Mitsubishi Eclipse Workshop Manual page 71

FUEL
- Troubleshooting
13-7
START
1.
Checking trouble symptom
2.
Reading
selfdiagnosis
code
3.
Estimating causes
of
trouble
and
setting check item
4.
Checking engine control unit
input
and output signals
5.
Checking
engine control unit output
signals and actuator operation.
6.
Checking harnesses of
MPI system
components
7.
Checking individual MPI system
components
o
o
TROUBLESHOOTING
(MPr SYSTEM)
EXPLANATION OF TROUBLESHOOTING PROCE-
DURES
The effective troubleshooting procedures
for
troubles
of
the
MPI system are explained in the following.
1.
Checking trouble symptom
.
Reproduce
the problem symptom
and check the
con-
tents of
the
trouble and
the
conditions under which
the
symptom occurs (engine condition,
operating
state,
etc.).
Reading selfdiagnosis code
.
Read
the
selfdiagnosis code and when a fault
code
is output, correct the fault
referring
to the
diagnostic
chart.
Estimating causes of
trouble and setting check item
o
Referring
to
GHECK CHART CtASStFtED
By
pRO&
LEM
SYMPTOMS, determine
the
check items
and
procedures to
be followed.
Checking engine control unit input signals
.
Using a multi-use tester (MUT) or
analyzer, check the
input signals of the engine control
unit.
o
!f lhe input
signals are normal, the sensor input control
is.
judged as normal. Then, check the following items.
Checking engine
control unit output
signals
and
-actuator
operation
o
Using MUT, check the
output signals
of
the
engine
control unit. Also drive the actuator
with the
actuätor
testing function to
check operation of the
actuator.
o
Using
the
analyzer, check
the output
signals
of
the
engine control unit.
.
lf the output
signals of the
engine control unit and the
operation of the actuator
are normal, the actuator
control
is judged as normal. Then, check the following items.
Checking
harnesses
of
MPI
system components
.
lf the
input and output
signals
of the
engine control
unit
are abnormal. check the body
harnesses
of
MPI
system components and
repair.
o
After
repair or replacement. check the input and output
signals of the
engine
control unit
again.
lf
they
are
normal this time. check the input
and output signals of
the next
check item.
Checking individual MPI system components
o
lf
the
body
harnesses are normal but the input
and
output signals
of
the
engine control unit are
abno#'
mal, check
the
MPI system components
individually
and repair or replace as
necessary.
o
After
repair
or
replacement, check
the
input and out-
put
signals
of
the
engine control unit again.
lf
they
are normal this time, check the input and output
sigr
nals
of the
next check item.
ETSCFAL
2.
3.
o
I
4.
5.
6.
I
q
7.
o
a
@Mitgubishi
MotoECorpoEtaon
Apr.
1991
Fttn
E9010