Subaru 2002 IMPREZA Service Manual page 401

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DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft using ST, and align align-
ment mark on crankshaft sprocket with align-
ment mark on cylinder block.
ST 499987500 CRANKSHAFT SOCKET
2 CHECK FUEL LEVEL.
3
CHECK STATUS OF CHECK ENGINE MAL-
FUNCTION INDICATOR LAMP (MIL).
1)Clear the memory using Subaru Select Mon-
itor.
<Ref. to EN(D0HC TURBO)-49, Clear Mem-
ory Mode.>
2)Start the engine, and drive the vehicle more
than 10 minutes.
CHECK CAUSE
OF
MISFIRE DIAGNOSED.
4
5 CHECK AIR INTAKE SYSTEM.
~
Check
5
the timing belt dislocated
rom its proper position?
s the fuel meter indication
bigher than the "Lower" level?
s
the MIL coming
on
or blink-
ng?
Mas the cause of misfire diag-
iosed when the engine is run-
ling?
s
there a fault in air intake sys
em?
Yes
Repair installation
condition of timing
belt. <Ref. to
ME(D0HC
TURBO)-48, Tim-
ing Belt Assem-
bly.>
Go to step 13.
Go to step 15.
Finish diagnostics
operation, if the
engine has no
abnormality.
NOTE:
Ex. Remove the
spark plug cord,
etc.
Repair air intake
system.
NOTE:
Check the follow.
ing items:
Are there air
leaks or air suction
caused by loose or
dislocated nuts
and bolts?
Are there cracks
or any disconnec-
tion of hoses?
No
30
to step 12.
Replenish fuel so
bel meter indica-
tion is higher than
the "Lower" level.
After replenishing
fuel, Go to step 13
So to step 14.
Repair poor con-
tact.
NOTE:
In this case, repai
the following:
Poor contact in
ignitor connector
Poor contact in
ignition coil con-
nector
Poor contact in
fuel injector con-
nector on faulty
cylinders
Poor contact in
ECM connector
Poor contact in
coupling connectc
Go to step 16.
EN(D0HC TURBO)-177