Engine Stalls On Deceleration - Mazda 121 Workshop Manual

TROUBLESHOOTING GUIDE
F
1 5
ENGII{E STALLS ON OECELERATION
DESCATP-
Tro
.Engine unexpectedly stops running wh le deceleraling or aJter decelerallon
. ldle condition nor,ral
rrRouBLEsHooTtNG
H|NTSI
Engine speed drops loo much when releasing accelerator
or poor conneclor connection
d sconnected by deceleralion
O Dashpor misadjusted
@ Fuel cut control mallunclion
@ ldle speed misadjustment
INSPECTION
ACTION
ls rdle conditon normal?
Adjust or perlorm trou bleshoot ng
Nos. 8-11 RoUGH IDLE"
,- pag"
l-?9
ls dashpoi correclly adjustecl?
13 p.ge F-104
Dashpol set speed: 2,500 + 1O0 rpm
3
|s "00" dlspLayed on Seli Diagnosis Checker
with gnltion switch ON?
sYsTEM SELECT:1
r:' page F-67
Mallunclion Code No. dlsplayed
Check ror cause {Befer to sDecified
check sequence)
rj page F-7o
"88" tlashes
Check ECU teminal 1F vollage
u page F-111
Voltage: Approx. t2V
(bnirion switch oN)
+
lr OK, replace ECU
F page F-112
+
ll nol OK, check wring between
ECU and Se r'Diagnosis Checker
Are air bypass sojenoid valves OK?
SOLENOI
voLut
-@-ll
5
Are ECU terminal voliages OK?
(Especialy 1B,2lV,20 and 2\4
G page F-112
Checklor cause
-
page F-115
F-117
F - l 1 9
6
ls there poor connection at eilher ol lollowing?
. lgnilion coil
. lsniter
. Dislribulor
. C rcuit opening relay
. ECU
Try known good ECU
Does condilion improves?
F-41