Subaru 2006 Legacy, Manual

Page: 3105 / 4302

ME(H6DO)- 8 7
Engine Trouble in General
MECHANICAL
4. Surging Engine control system <Ref. to EN(H6DO) (diag)-2, Basic Diagnostic Procedure.> A
Intake system Loosened or cracked intake duct A
Loosened or cracked PCV hose A
Loosened or cracked vacuum hose A
Defective intake manifold gasket B
Defective throttle body gasket B
Defective PCV valve B
Loosened oil filler cap B
Dirty air cleaner element B
Fuel line Defective fuel pump and relay B
Clogged fuel line B
Lack of or insufficient fuel C
Chain Defective timing B
Compression Incorrect valve clearance B
Loosened spark plug or defective gasket C
Loosened cylinder head bolt or defective gasket C
Improper valve sealing C
Defective valve stem C
Worn or broken valve spring C
Worn or stuck piston rings, cylinder and piston C
Incorrect valve timing A
Improper engine oil (low viscosity) B
Trouble of valve lifter C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.) B
Cooling system Over-heating B
Others Evaporative emission control system malfunction C
5. Engine does not return to
idle. Engine control system <Ref. to EN(H6DO) (diag)-2, Basic Diagnostic Procedure.> A
Intake system Loosened or cracked vacuum hose A
Others Stuck or damaged throttle valve A
6. Dieseling (Run-on) Engine control system <Ref. to EN(H6DO) (diag)-2, Basic Diagnostic Procedure.> A
Cooling system Over-heating B
Others Evaporative emission control system malfunction B
Symptom Problem parts etc. Possible cause RANK
asieps_tobira.book 87 ページ ２００９年１０月２６日 月曜日 午前９時１６分