Warning light remains ON. | a. Oil pressure switch failure |
 Cracked diaphragm or oil leakage within switch | Replace. |
Broken spring or seized contacts | Replace. |
b. Low oil pressure |
Clogging of oil filter | Replace. |
Malfunction of oil by-pass valve in oil filter | Replace. |
Malfunction of oil relief valve in oil pump | Replace. |
Clogged oil passage | Clean. |
Excessive tip clearance and side clearance of oil pump rotor | Replace. |
Clogged oil strainer or broken pipe | Clean or replace. |
c. No oil pressure |
Insufficient engine oil (degradation, etc.) | Replace. |
Broken pipe of oil strainer | Replace. |
Stuck oil pump rotor | Replace. |
Warning light does not illuminate. | a. Malfunction of combination meter | Replace. |
b. Poor contact of switch contact points | Replace. |
c. Disconnection of wiring | Repair. |
Warning light flickers momentarily. | a. Defective terminal contact | Repair. |
b. Defective wiring harness | Repair. |
c. Oil pressure switch failure |
Cracked diaphragm or oil leakage within switch | Replace. |
Broken spring or seized contacts | Replace. |
d. Low oil pressure |
Clogging of oil filter | Replace. |
Malfunction of oil by-pass valve in oil filter | Replace. |
Malfunction of oil relief valve in oil pump | Replace. |
Clogged oil passage | Clean. |
Excessive tip clearance and side clearance of oil pump rotor | Replace. |
Clogged oil strainer or broken pipe | Clean or replace. |
Engine oil