1992 MAZDA PROTEGE engine

TROUBLESHOOTING GUIDE
18 SURGES WHILE CRUISING
DESCRIP- *Unexpected change in engine speed which is usually repetitive
TION [TROUBLESHOOTING HINTS]
@ Air/Fuel mixture too lean
@ Misfire
3 Poor connection in wiring harness
SYSTEM SELECT:
1 “88” flashes
Check ECU terminal 1F voltage CT= page F-150
Specification: Battery voltage
(Ignition switch ON)
+ If OK, replace ECU w page F-149 4 If not OK, check wiring between
ECU and Self-Diagnosis Checker
check sequence) w page F-106
heck ECU terminal ID voltage CT page F-150
oxygen sensor
F-59

TROUBLESHOOTING GUIDE F
9 LACK OF POWER
_-- --
L L -
ESCRIP- *Performance poor under load when throttle valve wide open
ION *Reduced maximum speed
* Idle condition normal
VtOUBLESHOOTlNG HINTS]
) Factors other than engine malfunction
*Clutch slipping
* ATX slipping
l Brake dragging l Low tire pressure
l Incorrect We size l Overloaded
‘, Low intake air amount @ Air/Fuel mixture too lean
l Fuel line pressure decreases l Fuel injection malfunction
@ Poor ignition
@ Low engine compression
@ Alcohol blended fuel used
l Throttle valve not open fully
*Clogged intake air system
l Low tire pressure CY Section H
CY Section K
cz7 Section P
c7 Section Q
w page F-l 14
CT= page F-l 12
Checker with ignition switch ON
w page F-83
rminal 1F voltage CT 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
Ignition timing (BTDC)
l BP DOHC : 9*-l lo l BP SOHC
: 4O-8O 4 If advances, go to next step
* If not advance, check ECU terminal
w page F-150
F-61

TROUBLESHOOTING GUIDE F
DAMAGE AND
DETERIORATION
Check if resistance of high-tension leads are OK Resistance: 16 kQ per 1 m (3.26 ft)
li;;g
‘&
d No
Replace
.
12 Check if resistance of ignition coil is OK Yes Go to next step c7 page G-19
Resistance (at 20°C [6SaF]):
Primary coil winding . . . . . . . . 0.61-0.99n
Secondary coil winding.... lo-16 kdl
PRIMARY COIL SECONDARY COIL
WINDING
WINDING
No
Replace
13 Check for correct engine compression Yes Go to next step u page Bl-10
92-10 No
Check engine condition ~7 page 81-10
Engine compression: 82-l 0
. BP DOHC
*Worn piston, piston rings or cylinder 663 kPa (9.0 kg/cm2, 126 psi)-300 rpm wall
l BP SOHC l Defective cylinder head gasket 634 kPa (6.5 kg/cm2, 121 psi)-300 rpm l Distorted cylinder head
l 66 l improper valve seating 932 kPa (9.5 kg/cm2, 136 psi)300 rpm *Valve sticking in guide
14 Change fuel and check if condition improves Yes Change fuel to another brand
No SOHC
Go to Step 16 DOHC
Go to next step
F-63

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)

TROUBLESHOOTING GUIDE F
TEP INSPECTION ACTION
9 Check if airflow meter is OK Yes Go to next step
CT page F-168
I. Check if measuring plate moves smoothly
II. Check resistance No Repair or replace
Fc Ei Vc Ez Vs THA
WEAR AND CARBON BUILDUP
DAMAGE AND
DETERIORATION
Resistance (at 20% [68OF]):
Primary coil winding . . . . . . . . 0.81-0.99Q
Secondary coil winding.... IO-16 kQ
PRIMARY COIL SECONDARY COIL
cc;i’ page 81-10
Engine compression (Minimum):
883 kPa (9.0 kg/cm*, 128 psi)-300 rpm
834 kPa (8.5 kg/cm*, 121 psi)-300 rpm
932 kPa (9.5 kg/cm2, 135 psi)-300 rpm *Worn piston, piston rings or cylinder
l Defective cylinder head gasket l Distorted cylinder head
l improper valve seating
*Valve sticking in guide
F-67

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
23 FUEL ODOR
DESCRIP-
*Gasoline odor in cabin
TION [TROUBLESHOOTING HINTS]
@ Poor connection or damaged at fuel system or evaporative emission control system
@ Charcoal canister overflow due to evaporative emission control System malfUnCtiOn
Check for cause (Refer to specified Specification: Battery voltage
(Ignltlon switch ON)
c3 If OK, replace ECU r;+ page F-149 c3 If not OK, check wiring between
ECU and Self-Diagnosis Checker
control) with engine running and throttle valve
opened (Neutral switch connector disconnected)
eck if vacuum is felt
s
23UOFX-029
F-73