1990 MAZDA 232 headlights

TRUUBLESHOOT1NG GUIDE
TROUBLESHOOTING GUIDE [BP TURBO]
RELAT1ONSt-W CHART
,
i OUTPUT DEVICE
INPUT DEVfCE
KNOCK SENSOR
1
I
-
I-
3 DIAGNOSIS CONNECTOR
(TEN TERMfNAL)
IGNITION SWITCH
(START POSITION)
0 0 0 Cl
EIL SIGNAL * ’
0 0
0 0
P/S PRESSURE SWITCH
0
1
0 0 A/C SWITCH
0 0 0 0 NEUTRAt AND CLUTCH
SWfTCHES 0 0
0
STOPLIGHT SWITCH
0
0
0 0 0 ATMOSPHERIC PRESSURE
SENSOR (IN ECU) 0
0
THROTTLE SENSOR 0 0 0 0 0
0 INTAKE AfR THERMOSENSOR 0
AlRFLOW METER 0 0
I------ i
0 OXYGEN SENSOR
WATER THERMOSENSOR 0
0 0
O G-SIGNAL
DISTRIBUTOR
I---- Ne-SIGNAL I-L 0 0 L-
0
0
L.- 0 0
L 0 0
93GOF2-i45
*I E/L SIGNAL: Slower fan control switch Second position or higher, cooSing fan operating? headlights ON, or rear wtn-
dow defroster switch ON

F2 CONTROLSYSTEM
erminat Input ’ Output Connected to Test condition Correct voltage Remark
1N 0 I Throttle sensor Accelerator pedal released &low l.OV j Ignition switch
(Idle switch)
Accelerator pedal depressed Approx. 12V *N
IO I 0 j [ Stoplight switch Brake pedal released Betow 1 .OV -
1P j 0 1 i P/S pressure lgnitlon switch ON Approx. 12V
I
switch
f/S ON at idle Below 1 .UV
I
P/S OFF at idle Approx. 12V -
I
to 0 A/C switch A/C switch ON
NC switch OFF Beiow 2.W ignition switch
ON and blower
Approx* t2V motor ON
i
1R 0 Electric fan switch Fan operating (Engine coolant tempera- Betow l.OV
ture over 91 *C (t96*F) or diagnosis con-
-
nector terminal TFA grounded)
Fan not operating (Idle) Approx.. f 2V
IS 0 Blower control Blower controf switch OFF or 1st position Approx. 13 Ignition switch
switch
Blower control switch 2nd or higher po- Below 7 .OV ON
sition
IT
Cl Rear window
defroster switch Rear window defroster switch OFF
Rear window defroster switch ON Below 1 .OV Ignition switch
Approx. 12V ON
1u 3 Headlight switch Headlights ON Approx. 12V
-
Headlights OFF Below 1 .OV
-Iv Cl ’ Neutral/Clutch
Neutral position or clutch pedal Below I .OV
switches
depressed
Others Approx. 12V
l-7 I r
f
2V 2W 2U 25 20 20 2M 2K 21 2G IZE 2C 2A IU IS 10 10 IM 1K 11 1G rE tC IA
22 2X (2V 2T 2R 2P 2N 2L 2J 2H’ZF 20 2B fV 1T 1R IP IN 1L 7J III If ItI 1B l F2-62

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