Mazda 121 - 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
No
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