Mazda 121 - Hesitates;Stumbles on Acceleration

TROUBLESHOOTING GUIDE F
17
HESITATESFTUIIBLES
ON
ACCELERATION
DESCND.
TION
.Flat
spot occurs
lug
ater accelerator depressed or
mrld
jerling
occurs during ac.dera on
ITROUBLESHOOTT
G Ht]{TSl
O
Air/Fuel
mxlure
oecom€s
rean
$nen dep.e€srng accelerator
.Fuel
injecllon control malfunction
(Corection
for
accelerating condition)
.Fuel
line
pressure
d€creases
.Spark
advance
conlfol malfunclion
INSPECTION ACTION
1 ls
"00"
display€d on SellDiagnosis
Checker
wilh ignilion siwilch ON?
I.ltuncllon Code l{o, dhplay€d
Check lor cause
(Refer
1o soec'lied
check
sequerce) o
page
F-70
"88"
fl.3hes
Check ECU terminal
1F voliage F
page
F-114
Vollag€: Approx, 12V
(lgnitlon
sw[ch ON]
.>
lf OK, rcplace ECU
ri
pege
F-112
.+
lf not OK, check wiing between
ECIJ and Self-Diagnosis Checker
2 ls there air leakage at iniake
air sygem com-
3 ls arr cleaner elsment cl€an?
tr-
p.ge
F-62
Go
to nen siep
Replace air cleaner elemenl
4 Arc ECU t€rminal 1K,
2M, 20 and 20
voltages
OK?
.?
p.ge
F-l12
Go lo
nexl
step
No Ch€ck
ior
cause
c7
psge
F-1r5
F-117
F-lt9
5 ls lhrotlle linl€ge coreclly inslalled and does
thrcttle valve open frcel',
Cl€an or replace as required any
binding or damaged linkage and ad-
lust
cabl€ dell€ction al inieclion
body e
pag€
F-86
6
ls iuel line
pressure
correct
at
idle?
.?
p.ge
F-94
Fuel
line
preasure
235-275
kPa
(2.4-2.8
tg/cm', 3'F/1()
psD
Does
ltrel llne
pressure
decrease
when acceleruting
qulcklf
.+
li decreases, check luel
line
and
liltef lor clogging
4
lf no decrease,
go
to next slep
Check
tuel line
pressure
whle
pinch-
+
lf luel line
pressufe quickly
iG
creases, check
pres$ire
regulator
+
11luel line
pressure gradually
in'
creases, check
lor
clogging
be
tlve€n
iuel
pump
and
pressurc
r€gulatot
ll not clogged, check
tuel
pump
maximurn
pressure
17
page
F-91
F-43