Symptom Chart
| Symptom | Possible Sources | Action |
|---|---|---|
| Loss of power/performance | Clogged Air Cleaner (ACL) element | INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. |
| Loose connections or damage to air intake hoses and tubes | TIGHTEN the hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Malfunctioning fuel system | Refer to Engine Controls - Symptom Charts . | |
| Poor fuel quality | DRAIN the fuel. FILL with fresh fuel. |
|
| Engine wear (piston rings, valve guides) | REPAIR as needed. | |
| Turbocharger turbine or compressor wheel damage | INSPECT the turbocharger. REFER to Check for Free Rotation - On Vehicle . |
|
| Damaged exhaust or exhaust leaks at turbocharger housing | INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as needed. |
|
| Malfunctioning turbocharger bypass valve | Refer to Engine Controls - Symptom Charts . | |
| Obstructed wastegate actuator linkage | INSPECT the turbocharger wastegate linkage for obstructions. REPAIR as needed. |
|
| Damaged wastegate actuator linkage | INSPECT the turbocharger wastegate linkage for damage. INSTALL a new turbocharger as needed. |
|
| Wastegate actuator operation | TEST the wastegate actuator operation. Refer to Engine Controls - Symptom Charts . | |
| PCM (powertrain control module) - DTC (diagnostic trouble code) | REFER to: Electronic Engine Controls . | |
| Symptom | Possible Sources | Action |
|---|---|---|
| Excessive oil consumption | Incorrect type or grade of oil | DRAIN the oil. FILL with specified oil. |
| Oil in exhaust manifolds | REPAIR as needed. | |
| Clogged Air Cleaner (ACL) element | INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. |
|
| Blocked or restricted turbocharger oil drain tubes | INSPECT the turbocharger oil return tube. 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. REPAIR as needed. |
|
| Damaged or collapsed air intake hoses and tubes | TIGHTEN the hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Damaged exhaust or exhaust leaks at turbocharger housing to cylinder head | INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as needed. |
|
| Turbocharger oil seals leaking | REFER to Turbocharger Internal Oil Leak Test . | |
| Damaged crankcase ventilation system | Visually INSPECT the crankcase ventilation system. REPAIR as needed. |
|
| Symptom | Possible Sources | Action |
|---|---|---|
| Excessive noise | Turbocharger air intake pipe leaking | REPAIR or INSTALL a new pipe as required. |
| Loose connections or damage to air intake hoses and tubes | TIGHTEN the hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Air leaks at turbine housing, blown joints or damaged exhaust | INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as needed. |
|
| Carbon build up in the turbine housing causing contact with turbine wheel | INSPECT the turbocharger. REFER to the Check for Free Rotation - On Vehicle . |
|
| Turbocharger imbalance due to foreign object/damage | REPAIR as needed. | |
| Inoperative turbocharger bypass valve | Refer to Engine Controls - Symptom Charts . | |
| Symptom | Possible Sources | Action |
|---|---|---|
| Engine emits excessive smoke (black/blue/white) | Clogged Air Cleaner (ACL) element | INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. |
| Incorrect type or grade of oil | DRAIN the oil. FILL with specified oil. |
|
| Blocked or restricted turbocharger oil drain tubes | INSPECT the turbocharger oil return tubes. 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. REPAIR as needed. |
|
| Damaged/restricted or leaking turbocharger air intake pipe | REPAIR or INSTALL a new pipe as required. | |
| Engine wear (piston rings, valve guides) | REPAIR as needed. | |
| Plugged crankcase ventilation system | Visually INSPECT the crankcase ventilation system. REPAIR as needed. |
|
| Turbocharger oil seals leaking | REFER to Turbocharger Internal Oil Leak Test . | |
| Symptom | Possible Sources | Action |
|---|---|---|
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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.
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| 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. |