Mazda 121 - Page 271

CONTBOL SYSTEM
F
Inco]r€ct Yolt.ge
ROOtvl
10,A llse
burned
Op€n c rcuii
in
wi
ng kom ROO|0A
fuse to ECU leminal 14
Main relay mallunclion
(Rel6r
to
page
F-124)
Op€n or short circuit
in wiring lrorn main relay
lo ECU terminal 18
Always 0V
($aner
turns)
.
Open or shori circuit
in wiring lrcm igniton switch
(MTX),
or inhlbitor switch
iAlx)
to ECU terminal lC
Main relay
(FUEL
INJ retay) mallunclion
(Reler
to
page
F-124)
Op€n circuit in wiing
,rom main relay to diagnosls
conneclor terminal
+B
Open or shod circuit
in wiring trom diagnosrs conn€clor
termlnal MEN lo
ECU terminal 1D
Always battery
voltage Poor connection at
ECIJ connector
ECU mallunclion
ECU mallunclion
2.5V
No display on Self-
oiagnosis Checker
Main relay
(FUEL
INJ relay)
malfuncllon
(Reler
lo
pase
F-124)
Open circlit
in wirlng lrom
main relay lo diagnosis
connector teminal +B
''SA
displayed and
.
Open or shorl
circuil in wiing
from diagnosis conneclor
terminal FEN to
ECU termlnal
1F
Always Baliery
voltage Poor connection al
ECu connector
ECU mallunction
.
Shon
circuit in wirinS fiorn
gniter
io ECU teminal
1G
t.4aln relay
{FUEL
INJ relay)
malrunclion
(Befer
to
pase
F-124)
Poor
connection
at ECU
connector
Open ckcuil
in wking lrom cncuit opening
felay
to ECU lerminal 1l
.
Open circuit
in wiing lrom AC
re
ay lo
ECLJ terminal
1J
.
Shon
cncoit ln wirng trom diagnosis
connector ierminalTEN
lo ECU lerminal lK
Always batlery
vonage
.
Open
cncuit in wiins trom
diagnosis conneclor
term nal TEN lo ECU tem|
.
Open cicuil in wirins
lfom diagnosis conneclor
lerminal GND to
ground
AIways 0V or
Approx. 5V
.
Open
or shon circoii in wiring
frcrn
speed
switch
(Seclion
I)to ECU lemi
na
1[,1
Always below
1.ov
(sloplights
OK)
.
Open circuit
in
wiring
lrom s1opllght swilch
to ECU tem
nal 10
P/S
pressurc
switch malluncllon
Geier
to
page
F-125)
Short circuit
in wning lrom
P/S
pressure
switch ECU
terminal 1P
ECU matlunction
Always battery vollage
P/S
pressure
swilch
maltunclion
(Refer
to
page
F
125)
Open ctcuil
in
wking
lrom PA
presslfe
swilch
lo
ECU te|nrinal
'1P
Op€n
circuil in wiring
lrom P/S
prcssure
swilch
to
grcund
F-l 15