SYMPTOM CHART
TROUBLESHOOTING
- Symptom Char
t
If no malfunction code is output and the problem
cannot be confirmed by a basic inspection, pro-
ceed to this cha
rt
and pe
rf
orm troubleshooting
.
This is a cha
rt
of problem symptoms which was
prepared based on the
4A-FE
engine (Sep
.,
1989)*
.
It is meant only to serve as a means of
familiarizing you with basic troubleshooting pro-
cedures, and is by no means complete
. For
actual troubleshooting procedures, refer to the
repair manual for the appropriate engine
.
*Except for models which are equipped with the
lean mixture sensor
.
REFERENCE
1
. The ECU is not included in the list o
f
POSSIBLE CAUSES
. However, if all other
components and circuits check out okay, it
can be concluded that the ECU is probably
at fault
.
2
. Be sure to also check the wiring harness
and connectors when checking the parts
themselves
.
3
. One reason why some problems may not
be detected by the diagnostic system
even when the symptoms do recur is that
they may have occurred outside the
diagnostic system's range of abnormality
detection or the problem not covered by
the diagnostic system may have occurred
.
(See page 132
.
)
SYMPTOM
POSSIBLE CAUS
E
SYSTEM
COMPONENT
PART
TYPE
OF TROUBL
E
Power su
l
s
stem
Ignition switch Poor contact
pp
y
y
EFI main relay
Won't go o
n
Circuit opening relay
Won't go o
n
Fuel pump
Won't operat
e
Fuel system
Injectors
Won't injec
t
Pressure regulator
Fuel pressure too lo
w
Engine does
No initial Fuel filter, fuel line
Clogge
d
not sta
rt
combustion
Cold sta
rt
s
stem
Cold sta
rt
injector
Won't injec
t
y
Sta
rt
injector time SW
Won't go on, stays o
n
Ignite
r
Ignition system
Ignition coil
No sparkin
g
Distributo
r
Electronic contro
l
system
Distributo
r
(
G and NE signals)
G and NE signals no
t
outpu
t
154
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