Mazda 121 Workshop Manual page 188

F
TROUBLESHOOTING GUIDE
ls water ihermosensor res slance correc?
Beplace water lhemosensor
r- page F-121
Connecl Syslem Seleclor lo dlagnosis conneclor
and set Test Swtch lo
'SELF TEST when en_
g i n e l s c o d
Does enqine speed decr€ase as engrne warms
Reolace inieclion bodv
F Page F-84
Connect System Se ector to diagnos s connector
and sel Tesi Swllch to
"SELF TEST
ls rqnlron trm ng corect al tdb aner warm upt
ci page F-62
lgnilion tlming: BTDG 16 * 1"
GND
TEST SW
INDICATOFI
Adjust €ntion limlng
G Page F-62
G oaae F-112
Try known good ECU; does conditon improves?
Change tue to anoiher bland
F-32