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INSPECTION

INSPECTION

Before performing diagnostics, make sure 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 oil 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.

Excessive 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.

Stuck oil pump rotor

Replace.

2. Warning light does not go on.

1) Malfunction of combination meter

Replace.

2) Poor contact of switch contact points

Replace.

3) Disconnection of wiring

Repair.

3. Warning light flickers momentarily.

1) Poor contact at terminals

Repair.

2) Defective wiring harness

Repair.

3) Low oil pressure

Check for the same possible causes as listed in 1.— 2).