Mazda 121 - Rough Idle;Engine Stalls at Idle - When A;C, P;S, E;L on

TROUBLESHOOTING GUIDE
F
'tl
ROUGII IDLE/E GI
E STALLS
AT IDLE
-
WHEI{ A./C. P/S,
EIL
OI{
DESCRIP.
Ttol{
.Engine
stalls or vibrates excessively at idle when P/S or E/L ON
.AJC,
P/S, headlights,
blower tan and
e{eciric
cooling fan opelale normally
.ldle
condilion is normal when !,/C. P/S
and
E/L are OFF
rrRoualEsHooTtitc
HtNTsl
O
tdle
spe€d control svslem malluncljon
;TEP INSPECTION ACTION
ls
'OO
dlsplayed on
SeliDiagnosis Checker
wilh ignition swilch ON?
F
page
F-€7
SYSTEM
SELECII
I
ll.ltuncllon Code
l{o. displayod
Check
tor
caus€ lRefer
lo soecilied
check sequenc€)
rr
p.ge
F-m
"88"
llasha6
Check
ECU
terminal
1F voltage c?
page
F-ll4
Vollage:
Apprcx. l2V
0gnlrbn
switch
Ol{)
.'
li OK, replace ECU
e
page
F-112
+
ll not
OK, check
wiring belween
ECU and Self-Diagnosis
Check€r
2 Using Sell Diagnosis Ch€cke. Monitor Lampi
are
switches OK
with
ignilion switch ON?
F
pege
F-80
k@tl
NO
Lamp nol
ON or
OFF wllh specl-
fied
swatch
Check ior cause Fefer lo
sDecif ed
check sequence)
tr7
P.ge
F-81
F-82
L.mp alwaF ON
Check
wring
beh{een
ECU lemina
1D and SellDiagoosis Check€r
3 ls air bypass solenoid valve
OK?
.
A/C.....Solenoid valve
@
rr
prge
F-109
.
E/L.....Solenoid valve
@
c7
p.te
F109
.
P/S.....Solenold v.lve
@
r?
page
F-109
AtR
AYPASS SOL.
V.
rf .4
./
(o
lF
//-!hV
q"l'
,&
AIF BYPASS SOL. V,
@
ltl'
Adjust dleup engine speed
s
page
F-64
NO
Replace solenoid valve
F-35