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 Malfunctioning turbocharger bypass valve Obstructed wastegate actuator linkage Damaged wastegate actuator linkage Wastegate 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 - Introduction (Except Diesel & Hybrid) . 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. Refer to Engine Controls - Introduction (Except Diesel & Hybrid) . INSPECT the turbocharger wastegate linkage for obstructions. REPAIR as required. INSPECT the turbocharger wastegate linkage for damage. INSTALL a new turbocharger as necessary. TEST the wastegate actuator operation. Refer to Engine Controls - Introduction (Except Diesel & Hybrid) . REFER to: Electronic Engine Controls .

Symptom	Possible Sources	Action
Excessive oil consumption	Incorrect type or grade of oil Oil in exhaust manifolds Clogged Air Cleaner (ACL) element Blocked or restricted turbocharger oil drain tubes 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 Inoperative turbocharger bypass valve(s)	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. Refer to Engine Controls - Introduction (Except Diesel & Hybrid) .

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(s) Damaged/restricted or leaking turbocharger compressor air intake pipe(s) 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
NOTE: The turbocharger oil supply tube is located on the top of the turbocharger. Many leaks from the turbocharger oil supply tube will look like they are turbocharger oil leaks, as the oil will accumulate in the v-band and drip off the bottom of the turbocharger. After replacing the turbocharger oil supply tube, clean the outside of the turbocharger, to avoid false diagnosis of a leaking turbocharger.
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. If a leak is detected in the oil supply or return tubes or connections, locate and rectify the source. Do not install a new turbocharger due to an external oil leak. REPLACE the turbocharger oil tube seals/gaskets and the turbocharger oil tubes as needed.

Symptom	Possible Sources	Action
External coolant leaks or coolant tube leaks	Turbocharger coolant tube seals and/or coolant tube leaking	Visually INSPECT the turbocharger coolant tubes and the turbocharger coolant tube seals/gaskets. If a leak is detected in the coolant supply or return tubes or connections, locate and rectify the source. Do not install a new turbocharger due to an external coolant leak. REPLACE the turbocharger coolant tube seals/gaskets and the turbocharger coolant tubes as needed.