Subaru 2009 IMPREZA Service Manual page 1160

MECHANICAL
25.Engine Trouble in General
A: INSPECTION
NOTE:
The "RANK" shown in the chart shows the possibilities of the cause of trouble in order from "Very often" to
"Rarely".
A — Very often
B — Sometimes
C — Rarely
Symptom
1. Engine does not start.
1) Starter does not turn.
2) Initial combustion does
not occur.
Engine Trouble in General
Problem parts etc.
Starter
Battery
Friction
Starter
Engine control system <Ref. to EN(H4DOTC)(diag)-2, Basic Diagnostic Procedure.>
Fuel line
Timing belt
Compression
ME(H4DOTC)-102
Possible cause
Defective battery-to-starter harness
Defective starter switch
Defective inhibitor switch
Defective starter
Improper connection of terminal
Run-down battery
Defective charging system
Seizure of crankshaft and connecting rod bearing
Seized camshaft
Seized or stuck piston and cylinder
Defective starter
Defective fuel pump and relay
Clogged fuel line
Lack of fuel or insufficient fuel
Degradation, etc.
Defective timing
Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective cylinder head
gasket
Improper valve sealing
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Improper engine oil (low viscosity)
RANK
B
C
C
B
A
A
B
C
C
C
C
A
A
C
B
B
B
C
C
C
C
C
B
C
B
B