Mazda 121 Workshop Manual page 176

F
TROUBLESHOOTING GUIDE
INSPECTION
ACTION
Are ECU teminal voltages OK?
lEsDeciallv 1C, 1K,20 and 20)
c7 Page F-112
Check ior cause
- Page F-114
F - l 1 6
5
ls lhere air leakage ol intake ai svstem com-
6
Does engine starts when waler themos€nsor is Chbck water thermosensor
!7 page F-121
7
A'e spark plugs OK?
F Page G-19
WEAF AND CAFBON BUILDUP
(0.039-0.o4i,
BUBNS
AND
DETERIOFAIION
No
Clean, or rep ace
tr- Page G-19
a
ls enoine comorcssion correct?
-
s Page B-10
Enoine comDression: More than 1,030 kPa
(t-o.s rglcr;'. 149 psi)-300 rPm
Try known good EcU and check af
Check engine condition
.? Page B-10
.wofn pston, pislon rings or cylinder
.Defective cylinder head gasket
. Distorled cylindff head
.lmproper valve s€atng
. Valve slickins in Suide
F-20