Cranks Normally But Will Not Start (Partial Combustion) - When Engine Cold - Mazda 121 Workshop Manual

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