Subaru 2009 IMPREZA Service Manual page 610

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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.
Check
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?
EN(H4SO)(diag)-193
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Tighten the crank-
shaft position sen-
sor installation bolt
securely.
Replace the crank Go to step 3.
sprocket. <Ref. to
ME(H4SO)-56,
Crank Sprocket.>
Repair the installa- Replace the crank-
tion condition of shaft position sen-
timing belt. <Ref. to sor. <Ref. to
ME(H4SO)-49, FU(H4SO)-26,
Timing Belt.> Crankshaft Posi-
tion Sensor.>