relay MAZDA 232 1990 Suplement Owner's Manual

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).

F2 CONTROL SYSTEM
Terminal voltage [BP TURBO]
eminal input Output , 1 Connected to Test condition Correct voltage Remark
IA - - Battery Constant Approx. 12V for backup
15 0 Main relay OFF Approx. OV
(FUEL INJ relay) tgnltlon switch
-
ON Approx. 12V
1c 0 1 Ignition switch Wniie cranking Approx. 1 OV
-
(START)
lgnrtron switch ON Approx. OV
ID 0 Self -Diagnosis Test switch at “SELF-TEST” With Self-
Checker Lamp illuminated ior 3 sec. after ignition Approx. 5V Diagnosis Check-
(Monitor lamp) switch OFF* ON er and System
Lamp not illuminated after 3 sec. Approx. 12V Se’ector
Test switch at
“02 MONITOR” at idle
Monitor lamp illuminated Approx. 5V
Test switch at
“02 MONITOR” at idle
Monitor lamp not illumrnated Approx. 12’4
-lE - - - -
- -
1F 0 Self-Diagnosis Buzzer sounded for 3 sec. after ignition
Below 2.5V l With Self-
Checker switch OFF -+ ON Diagnosis
(Code Number)
Buzzer not sounded after 3 sec. Approx. 12V Checker and
Buzzer sounded Below 2.9 System Selector
l With System
Buzzer not sounded Approx. 12V Selector test
switch at
“SELF-TEST’ ’
I I 1G
0 Igniter
7H
0 Solenoid vahe
(Wastegate)
l!
0 Fuel pump
resistor/relay
I
lJ I r-Tcreiay Ignition switch ON
ld!e
Engine speed below 5,300 rpm
Engine speed above 5,300 rpm
While cranking
Idle
Ignition switch ON
AK switch ON at idle 1 Approx. OV
-
Approx. 0.2V
Approx. 12V
-
Below 1.5V
Approx. 1 OV
-
I3elow 15V
Approx. 12V
Below 2.5V
AIC switch OFF at idle Approx. 12V
-
IK 0 Diagnosis System Selector test switch at
connector
(TEN terminal)
1L - - -
- -
-
IM
t 0
1 Ground (Australia) Constant Below 1 .OV Not used
(Except Australia)
F2-60

CONTROL SYSTEM F2
Incorrect voltage Possible cause
Always OV
l ROOM 10A fuse burned l Open circuit in wiring from ROOM 10A fuse to ECU termrnal IA
Always OV
I l Main relay maifunctlon l Open or short crrcu~t in wirrng from main relay to ECU termrnal 1 B
Always OV (Srarrer turns)
l Open or short circuit in wiring from ignition switch to ECU terminal 1C
Always UV
l Main relay (FUEL INJ relay} malfunctron l Open circuit in wiring from main relay to diagnosis connector terminal + B l Open or short circuit in wiring from dragnosls connector terminal MEN to
ECU terminal 1D
Always approx. 12V
I . Poor connection at ECU connector
l ECU matfunction
Always approx. 5V
l ECU malfunction
-
I -
Always below No disptay on Self- . Main relay (FUEL INJ retay) malfunction (Refer to page F3-142)
2.5V Diagnosis Checker l Open circuit in wiring from main relay to diagnosis connector termjnal + B
“88” displayed and
l Open or short circuit in wiring from diagnosis connector terminal FEN to
buzzer sounds con- ECU terminal 1 F
tinuously
Always approx. 12V
l Poor connection at ECU connector l ECU malfunction
Always OV
l Short circuit in wiring from igniter to ECU terminal tG
Atways OV or approx. 12V
l Refer to Code No.42 Troubleshooting (Refer to page F2-30)
Always approx. 12V
l Fuel pump resistor/relay malfunction
Always OV
l Open or short circuit in wiring from ECU terminal 1 I to resistor/retay
Always below
A/C does not operate
l AJC relay malfunction
23 l Open circuit in wiring from ignition switch to NC relay l Open circuit in wiring from A/C relay to ECU terminal IJ
A/C switch OFF but
l Short circuit in wiring from A/C relay to ECU terminal IJ
AIC operates
l ECU matfunction
Always approx. t2V
Always below 1 .OV
l Poor connection at ECU connector l ECU malfunction
l Short circurt in wiring from diagnosis connector terminal TEN to ECU termi-
nal 1K
Always approx. 12V
l Open circutt in wiring from diagnosis connector terminal TEN to ECU termi-
nal lK
l Open c~rcud in wiring from diagnosis connector terminal GND to ground
Always above 1 .OV
I
l Open circuit in wiring from ECU terminal 1 M to ground
F2-61

CONTROL SYSTEM F2
Incorrect voltage
Always below 1 .OV Possible cause
l Throttle sensor misadjustment l Short circuit in wiring from throttle sensor to ECU terminal IN l ECU malfunction
Always approx. f 2V
Atways below 1 .OV (Stopfights OK)
Always below 1 .OV
l Throttle sensor misadjustment l Open circuit in wiring from throttle sensor to ECU terminal IN l Open ctrcuit in wiring from throttle sensor to ECU terminal 20
l Open crrcurt in wiring from stoplight switch to ECU terminal 10
l P/S pressure switch malfunction l Short circuit in wirrng from P/S pressure switch to ECU termrnai 1 P
l ECU malfunction
Always approx. 12V
Atways below 2.5V (Btower fan OK) . P/S pressure switch malfunction
l Open circuit in wiring from P/S pressure switch to ECU terminal I P l Open circuit in wiring from P/S pressure switch to ground
l A/C switch malfunction l Short circuit in wiring from A/C switch to ECU terminal 1 Q l Poor connection at ECU connector l ECU malfunction
Always approx. 12V (Blower fan OK)
l ’ A/C switch malfunction l Open c~rcurt in wiring from NC switch to ECU terminal 1Q l ken circuit H-I winnu from A/C switch to blower control switch
Always below 1.W
l Open or short circuit in wiring from fan relay to ECU terminal IR
(Electrkal cooling fan UK} l ECU malfunctron
Always below 1 .OV (Blower fan OK)
l Short crrcutt in wiring from blower control swrfch to ECU terminal IS l Poor connection at ECU connector l ECU malfunction
Always approx. 12V (Blower fan OK)
Always below Illumination lamp
1.w ON when rear
window defroster
switch ON 1
l Open circurt in wrring from blower control switch to ECU terminat IS
I
l Open or short circuit rn wiring from rear window defroster switch to ECU
terminal 1 T
ftlumination lamp
never ON
l Open circuit in wiring from ignition switch to rear window defroster switch
l Rear window defroster switch malfunction I
Always below 1 .OV (Headlights OK)
l Open or short circurt in wiring from headlight relay to ECU termtnal 1 U
Always below 1 .OV
Always approx. l2V
l Neutral switch malfunction l Clutch switch malfunction l Short circuit in wiring from ECU terminal IV to neutral or clutch switch
l Neutral switch maifunctton l Clutch switch malfunction l Open circuit in wiring from ECU terminal IV to neutral or clutch swttch
l Poor connection at ECU connector
93GOFZ789
F2-63

F2 CONTROLSYSTEM
Terminal I Input Output Connected to Test condition Correct voltage Remark
25 0
Overboost warning lgnltion switch ON Approx. 12V
-
buzzer
2T 0 1 Solenoid valve 180 seconds atter engine started when Below 1 SV
(Pressure regulator) engine coolant temperature above 90%
(I 94OF) and Intake air temperature above -
58OC (13WF)
1 Other condition at Idle Approx. 12V
2u 0 Injector (Nos. I 1 3) Ignrtion switch ON Approx. 12V * Engine Signal
Idle Approx. 12V’ Monitor: Green
and red lamps
Engrne speed above 2,000 rpm on de- Approx. f2V
flash
celeratlon (Atter warm-up)
2v 0 Injector (Nos. 2, 4) lgnitlon swrtch ON Approx. 12V
Idle Approx. 12V’
Engine speed above 2,000 rpm on de- Approx. 12V
ceieration (After warm-up)
2W 0
ISC valve Ignition switch ON Approx. 7V
-
Idle Approx. 9V
2x 0 Solenoid valve Ignition switch ON Approx. 12V
(Purge control)
t Idle -
Approx. f2V
t
2Y 0 Cmxit opening Ignition switch UN Approx. 12V
-
relay
Idle Below 1 .OV
22 - - - - - -
-L J
u-
v I U-1 l-
2y 2w 2u 2s 20 20 2M 2K 21 2G 2E 2C
2A 1U 1S IQ 10 1M 1K 11 1G 1E IC 1A
22 2X 2V 2T 2R 2P 2N 2L 2.J i’t-( 2F 2D 2B 1V 1T 1R tP IN IL I..! ItI IF
tD 18
F2-66

CONTROLSYSTEM F2
I
7
Incorrect voltage Possible cause
Always OV l Open or short circuit in wjring from ECU terminal 2s to buzzer
Always OV or approx. 12V
1 l Refer to Code No.25 Troubieshootlng
Always OV
1
l Marn relav (FUEL INJ relay) malfunction
/ l Open or shbrt circuit in wi&g from injector to ECU terminal 2U or 2V
Always approx. 12V
l ECU malfunctron
Always OV or approx. t2V
l Refer to Code No.34 TroubleshootIng
Always OV or approx. 12V
l Refer to Code No.26 Troubleshooting
Always OV
l Open or short circuit KI wiring from ECU terminal 2Y to relay
f2-67