Mazda 121 - Cranks Normally but will Not Start - after Warm-Up

TROUBLESHOOTING
GUIDE
F
CNANKS
NORMALLY BUT
WILL
OT START
(PARTIAL
CO AUSTIOII)
-
AFTER WARM.UP
DESCBIP.
Tt0ll
.Engine
cranks at nomal
speed and shows
partial
combustion
but will not
continue
lo run
afler
rLrnning and
.8attery
in normal condition
.
Eng
ne slarts
normally when cold
rrRouaLEsHooTtNG
Ht{Tsl
O
Ar/Fu6l nixture too ch
.lnsuftcient
tuel lnjection conlrol
(Corr€ct
on lor coolanl
temperalue)
.lnjeclor
tuel leakase
@
Vapof lock
.Fuel
pressu.e
not held in luel Ine afier ensine stopped
.Hish
RVP
(winler)
luel used in warm weather
INSPECTION
ACTION
1
Connecl
diasnor
GND with
jump€
swilch
ON, then
,'
,/,1{Q
to normal operaling lempera-
;is conneclor terminals F/P and
r wire
ior
3
minrres with ignilion
l# I 64\
JUMPEF
wlFE
---t
Jl l^
@t),x.
\ \
Change luel io anolher brand
ts
2 Connect diagnosis connector
lermlnals F/P and
GND with
jumper
wirei
is
tuei
llne
pressure
cor
r€ct wilh ignition swilch
ON?
rr
page
F-89
235-275
kPa
(2.4-2.a
kg/cln', 3/t-40
psi)
.riupin
wrne
PRESSUFE
FUEL FILTEFi
Check fueL line
pressure
while
pinch'
.+
lf luel llne
pressure quickly
in-
creases, check
presslre
reguiator
a
I luel line
prcssure
gladually
ln
cr€ases, check luel line and filter
for clogging
li not
clogged,
check fuel
purnp
maxirnum
pressure
r7
page
F-91
High
piossure
ls iuel return hose clogged or
res
+
li
OK,
replace
pressure
regulator s
page
F-94
+
li nol
OK,
repair or replace
3 ln same condilion
as Slep 2, is tuel ine
pressure
held after
ignition switch ls lurned OFF?
e
p.ge
F-88
Fuel llne
pressure:
Morc than 147 kPa
('1.5
kg/cm',2t
psi)
for 5 min.
Go to Step 5
Plug outlei of
prcsslre
regulator:
is fuel Ine
pressure
held atler
gnilion
swilch is lurned OFF?
17
page
F-88
Fuel llno
prc3surq
More than !47 kPa
(1.5
kg/cm', 21
psO
for
5
min.
Beplace
pressLrre
regulatof r-
page
F-94
Check fuel
pump
hold
pressure
c7
page
F-84
4
lf
OK, check
inlector ior fuel
leakage F
page
F-96
4
lf nof OK, rcplace
iue
pump
.r
page
F-92
F-21