Rough Idle/Engine Stalls At Idle - When A/C, P/S, E/L On - Mazda 121 Workshop Manual

TROUBLESHOOTING GUIDE
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ROUGII IDLE/E GI E STALLS AT IDLE - WHEI{ A./C. P/S, EIL OI{
DESCRIP.
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.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
N O
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, @
l t l '
Adjust dleup engine speed
s page F-64
N O
Replace solenoid valve
F-35