Subaru 2002 IMPREZA Service Manual page 1338

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
11 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
12 CHECK FUEL LEVEL.
13 CHECK STATUS OF CHECK ENGINE MAL-
FUNCTION INDICATOR LAMP (MIL).
1)Clear the memory using Subaru Select Mon-
itor.
<Ref. to EN(TURBO)-45, Clear Memory
Mode.>
2)Start the engine, and drive the vehicle more
than 10 minutes.
14 CHECK CAUSE OF MISFIRE DIAGNOSED.
15 CHECK AIR INTAKE SYSTEM.
Check
Is the timing belt dislocated
from its proper position?
Is the fuel meter indication
higher than the "Lower" level?
Is the MIL coming on or blink-
ing?
Was the cause of misfire diag-
nosed when the engine is run-
ning?
Is there a fault in air intake sys-
tem?
EN(TURBO)-178
Yes
Repair the installa- Go to step 12.
tion condition of
timing belt. <Ref.
to ME(TURBO)-
48, Timing Belt
Assembly.>
Go to step 13. Replenish the fuel
so fuel meter indi-
cation is higher
than the "Lower"
level. After replen-
ishing fuel; Go to
step 13.
Go to step 15. Go to step 14.
Finish the diag- Repair the poor
nostics operation, contact.
if the engine has
NOTE:
no abnormality.
In this case, repair
the following:
NOTE:
Ex. Remove spark • Poor contact in
plug cord, etc. 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 connector
Repair the air Go to step 16.
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