Engine Lubrication System Trouble In General - Subaru Legacy 2002 Service Manual

ENGINE LUBRICATION SYSTEM TROUBLE IN GENERAL

Lubrication
8. Engine Lubrication System
Trouble in General
A: INSPECTION
Before performing diagnostics, make sure that the engine oil level is correct and no oil leakage exists.
Trouble
1) Oil pressure switch
failure
2) Low oil pressure
1. Warning light remains
on.
3) No oil pressure
1) Burn-out bulb
2. Warning light does
2) Poor contact of switch contact points
not go on.
3) Disconnection of wiring
1) Poor contact at terminals
2) Defective wiring harness
3. Warning light flickers
momentarily.
3) Low oil pressure
S178100
S178100A10
Cracked diaphragm or oil leakage within switch
Broken spring or seized contacts
Clogged oil filter
Malfunction of oil by-pass valve of oil filter
Malfunction of oil relief valve of oil pump
Clogged oil passage
Excessive tip clearance and side clearance of oil
pump rotor and gear
Clogged oil strainer or broken pipe
Insufficient engine oil
Broken pipe of oil strainer
Stuck oil pump rotor
Possible cause
LU-20
Corrective action
Replace.
Replace.
Replace.
Clean or replace.
Clean or replace.
Clean.
Replace.
Clean or replace.
Replenish.
Replace.
Replace.
Replace.
Replace.
Repair.
Repair.
Repair.
Check for the same
possible causes as
listed in 1.—2).