Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1999 1999 Service Manual ENGINE SECTION ENGINE LUBRICATION SYSTEM MSA5TCD99L64

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                                                       DIAGNOSTICS                                            [K100] 2-4
                                                                             1. Engine Lubrication System Trouble in General


1. Engine Lubrication System
Trouble in General
Before troubleshooting, make sure that the engine
oil level is correct and no oil leakage exists.

         Trouble                                            Possible cause                                     Corrective action
                            1) Oil pressure switch      Cracked diaphragm or oil leakage within switch      Replace.
                            failure                     Broken spring or seized contacts                    Replace.
                                                        Clogged oil filter                                  Replace.
                                                        Malfunction of oil by-pass valve of oil filter      Clean or replace.
                                                        Malfunction of oil relief valve of oil pump         Clean or replace.
1. Warning light remains 2) Low oil pressure            Clogged oil passage                                 Clean.
on.                                                     Excessive tip clearance and side clearance of oil
                                                                                                            Replace.
                                                        pump rotor and gear
                                                        Clogged oil strainer or broken pipe                 Clean or replace.
                                                        Insufficient engine oil                             Replenish.
                            3) No oil pressure          Broken pipe of oil strainer                         Replace.
                                                        Stuck oil pump rotor                                Replace.
                            1)   Burn-out bulb                                                              Replace.
2. Warning light does
                            2)   Poor contact of switch contact points                                      Replace.
not go on.
                            3)   Disconnection of wiring                                                    Repair.
                            1)   Poor contact at terminals                                                  Repair.
                            2)   Defective wiring harness                                                   Repair.
3. Warning light flickers
momentarily.                                                                                                Check for the same
                            3) Low oil pressure                                                             possible causes as
                                                                                                            listed in 1.--2)




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2-4     DIAGNOSTICS


MEMO:




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