Mazda 121 - Cranks Normally but will Not Start (Partial Combustion) - When Engine Cold

TROUBLESHOOTING
GUIDE F
CRANKS NOF ALLY BUT W|LL
r,rOT
START
(PART|AL
COtitBUSTtOt{)
-
U,HEN EI{G[{E COLD
DESCN|P.
Tto
.Engine
cranks at normal sp€ed but shows only
parlial
combustion and will not conlinue lo run
.
Batlery in nomal condilion
rrFouBLEsHooTrilc
HtNTsl
O
Air/Fuel mixture loo rich
.
Water lhermosensor malluncllon
O
AidFuel rnixture loo lean
.Fuel
nject
on
control mallunction
(Corection
ror
coolanl
temperature)
.Low
iuel line
pressure
.An
leakage of inlake air system
O
Low ensine compressron
INSPECTION ACTION
1 ls 0O displayed
on SellDiagnosis
Checker
wlth ignilion
switch
ON?
TEST
SWi SELF TEST
Mallunction
Code No. displayed
Check
lor
cause
(Reier
lo soeciiied
check
sequence)
17
page
F-m
"88"
llashes
Check ECU lelmlnal 1F voliage F
page
F-114
Voltage: Appror. 12V
(lgnltlon
switch oN)
a
ll
OK, replace ECIJ c7
page
F-112
4
I nol
OK. check wiring belween
ECU
and S€lf-Diagnosis Checker
?
/\^\_
/
Checf d sr ouror cdp ard rolor c:i
page
G-23
d\<<=F
=I)'b
B\
3 Connect diagnosis connecror letminals F/P and
GND wilh
jumper
wne; s lhere correct luel
line
pressure
with lgnition switch ON?
e
page
F-49
Fuel llne
prossuae:
235-275 kPa
(2.4-2.a
kg/cm', 34-40
psD
PFFSSURE
GAIIGE
'l
t""
otAGNOStS
CONNECTOF
Check luel line
pressure
while
p
nch
+
ll
tuel
line
pressurc quickly
in-
creases, check
pressure
regulalor
-:
il luel
line
pressufe
gradually
in.
creases, check lor clogging
be-
lween tuel
pump
and
pressure
lf not clogged, check luei
pump
max mum
pressure
e
page
F-91
High
pre$ure
ls llel relurn hose clogged
or res,
lricled?
+
ll OK, replace
pressure
regulalor c?
page
F-94
.)
ll not OK, repa.
or
replace
F-19