LUBRICATION(H4DO) > Engine Lubrication System Trouble in General
INSPECTION
Before performing diagnostics, make sure that the engine oil level is correct and no oil leakage exists.
Trouble | Possible cause | Corrective action |
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. | |
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. | |
Clogged oil passage | Clean. | |
Excessive tip clearance and side clearance of oil pump rotor | Replace. | |
Clogged oil strainer or broken pipe | Clean or replace. |
Inspection
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