Mazda 121 - Symptom Troubleshooting; Cranks Normally but will Not Start

TFOUBLESHOOTING
GUIDE
F
SYMPTOM
TFOUBLESHOOTING
CAANKS NORMALLY BUT WILL ]{OT START fiO
COMBUSTION}
DESCRIP.
Ttotl
.Engine
cranks at normal speed
but shows no sign ol
"fting
.
Bane.y In normal condrtion
.Throttle
valve noi held iully open whiie cranking
(Oechoke
syslem
not
operale)
ITROUBLESHOOTING
HINTSI
Because ol
no
combustDn,
possibly
O
No
spark
.
lgntion control malfunction
.lgnition
sysiem component
mafunction
@
No
iuel inlection
.
Fuel
pump inopefalive
.Injector
inoperative
no
ruei
s
nFLled lo
engrn.
o ro
€1lion
al drl c/l-dar'
€)
Low
ruel line
pressure
@
Low ens,ne
compressioi
@
ECU
power
supply
crrcuit open
@
ECU
ground
c
rcui open
INSPECTTON
acTtor,l
l
ls
svong
blue spark
vsibe
at disconnecled
hgh.
/
>.
/)
Perform Slep
2
4
ll
OK, check rgnton system
(Refer
to lroubleshooiing
''Misfke")
(r
Page
G-17
a
ff not
OK, reler io speciJied
check
seqlence
lor
displayed
code
No. F
Page
F-?0
2
ls 00" displayed on SellDiagnosis
Checker
wlth lgnilLon swilch ON?
ri
page
F-67
Maltunctlon
code No. displayed
Check
lor cause
(Beler
lo specited
check sequence
ior displayed code
No.)
17
Page
F-7o
"88"
flashes
Check
ECU lerm nal lF
vo
tag€
r?
page
F-114
voltage:
Approx. 12v
(lgnillon
switch
ON)
4
ll OK.
replace ECU
ri
page
F-112
+
ll not
OK.
check
wl.ing belween
ECU and Self
Dbgnosis Checker
and ECU lerm nal
18 vollage
3 Rer.ove air c eaner
coveri is fuei iniecled from
injeclor whie cranking engine?
1.5-2.0
Nn
{15-20
crks,13-17 in-rb)
Ch€ck
iollow ng
poinls
.Spark
ptugs r
page
c-19
.
tgnjtion rmrng
E?
pag€
F-63
.Engine
compressiof
c?
page
B-lO
.Warer
thermosensor
-r
page
F-118
(ECU
20 tem nal vollase)
.Fuel
pressure c7
page
F-89
(lr
njected
iuel is
small
ariounl)
.Inlecror
17
page
F-97
(li
njecled fuel
is
small amounl)
Check
for lnjector operating sound
whlle crankng
engrne
+
li OK,
So
lo nexl siep
+
l{ not OK,
go
ro Slep
6
F-17