOTING ITEM DESCRIPTION
1 Will not crank or cranks slowly Refer to Engine Electrical System PAGE
G- 4
Engine cranks at normal speed but shows no sign of 1 F-30
Engine cranks at normal speed but shows only par-
I
tial combustion and will not continue to run
Engine starts normally when cold, but will not start af-
After warm-up
5 Cranks normally but
Always
hard to start Engine cranks at normal speed but requires exces-
sive cranking time before starting F-36
F-38
I----
F-40 Same condition as No.5 when engine cold
Restarts normally after warm-up
Same cond;ion as No.5 after running and hot
soaked
Starts normally when cold
8
H
Rough idle
9 (Low idle speed)/
Engine stalls at idle Enaine stalls or vibrates excessivelv at idle
Engine stalls or vibrates excessively at idle during
warm-up 1 F-42
F-44
Engine runs normally at idle during warm-up but
vibrates excessively or stalls after warm-up
Engine stalls or vibrates excessively at idle when
A/C, P/S, or E/L ON F-46
F-46
starting (acceleration from idle)
l---- Engine stalls or vibrates excessively only just after
Idle speed excessive after warm-up 1 F-50 F-49 12 Rough idle/Engine stalls just after starting
13 High idle speed after warm-up
1 14 1 Idle moves up and down/Idle hunting Engine speeds up and down periodically at idle
1 F-52
I l5 I Engine stalls on deceleration
Engine unexpectedly stops running while decelerat-
ing or after deceleration F-54
Engine intermittently stops running
Flat spot occurs just after accelerator depressed or
mild jerkrng occurs during acceleration
Unexpected change in engine speed which is usually
repetitive F-56
F-57
F-59 16 Engine stalls suddenly (Intermittent)
17 Hesitates/Stumbles on acceleration
1 18 1 Surges while cruising
19
I I
Lack of power Performance poor under load when throttle valve F-61
wide open
Maximum speed reduced
Performance poor-while accelerating
-I- F-65 20 Poor acceleration
21 Runs rough on deceleration/Backfire Engine runs rough while decelerating and abnormal
combustion occurs in exhaust system F-69
Abnormal combustion accompanied by audible
“pinging” noise
Gasoline odor in cabin 22 Knocking
23 Fuel odor
24 Exhaust sulfur smell
26 High oil consumption Exhaust gas smells abnormal
Oil consumption excessive
Fuel economy unsatisfactory 1 26 1 Poor fuel economy 1 F-75
Self-Diagnosis Checker does not indicate malfunction
23UOFX~O’
F-27