Mazda 121 - High Idle Speed after Warm-Up

F
TROUBLESHOOTING
GUIDE
HIGH
IOLE SPEED
AFTEN
WANM"UP
.ldle
spe€d excessive
alter
warm_up
ITROUBLESIIOOTING
HI TSI
EicssJve
inlaks an supph€d
to engne
O
Throttle valve
nol
lully
clos€d
@
ldle spe€d codrol
mallunction
.Thermowax
malfuncton
.Air
bypass solenoid
valve
ON al idle
.
1,./C,
P/S
or
E/L sgnai
senl
lo ECU
ls lhfotle
valve
tully closed
when accelerator
ls
lhrottle
linkage corrcc{y
installed
+
lf OK,
go
to Slep
2
+
ll nol
OK, clean,
adjust or
replace
linkage
Adjust
idle
sp€ed by
iumins
throtlle
!7
page
F_63
Oo€s iast
idle cam
release
throttle levs?
ls
"oo"
displayed
on
SellDiagnosrs
Checker
with lonition
switch ON?
-
-7
paq'e
F-67
lltaltunction
code
tlo. dlspl.yed
Check
lor cause
(Beier
to
sp€cilied
check
sequence)
t-
Pzge
F-7O
"a8"
llashe3
Check
ECU
terminal
1F voltage
e
page
F-114
voltaoe
AoDrox.
12v
-
0initlon
switch
oN)
+
ff OK, feplace
ECU
(?
P.ge
F-112
+
lf
not OK,
check
wiing belween
ECU
and
Selt-Diagnocis
Checker
Adjust
idla speed
by lurning
throt
s
'
r'.
Pagc
F-63
Are ECU
1P, ]R,
15, 1T, lU, 2[,'1,
2Q, 2R, and
2T lerminal
voltages OK?
Chech
tor cause
_7
pag.
F-115
F-117
F-l19
F-38