Mazda 121 - Lack of Power

TROUBLESHOOTING GUIDE F
19 LACK OF POWER
DESCBIP-
Ttot{
.Perforrnance
poor
under load when throtlle valve wide open
.
Beduced
maximum
speed
.ldle
condilion nomal
TTROUBLESHOOTING HINTSI
O
Faclors
other lhan enqrne m;runcrion
.Cturch
stipping
.ATX
stipping
.Brake
dragging
.Low
rre
prcssure
.Incorrect
I re
size
@
Low intake air amount
.Throttle
valve nol open
iully
.Clogged
intake
ak system
@
Air/Fuel mlxture loo ean
.Fuel
line
pressure
decreases
.
Fuel lnjection
maltunclion
@
Poor igniton
@
Low engine
compresson
@
Alcoho bended tuel
used
STEP INSPECTION
ACTION
l Check laclors other
than engine
.
c urch slipping l? page
H-3
.
ATX slpprng .?
page
K-10
.
Blake dragging
c7
page
P-5
.
Low tire
pressure
F
page
O-2
NO
2
ls
throltle valve lully opened when
acceleralor
s acceleralor
cab/e correctly
insl,alled r'
page
F-86
4
ll oK, check
lhroltle
valve
4
ll nol
OK,
install
acceleralor cable
corecty
r? page
F-86
3 ls 00 dlsplayed
wilh
gnition
switch
SETECT
SW: A
TESI
SW' SELF TEST
Mallunclion Code tlo. displayed
Check
ior cause
{Refer
lo soecified
check sequence) E7
page
F-70
"88"
llashes
Check
ECU
term nal lF voltage
- page
F-114
Voltag€: Appror. 12V
(lgniiion
swiich ON)
4
lf OK, replace ECU r:7
page
F-112
€
li no
OK, check wiring betw€en
ECU and S€fDiagnos s Checker
Connect Syslem Selector lo
diagnosrs connl
and set Tesl Switch lo
SELF
TEST
ls
gnition
tming corecl
at dle after warm-!
- page
F_
lgnition laming: BTDC
16
*
1.
t\ \\.- \\ \\-*rtriff
'k\\o\\\t\\t
\ -
'"
p?
62
Check
I lgnilion
timing advances
4
ll
advances,
go
!o next step
a
li nol
advance, check
ECU
temi
nalvoliages r?
page
F112
\NN
l.
cNo
(
\S)
a
od
-'fi"
INOICATOF
::
(l
r/
TES
5 A.e ECU leminal
voltages OK?
(Especialy
1K,2M,2K,
and 25)
l?
page
F-112
Check
ior cause r:,
page
F-115
F-117
F-l19
F-47