Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 297
EN(H4DOTC)(diag)-412
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
28
CHECK CRANK SPROCKET.
Remove the timing belt cover. <Ref. to ME(STI)-
49, REMOVAL, Timing Belt Cover.> <Ref. to
ME(w/o STI)-47, REMOVAL, Timing Belt
Cover.>
Is the crank sprocket rusted or
does it have broken teeth?
29
CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft using ST, and align the
alignment mark on crank sprocket with align-
ment mark on cylinder block.
ST 499987500
CRANKSHAFT
SOCKET
Is the timing belt dislocated
from its proper position?
30
CHECK FUEL LEVEL.
Is the fuel meter indication
higher than the “Lower” level?
31
CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Clear the memory using the Subaru Select
Monitor or general scan tool. <Ref. to
EN(H4DOTC)(diag)-63, Clear Memory Mode.>
2) Start the engine, and drive the vehicle 10
minutes or more.
Does the malfunction indicator
light illuminate or blink?
32
CHECK CAUSE OF MISFIRE.
Was the cause of misfire identi-
fied when the engine is run-
ning?
Finish diagnostics
operation, if the
engine has no
abnormality.
Repair the poor
contact of connec-
tor.
NOTE:
In this case, repair
the following item:
• Poor contact of
ignition coil con-
nector
• Poor contact of
fuel injector con-
nector on faulty
cylinders
• Poor contact of
ECM connector
• Poor contact of
coupling connector
33
CHECK AIR INTAKE SYSTEM.
Is there any fault in air intake
system?
Repair the 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?
Step
Check
Yes
No