1992 MAZDA PROTEGE ignition

TROUBLESHOOTING GUIDE F
20 POOR ACCELERATION
DESCRIP- l Performance poor while accelerating
TION l idle condition normal [TROUBLESHOOTING HINTS)
3 Factors other than engine malfunction @ Air/Fuel mixture too lean
*Clutch slipping l Fuel line pressure decreases l ATX slipping l Fuel injection malfunction
l Brake dragging @ Poor ignition l Low tire pressure
@ Low engine compression
l Incorrect tire size @ Alcohol blended fuel used l Over-loaded
3 Low intake arr amount
*Throttle valve not open fully
*Clogging in intake air system
Check factors other than engine CT Section H
c7 Section
P
ing accelerator fully w page F-l 14
w page F-l 12
Checker with ignition switch ON w page F-83
rminal 1 F voltage w page F-150
Specification: Battery voltage
(Ignition switch ON)
W: SELF TEST c3 If OK, replace ECU w page F-149 r;3 If not OK, check wiring between
ECU and Self-Diagnosis Checker
Clearance between throttle
lever and stopper
0.1 mm (0.004 in)
l.Omm (0.039 in)
O.lmm (0.004 in)
0.6mm (0.024 in)

iTEP INSPECTION ACTION
5 Connect System Selector to diagnosis connector Yes
and set Test Switch to “SELF TEST” and check Check if ignition timing advances when
for correct ignition timing at idle after warm-up accelerating w page F-79
* If advances, go to next step
r3 If not advance, check ECU terminal Ignition timing (BTDC)
voltages l BP DOHC : go--ll” w page F-150 l BP SOHC : 4O-6O
. B6 : 6O-6O
No
Adjust w page F-79
6
Check if ECU terminal voltages are OK
Yes Go to next step w page F-150
No
Check for cause ~7 page F-151
7
Check for correct intake manifold vacuum at idle
Yes Go to next step Intake manifold vacuum:
More than 450 mmHg (17.7 inHg) No
Check for air leakage of intake air sys-
tem components
8 Check for correct fuel line pressure at idle
Yes Check if fuel line pressure decreases w page F-129
when accelerating quickly Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm’, 39-46 psi)
(Vacuum hose to pressure regulator dls-
connected)
d If decreases, check fuel pump
maximum pressure (3‘ page F-126
If OK, check fuel line and filter for
clogging
* If not decrease, go to next step
No Low pressure
Check for fuel line pressure while pinch-
ing fuel return hose
c3 If fuel line pressure quickly in-
creases, check pressure regulator w page F-129
+ If fuel line pressure gradually in-
creases, check for clogging be-
tween fuel pump and pressure
regulator
If not clogged, check fuel pump
maximum pressure w page F-126
High pressure
Check if fuel line is clogged
* If OK, replace pressure regulator w page F-130
c3 If not OK, replace
F-66

TROUBLESHOOTING GUIDE F
21 RUNS ROUGH ON DECELERATION/BACKFIRE
IESCRIP.
*Engine runs rough while decelerating and abnormal combustion occurs in exhaust system
MON l Transaxle in normal condition TROUBLESHOOTING HINTS]
1) Arr/Fuel mixture too rich
l Arr cleaner element clogged
l Fuel injection control malfunctron
(Fuel cut control)
l Injector fuel leakage
*Throttle sensor (IDL terminal) malfunction
l Dashpot malfunctron
er with ignition switch ON
Check ECU terminal 1F voltage w page F-150
Specification: Battery voltage
(Ignition switch ON)
+ If OK, replace ECU w page F-149 6 If not OK, check wiring between
ECU and Self-Diagnosis Checker
----~
Check for cause (Refer to specified
check sequence) w page F-106
SELECT SW: A Vacuum: More than 450 mmHg (17.7 inHg)
tern components
4 Check if air cleaner element is clean Yes
Go to next step w page F-79
No
Replace air cleaner element
5 Check if ECU terminal voltages are OK
Yes Go to next step
MTX...Especially lN, 2A, 2U and 2V
ATX... Especially lT, 3A, 3U and 3V CT page F-150
No Check for cause c=i‘ page F-151
F-69

22 KNOCKING
DESCRIP- *Abnormal combustion accompanied by audible “pinging” noise
I-ION
[TROUBLESHOOTING HINTS]
3 Incorrect ignition timing (Too advanced)
@ Air/Fuel mixture too lean
3 Carbon deposits in cylinder
*Fuel injection amount not correct
3 Overheating
l Fuel line pressure decreases while accelerating
TEP INSPECTION
ACTION
1 Connect System Selector to diagnosis connector
Yes Go to next step
and set Test Switch to “SELF TEST” and check
for correct ignition timing at idle after warm-up
CT page F-79
Ignition timing (BTDC)
l BP DOHC : go-1 1 o l BP SOHC : 4”-6O
’ B6 No
Adjust a page F-79
2 Check if “00” is displayed on Self-Diagnosis
Yes Go to next step
Checker with ignition switch ON
W page F-62
No
Service Code No. displayed
Check for cause (Refer to specified
check sequence) w page F-63
“88” flashes
Check ECU terminal 1F voltage CT page F-150
Specification: Battery voltage
(Ignition switch ON)
c3 If OK, replace ECU w page F-149
W: SELF TEST c3 If not OK, check wiring between
ECU and Self-Diagnosis Checker
3 Check for correct intake manifold vacuum at idle
Yes Go to next step
VaCUUm: More than 450 mmHg (17.7 inHg) No
Check for air leakage of intake air sys-
tem components
4
Check for correct engine compression
Yes Go to next step
w page Bl-10
B2-10
Engine compression (Minimum):
l BP DOHC
883 kPa (9.0 kg/cm’, 128 psi)-300 rpm
l BP SOHC
834 kPa (8.5 kg/cm*, 121 psi)300 rpm
l B6
932 kPa (9.5 kg/cm’, 135 psi)300 rpm No High compression
Check engine condition CI page 81-10
62-l 0 l Carbon deposits
F-71

TROUBLESHOOTING GUIDE F
26 POOR FUEL ECONOMY
DESCRIP-
l Fuel economy unsatisfactory TION
[TROUBLESHOOTING HINTS]
While fuel consumption is drastically increased by city driving, short-run operation, stop and go driving, extended winter
warm-up periods, etc., as opposed to “trip” mileage, an attempt should be made to determine these factors when con-
fronted with “poor mileage” conditions. However, since the operator is not always at fault, the following is offered.
@II Operator depressing accelerator more than usual due to
@ Air/Fuel mixture too rich
low engine power
l Poor ignition *High fuel line pressure
@ Alcohol blended fuel used
*Low intake air amount
l Electronic spark advance control system malfunction @ High vehicle load l Low tire pressure
*Clutch slipping/ATX slipping l Incorrect tire size l Exhaust component restricted l Brake dragging ;TEP
INSPECTION ACTION
1
Check factors other than engine Yes
Go to next step
l Low tire pressure = Section Q 9 Unrecommended tire srze v Section Q l Clutch slipping w Section H l Brake dragging No
0 Section P Repair
l Exhaust component restricted cz= page F-136
2
Check if air hoses are connected correctly - Yes
Go to next step CI page F-109
No
Repair 3
Check if “00” IS displayed on Self-Diagnosis
Yes
Checker with ignition switch ON Go to next step W page F-82 No
SYSTEM SELECT: 1 Service Code No. displayed Check for cause (Refer to specified
check sequence) w page F-63
“88” flashes
Check ECU terminal 1F voltage w page F-150
Specification: Battery voltage
(Ignition switch ON)
* If OK, replace ECU CT= page F-149 e If not OK, check wiring between
ECU and Self-Diagnosis Checker 4
Check for correct intake manifold vacuum at idle
Yes Go to next step Vacuum: More than 450 mmHg (17.7 inHg) No
Check for air leakage at intake air sys-
tem components 5
Check if air cleaner element is clean Yes
Go to next step CT= page F-79
No
Replace air cleaner element
F-75

F TROUBLESHOOTING GUIDE
s
-
Ignition timing (BTDC) l BP DOHC : Q”-11 o l BP SOHC : 4O-6“
Fuel line pressure:
216-265 kPa (2.2-2.7 kg/cm*, 31-36 psi)
INSTALL CLAMPS
hose to pressure
ged or poorly con-
c3 If OK, replace pressure regulator w page F-130
c3 If not OK, repair or replace hose
Fuel line pressure: More than 147 kPa
(1.5 kg/cm*, 21 psi) for 5 min.
INSTALL CLAMPS
23UOFX-041
F-76

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

F SELF-DIAGNOSIS FUNCTION
SELF-DIAGNOSIS FUNCTION
DESCRIPTION
The engine control unit (integrated with the EC-AT control unit) has built-in Self-Diagnosis function the same
as for the previous models. When trouble occurs in the main input devices or output devices, they are indi-
cated and retrieved from the engine control unit (ECU) as service code numbers.
When inspecting for service code(s) memorized in the ECU use the Self-Diagnosis checker and system selector
(SST).
Note
l The ECU constantly checks for malfunction of the in put devices. But, the ECU checks for
malfunction of output devices only in a three second period after the ignition switch is turned
ON and the TEN terminal of the diagnosis connector is grounded.
-
-
INPUT =
SIGNALS-
-
-
- SELF-
DIAGNOSTIC
L!
I-
FUNCTION ENGINE CONTROL
UNIT
j FAIL-SAFE
FUNCTION
I
SYSTEM SELF-DIAGNOSIS
SELECTOR
CHECKER
MIL
(MALFUNCTION
INDICATOR LAMP)