Mazda 121 Workshop Manual page 202

F
TROUBLESHOOTING GUIDE
SIEF
INSPECTION
ACTION
a Conn€ct Syslem Selector to diagnosis connector
and sel Tesl Swltch to "SELF TEST"
ls Lgnll|on mrng corred at rdle atler wam up?
.j pagc F-42
lgnitlon liming: BTDC 16 + r'
INDICATOF
Does ignition timing advance \,rten
4 lf advances, go lo na)d step
+
tf not advance, replace ECU
rr p.g. F-112
9
ls luel line pressure correct al dle?
E7 page F44
zgs-zzi
xpa (z.t-z.a
*g,fcm', 34-iu) p6i)
Does fuel line pressule decrease
when accaleating quickly?
+
tf decreases, check lor tuel pump
maximum pressure
!? PagG F-91
li OK, check fuel line and lilter for
cbggrng
4
li no decrease, go to n€xt slep
Check tueL line prsssurc by pinchang
+ ll iuel line prcssure qulckly in-
creases, ch€ck pressufa regulalor
+ lf luel line pressure Sradually ln
creases, check for clogging be
lween iuel pump and pressure
rcgu|alol
li not clogged, check luel pump
maximum pressure
c7 P.go F-91
High prcas0ae
Check it tuel ret'rrn line is clogged
4
ll OK, repiace pressure fegulalor e Pag. F-94
+ ll not OK, replace
1 0 Check lor poor connection of lollowing parts
. lgnitef
. Distribuor
. Hish tension lead
. Crrcuit opening relay
. ECU
t l
Try known good EcU and ch€ck il
F-46