Subaru 2009 IMPREZA Service Manual page 1407

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK CONDITION OF CRANKSHAFT PO-
SITION SENSOR.
Turn the ignition switch to OFF.
2 CHECK CRANK SPROCKET.
Remove the timing belt cover.
3 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cylin-
der block.
ST 499987500
Is the crankshaft position sen-
sor installation bolt tightened
securely?
Are crank sprocket teeth
cracked or damaged?
Is the timing belt dislocated
from its proper position?
CRANKSHAFT
SOCKET
EN(H4DOTC)(diag)-186
Check Yes
Go to step 2.
Replace the crank
sprocket. <Ref. to
ME(H4DOTC)-60,
Crank Sprocket.>
Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4DOTC)-50,
Timing Belt.>
No
Tighten the crank-
shaft position sen-
sor installation bolt
securely.
Go to step 3.
Replace the crank-
shaft position sen-
sor. <Ref. to
FU(H4DOTC)-32,
Crankshaft Posi-
tion Sensor.>