1992 MAZDA PROTEGE light

FAN MOTOR E
I-
i.- 5. Connect the battery, an ammeter, and switch to the fan mo-
tor connectors for high-speed inspection.
6. Verify that the fan motor operates smoothly at the standard
current or less with the switch ON.
Current (A): 13.3 + 10% MAX
7. If the fan motor is faulty, replace it.
---“-. --
REPLACEMENT
Caution
l Position the hose clamp in the original location on the hose, and squeeze the clamp lightly
with large pliers to ensure a good fit.
1. Disconnect the negative battery cable.
2. Drain the engine coolant.
3. Remove in the order shown in the figure.
4. Install in the reverse order of removal.
7.8-11 N.m
7.8-11 N.m
(80-110 cm-kg,
1. Resonance chamber
4. Radiator cowling
2. Cooling fan connector
5.
Cooling fan
3. Radiator hose upper
6. Fan motor
E-l 5

F OUTLINE
A comparison of the new and previous models is as follows.
Engine Control Unit Terminal Relation Ship Chart
Connected to
Headlight switch Terminal
Connected to Terminal
New Previous New Previou
1H IU
Water thermosensor 2E 2Q
Diagnosis connector
(TEN terminal) / II 1 IK 1 1 Throttle sensor
Rear window defroster switch
I I 21 2K
Ground (California)
Main relay (Canada)
A/C relay
Vehicle speed sensor
P/S pressure switch
A/C switch
Blower control switch 1K 2H
IL 1J
1M --
1N 1P
10 IQ
1P 1s Distributor
(G-signal) [DOHC]
Intake air thermosensor
Solenoid valve
(Purge control)
Ground (Injector)
Ground (Output)
Ground (CPU) 2J 2G
2K 2P
20 2x
___
Stoplight switch 1Q 10
Ground (Input)
1 I I 1 ! 3D ! 2D
Cruise control main switch
1 lS / - II8cRalnardega,y
Throttle sensor
(Idle switch)
Distributor
(Ne-signal) 1T 1N
2A 2E
2B 20
2C 2N Solenoid valve
(VICS)
--.-- I_-
Solenoid valve
(Pressure regulator) [BP] 31 2s
-- -_
3M 2T
Airflow meter
Oxygen sensor
-
Fan switch 1 2D 1 IR 1 1 lniector (Nos. 2, 4) I 3v I 2v
23UOFX-01 I
F-l 4

F OUTLINE
COMPONENT DESCRIPTIONS
Component
Air cleaner
Airflow meter
Mr valve
Atmospheric pressure
Sensor
Catalytic converter Function Remark
Filters air entering throttle body
Detects amount of intake air; sends signal to intake air thermosensor and fuel pump
ECU switch included
Supplies bypass air into dynamic chamber
l Engine speed increased to shorten
when engine is cold warm-up period
l Thermowax type l Installed in dynamic chamber
Detects atmospheric pressure; sends signal Built in ECU
to ECU
Reduces HC, CO, and NOx by chemical Monolith type
reaction Charcoal canister
Stores fuel tank fumes while engine stopped Check valve
Controls pressure in fuel tank Two-way type Circuit opening relay
Voltage for fuel pump while engine running Clutch switch (MTX)
Detects clutch condition; sends signal to Switch OFF when clutch pedal released
ECU Diagnosis connector
Concentrated service connector 25pin (located near left suspension mount-
Concentrated terminals: ing block)
1. EGI self-diagnostic terminal
2. EC-AT self-diagnostic terminal
3. Test terminal
4. Fuel pump check terminal
5. Cooling fan check terminal
6. Engine rpm output terminal Dynamic chamber
Interconnects all cylinders Engine control unit (ECU) Detects the following:
1. A/C operation 1. A/C switch
2. Air/fuel ratio (Oxygen concentration) 2. Oxygen sensor
3. ATF thermosensor
4. Atmospheric pressure 4. Atmospheric pressure sensor
5. Braking signal 5. Stoplight switch (MTX)
6. Cranking signal 6. Ignition switch (START Position)
7. DRL (Daytime Running Light) operation 7. DRL relay (Canada)
8. E/L operation 8. Blower motor switch, cooling fan relay,
headlight switch, and rear window
defroster switch
9. Engine coolant temperature 9. Water thermosensor
10. Engine speed 10. Distributor (Ne-signal)
11. Ignition ON signal 11. Ignition switch
12. In-gear condition 12. Neutral and clutch switches (MTX)
13. Inhibitor switch (ATX) 13. N range, D range, S range, L range
switch
14. Intake air amount 14. Airflow meter
15. Intake air temperature 15. Intake air thermosensor
(In airflow meter)
16. No.1 piston TDC of compression
17. P/S operation
18. Shift solenoid (ATX)
19. Test signal (Ignition timing, idle speed,
Malfunction code No.)
20. Throttle valve fully closed/fully open
condition 16. Distributor (G-signal) DOHC)
17. P/S pressure switch
18. 1-2, 2-3, 3-4, Lockup solenoid
19. Diagnosis connector
(TEN terminal)
20. Throttle sensor (MTX)
21. Throttle valve opening angle
22. Turbine sensor 21. Throttle sensor (ATX) .__r
F-10

OUTLINE
Component Function Remark
Engine control unit (ECU) Controls operation of the following:
(Cont’d)
1. A/C (Cut-off) 1. A/C relay
2. Fail-safe function 2. Self-Diagnosis Checker and MIL
3. Fuel injection system 3. Injector
4. idle speed control 4. Idle speed control (ISC) valve
5. Ignition timing control system 5. Igniter
6. Monitor function 6. Monitor lamp (Self-Diagnosis Checker)
7. Pressure regulator control system 7. Solenoid valve
(Pressure regulator control) (BP)
8. Purge control system 8. Purge control solenoid valve
9. VICS 9. Solenoid valve (WCS) (DOHC) Fuel filter
Filters particles from fuel Fuel pump
Provides fuel to injectors l Operates while engine running l Installed in fuel tank Igniter
Receives spark signal from ECU and gener-
ates high voltage in ignition coil Ignition switch
Engine cranking signal sent to ECU (START position)
Inhibitor switch (ATX)
Detects in-gear condition; sends signal to Switch ON in N or P range
ECU Injector
Intake air thermosensor
Idle speed control (ISC)
valve
Main relay
(FUEL INJ relay)
MIL (Malfunction
indicator lamp)
Neutral switch (MTX)
Oxygen sensor
PCV valve
P/S pressure switch
Pressure regulator
Resonance chamber
Resonance duct
Separator
Stoplight switch
Solenoid valve
(Purge control)
Shutter valve actuator
(DOHC)
Throttle body
Throttle sensor
Injects fuel into intake port l Controlled by signals from ECU
l High-ohmic injector
Detects intake air temperature; sends signal Installed on dynamic chamber
to ECU
Controls bypass air amount Controlled by duty signal from ECU
Supplies electric current to injectors, ECU,
etc.
Lamp flashes to indicate malfunction code
number of input and output devices
Detects in-gear condition; sends signal to
ECU
Detects oxygen concentration; sends signal
to ECU
Controls blowby gas introduced into engine
Detects P/S operation; sends signal to ECU
Adjusts fuel pressure supplied to injectors
Reduces intake air noise
Reduces intake air noise
Prevents fuel from flowing into charcoal
canister
Detects braking operation (deceleration),
sends signal to ECU
Controls evaporative fumes from canister to
intake manifold
Closes/opens shutter valve to improve
torque characteristics
Controls intake air quantity
l Detects throttle valve fully closed/fully
opened condition (MTX) TEN terminal grounded
Switch ON in neutral
Zirconia ceramic and platinum coating
P/S: ON when steering wheel turned right or
left
Controlled by duty signal from ECU
For Variable inertia charging system (VICS*)
Integrated throttle sensor, dashpot, and ISC
valve
l Detects throttle valve opening angle
(A-W
l Sends signals to ECU
F-l 7

TROUBLESHOOTING GUIDE F
r
- SENSORS
z-----
‘RES-
‘URE
‘WITCH FRL (Dsy
ime Run-
ling
.ight)
:ONTROL
INIT
CANADA]
)FF
3attery
oltage)
T- IEUTRAL
rND
:LUTCH
iWITCHES
MTX) IIAGNOSIS
:ONNEC-
‘OR TEN
‘ERMINAL
rEST
‘ERMINAL) IGNITION SWITCH
s kgnal has
r IO effect
C In ECU
I neutral:
.ow volt-
rge signal
II ECU
w
-
f
I
Iriving in
iny gear:
iigh volt-
ige signal
o ECU
Battery TOP-
IGHT
WITCH UHIBITOR
iWITCH
4TX) L/C
;WITCH
5
IL
IGNAL
Sl ignal has
nl 3 effect
01 n ECU
H
0
F-f
S
C
VI
si
E
te
VI
C
VI
si
i
1 T
eadlight
r rear
‘indow
efroster
Nitch
IN: High
pltage
gnal to
CU (Bat-
try
sltage)
IFF: Low
altage
gnal to
cu
3elow
.5V)
B
S'
0
C,
C
L
E
E
II
(
\i
c
E
t’
I lower
Nitch**
r Electri-
al fan
IN: Low
foltage
signal to
iCU (Be-
3w 1.W)
IFF: High
loltage
rignal to
ICU (Bat-
ev
voltage)
I
OFF ITART
‘OSITION IN
OSITION
‘ends sig
al to
CU (Bat-
?ry
oltage) #ignal has
0 effect
#n ECU ignal has
0 effect
n ECU ignal has
0 effect
n ECU ;ignal has
IO effect
rn ECU ignal has
0 effect
n ECU
rake pedal Ggnal has
IQ effect
In ECU
1NorP
ange: No
ignal to
.cu
w
-
7D
ange: No
#ignal to
.cu
Battery
foltage)
- - - - -
ends sig-
31 to ECU
jattr ?ry
Atac
-2
/heel -
Jrned:
ow volt-
ge signal
I ECU
3elow
.5V)
teering
/heel
traight
head:
ligh volt-
ge signal
) ECU
dattery .erminal
lot
Irounded:
iigh volt-
tge Signal
3 ECU
Battery
roltage)
‘erminal
Irounded:
.ow volt-
rge signal
3 ECU
Below lo signal
ent to
cu
3elow
5V) r/C switch
IN:
iends sig-
ial to
CU (Be-
IW 1.5V)
r/C switch
IFF: No
ignal to
CU (Bat-
3ry
‘oltage) )RL ON:
w ends sig-
al to
CU (Bat-
2ry
oltage) lo signal
3 ECU
3elow
.5V) )RL OFF:
3attery
oltage)
I .5V’
medal
Sends
signal to
KU
Battery
voltage)
- -
In N or P
range:
Sends sig-
nal to ECU
PV In neutral:
Low volt-
age stgnal
to ECU
(W
I -
- - -
OFF OFF OFF OFF OFF OFF OFF
OFF OFF
23UOFX-0’
+’ Blower switch: 2nd position or more
F-21

F TROUBLESHOOTING GUIDE
RELATIONSHIP CHART
OUTPUT DEVICE
INPUT DEVICE
DIAGNOSIS CONNECTOR
[TEN TERMINAL) 0 0 0 0
IGNITION SWITCH (START POSITION) 0 0 0 0 0 0
E/L SIGNALg4 0
0
P/S PRESSURE SWITCH 0 0
B/C SWITCH 0 0 0
INHIBITOR SWITCH (ATX) 0 0 0 0 0 0 0
NEUTRALANDCLUTCH
SWITCHES (MTX) 0 0 0 0 0 0 0
STOPLIGHT SWITCH 0
0
&TMOSPHERIC PRESSURE SENSOR
[IN ECU) o 0 0 0 0
rHROTTLE SENSOR 0 0 0 0 0 0 0
INTAKE AIR THERMOSENSOR 0 0 0 0 0
MRFLOW METER 0 0 0 0 0
3XYGEN SENSOR 0 0 0 0
JVATERTHERMOSENSOR 0 0 0 0 0 0 0
G-SIGNAL*’ 0 0
3ISTRIBUTOR
Ne-SIGNAL 0 0 0 0 0 0 0 0
-- ,.-, ,--., ,.*
+z
*3 &HC
MIL: Malfunction Indicator Lamp
r.9u”rn-” I
*’ E/L SIGNAL: Blower fan control switch second position or higher, cooling fan operating, headlights ON, or rear win-
dow defroster switch ON
F-24

F TROUBLESHOOTING GUIDE
11 ROUGH IDLE/ENGINE STALLS AT IDLE - WHEN A/C, P/S, OR E/L ON
DESCRIP.
*Engine stalls or vibrates excessively at idle when A/C, P/S, or E/L ON TION *A/C, P/S, daytime running lights (Canada), headlights, blower fan and electric cooling fan operate normally
*Idle condition is normal when A/C, P/S, and E/L is OFF (TROUBLESHOOTING HINTS]
@ Idle speed control system malfunction l Engine speed feedback control inoperative ;TEP INSPECTION
ACTION
1
Check if “00” is displayed on Self-Diagnosis Yes
Checker with ignition switch ON Go to next step W page F-82 No
Service Code No. displayed
Check for cause (Refer to specified
SYSTEM SELECT: 1 check sequence) w page F-83
“88” flashes
W:SELFTEST
Check ECU terminal 1 F voltage w page F-150
Specification: Battery voltage
(Ignition switch ON)
* If OK, replace ECU w page F-149
c3 If not OK, check wiring between
ECU and Self-Diagnosis Checker
2 Check switches for correct operation by Self-
Yes
Diagnosis Checker Monitor Lamp with ignition Go to next step
switch ON CT page F-105
No Lamp not ON or OFF with specltied
switch
Check for cause (Refer to specified
check sequence) w page F-108
Lamp always ON
Check wiring between ECU terminal ID
and Self-Diagnosis Checker
W:SELFTEST
3
EhFKk if ECU terminal IK (MTX) II (ATX) voltage
Yes Try known good ECU and check if con-
dition improves w page F-150 w page F-149
Specification: Battery voltage (at Idle)
1 K (LGIY)
No
Check for short circuit in wiring be-
tween diagnosis connector terminal
TEN and ground
23UOFX-02
-’
F-48

ENGINE TUNE-UP F
03UOFX.051
03UOFX-051
- w4TEN I
Air Cleaner Element
Inspection
1. Check the air cleaner element for excessive dirt, damage,
or oil.
Caution
l Do not use compression air to clean the element.
2. Replace the element if necessary.
ADJUSTMENT
Preparation
1. Warm up the engine to normal operating temperature.
2. Turn all electric loads OFF.
3. Connect the
SST to the diagnosis connector.
4. Connect a timing light.
5. Connect a tachometer to the diagnosis connector
IG- ter-
minal as shown.
6. Set switch @to position 1.
7. Set TEST SW to SELF-TEST.
Note
l If the SST is not used, jump across the TEN termi-
nal and the GND terminal of the diagnosis con-
nector.
Ignition Timing
1. Perform “Preparation”. (Refer to above.)
2. Check if the timing mark (yellow) on the crankshaft pulley
and the mark on the timing belt cover are aligned.
Specification:
Engine
Ignition Timing BTDC B6 BP SOHC BP DOHC
6O-8* 4O--6O go-110
SOHC DOHC
I 03UOFX-054
3. If the marks are not aligned, loosen the distributor lock bolts,
and turn the distributor to make the adjustment.
4. Tighten the distributor lock bolts to the specified torque.
Tightening torque:
19-25 N#m (1.9-2.6 m-kg, 14-19 ft-lb)
5. Disconnect the SST.
F-79