1990 MAZDA 232 Workshop Manual Suplement

F2 FUELSYSTEM
Note
l Drain the fuei from the fuel tank before removing the tank.
1. Fuel pump cover
2. FueI pump connector
3. Fuel hoses
Installation Note ..___........_.....__......_...._. below
4. Exhaust pipe
Removal / installation . . . . . . . .__._. . , . . . FZ-57, 58
5. Propeller shaft
Removal ! Installation .._._...._....._.._.. Section L 6. Fuel filier hose, breather hose, and
evaporation hoses
tnstal!ation Note ..m..,* . . . . ...*-. *..,- . . . . m...-e.. below
7. Fuel tank straps
8. Fuel tank
Inspect for cracks and corrosion
93GOF2-772
0 FUEL FILLER HOSE
03UOFX- 13! installation Nate
1. Push the ends of the main fuel hose, fuel return hose, and
evaporative hoses onto the fuel tank fittings at least 25mm
(1 .O in).
2. Push the fuel filler hose onto the fuel tank pipe and filler pipe
at least 35mm (1.4 in).
TRANSFER PUMP CONTROL SYSTEM
System Operation
I. Turn the ignition switch ON and verify that the fuel gauge
indicates more than half and that the transfer pump oper-
ating sound is heard.
Warning
l If the fuel level is less than one half, this inspec-
tion cannot be performed.
2. Ground the transfer pump connector terminai-wire (Y/L) with
a jumper wire and verify that the transfer pump stops.
3. Remove the jumper wire and verify that the transfer pump
begins operation after approx. IO sec.
4. If not as specified, check the following parts.
l Fuel pump control unit. [BP turboJ
(Refer to page F2-53.)
4x4 control unit [BP SOHC] (Refer to page Fl-12.)
l Transfer pump. (Refer to page F2-54.)
. Transfer pump switch. (Refer to page F2-54.)
93GOF2-774
F2-52

FUELSYSTEM F2
FUEL PUMP CONTROL UNIT
I I 93GOF2-775
1
93GOF2-799
I 93GOF2-800
I 93GOF2.776
FUEL PUMP CONTROL UNIT [BP TURBO] l
Refer to page Fl-12 for BP SOHC model.
hspection
1. Remove the fuel pump control unit.
2.
Disconnect the fuet pump controt unit connector.
3. Check ctintinuity between the fuel pump control unit con-
nector terminal B (Y/L) and a ground.
4. Perform the following inspection according to the results of
the continuity check.
Continuity exists
1. Turn the ignition switch ON.
2. Ground the fuel pump control unit terminal B (Y/L) with a
jumper wire and verify that the voltage at the fuel pump con-
trol unit terminal D (in’) is OV.
3. Remove the jumper wire and verify that the voltage at the
fuel pump control unit terminal D (L/Y) is approx. WV af-
ter approx. IO sec.
No continuity exists
1. Turn the ignition switch ON
and verify that the voltage at
the fuel pump control unit terminal D (L/Y) is OV.
2. Disconnect the transfer pump connector.
3. Turn the ignition switch ON and verify that the voltage at
the fuel pump control unit terminat D (LA’) is approx. t2V.
Replacement
1. Move the driver’s seat backward.
2.
Remove the bolts and remove the fuel pump control unit
and bracket as an assembly.
3. Remove the fuel pump control
unit from the bracket.
4. Install in the reverse
order of removal.
F2--53

F2 FUELSYSTEM -.
03UOFX-82: 93GOF2-777
2
r
TRANSFER PUMP SWlTCH
Removal I Installation
1. Refer to replacement of the transfer pump.
(Refer to below.)
Inspection
1. Check continuity between transfer pump connector termi-
nal C and ground terminal.
r Float Dosition I Comnuity
I
I Down I Yes
I
2. If not as specified, reptace the transfer pump switch.
TRANSFER PUMP
Inspection
1. Remove the rear seat cushion.
03UOFX-823 2. Disconnect the transfer pump connector.
3. Check for continuity between transfer pump connector
terminal-wires (ES) and (t/V).
4. If no continuity exists, replace the transfer pump.
03UOFX-825
F2-54
Replacement
Warning
l When servicing the fuel system, keep sparks,
cigarettes, and open flames away from the fuel.
1. Remove the rear seat cushion.

FUEL SYSTEM F2
2. Remove the service hole cover of the transfer pump.
3. Disconnect the transfer pump connectors.
4. Disconnect the fuel hose,
5.
Remove the transfer pump.
6. Install in the reverse order of removal. Caution
l Install a new seat rubber.
03UOFX-826
Disassembly I Assembly
Caution
l Prevent contaminants from entering the transfer pump.
1. Disassemble in the order shown in ,the figure.
2. Assemble in the reverse order of disassembly.
3. Verify that the transfer pump operates correctly after assembling it.
HOSE, REPLACE
@
1. Fuel filter
2. Rubber mount
3. Transfer pump 4. Fuel hose
5. Transter pump switch assembly
93GOF2-77:
FZ-55

F2 FUEL SYSTEM
93GOF2-775
1 93GOF2-78(
93GOF2-78:
1
93GOF2-78;
-
93GOF2-783
FUEL PUMP RESISTOR/RELAY
System Operation
I. Remove the rear seat cushion.
2,
Measure the voltage at the fuel pump connector terminal
A {G/O).
Voltage
r Crankinq Approx. 12V
I
I- Others t ACKXOX. I OV i
3. If not within specification, perform the following inspection,
and repair or replace if necessary.
l Fuel pump resistor/relay resistance. (Refer to below.)
l ECU II terminal voltage. (Refer to page F2-60.)
l Wiring harness and connector.
inspection
1.. Disconnect the connector.
2. Ground the fuel pump resister relay terminal D.
3. Apply 12V to terminal C and check for continuity between
terminals A and B.
Terminal C
12 applied
ov Continutty between A and B
NO
Yes
4. Measure the resistance between terminals E and F.
Resistance : 0.62-0.66Q [at 20% (68OF)l
INJECTOR
Volume Test
1. Remove the injectors with the delivery pipe.
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
l Be extremely careful when working with fuel.
Always work away from sparks or open flames.
3. Connect the SST to the battery and injector.
4. Check the injection volume with a graduated container.
Injection volume:
BP SUHC....44-47 cc (2.68-2.87 cu in)/15 sec.
BP Turbo
. ...87-105 cc (5.31 -6.41 cu in)/15 sec.
Caution
l When using the SST, make sure of the SST num-
ber and use correct one.
5. If nut correct, replace the injector(s).

EXHAUST SYSTEM F2
EXl-iAUSTSYSTEM
COMPONENTS
Removal ! inspection / Installation
I. Remove in the order shown in the figure.
2. Inspect alI park and repair or replace as necessary.
3. Install in
the reverse order of removal.
BP SOHC
KET, REPLACE
7.8-l-i Nm
7.8-11 N-m
{8B-110 cm-kg,
69-95 in-lb)
40-55 (4.1-5.6, 3041)
N-m (m-kg, Mb)
93GOF2-784
1. Main silencer
Inspect for deterioration and restriction
2. Middle pipe assembly
Inspect fur deterioration and restriction
3. Pre-silencer
Inspect for deterioration and restriction 4. Catalytic converter
Inspect for deterioration
and restriction
5. Front pipe assembly
Inspect for deterioration and restriction
6. Exhaust manifold insutator
7. Exhaust manifold
Inspect for deterioration and restriction
F2-57

F2 EXHAUST SYSTEM
BP DOHC TURBO
38-46 (X94.7, 28-34)
I
‘ GASKET, REPLACE
40-55 (\s.‘I--5.6, 30-W)
N-m (m-kg, R-B
93GOFZ71
1 , Main silencer
Inspect for deterioration and restriction
2. Middle pipe assembly
Inspect for deterioration and restriction
3 _ P re-silencer
Inspect for deterioration and restriction
4. Catalytic converter
Inspect fur deterioration and restriction
5. Front pipe assembly
Inspect for deterioration and restriction
6. Oxygen sensur
Inspection . . . . _. . . . . . . . . _ . . . . _. . . . . . _ . . _. . page F2-68
Replac.ement . . . . . . . . . . . . . ..*.--*.-....... page F2-68
7. Exhaust manifold and turbocharger
Removal / Installation . . . . . . . . . . . . . . . . page f2-47
ET’--58

CONTROL SYSTEM F2
CONTROLSYSTEM
PREPARATION
SST
49 HOt8 9A3
Self-dragnosls
checker
Engrne signal
IT-iOFlllO~ 49 GO18 904
Sheet System selector
I 93GUF2-786
For inspection of ECU
93GOF2-787
93GOF2-801
TERMNALS 1
--I”- -
03UOFX
ENGINE CONTROL UNIT (ECU)
Inspection
1. Disconnect the ECU connectors.
2. Connect the SSTs (Engine Signal Monitor and Adapt-
er) to the ECU as shown.
3. Place
the SST (Sheet) 011 the Engine Signal Monitor.
4. Measure the voltage at each terminal.
(Refer to pages FZ-60 to F2-67.)
5. If any ECU terminal voltage is incorrect, check the related
input or output devices and wiring. If no problem is found,
reptace the ECU. (Refer to above.)
Caution l
Never apply voltage to SST terminals A and B.
F2-59