1987 MAZDA 626 fuel pressure

OUTLINE 4A
SPECIFICATIONS
F6 & F8 Engine
Engine F6 F8
Specification General Singapore General
ECE,
Hong Kong, &
Singapore

Idle speed
rpm
MTX 800
+58
Idle speed
rpm
ATX 950
t5§
(in N range)|
900 +5§ (in N
range)
CO concentration
%
2.0
± 0.5
(Without secondary
air
injection)

Carburetor

Type Down draft, two barrel
Throat diameter
mm (in)
Primary 30 (1.18) Throat diameter
mm (in)
Secondary 34 (1.34)
Venturi diameter
mm
(in) Primary 23.5 (0.93) Venturi diameter
mm
(in) Secondary 29.0 (1.14)
Main nozzle
mm (in)
Primary 2.6 (0.10) Main nozzle
mm (in)
Secondary 2.8 (0.11)
Main
jet mm (in)
Primary MTX 1.10 (0.0433) 1.09 (0.0429) 1.14 (0.045)
Main
jet mm (in)
Primary ATX 1.10 (0.0433) 1.08 (0.0425) 1.12 (0.044) Main
jet mm (in)

Secondary 1.50 (0.059)
Main
air
bleed mm (in)
Primary MTX 0.60 (0.024) 0.60 (0.024) 0.55 (0.022) Main
air
bleed mm (in)
Primary ATX 0.60 (0.024) 0.80 (0.031) 0.60 (0.024) Main
air
bleed mm (in) Secondary 0.50 (0.020)
Slow
jet mm (in)
Primary 0.48 (0.019) 0.46 (0.018) Slow
jet mm (in)
Secondary 1.00 (0.039) 1.10 (0.043)
Slow
air
bleed mm (in)
Primary No.1 0.80 (0.031)
Slow
air
bleed mm (in)
Primary No.2 1.90 (0.075) Slow
air
bleed mm (in) Secondary No.1 1.00 (0.039) 0.80 (0.031) Slow
air
bleed mm (in) Secondary No.2 0.50 (0.020)
Power
jet mm (in)
0.50 (0.0201
Fast idle adjustment
mm (in)

Clearance between
Drimarv
throttle valve and bore
1.40-1.76 (0.055—0.069) MTX: 0.48-0.64 (0.019-0.025) ATX: 0.56-0.72 (0.022-0.028)
Float level adjustment mm (in)
Max. fuel flow
"L"

Clearance between
flo

44 (17.3)
at and
air
horn without aasket Float level adjustment mm (in) Fuel stop
"H"
12.5(0.49)
Clearance between float and
air
horn without aasket; float lowered
by
own weight
Choke breaker diaphragm mmHg (inHg)
Start 180-240 (7.1—9.5) 100-160 (3.9—6.3) Choke breaker diaphragm mmHg (inHg) Stop 290-350 (11.4—13.8) 220—280 8.7—11.01
Choke opener mmHg (inHg) Start 35-65 (1.4-2.6)
...
35-65 (1.4-2.6) Choke opener mmHg (inHg) Stop
......
130-190 (5.1-7.5) 130-190 (5.1-7.5)

Fuel tank capacity
Liters (US gal, Imp gal) 60 (15.9, 13.2)

Fuel Dump

Delivery pressure kPa (kg/cm2,
psi)
20-26 (0.20-0.27, 2.8—3.8)
Feeding capacity cc/min (cu in/min) More than 860 (52.5)
at
idle

Fuel filter

Type Paper element with magnet

Air cleaner

Fresh-Hot switching Manual Diaphragm type
Element tvoe Oil permeated paper
Fuel specification Leaded regular

76G04A-513
4 A—15

4A OUTLINE
FE Engine
Engine FE 8Valve FE 12Valve FE 8Valve
Specification General Middle East
ECE, Hong Kong, & Singapore Unleaded fuel

Idle speed
rpm
MTX 800
+5§
850
+5§
Idle speed
rpm
ATX 900
+58 (in N
range)
CO concentration
%
2.0
± 0.5
(Without secondary
air
injection)

Carburetor

Type Down draft,
two
barrel
Throat diameter
mm (in)
Primary 30 (1.18) Throat diameter
mm (in)
Secondary 34 (1.34)
Venturi diameter
mm (in)
Primary 23.5 (0.93) Venturi diameter
mm (in)
Secondary 29.0 (1.14)
Main nozzle
mm (in)
Primary 2.6 (0.10) Main nozzle
mm (in)
Secondary 2.8 (0.11)
Main
jet mm (in)
Primary MTX 1.14 (0.045) 1.09 (0.0429) 1.14 (0.045) 1.09 (0.0429) Main
jet mm (in)
Primary ATX 1.12 (0.044) 1.08 (0.0425) 1.12 (0.044) 1.09 (0.0429) Main
jet mm (in)

Secondary 1.55 (0.061) 1.50 (0.059) 1.55 (0.061) 1.50 (0.059)
Main
air
bleed
mm (in)
Primary MTX 0.50 (0.020) 0.60(0.024) 0.50 (0.020) 0.50 (0.020) Main
air
bleed
mm (in)
Primary ATX 0.55 (0.022) 0.80 (0.031) 0.55 (0.022) 0.50 (0.020) Main
air
bleed
mm (in) Secondary 0.50 (0.020)
Slow
jet mm (in)

Primary 0.46 (0.018)
Slow
jet mm (in)
Secondary MTX 1.10 (0.043) 1.00 (0.039) 1.10 (0.043) 0.90 (0.035) Slow
jet mm (in)
Secondary ATX 1.10 (0.043) 1.00 (0.039) 1.10 (0.043) 1.00 (0.039)
Slow
air
bleed
mm (in)
Primary No.1 0.80 (0.031)
Slow
air
bleed
mm (in)
Primary No.2 1.90 (0.075) Slow
air
bleed
mm (in) Secondary No.1 0.80 (0.031) 1.00 (0.039) 0.80 (0.031) 1.00 (0.039)
Slow
air
bleed
mm (in) Secondary No.2 0.50 (0.020)
Power
jet mm (in)
MTX 0.50 (0.020) 0.50 (0.020) Power
jet mm (in)
ATX 0.50 (0.020) 0.40 (0.016)
Fast idle adjustment
mm (in)
Clearance between primary throttle valve and bore
MTX 0.48—0.64
(0.019-0.025) 1.40—1.76
(0.055-0.069)
0.48—0.64
(0.019-0.025) 1.40-1.76
(0.055-0.069)
Fast idle adjustment
mm (in)
Clearance between primary throttle valve and bore ATX 0.56-0.72 (0.022—0.028)
1.40—1.76
(0.055-0.069) 0.56-0.72 (0.022—0.028)
1.40-1.76
(0.055-0.069)
Float level adjust-
ment
mm (in)

Max. fuel flow
"L"

Clearance between
flo

44 (17.3)
at and
air
horn without aasket Float level adjust-
ment
mm (in)
Fuel stop
"H" |
12.5(0.49)
Clearance between float and
air
horn without aasket: float lowered
bv
own weiaht
Choke breaker diaphragm mm-Hg (in-Hg)
Start 100-160 (3.9—6.3) 180—240 (7.1-9.4) 100-160
(3.9-6.3)
180-240
(7.1-9.4) Choke breaker diaphragm mm-Hg (in-Hg) Stop 220—280
(8.7-11.0)
290-350
(11.4-13.8)
220—280
(8.7-11.0)
290-350
(11.4-13.8)
Choke opener mmHg (inHg)
Start 80—120
(3.1-8.7)
30-70 (1.2-2.8) Choke opener mmHg (inHg)
Stop 220-280 (8.7—11.0) 130-190
(5.1-7.5)

Fuel tank capacity
Liters (US aal, Imp aal) 60 (15.9, 13.2)

Fuel DumD

Delivery pressure kPa (kg/cm2,
psi)
20-26 (0.20—0.27, 2.8-3.8) 20-29 (0.20-0.30, 2.8-4.3)
20-26 (0.20-0.27, 2.8-3.8)
Feedina caDacitv cc/min
feu
in/mini More than 860 (52.5)
at
idle

Fuel filter

Type Paper element with magnet

Air cleaner

Fresh-Hot switchina Diaphragm Manual Diaphragm Bimetal
Element
tvDe
Oil permeated paper
Fuel specification Leaded super
Unleaded super Leaded regular Leaded super Unleaded super Unleaded regular

76G04G-514
4A—16

FUEL SYSTEM 4 A
76G04A-048
76G04A-049
FUEL PUMP
Inspection
Fuel pressure
1. Disconnect the hose at the carburetor and connect
a fuel pressure gauge.
2. Disconnect the fuel return hose from the fuel pump
and plug the fuel pump return pipe as shown in
the figure,
3. Measure the pressure while the engine is idling.
Replace the pump, if necessary.
FE & F8 (ECE,
Hong Kong,
Singapore)
Others
Pressure kPa
(kg/cm2, psi)
20—29 (0.2-0.3, 2.8-4.3)
20-26
(0.20-0.27,
2.8-3.8)
Flow rate (volume)
1. Disconnect the carburetor fuel hose and insert the
end into a measuring breaker.
2. Disconnect the fuel return hose from the fuel pump
and plug the fuel pump return pipe as shown in
the figure.
3. Start the engine and measure the amount of fuel
pumped per minute.
Volume: More than 860 cc (52.5 cuin)/min
Removal
1. Remove in the following order.
(1) Fuel outlet hose
(2) Fuel inlet hose
(3) Fuel return hose
(4) Fuel pump
(5) Gasket
(6) Insulator
(7) Gasket
76G04A-050
Installation
Install in the reverse order of removal.
Caution
a) Replace the gasket whenever the fuel pump
is replaced.
b) Be sure to connect the hoses in the correct
positions.
Check for leaks.
76G04A-051
4A—35
expert22 fl/i* http://rutracker.org

IDLE-UP CONTROL SYSTEM 4 A
FE (Middle East) and F6 (General)
Possible cause
jrvo

diaphragm

3
jrvo

diaphragm

n c o> (0
E 3 3 O
® >
a >
•o o c e
£ O **
S M O
£ O
'i (0 (0
O <
o a
o E W 0)
lm Q.
c a k 4) -
9-5
"S "5 (O > CO < a. DC H Js * OC M
Page 4A—72 4A—74 4A—74 Section 15 4A—75 Section 16
Checking order 1 2 3 4 5 6 7 8
76G04A-136
FE 8Valve—Unleaded Fuel
Posible cause

Engine

control

unit

terminal

Servo

diaphragm

Vacuum

signal

Solenoid

valve £ O **
S CO O
£ U
S <0 U) Relay
(for
A/C) ** n ** w o E «
Refrigerant
pressure

switch
H D I Servo

diaphragm

Vacuum

signal

Solenoid

valve
< a. Relay
(for
A/C)
H Refrigerant
pressure

switch

Page 4A—91 4A—72 4A—74 4A—74 Section 15 4A—75 Section 16
Checking order 9 1 2 3 4 5 6 7 8
76G04A-137
4A—71

FUEL AND EMISSION
CONTROL SYSTEMS
(FUEL INJECTION FE)
OUTLINE 4B— 2
SYSTEM DIAGRAM 4B— 2
COMPONENT LOCATION 4B— 3
VACUUM HOSE ROUTING
DIAGRAM 4B— 5
SPECIFICATIONS 4B— 6
TROUBLESHOOTING GUIDE 4B— 7
TROUBLESHOOTING
PROCEDURE 4B— 7
TROUBLESHOOTING WITH SST.... 4B— 9
INSPECTION PROCEDURE 4B—10
AFTER-REPAIR PROCEDURE 4B—10
PRINCIPLE OF CODE CYCLE 4B—12
CODE NUMBER 4B—13
SWITCH MONITOR FUNCTION 4B—25
INSPECTION PROCEDURE 4B—26
IDLE SPEED 4B—29
IDLE MIXTURE 4B—29
INTAKE AIR SYSTEM 4B—30
COMPONENT DESCRIPTIONS 4B—30
REMOVAL 4B—31
PARTS INSPECTION 4B—32
INSTALLATION 4B—34
IDLE-UP SYSTEM 4B—35
COMPONENT DESCRIPTIONS 4B—36
TROUBLESHOOTING 4B—37
AIR VALVE 4B—38
AIR BYPASS SOLENOID VALVE ... 4B—39
FUEL SYSTEM 4B—42
COMPONENT DESCRIPTIONS 4B—43
TROUBLESHOOTING 4B—44
FUEL PRESSURE RELEASE AND
SERVICING FUEL SYSTEM 4B—45
MULTI-PRESSURE TESTER 4B—46
FUEL PRESSURE 4B—48
FUEL PUMP 4B—49
PULSATION DAMPER 4B—50
INJECTOR 4B—51
PRESSURE REGULATOR
CONTROL SYSTEM 4B—53
COMPONENT DESCRIPTIONS 4B—54
TROUBLESHOOTING 4B—55
REPLACEMENT 4B—57
FUEL TANK 4B—61
DECELERATION CONTROL
SYSTEM 4B—64
COMPONENT DESCRIPTIONS 4B—65
TROUBLESHOOTING 4B—66
AIR INJECTION SYSTEM 4B—68
COMPONENT DESCRIPTIONS 4B—68
TROUBLESHOOTING 4B—69
EXHAUST GAS RECIRCULATION
(EGR) SYSTEM 4B—71
COMPONENT DESCRIPTIONS 4B—71
TROUBLESHOOTING 4B—72
EVAPORATIVE EMISSION
CONTROL (EEC) SYSTEM 4B—74
COMPONENT DESCRIPTIONS 4B—74
TROUBLESHOOTING 4B—75
POSITIVE CRANKCASE
VENTILATION (PCV) SYSTEM 4B—80
COMPONENT DESCRIPTION 4B—80
EXHAUST SYSTEM 4B—81
REMOVAL AND INSTALLATION ... 4B—82
INSPECTION 4B—82
CONTROL SYSTEM 4B—83
RELATIONSHIP CHART 4B—84
EGI MAIN FUSE 4B—86
MAIN RELAY 4B—86
CIRCUIT OPENING RELAY 4B—86
ENGINE CONTROL UNIT 4B—87
NEUTRAL SWITCH 4B—91
CLUTCH SWITCH 4B—91
BRAKE LIGHT SWITCH 4B—91
P/S PRESSURE SWITCH 4B—92
INHIBITOR SWITCH 4B—92
E/L CONTROL UNIT 4B—93
AIR FLOW METER 4B—94
THROTTLE SENSOR 4B—95
WATER THERMO SENSOR 4B—97
WATER THERMO SWITCH 4B—97
OXYGEN SENSOR 4B—98
ATMOSPHERIC PRESSUFfE
SENSOR 4B—99
76G04B-001

4B OUTLINE
SPECIFICATIONS
Item Specification

Idle speed rpm MTX: 800 +5„° (Neutral), ATX: 900 +5S
(P
range)

Throttle body

Type Horizontal draft (1 -barrel)
Throat diameter mm (in) 50 (2.0)

Air flow meter

E2-VS More than
20

E2-VC 100-300
Resistor
Q
E2-VB 200—400 Resistor
Q

E2-THA -20°C
(
—4°F) 13,600-18,400 20°C
(
68°F) 2,210-2,690 60°C (140°F)
493- 667
Air cleaner

Element type Oil permeated

Fuel pump

Type Impeller
(in
tank)
Output pressure kPa (kg/cm2,
psi)
441-588 (4.5-6.0, 64—85)
Feeding capacity cc (cu in)/10 sec. 220 (13.4) minmum

Fuel filter

Type Low pressure side Nylon element Type High pressure side Paper element

Pressure regulator

Type Diaphragm
Regulating pressure kPa (kg/cm2,
psi)
235-275 (2.4—2.8, 34—40)

Injector
TvDe
Hiqh-ohmic
Type
of
drive Voltage
Resistance
fi
12-16
Injection amount cc (cu
in) 15
seconds 38—53 (2.3-3.2)

Fuel tank

Capacity liters (US gal, Imp gal) 60 (15.9, 13.2)

Fuel

Soecification Unleaded reaular

76G04B-506
4B—6

4B TROUBLESHOOTING GUIDE
The Troubleshooting Guide lists the systems most likely
to
cause
a
given symptom. After finding
sys-

tems
to
check, refer
to
the
pages shown
for
detailed guides
for
each system.

Possible
cause

Fuel
and
Emission Control Systems

Possible
cause
Intake
Air
System
(Poor
connection
of
components,
throttle
body)

Fuel

System
(Fuel

injection,

Fuel
pressure)
Pressure
Regulator
Control
System
Idle-up
System

(Air

valve,
solenoid
valve
malfunction)

EGR

System

(EGR

control
valve
stuck
and
open)

EEC

system
(Vacuum
switch
valve,
No.1
purge
control
valve
malfunction)
PCV

System
(System

clogged)

Deceleration

System
(Dashpot,
fuel
cut
operation
malfunction)

Air

injection

system
(Reed
valve
malfunction)
Exhaust
system

(System

clogged)

Page 4B—30 4B—42 4B—53 4B—35 4B—71 4B—74 4B—80 4B—64 4B—68 4B—81

Symptom

2
2 1

Symptom

3

4 3 1 2

Symptom

3
5 4 2 3 1

Symptom

4
6 5 1 4 2 3

Symptom

4
7 6 2 4 5 1 3

Symptom

5
3 1 2

Symptom
6
3 4 1 2 5
Symptom

7
3 2 1

Symptom

8
3 4 1 2

Symptom

9
2 3 1 4

Symptom

10
2 1

Symptom

11
7 8 5 2 6 3 4 1

76G04B-004
The numbers
of
the list show the priorities
of
inspections from the most possible to that with
the
lowest
possibility.
These were determined
on the
following basis:
• Ease
of
inspection
•
Most possible system
•
Most possible point
in
system
4B—8

INTAKE AIR SYSTEM 4B
REMOVAL
Caution
Before removing the following parts, release the fuel pressure from fuel system to reduce
the possibility of injury or fire. (Refer to page 4B—45.)
Remove in the sequence shown in the figure.
1. Air flow meter connector
and secondary air hose
2. Air cleaner
3. Air duct
4. Resonance chamber
5. Air flow meter
6. Air hose
7. Vacuum hoses, air hoses,
and water hoses
8. Accelerator cable
9. Throttle sensor connector
10. Throttle body
11. EGR modulator valve
12. Air hose
13. Air bypass solenoid valve
76G04B-038
14. Intake manifold bracket
15. Dynamic chamber bracket
16. Fuel return pipe
17. Dynamic chamber
18. Injector connector
19. Delivery pipe assembly
20. Air valve
21. Intake manifold and gaskets
4B—31