Mazda 121 Workshop Manual page 190

F
TROUBLESHOOTING
GUIDE
INSPECTION
ACTION
7
ls fuel line pressure cotrect at idle?
c? Page F-94
Frel lih6 pr$sure:
235-275 kPa (2.4-2.A kg/cmz, 34-40 p3l)
Check fuel line pressure while pinch_
+
ll fuel line pressure quickly In.
creas€s, check pressure regulator
+ ll iuel line pressure g€dually in-
creas€s, check tor clogging be_
tween luel pump and pr€ssure
lf not clogged, check iuel pump
maximum prsssure
E7 Page F-91
I
Connect System Selector to diagnoss connector
and set Test Switch to
"SELF TEST
ls ignition liming correct at idle alt€r warm_up?
(7 gage F-€ 2
lgnition llmlng: BIDC 16 + 1'
Go to nexl step
N o
Adjusl ignrtion system
r' Pag€ F-62
9
Disconnect water lhermosensor conneclor
Does englne condition imprcve?
Replace wat€r thermosensor
N o
Try known good ECU and check il
1 0 ls enoine comoression correcP
-
.7 page 8-10
Engine compression (llhlmum):
I,O3O kPa (10.5 kgL/cm', 149 psl)-3lx) rpm
Check engine
r? Page &-10
1 1
ls slrong blue spa visible al each d sconnecled
hgh'tension lead?
c-----,-- \-\
<72oNl #
/
/
Check high'tension lead
.7 page e-23
4 lJ OK, check dislrlbulor cap and
rotor
F page G-23
+
ll not OK, replace high tensron
12 Are spark plugs OK?
s pago G-19
WEAF ANO CAFiBON BUILDUP
(0.039-o.043
BUANS
DETEBIOBATION
Try known good ECU and check
N O
F-34