Cooling System - Subaru LEGACY 2006 Manual

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Symptoms
3. Low output, hesitation and
poor acceleration
4. Surging
Engine Trouble in General
Problem parts etc.
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
Loosened or cracked vacuum hose
Defective intake manifold gasket
Defective throttle body gasket
Defective PCV valve
Loosened oil filler cap
Dirty air cleaner element
Fuel line Defective fuel pump and relay
Clogged fuel line
Lack of or insufficient fuel
Belt Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective 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)
Lubrication system Incorrect oil pressure

Cooling system

Overheating
Over-cooling
Others Evaporative emission control system malfunction
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
Loosened or cracked vacuum hose
Defective intake manifold gasket
Defective throttle body gasket
Defective PCV valve
Loosened oil filler cap
Dirty air cleaner element
Fuel line Defective fuel pump and relay
Clogged fuel line
Lack of or insufficient fuel
Belt Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective 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)
Cooling system Overheating
Others Evaporative emission control system malfunction
ME(H4SO)-91
MECHANICAL
Possible cause RANK
A
A
A
B
B
B
B
B
A
B
B
C
B
B
B
B
B
C
B
C
A
B
B
C
C
A
A
A
A
A
B
B
B
B
B
B
B
C
B
B
C
C
C
C
C
C
A
B
B
C