Subaru 2009 IMPREZA Service Manual page 383

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Engine Lubrication System Trouble in General

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.

1) Oil pressure switch

2) Low oil pressure

1. Warning light remains

3) No oil pressure

1) Malfunction of combination meter

2. Warning light does

2) Poor contact of switch contact points

not illuminate.

3) Disconnection of wiring

1) Poor contact of terminals

2) Defective wiring harness

3. Warning light flickers

momentarily.

3) Low oil pressure

Possible cause

Cracked diaphragm or oil leakage within switch

Broken spring or seized contacts

Clogging of oil filter

Malfunction of oil by-pass valve in oil filter

Malfunction of oil relief valve in oil pump

Clogged oil passage

Excessive tip clearance and side clearance of oil

Clogged oil strainer or broken pipe

Insufficient engine oil (degradation, etc.)

Broken pipe of oil strainer

Stuck oil pump rotor

Corrective action

Clean or replace.

Clean or replace.

Check for the same

possible causes as

listed 1. — 2.