Subaru Legacy III (2000-2003 year). Manual - part 290
LU(H6DO)-20
LUBRICATION
ENGINE LUBRICATION SYSTEM TROUBLE IN GENERAL
10.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
Possible cause
Corrective action
1. Warning light remains ON.
1) Oil pressure
switch failure
Cracked diaphragm or pressure leakage
within switch
Replace.
Broken spring or seized contacts
Replace.
2) Low oil pressure
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.
Clogged oil passage
Clean.
Tip clearance and side clearance of oil
pump rotor and gear
Replace.
Clogged oil strainer or broken pipe
Clean or replace.
3) No oil pressure
Insufficient engine oil
Replenish.
Broken pipe of oil strainer
Replace.
Oil pump rotor does not rotate.
Replace.
2. Warning light does not go on.
1) Broken line related to bulb
Replace.
2) Poor contact of switch contact points
Replace.
3) Disconnection of wiring
Repair.
3. Warning light flickers momen-
tarily.
1) Poor contact at terminals
Repair.
2) Defective wiring harness
Repair.
3) Low oil pressure
Check for the same possi-
ble causes as listed in
1.—2).