Symptom Chart

Symptom	Possible Sources	Action
Loss of power/performance	Clogged Air Cleaner (ACL) element Loose connections or damage to air intake hoses and tubes Malfunctioning fuel system Poor fuel quality Engine wear (piston rings, valve guides) Turbocharger turbine or compressor wheel damage Damaged exhaust or exhaust leaks at turbocharger housing Obstructed actuator linkage Damaged actuator linkage Actuator operation PCM -- DTC	INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. TIGHTEN the hose clamps. INSPECT for damage and REPAIR as necessary. Refer to Engine Controls - Symptom Charts (Diesel) . DRAIN and FILL with fresh fuel. REPAIR as required. INSPECT the turbocharger. REFER to Check for Free Rotation - On Vehicle . INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as required. INSPECT the turbocharger activator linkage for obstructions. REPAIR as required. INSPECT the turbocharger activator linkage for damage. INSTALL a new turbocharger as necessary. TEST the actuator operation. Refer to Engine Controls - Symptom Charts (Diesel) . REFER to: Electronic Engine Controls .

Symptom	Possible Sources	Action
Excessive oil consumption	Incorrect type or grade of oil Oil in exhaust manifold Clogged Air Cleaner (ACL) element Blocked or restricted turbocharger oil drain tube Damaged or collapsed air intake hoses and tubes Damaged exhaust or exhaust leaks at turbocharger housing to cylinder head Turbocharger oil seals leaking Damaged crankcase ventilation system	DRAIN and FILL with specified oil. REPAIR as required. INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. INSPECT the turbocharger oil drain tube. REPAIR as necessary. TIGHTEN hose clamps. INSPECT for damage and REPAIR as necessary. INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as required. REFER to Turbocharger Internal Oil Leak Test . Visually INSPECT the crankcase ventilation system. REPAIR as necessary.

Symptom	Possible Sources	Action
Excessive noise	Turbocharger compressor air intake pipe leaking Loose connections or damage to air intake hoses and tubes Air leaks at turbine housing, blown joints or damaged exhaust Carbon build up in the turbine housing causing contact with turbine wheel Turbocharger imbalance due to foreign object/damage	REPAIR or INSTALL a new pipe as required. TIGHTEN hose clamps. INSPECT for damage and REPAIR as necessary. INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as required. INSPECT the turbocharger. REFER to Check for Free Rotation - On Vehicle . REPAIR as required. INSPECT the turbocharger. REFER to Check for Free Rotation - On Vehicle .

Symptom	Possible Sources	Action
Engine emits excessive smoke (black/blue/white)	Clogged Air Cleaner (ACL) element Incorrect type or grade of oil Blocked or restricted turbocharger oil drain tube Damaged/restricted or leaking turbocharger compressor air intake pipe Engine wear (piston rings, valve guides) Plugged crankcase ventilation system Turbocharger oil seals leaking	INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. DRAIN and FILL with specified oil. INSPECT the turbocharger oil drain tube. REPAIR as necessary. REPAIR or INSTALL a new pipe as required. REPAIR as required. Visually INSPECT the crankcase ventilation system. REPAIR as necessary. REFER to Turbocharger Internal Oil Leak Test .

Symptom	Possible Sources	Action
External oil leaks or oil tube leaks	Turbocharger oil tube seals and/or oil tube leaking	Visually INSPECT the turbocharger oil tubes and the turbocharger oil tube seals/gaskets.
High pressure turbocharger vanes inoperative		Inspect the turbocharger for oil varnished/stuck turbocharger vanes. REPAIR, to free up stuck turbocharger vanes, run vehicle at freeway speed for 30 minutes. Verify that the turbocharger vanes are no longer stuck and boost is normal. INSTALL a new turbocharger as needed.