1992 MAZDA PROTEGE fuel

FUEL SYSTEM F
STA
OBUOFX- 15
03UOFX-15
DISCONNECT CONNECTOR
TO RELEASE FUfL PRESSURE
REAR SEAT C
23UOFX-11
INSTALL CLAMPS
CIRCUIT OPENING RELAY
Inspection
Voltage inspection
I, Check voltage between the following terminals and a ground
using a voltmeter.
Ve: Battery voltage
Resistance inspection
1, Check resistance between the terminals using an ohmmeter.
Terminal Resistance (Q)
STA-El 21-43
B-Fc 109-226
B-Fp 00
Replacement
1, Remove the passenger side wall.
2. Disconnect the relay connector.
3. Remove the relay from ECU bracket.
4. Install in the reverse order of removal.
PRESSURE REGULATOR
Inspection
Fuel line pressure
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-121.)
1, Disconnect the negative battery terminal.
2. Connect a fuel pressure gauge between the fuel filter and
the fuel main hose. (Install clamps as shown.)
3. Connect the negative battery terminal.
4. Start the engine and run it at idle.
5. Measure the fuel line pressure.
Fuel line pressure:
206-255 kPa (2.1-2.6 kg/cm2, 30-37 psi)
6. Disconnect the vacuum hose from the pressure regulator
and measure the fuel line pressure.
Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm2, 36-46 psi)
F-l 29
03UOFX-157

F FUELSYSTEM
DISCONNECT CONNECTOR
TO RELEASE FlJ$L PRESSURE
REAR SEAT C
23UOFX-11
INSTALL CLAMPS 7
03UOFX.I 59
F-l 30
DIAGNOSl&OJNECTOR
/ K
1 SUOFX-10
DISCONNECT CONNECTOR
TO RELEASE
FlJl$L PRESSURE
23UOFX-11
I
Hold pressure
Perform this inspection if the fuel pressure hold inspection is
not as specified. (Refer to page F-121 .)
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-121 .) ,-
1. Disconnect the negative battery terminal.
2. Connect a fuel pressure gauge between the fuel filter and
the fuel main hose. (Install clamps as shown.)
3. Connect the negative battery terminal.
4. Connect the diagnosis connector terminals
F/P and GND
with a jumper wire.
5. Turn the ignition switch ON
for 10 seconds to operate the
fuel pump.
6. Turn the ignition switch OFF and disconnect the jumper wire.
7. Pinch the fuel return hose with pliers.
8. Observe the fuel pressure
for 5 minutes.
Fuel pressure:
More than 147 kPa (1.5 kg/cm2, 21 psi)
9. If not as specified, replace the pressure regulator.
Replacement
Warning
l Before performing the followlng operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or flre. (Refer to page F-l 21.)
l When replacing fuel system components, keep
sparks, cigarettes, and open flames away from the
fuel.
1. Disconnect the vacuum hose.
2. Disconnect the fuel return hose.
3. Remove the pressure regulator.
Tightening torque:
7.8-11 N#m (80-110 cm-kg, 89-95 In-lb)
4. Install a new O-ring.
5. Install in the reverse order of removal.

231JOFX-1
FUEL SYSTEM F
INJECTOR
Inspection
Operation check
1. Warm up the engine and run it at idle.
2. Listen for operational sound of each injector with a screw-
driver or a sound scope.
3. If no sound is heard, measure injector resistance.
4. If the injector resistance is OK, check wiring to the injector
and the voltages of the ECU terminals MTX (2A, 2U and
2V) ATX (3A, 3U and 3V).
(Refer to page F-152.)
Injector resistance
1. Disconnect the injector harness.
2. Measure resistance of the injector with an ohmmeter.
Resistance: 12-l 6Q
3. If not as specified, replace the injector.
03UOFX-1
DISCONNECT CONNECTOR
TO RELEASE FU5L PRESSUR
REAR SEAT C
23UOFX-1
OBUOFX-
GRQMMET
INSULATOR
c5
OSUOFX-
Removal
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-121 .)
l When removing the fuel system components, keep
sparks, cigarettes, and open flames away from the
fuel.
1. Disconnect the connectors from the injectors.
2. Remove the injector harness from the delivery pipe.
3. Remove the bolts from the intake manifold.
4. Remove the delivery pipe with the injectors and the pres-
sure regulator.
5. Remove the injectors, grommets, and insulators.
F-131

l Be extremely careful when working with fuel. I
23UOFX.121 Always work away from sparks or open flames.
3. Connect the diagnosis connector terminals F/P and GND
with a jumper wire.
FUEL SYSTEM
Fuel leakage test
1. Remove the injectors with the delivery pipe.
(Refer to page F-l 31.)
2. Affix the injectors to the delivery pipe with wire.
Caution
l Affix the injectors firmly to the delivery pipe so that
no movement of the injectors is possible.
-
Warning
4. Turn the ignition switch ON.
03UOFX-16’
23UOFX-12 9 5. Tilt the injectors approx. 60 degrees and verify that no fuel
leaks from the injector nozzles.
6. If fuel leaks from an injector, replace it.
Note
l After 1 minute a small amount of fuel leakage from
the injector Is acceptable.
7. Turn the ignition switch OFF and remove the jumper wire.
-i
F-l 32

FUEL SYSTEM I-
9MUOF2-17
INJEC
GRO
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‘$pID~~ :i
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,.,i. :)I,
./[::/: :
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/jj,.‘, ;.::,::
.’ .::: ij!/ji..
OSUOFX-17
T MANIFOLD DELIVERY’ PIPE
MUOFX-17
Installation
Install in the reverse order of removal, referring to Installa-
tion Note.
Tightening torque:
Delivery pipe
19-25 N.m (1.9-2.6 m-kg, 14-19 ft-lb)
Installation note
1. Use new injector O-rings.
2. Apply a small amount of clean engine oil to the O-rings be-
fore installing.
3. Install new injector insulators.
4. Install the injectors.
F-l 33

F PRESSURE REGULATOR CONTROL SYSTEM
PRESSURE REGULATOR CONTROL SYSTEM (BP ENGINE)
THERMOSEN
SOLENOID VALVE
(PRESSURE REGULATOR CONTROL)
(FROM DELIVERY
FUEL
(TO FUEL TANK)
Engine
BP SOHC
BP DOHC Coolant temperature
Above 90% (194*F) Operating condition
Intake air temperature
Above 50°C (122OF)
Above 58OC (136OF) Engine condition . Operating time (set)
Throttle valve fully closed
Approx. 120
or no load condition
Approx. 60
#.nr IAt-%/ 4 7
To prevent percolation of the fuel during hot restart idle, vacuum to the pressure regulator is momentarily
cut, and the fuel injection pressure is increased to slightly more than 284 kPa (2.9 kg/cm2, 41.2 psi).
F-l 34

EVAPORATIVE EMISSION CONTROL SYSTEM F
-l CHECK-AND-CUT VALVE
Inspection
1. Remove the check-and-cut valve.
2. Connect a pressure gauge to the passage connected to
the fuel tank.
3. Blow through the valve from port A and verify that the valve
opens at 6.36-6.34
kPa (0.065-0.065 kg/cm2,
0.92-l 2.09 psi).
4. Remove the pressure gauge and connect it to the passage
to atmosphere.
5. Blow through the valve from port B and verifyjhat the valve
opens at
0.96-4.91 kPa (0.01-0.05 kg/cmL, 0.14-0.71
psi). 1 9MUOF2-194
Note
l The test must be performed with the valve held
horizontally. Otherwise, the ball in the valve will
move out of position and close the passage.
CHARCOAL CANISTER
Inspection
1. Visually check for damage and replace the charcoal canis-
ter if necessary.
F-141

FUEL CUT CONTROL SYSTEM F
FUEL CUT CONTROL SYSTEM
DESCRIPTION
This system is used to improve the fuel economy, to prevent engine bucking during deceleration, and to
protect the engine from overspeeding.
23UOFX-127
PREPARATION
SST
r
49 9200 162
03UOFX.191
l7=---T II USE CPNNECTOR A
03UOFX-19
SYSTEM OPERATION
1. Connect a tachometer to the diagnosis connector IG-
terminal.
2. Connect the
SSTs (Engine Signal Monitor and Adapt-
er)
to the engine control unit (ECU).
3. Warm-up the engine to normal operating temperature and
run it at idle.
Warning
l Confirm that transmission is in Neutral (MTX) or P
range (ATX).
4.
Set the SST (Sheet) on the Engine Signal Monitor with
the specified side fancing up as shown.
Note
l MTX...48 PIN
l ATX...64 PIN
I 23UOFX-128
F-l 43