Mazda 121 - Cranks Normally but Hard to Start - When Engine Cold

TROUBLESHOOTING GUIDE
F
CRANKS NORMALLY AUT HARO TO START
-
WHE
E GINE
COLD
DESCRIP.
TION
.Englne
crank al nofmal
speed
but rcquires excossive cranking
lime
before
slarl ng
.
Baltery
n nofmal condition
.
Festarc OK after
wam-uo
.Engrne
runs no.mally at idle
[f
idle cond]tion
is not
OK,
r€ter io
'Rough
ldle'
(Nos.
8-12)l
rrnouBLEsHoollt{G
HtNTsl
O
Air/Fuel m)dure too rich
.Fuel
injeclion convol mal,unction
(Correction
tor coolant lemperature)
.Thermowax
mallunclion
@A1r/Fuel
m xiure roo ean
.Carbon
deposlt ln hol wire
passage
.
Fu€l inj€ction conlrol malfunction
(Coffeclion
ior coolant lemperalure)
@
Poor atom zation
.
Low
RVP
(summer)
fuel b€rng used
INSPECTION
ACTION
ls
"o0
displayed on Sell Diagnosis Ch€cker
wlth ignition switch ON?
17
page
F-67
SYSTEM
SELECT: r
Malfunctlon Code No, displayed
Check
lor
cause Feler 10 soeciti€d
check sequencei
E?
page
F-7O
"88"
llashes
Check
ECU terminal 1F voltage
c7
page
F-'l
14
Voltage: Approx. 12V
(lgnition
switch
ON)
d
ll OK,
replace
ECU
rr
page
F-112
4
ll not OK, check wiing betlveen
ECU and SelfDiagnosis Checbr
2 Are ECU leminal vollages OK?
(Especiaiy
1C.
2D, and 20)
-:r
page
F-112
Check for caus€
c7
page
F-115
F-117
F-lt9
3 Does engine slart easily
when throtlle valve
Check
lhemowar
c7
page
F-85
4
f
OK,
go
to
Srep
5
4
ll
nol
OK,
replace injeclion body
ls there air leakage ol inlake ar system com'
5 ls arr cleaner element clean?
cr
page
F-62
Beplace air
cleaner element
6 Are spark
plugs
OK?
e
page
G-19
WEAB
AND
CAqBON AUILOUP
(0.039-0.043
in)
BUFNS
E AND
DETEFIORATION
F-25