Lack Of Power - Mazda 121 Workshop Manual

TROUBLESHOOTING GUIDE
F
1 9
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
N O
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
o d
-'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 - l 1 9
F-47