Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 1999-2000 ENGINE SECTION Engine Lubrication System MSA5T0122A27590

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2-4   [K100]                                 DIAGNOSTICS
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            2) Low oil pressure        Clogged oil passage                              Clean.
remains on.                                            Excessive tip clearance and side clearance of
                                                       oil 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 pos-
                            3) Low oil pressure                                                         sible causes as listed in


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