Mazda 121 Workshop Manual page 178

F
TROUBLESHOOTING
GUIDE
TNSPECTtOt{
ACTION
5
O:sconnecl water thermosemor connectori does
Ch€ck water lhermo€ensot
c7 gage F-121
+
It OK, check conn€clions ot waler
themosensot and ECU 20
4 ll not OK, feplace water ther
mosensor
(j PaSe F-121
N o
6
ls 00" displayed on S€lt_Diagnosis
Checker
wnh ionition switch ON?
-
t7 Page F-'67
Mallunction code l{o. disPlayed
Check ior cause {Belel lo specined
check sequerce)
f? Page F_70
"88" llasheg
Check ECU teminal 1F vollage
c7 page F-114
vollage: appror, 12v
(lgnltion switch oN)
4 li OK, replace ECU
!1'PageF-112
+
li nol OK, check wirng between
ECU and Seli'Diagnosis
Checker
7
Are ECU terminal voltag€s OK?
(Especrallv 1C, 20 and 20)
c7 Page F-i12
Check lor cause
- Page F-115
F-l17
F-lt9
8
Try known good ECU and check ii condilion
Replace ECU
F Page F-l 12
Change tuel to another brand
F-22