1992 MAZDA PROTEGE spark plugs

ON-VEHICLE MAINTENANCE
13EOB2-015
DEFLECTION CHECKING POINT
13EOE2-011
23UOB2-017
23UOB2-018
Steps After Installation
1. Connect the negative battery cable.
2. Start the engine and check as follows:
l Ignition timing. (Refer to page B2-8.) 10. Loosen the tensioner lock bolt to apply spring tension to
the timing belt.
11. Tighten the tensioner lock bolt.
Tightening torque:
37-52 Narn (3.8-5.3 m-kg, 27-38 ft-lb)
12. Install the pulley boss and pulley lock bolt.
13. Turn the crankshaft 2 and 116 turns clockwise and verify
that the timing marks are correctly aligned.
14. Measure the timing belt deflection by applying moderate
pressure (98 N,
10 kg, 22 lb) midway between the cam-
shaft pulleys.
If the deflection is not correct, repeat from Step 10 above.
Deflection:
9.0-11.5mm (0.35-0.45 In) at 98 N (10 kg, 22 lb)
Spark plug
1. Install the spark plugs.
Tightening torque:
15-23 Nern (1.5-2.3 m-kg, 11-17 ft-lb)
Pulley lock bolt
1, Hold the crankshaft with the SST and tighten the pulley lock
bolt.
Tightening torque:
157-187 N*rn (18-17 m-kg, 118-123 ft-lb)
23UOB2-019
82-l 5

B2 ON-VEHICLE MAINTENANCE
Harnesses
1, Disconnect the harness connectors shown in the figure.
.~
DISTRBUTOR
GRqUND
B2-18
Water bypass pipe
1. Remove the transaxle installation bolt as shown in the figure.
2. Remove the exhaust manifold nut as shown in the figure.
3. Remove the water bypass pipe from the cylinder head as-
sembly.
Timing belt
Note
l Remove all spark plugs for easier rotation of the
crankshaft.
1. Turn the crankshaft and align the marks.

82 ASSEMBLY
Oil Level Gauge Pipe Stay
1. Install the oil level gauge pipe stay.
Tightening torque:
7.8-l 1 N-m (80-l 10 cm-kg, 89-95 in-lb)
Oil Level Gauge
1. Install the level gauge.
Spark Plug
1, Install the spark plugs.
Tightening torque:
15-23 N*m (1.5-2.3 m-kg, 11-17 ft-lb)
Oil Pressure Switch
1. Install the oil pressure switch.
Tightening torque:
12-18 N-m (120-180 cm-kg, 104-156 in-lb)
Oil Cooler
1. Remove all foreign material from the oil cooler mounting
surface.
2. Apply a small amount of clean engine oil to the rubber seal
of the oil cooler.
3. Install the oil cooler with paint mark (white) facing up.
4. Tighten the oil cooler lock nut.
Tightening torque:
29-39 N.m (3.0-4.0 m-kg, 22-29 ft-lb)
5. Connect the harness to oil pressure switch.
Oil Filter
1. Remove all foreign material from the oil filter mounting
surface.
2. Apply a small amount of clean engine oil to the rubber seal
of the oil filter.
3. Install the oil filter and tighten it by hand until the rubber
seal contacts the base.
4. Tighten the filter 1 and 116 turns with a filter wrench. --_

TROUBLESHOOTING GUIDE
TEP INSPECTION ACTION
4 Check if ECU terminal voltages are OK Yes Go to next step
MTX...Especially IC, 20 and 2Q
ATX... Especially lC, 2E and 3D v page F-150
No Check for cause ~3‘ page F-151
5
Check for air leakage of intake air system com- Yes Repair or replace
ponents
No Go to next step
6 Check if engine starts when water thermosensor Yes Check water thermosensor c7 page F-158 is disconnected
Check for correct engine compression 82-10 ’ No
Check engine condition CIP page Bl-10
Engine compression: 82-10
l BP SOHC l Worn piston, piston rings or cylinder 834 kPa (8.5 kg/cm*, 121 psi)300 rpm
wall
l BP DOHC l Defective cylinder head gasket 883 kPa (9.0 kg/cm*, 128 psi)-300 rpm l Distorted cylinder head
l B8 l Improper valve seating 932 kPa (9.5 kg/cm*, 135 psi)300 rpm *Valve sticking in guide
9 Check if spark plugs are OK Yes Go to next step CT- page G-18
1.0-l .l mm
(0.039-0.043 in) DAMAGE AND
DETERIORATION No Clean, or replace c7 page G-18
10 Try known good ECU and check if condition
improves CT- page F-149
23UOFX-01 I
F-33

F TROUBLESHOOTING GUIDE
8 ROUGH IDLE/ENGINE STALLS AT IDLE - ALWAYS
bESCRIP- l Engine starts normally but stalls or vibrates excessively at idle in every condition
‘ION TROUBLESHOOTING HINTS]
D Air/Fuel mixture too lean @ Incorrect idle speed
l Air leakage l Idle speed misadjustment l Fuel injection control malfunction l Idle speed control malfunction
*Low fuel line pressure @ One or more spark plugs not firing
3 One or more injectors clogged or not operating @ Low engine compression
3 Low intake air amount @ Airflow meter stuck INSPECTION
1
1
2
3
4
5
6
- Check if “00” is displayed on Self-Diagnosis
Checker with ignition switch ON w page F-82
SYSTEM2ELECT: 1
M v’SELECT SW: A TEST
Check if ECU terminal voltages are OK
MTX...Especially 2D, 20 and 2Q
ATX... Especially 2B, 2E and 3D CT page F-150
Disconnect high-tension lead at idle and check if
engine speed decreases equally at each cylinder
Check for injector operating sound at idle
Check if battery voltage exists at injector connec-
tor (W/R) wire
Check if strong blue spark is visible at discon-
nected high-tension lead
, Yes No Service Code No. displayed
Check for cause (Refer to specified
:heck sequence) “88” flashes
Check ECU terminal IF voltage CT page F-150
Specification: Battery voltage
(Ignition switch ON)
3 If OK, replace ECU w page F-149 3 If not OK, check wiring between
ECU and Self-Diaanosis Checker Yes
Go to next step No
Check for cause Yes
Go to Step 8 No
Go to next step
Go to Step 6
Go to Step 5 Yes
No
Yes
No
Yes
No I-
30 to next step w page F-83
0 page F-151
Check if injector resistance is OK c7 page F-131
Resistance: Approx. 12-l 852
c3 If OK, check wiring between ECU
and injector
c3 If not OK, replace injector w page F-131
Check wiring between ECU and injector
Go to next step
Check high-tension lead w page G-17
Q If OK, check distributor cap and
rotor w page G-22
c3 If not OK, replace high-tension lead
F-42

TROUBLESHOOTING GUIDE F
No Replace airflow meter
9
Check for injector operating sound at idle Yes Go to Step 11
No Go to next Step
10 Check if battery voltage exists at injector connec- Yes Check if injector resistance is OK CT page F-131
tor (W/R) wire Resistance: 12-l 6fi
c3 If OK, check wiring between ECU
and injector
c3 If not OK, replace injector CT page F-131
No
Check wiring between ECU and injector
11 Check if strong blue spark is visible at discon-
Yes Go to next step
netted high-tension lead
No Check high-tension lead
+ If OK, check distributor cap and
rotor w page G-22
* If not OK, replace high-tension lead
12
Check if spark plugs are OK Yes Check for correct engine compression CT page Bl-10
w page G-16 82-10
Compression (Minimum):
. BP SOHC
834 kPa (8.5 kg/cm2, 121 psi)300 rpm
BON BUILDUP l BP DOHC
883 kPa (9.0 kg/cm*, 128 psi)-300 rpm
l.O-l.lmm ’ B6 DAMAGE AND 932 kPa (9.5 kg/cm’, 135 psi)-300 rpm DETERIORATION
c3 If OK, go to next step
c13 If not OK, check for cause CT page Bl-10
B2-10
No
Clean or replace w page G-18
13
Check for injector leakage Yes Replace injector CT page F-131
w page F-132
No Go
to next step
14 Try known good ECU and check if condition im-
proves cc7 page F-149
23UOFX-030
F-53

DECHOKE CONTROL SYSTEM t-
DECHOKE CONTROL SYSTEM
DESCRIPTION
To facilitate starting the engine when the spark plugs become fouled, such as when the engine is flooded,
fuel injection is cut if the throttle valve is held wide open while cranking and the engine coolant temperature
is O°C (32OF) or below. This allows the spark oluas to drv and purges excess fuel from the cylinders.
f-- ECU _
. IGNITION SWITCH (START)
l ENGINE SPEED BELOW 500 rpm ’
l THROTTLE VALVE FULLY OPEN
l ENGINE COOLANT TEMPERATURE ;
BELOW
0% (32°F) I FUEL CUT
OBUOFX-19
I / / ‘ I
SYSTEM OPERATION
1.
2. Check if the engine coolant temperature is below O°C
(32OF).
If the engine coolant temperature is above O°C (32OF), dis-
connect the water thermosensor connector and connect an
approx. 10 kB resistor to the connector.
03UOFX.198 3. Turn the ignition switch to START and verify that the injec-
OBUOFX-19! 3
tor operating sound is heard.
4. Depress the accelerator pedal fully and turn the ignition
switch START. Verify that no injector operating sound is
heard.
F-l 45

G
ENGINE ELECTRICAL SYSTEM
INDEX ......................................................
OUTLINE ..................................................
SPECIFICATIONS .................................... G- 3
TROUBLESHOOTING
GUIDE.. .................... G-
4
DIAGNOSTIC INDEX ................................
SYMPTOM TROUBLESHOOTING..
............. :- t
-
CHARGING SYSTEM ................................. G- 6
PREPARATION .......................................
CIRCUIT DIAGRAM ................................. :I ;
TROUBLESHOOTING .............................. G- 7
BATTERY ............................................... G- 6
ALTERNATOR ........................................ G-10
DRIVE BELT ........................................... G-14
IGNITION SYSTEM .................................... G-15
PREPARATION ....................................... G-15
CIRCUIT DIAGRAM ................................. G-15
TROUBLESHOOTING .............................. G-16
IGNITION TIMING ................................... G-17
HIGH-TENSION LEAD .............................. G-17
SPARK PLUGS ....................................... G-16
IGNITION COIL ....................................... G-19
DISTRIBUTOR ........................................ G-20
IGNITER ................................................ G-23
STARTING SYSTEM .................................. G-24
PREPARATION ....................................... G-24
CIRCUIT DIAGRAM ................................. G-24
STARTER ...............................................
G-25
STARTER INTERLOCK SWITCH (MTX)
........ G-31
03UOGX-001