Mazda 121 Workshop Manual page 200

F
TROUBLESHOOTING GUIDE
t sPEcTto
acfloll
7
Connect Systern Seleclor to diagnosis connector
and set T€st Swilch to 'SELF TEST"
ls ignition timing conect at idle alt€r warm_up?
ri' p.ge F--62
lgnnlon tlmlng: BTOC 16 + l"
INDICATOR
Does ignltion tming advance when
accelerating?
+ ll advances, go lo ne)d step
+
ll not advan6, replace ECU
s pag€ F-112
NO
8
Are arr duct and air hoses correctly installed?
Go to nexl step
NO
R€pair
9
ls exhaust system rest cted?
(t p.ge F-1t7
N O
1 0 Try known good ECU and ch€ck if conditEn
F-44