Subaru Legacy 2003 Service Manual page 1735

MECHANICAL
21.Engine Trouble in General
A: INSPECTION
NOTE:
"RANK" shown in the chart refers to the possibility of reason for the trouble in order ("Very often" to "Rarely")
A — Very often
B — Sometimes
C — Rarely
TROUBLE
1. Engine will not start.
1) Starter does not turn.
2) Initial combustion does
not occur.
3) Initial combustion occur.
ENGINE TROUBLE IN GENERAL
PROBLEM PARTS, ETC.
• Starter
• Battery
• Friction
• Starter
• Engine control system <Ref. to EN(H4DOSTC)-2, Basic Diagnostic Procedure.>
• Fuel line
• Belt
• Compression
• Engine control system <Ref. to EN(H4DOSTC)-2, Basic Diagnostic Procedure.>
• Intake system
• Fuel line
• Belt
• Compression
ME(H4DOSTC)-90
POSSIBLE CAUSE
• Defective battery-to-starter harness
• Defective starter switch
• Defective inhibitor switch or neutral switch
• Defective starter
• Poor terminal connection
• 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
• Lack of or insufficient fuel
• Defective
• Defective timing
• Incorrect valve clearance
• Loosened spark plugs or defective gasket
• Loosened cylinder head bolts or defective gasket
• Improper valve seating
• Defective valve stem
• Worn or broken valve spring
• Worn or stuck piston rings, cylinder and piston
• Incorrect valve timing
• Improper engine oil (low viscosity)
• Defective intake manifold gasket
• Defective throttle body gasket
• Defective fuel pump and relay
• Clogged fuel line
• Lack of or insufficient fuel
• Defective
• Defective timing
• Incorrect valve clearance
• Loosened spark plugs or defective gasket
• Loosened cylinder head bolts or defective gasket
• Improper valve seating
• 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
B
B
B
C
C
C
C
C
B
C
B
B
A
B
B
C
C
B
B
B
C
C
C
C
C
B
C
B
B