1992 MAZDA PROTEGE check engine light

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

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

SELF-DIAGNOSIS FUNCTION F
SWITCH MONITOR FUNCTION
Individual switches can be inspected by the SST (Self-Diagnosis checker).
Note
l The TEN terminal of the diagnosis connector must be grounded and the ignition switch ON
(engine stopped).
l If either of the switches remain activated, the monitor lamp will be illuminated.
ECU
NEUTRAL SWITCH (MTX)
CLUTCH SWITCH (MTX)
=d-’ 1
BATTERY
INHIBITOR SWITCH (ATX)
STOPLIGHT SWITCH (MTX)
HEADLIGHT SWITCH MONITER LAMP
REAR WINDOW (SELF-DIAGNOSIS CHECKER)
DEFROSTER SWITCH
AIC SWITCH
BLOWER SWITCH
THROTTLE SENSOR asp-
- _
COOLING FAN SWITCH
03UOFX
Switch
Clutch switch
Neutral switch (MW
(M-W Self-Diagnosis Checker (Monitor lamp)
Light ON Light OFF Pedal released Pedal depressed
In gear Neutral Remark In gear
Clutch pedal released
Inhibitor switch
(ATX) L, S, D or R range
N or P range -
Throttle sensor Pedal depressed (Not fully) Pedal released/fully depressed -
Stoplight switch
Pedal depressed Pedal released -
Headlight switch
ON
OFF Headlights/parking lights: ON
Blower switch
ON
OFF Blower switch at 2nd or
above position
AIC switch
ON OFF Fan speed control at 1st po-
sition
Rear window defroster
switch ON
OFF -
Water thermoswitch Fan operating Fan not operating -
23UOFX-084
F-l 05

SELF-DIAGNOSIS FUNCTION
Inspection Procedure
1. Connect the SST (System Selector) to the diagnosis con-
nector.
2. Set the switch @ to position 1.
3. Set TEST SW to SELF-TEST.
03UOFX.090
MONITOR LAMP
T
03UOFX-091
Procedure
4. Connect the SST (Self-Diagnosis Checker) to the System
Selector and a ground.
5. Set the select switch of the Self-Diagnosis Checker to posi-
tion A.
6. Turn the ignition switch ON.
7. Check if Monitor Lamp illuminates when each switch is made
to function as described below.
Caution
* If either of the switches remain activated, the mon-
itor lamp will be illuminated.
l Do not start the engine.
I
I Set conditions to deactivate each switch l All accessories OFF l Transaxle in neutral l All pedals released NO
-
Verify that monitor lamp does not illuminate
YES
Check each switch as described Check each switch and related wire harness
*Clutch and Neutral CT- pages F-l 72,173
switch
*Throttle sensor w page F-169 l Stoplight switch c7 Section T l Headlight switch c7 Section T l Rear defroster switch T;P Section T l Blower switch [r+ Section T
l Inhibitor switch a Section K l A/C switch 0 Section U l Water thermoswitch c7 Section E
23UOFX-OS!
Neutral and Clutch switch (MTX)
Shift transaxle into gear
Check that monitor lamp illuminates with clutch pedal
released
YES NO PC: l Neutral switch malfunction a page F-173 l Clutch switch malfunction w page F-172
*Open circuit in related wire
harness
l ECU terminal 1 V voltage
incorrect w page F-152
l ECU malfunction
Depress clutch pedal
Check that monitor lamp does not illuminate
Return transmission to neutral PC:
*Clutch switch malfunction w page F-172
23UOFX-088
F-l 06

CONVENTIONALBRAKESYSTEM P
1 SUOPX-001
03UOPX-03
0
o3uoPx-os
0
POWER BRAKE UNIT
Quick Inspection, On-vehicle
Power brake unit function check
k:;;p{e method)
1. With the engine stopped, depress the pedal a few times.
2. With the pedal depressed, start the engine.
3. If immediately after the engine starts the pedal moves down
slightly, the unit is operating.
Step 2
1. Start the engine.
2. Stop the engine after it has run for
1 or 2 minutes.
3. Depress the pedal with the usual force.
4. If the first pedal stroke is long and becomes shorter with
subsequent strokes, the unit is operating.
5. If a problem is found, inspect for damage of the check valve
or vacuum hose and examine the installation. Repair if
necessary, and inspect it once again.
Step 3
1. Start the engine.
2. Depress the pedal with the usual force.
3. Stop the engine with the pedal held depressed.
4. Hold the pedal down for
about 30 seconds.
5. If the pedal height does not change, the unit is operating.
6. If there is a problem, check for damage to the check valve
or vacuum hose, and check the connection. Repair if neces-
sary and check once again.
If the nature of the problem is still not clear after the 3 steps
above, follow the more detailed check described in “Method-
using tester,” below.
(Method-using tester)
Connect a pressure gauge, vacuum gauge, and pedal depres-
sion force gauge as shown in the figure. After bleeding the
air from the pressure gauge, conduct the test as described
in the 3 steps below.
Note
l Use commercially available gauges and pedal
depression force gauge.
a) Checking for vacuum loss
Unloaded condition
1. Start the engine.
2. Stop the engine when the vacuum gauge reading reaches
500 mmHg (19.7 inHg).
3. Observe the vacuum gauge for 15 seconds. If the gauge
shows 475-500
mmHg (18.7-19.7 inHg), the unit is
operating.
P-13

PARTS INDEX
‘I
A
ACCELERATOR CABLE ............................. F-l 14
ACCELERATOR PEDAL ............................. F-l 14
AIR CONDITIONER ...................................... u-30
A/C RELAY.. ........................................... U-56
A/C SWITCH ...........................................
U-57
COMPRESSOR.. ..................................... U-41
CONDENSER.. ....................................... U-53
CONDENSER FAN ................................. u-57
CONDENSER FAN RELAY .................... U-56
COOLING UNIT ..................................... U-38
MAGNETIC CLUTCH ............................. u-51
RECEIVER/DRIER .................................. U-52
REFRIGERANT PRESSURE SWITCH.. .. U-55
AIR FLOW METER ..................................... F-l 68
AIR VALVE.. ................................................ F-l 16
ALTERNATOR .............................................. G-10
ANTENNA FEEDER
AUDIO
....... .......................................................................................... T-i;
AUTOMATIC TRANSAXLE ............................. K-l
2-4 BRAKE BAND ................................ K-l 97
3-4 CLUTCH.. ....................................... K-l 87
ACCUMULATORS ................................ K-l 67
ATF ....................................................... K-135
ATF THERMOSENSOR ........................ K-142
BEARING COVER ASSEMBLY ............ K-208
CLUTCH ASSEMBLY ........................... K-l 72
CONTROL VALVE BODY.. .....
K-21 0,224,234
DIFFERENTIAL ..................................... K-236
DRIVE PLATE.. ..................................... K-267
EC-AT CONTROL UNIT ....................... K-144
HOLD SWITCH ..................................... K-140
HYDRAULIC CIRCUIT .......................... K-278
IDLER GEAR ........................................ K-203
INHIBITOR SWITCH ............................. K-l 41
LOW AND REVERSE BRAKE .............. K-192
MAIN CONTROL VALVE BODY .......... K-220
OIL COOLER.. ...................................... K-265
OIL PUMP ............................................
K-169
OIL SEAL ..............................................
K-209
ONE-WAY CLUTCH 2
CARRIER HUB ASSEMBLY ............... K-185
OUTPUT GEAR .................................... K-206
P RANGE SWITCH.. ............................. K-271
PREMAIN CONTROL VALVE BODY .a. K-218
PULSE GENERATOR ........................... K-142
SELECTOR LEVER ............................... K-272
SHIFT MECHANISM ............................. K-269
SHIFT-LOCK ACTUATOR
..................... K-271
SMALL SUN GEAR AND
ONE-WAY CLUTCH 1 ........................ K-l 82
SOLENOID VALVE.. ............................. K-l 43
SPEEDSENSOR .................................. K-l 43
THROTTLE CABLE .............................. K-l 37
TORQlJE CONVERTER.. ...................... K-l 66
TRANSAXLE UNIT. ......... K-149,153,246,261 UPPER CONTROL VALVE BODY.. ..... K-215
BACK-UP LIGHT SWITCH..
..........................
BATTERY T;4;
- .......................................................
BLOWER UNIT ............................................
U-23
BRAKE FLUID.. .............................................. P-8
BRAKE MASTER CYLINDER. ...................... P-10
BRAKE PEDAL ...............................................
P-8
C
CALIPER .................................................. P-21,26
CARGO COMPARTMENT LAMP ................. T-54
CENTRAL PROCESSING UNIT..
.................. T-55
CHARCOAL CANISTER ............................. F-l 41
CHECK VALVE (TWO-WAY) .......................
CHECK-AND-CUT VALVE - .......................... ;-;b$
CIRCUIT OPENING RELAY.. ...................... F-129
CLUTCH COVER ......................................... H-l 7
CLUTCH DISC ............................................. H-l 7
CLUTCH FLUID ............................................. H-4
CLUTCH MASTER CYLINDER.. .................... H-7
CLUTCH PEDAL ............................................ H-5
CLUTCH RELEASE CYLINDER..
................. H-12
CLUTCH SWITCH (MTX) ............................ F-l 72
COMBINATION SWITCH .............................. T-23
COWL GRILLE ............................................. S-53
CRUISE CONTROL UNIT.. ...................... T-78,85
D
DASHBOARD ............................................... S-94
DASHPOT ................................................... F-l 42
DISTRIBUTOR .............................................. G-20
DOOR LOCK TIMER UNIT ........................... T-17
DOOR MIRROR ............................................ S-54
REMOTE CONTROL MIRROR ............... S-56
REMOTE CONTROL MIRROR SWITCH. S-55
DOOR SPEAKER .......................................... T-98
DRIVE SHAFT.. ....................................... M-l 7,21
DRL RELAY.. ................................................ T-18
DRL RESISTOR ............................................ T-46
DUAL PROPORTIONING VALVE..
............... P-l 6
DYNAMIC CHAMBER ................................ F-l 12
E
ELECTRIC COOLING FAN SYSTEM ........... E-13
ENGINE (B6 & BP SOHC) ........................... Bl-2
CAMSHAFT ..........................................
Bl-58
CAMSHAFT PULLEY ...........................
Bl-65
CONNECTING ROD ............................. 81-63
PI-I

T.&condition
-t
Off
IQ”&” switch
ON
Whik cranking
lgnitlon switch ON
Test switch at “SELF-TEST”
Lamp illuminated for 3 sec. after ignition
SwiIch OFF-KIN
Lamp not illuminated after 3 sec. collect vdtaQe
ReRlar*
ve
For backup
ov
-
V%
Approx. tov
ov
4 5--5.5v With Self-
D&Q”& Check-
er and system
Vi3 st?lt?ctor Input &PJ
- -
0
0
0
0
0
0
- -
- -
0
0
c
- -
0 connectkfl to mnina
Connection to
Stoplight swtch Test condition
-L 1A
Bake pedal released
IEI
IC Main relay
(FUEL INJ relay) Brake pedal depressed
lQ”ih0” switch ON
___-- P/S Qrc?ss"re
switch
Ignition switch
(START) P/S ON at idle
P/S OFF at idle
A/C switch ON
A/C switch OFF
Cwlng fan operatng (Engine coolant tem-
perature over 97°C (207°F) or dlagnosls
connector terminal TFA grounded) (IG ON)
Fan not ooeralmg (Idle) 1D .self-mag”osls
Checker
(Monitor lamp) A!C switch
coohng fan swtctl
Test switch at “02 MONITOR” at idle
Monitor lamp ilfummated
Test switch at “02 MONITOR” at idle
Monitor lamp not illuminated
Lamp illuminated for 3 sec. after ignition
switch OFF&N
Lamp not illuminated after 3 ser.
Lamp illuminated
Lamp not #lluminated VB
Below 2.w With System
Selector test
VB swtch at
“SELF-TEST”
Eelow 2.5v
VS Blower Control
swttch Blower control switch OFF or 1 st posihon
Blower control swtch 2nd or htgher
position 1E
Malfunction indicator
lamp
NJ
Rear window defroster swtch OFF Rear wmdow
defroster switch
Headkght switch Rear window defroster Switch ON
-2-A - I
tieadlghts ON
Headlights OFF
Neutral positton or clutch pedal
depressed
OlhWS l Wiih Self-
DkQnosls
Checker and
Svstem Selector Self- Diaanosis Buzzer sounded for 3 sec. after ignition
switch OFF-ON
Buzzer not sounded after 3 set 6&w 2.5v
V8 Checke;
(Cede Number) I
ov Ignition swtch
ON NeulraliClutch
switches
. ‘.&h System
Selector test
switch at Buzzer sou”ded
1 Below 2.5V 1
VB
ov -
ov -
ov -
ov -
APprox. ov
or 4 5-5 5v
-
Approx. 2V
-
-
AQWOX. Ov
or 4 5-5 5v
-
APQ~OX 1.5V Buzzer not sounded
I VE
I
Ground (Injector)
Ground
(OUtQUt)
Ground (CPU)
Grou”d (Input)
constant
lgnlti swtch ON
klk “SELF-TEST”
ov
-
Ap~rox O.2V
- - Constant
Co”stant lgnller
1H
Constant
Igntho” swdch ON -
- D&ribulor
(Ne-sIgnal) II
1J
1K
1L
1M
1N -
fgnition switch ON
AX switch ON al idle
NC switch OFF at Idle
System Selector lest switch at
“0-z MONITOR” I -
- VB
5&w 2.w -
Vi3
VB Ignition switch
ON
System Selector test swatch at
“SELF-TEST”
ParkIng brake pulled wth lgndlon swtch ON
(DRL OFF) ov
VB
l DRL: oaytime Running tigms
Idle (DFtL ON) Below 2.5v A/C relay
Idle
-
Ignition swtch ON
-
Distributor
(G-stgnal) [DOHC]
3ignosis
x”“ec1or
,TEN terminal) Idle
3RL relay (canada)
-
Accelerator pedal released
Accelerafor pedal depressed
-
ov
VB
-
Ignition switch
ON rhr0ttte sensor
‘Idle switch)