Engine Lubrication System Symptom Troubleshooting Index

Symptom	Diagnostic procedure	Also check for
Excessive engine oil consumption	Check for oil leaks. Check for worn valve guide(s); or worn valve seal(s) - Refer to: Valve Clearance Adjustment or Valve Inspection . Check for a damaged or worn piston ring(s) - Refer to: Piston, Ring, Pin, and Connecting Rod Inspection or Block and Piston Inspection . Check for damaged or worn engine internal parts (cylinder wall, pistons, etc.) - Refer to: Block and Piston Inspection or Cylinder Bore Honing .	Check the maintenance records as engine oil that is worn out burns off at a higher rate
Low oil pressure warning message displays on	Check the engine oil level - Refer to: Engine Oil Level Check or Engine Oil Replacement . Do the symptom troubleshooting for Low oil pressure warning message displays on .	A wire shorted to ground between the PCM and the oil pressure switch