1992 MAZDA 323 sensor

-
Reading Wiring Diagrams GI
Symbol
Horn Meaning l Generates sound when current flows. Symbol Switch (1) Meaning l Allows or breaks current flow by
opening and closing circuits.
Speaker
ccl
Heater l Generates heat when current flows. Normally open (NO)
Switch (2)
I
Normally closed (NC)
Harness l Unconnected intersecting harness.
Speed sensor
+ Movement of magnet in speedometer
turns contact within sensor on and off. (Not connected)
w Connected intersecting harness.
Ignition switch
l Turning ignition key switches circuit to
operate various component.
(Connected)
Relay (1)
l Current flowing through coil produces electromagnetic force causing contact to open or close.
No current to coil Current to coil
Uormally open (NO)
Relay (2) Normally open relay (NO)
lormally closed (NC) [/I jr No flow @jj 1 Flow
Normally closed relay (NC)
Sensor (variable) a Resistance changes with other Diode l Known as a semiconductor rectifier,
components operation. the diode allows current flow in one
IA direction only.
R
CaIhode(K)--++- Anode(A)
- Flow 01 electric C”llO”,
KIIZT)-A K-A K-A
#ensor (thermistor) 0 Resistance changes with temperature. Light-emitting diode l A diode that lights when current flows.
V-ED) l Unlike ordinary bulbs, the diode does
not generate heat when it.
%u
I-
- Cathode(K) -$----- Anode(A)
Capacitor
l Component that temporarily stores
electrical charge.
----it----
Flow of current
Solenoid
l Current flowing through coil generates Reference diode l AIIOWS current to flow in one direction
electromagnetic force to operate (Zener diode) up to a certain voltage; allows current
to flow in the other direction once that
ti
n voltage is exceeded.
9

Troubleshooting GI
Measuring continuity/resistance
Touch the ohmmeter probes to the switch terminals to check
Verify the operating state of the switch before checking
continuity because readings vary accordingly.
Note Continuity is checked according to the direction of the positive
(+) and negative (-) probes ofihe ohmmeter in the circuit
containing the diode.
Connection
I Continuity
Yes
The negative (- ) probe of the ohmmeter is
connected to the positive terminal of the internal
ohmmeter battery, the positive (+) probe to the
negative terminal of the battery. No
Connect the ohmmeter probes to the sensor or solenoid valve
terminals to check resistance.
Caution
Verify the operating state of the sensor before checking
resistance because readings vary accordingly.
1. Short between the terminals with a jumper wire to discharQe
the capacitor.
2. Set the ohmmeter range to xl Ok R and connect it to the
capacitor terminals.
3. The capacitor is good if the needle of the ohmmeter swings
once and returns to its original position.
15

GI Troubleshooting
FindIng short circuits
Shorts occur between the power (positive) and ground (negative) sides of a circuit.
Therefore, finding a short circuit requires determining how the circuit is routed.
Circuits
not connected to control unit
I
Examples
ihort location 1 SvmWom
I Battery
,pOSlhl
terminal) lgnitbn switch
I Finding short circuit
4
1. Remove the fuse and
main fuse of the circuit.
2. Disconnect ail connecton
Of electrical components in the circuit.
3. Attach a voltmeter or test
Motor
M
Qi!
Short (A)
Short (8)
Short (C)
Short (0) l The motor operates
regardless of whether the
thermoswitch is ON or OFF
when the ignition switch is ..-..
ON. -
@The fuse is not melted.
0 The main fuse melts when the
ignition switch and thermo-
switch are ON and the relay is
operating.
lgnitlon switch
Switch short locatior
Short (A)
Short (B)
Short (C) Test lamp lamp to the fuse box and
reconnect each connector, beginning
nearest the power
, source. Circuits connected to control unit
1 Examples
Symptom
l Fuse melts.
Short (D)
Short (E) 14. Check the voltmeter
reading or test lamp as
the connectors are
connected.
l solenoid A operates when the
ignition switch is ON.
l The CPU transistor burns out
when the ignition switch is
turned ON.
l The CPU thinks the switch is
ON because the same
conditions exist as when the
switch is ON.
@The CPU senses the sensor
to be 0 Q because the same
conditions exist as when the
resistance value is 0 Q.
l The CPU equipped with the
self-diagnosis function outputs
the code. l-
Finding short circuit
1. Remove the fuse and main
fuse of the circuit.
2. Disconnect ail connectors oi
electrical components in the
circuit.
rest lamp 3. Attach a voltmeter or test
lamp to the fuse box and
reconnect each connector,
beginning nearest to the
power source.
Check the voltmeter reading
or test lamp as the
connectors are connected.
Sensor/switch
1. Attach the test lamp or
voltmeter to the CPU
connector.
2. Connect to the switch/
sensor connector.
3. Check the voltmeter reading
voltmeter reads OV or the test lamp
16

3-lb l ENGINE CONTROL SYSTEM (z/3)
KNOCK CONTROL UNIT
INJECTOR RESISTOR
DISTRIBUTOR
~I-01 ENGINE CONTROL UNIT (EM)
El-09 DISTRIBUTOR IEM) B l-l 1 ISC VALVE (EM)
2Y 2w 2u 2s 20 20 2M 2K 21 26 2E 2C 2A
R/B O/L G/B G f -G/Y L G/W * R/Y L/W R -G/h-G/R * Y/L Q/B 3/LGB/O
G W/L Y/B G/O W R/B R/L G/R R/Y Y x 3/BRB/#
22 2X 2V 2T 2R 2P 2N 2L 2J 2H 2F 20 28
I-12 SOLENOID VALVE
(PURGE CONTROL) (EM) 81-14 SOLENOID VALVECPRC LOW TEMP) (EM) 81-15 INJECTOR NO.1 (INJ) 81-16 INJECTOR ~0.3 (INJ) 81-17 INJECTOR N~.~(INJ) El-18 INJECTOR No.4 (IN,
1-19 WATER THERMOSENSOEBl-24 KNOCK CONTROL LJNIfBl-25 KNOCK SENSOR00 81-29 SOLENOID VALVE
Bl-30 INJECTOR RESISTOR 81-31 SOLENOID VALVE
30

Ve:BenyVdhfp
Test condttton
-roliqc lblwk
lgnhn switch ON
VI3
- bmtm
2A
28
x
2D
2E
2F
26
2H
21
2J
2K
21
2M
2N
20
2P
20
2R Test condtthw
ranabla
2s
2T
2u
2v
2W
2x
2Y
arm-up)
P
P
8°F) P
ov
ov
ov
ov
ov of sv
Approx. 2v
-
ov or 5v
tpplox. 1.5
- connected to
oveftmost warning
tluzz.af
I
I
i”e started wilh cootanl 1 Below 1.5V 1 No&ad engine 1Bo sec. alter eng
temperature is above 90% 1194°F ) and
CondilkJn
iniake air temperature is between 40%
I l@i°F) and So% (122OFj
Other condition at idle
VB
lgrition switch ON
L VE ‘Engine Signd
Idle
VFJ’ Monitor: Green
Engine speed above 2.ooO rpm during
VE and red lamps
Nash Sde”&d valve
m kw tap.)
deceteralion (alter warm-up) -
-
0 -
lanition switch ON -
-
-
-
0 lnjedor (Nos. 1. 3) -
Ignition switch ON
Idle
injector (Nos 2. 4) IgrMon switch ON
I -3 Va
I
ISC valve -
-
0
0
-
0
0
0
0
-
0
0
-
- Idle -
Lpprox. 4.01
4.!--5sv
0 of 5v Knock control unit
Engine speed above 2,GOD rf
Thio#e sensor/
Airllow mder Constant -
0 Solenoid valve
(purge conlro4) Ignition switch ON
II
-
I* I “la I
lgnitlon switch ON .-.- ._
lgnitiin swilch ON VB
-
Idle Below 1.w
210 sec. alter engine started with coolant Below 1.5V No&d engine
temperature above 90% ( 194OF) and
cofditlon
intake air temperature above 50°C
/122OF)
Other condition al idle Va - 0
0 Qrcuit-oparing
relay
sdenoid valve
(PRC high temp.) Accelerator pedal released
Accelerator pedal lully depfesw ,pprox. 0.5L
.pprox. 4.oi 22 -
1 J
Is- r,
L-7 r
2Y Zw 2U 2s 20 20 ZM 2K 21 2G 2E 2C ZA 1U IS 10 10 1M tK I, tG 1E ,C ,A
22 2X ZV 2T ZR 2P 2N 2L 2J 2H ZF 20 28 1V IT IF! ,P IN 1L 1J t” 1F 10 19 lamlion switch ON
Idle (cold engine)
Idle (alter warm-up) ov
o-l.OV
0.5-l.OV
o-0.4v
xpprox. 3.8
tipprox. 3.0
tpprox 2.5
bpprox. 2.5
Bdow 0.5v
V8 -
lncreasmg engine speed (after w
Deceleralion
lgnltro” switch ON Airllow meter -
n airflow meter intake aa
Ambient air temperalure 20°C (6
ErlQl”l? codant temperature 200(
Alter warm-up
Ignition switch ON Water
thermosensor
To&charge
rndlcator
1 I
UI “I
u-1 r
-
2Y ZW ZU ZS 20 20 2M ZK 21 2G 2E 2C ZA lU IS 10 10 1f.I 1K 11 1G 1E tC 1A
22 2X 2V 27 2P 2P 2N 2L 2J 2H ZF 2D 28 IV IT IA 1P IN IL 1.1 1H 1F ID It3
35

INSTRUMENT CLUSTER
ILLUMINATION LAMP
;REFER TO SECTION I-4
c l INSTRUMENT CLUSTER &i WARNING LAMPS 0 .F.R.GERMAI
*....ABS
COMBINATION SWITCH
(SECTION E-l. 21
ENGINE CONTROL UNIT
(SECTIIXJ
B-ICI
SECTION F-2. 3)
l-l rr
II l-l
* * w
,,“,, W/R G/ G/Y Y l-l II
II rl
WY & * 2% l-l II II l-l
R R/B
* Y/L B B/G G/W 6/B 767 G/R
B/O * * L/W V * L
1.J II iH 1G *r- fk io IC pJ ipi * Y/R * W/E R/Y
a 2% 2.3 21 w 28 n- a a x ZB 2A
K 3 34 31 3 Lx+ 3 * a x 33 3*
-02 OIL PRESSURE
SWITCH(E) C-03 BRAKE FLUID SWITCH C-04 PARKING BRAKE
(0 SWITCH(R) C-05 WASHER LEVEL SENSO C-07 WATER THERMOSENSOR
(Fg
(INJ)
pjlfzJ
ma
f
38

0 1 a ANTI-LOCK BRAKE SYSTEM (ABS)
MAIN
B( 0 (F1
4i:b
ABS
1OA
.lR-07@ STOP-
LIGHT
INSTRUMENT SWITCH DIAGNOSIS
CLUSTER (SECTIONCONNECTOR
(SECTEN c) F-2.3) ISECTZN LJ)
G SENSOR
\T- --
/I B/W (F1
1 B/W,(F)
32 23 25 26 43 INSTRUMENT
l
34 53
ABS CONTROL UNIT
NSTRUMENT
LUSTER
SECTION C) I
HEEL SPEED SENSOR ’ -
-03 Ai3S MAIN RELAY(F) O-04 ABS MOTOR RELAY (Fl
I-10 ABS WHEEL SPEEO O-II ABS WHEEL SPEED
SENSOR FR (F) SENSOR RL (R) ARS CONTROL UNIT(FR) IO-02 G SENSOR (FR)
MOTOR (F) O-06 H_VDRAzLIi UN:’ NO.lO-07 HYDRAULIC UNIT NO.dO-%? HYDRAULIC UNIT
I-12 ABS WHEEL SPEED
SENSOR RR IR)

a
l
a
.Sc+wCi!J VALVE(PRC HIGH TEMp)
R THERMOSENSOR
POWER STEERING P
ABS WHEEL
SPEED SENSOR Rk
OXYGEN &OR
RUNNlNG LIGHT RELAY No.2
RUNNINGLIGMR
PavERDooR
HEADLIGHT RELAY
ENGINE CONTROL UNIT
STOPUGHT SWITCH
HORN RELAY SEAT WARMER RELAY