On-Vehicle Inspection
Turbocharger Diagnostic Flow
If any problem related with turbocharger, such as lack of engine power, poor acceleration, abnormal engine noise or oil leaks, may occur, check the turbocharger according to the procedure as follows.
- Check the assembly between the turbocharger and expansion fitting or the post processing unit.
- Check if a gasket is installed.
- Check if mounting bolts (or nuts) are tightened properly.
- Check if there is a gas leak.
- Check if there is any damage, such as crack, on the parts.
If a gas leak occur as a gasket was not installed or mounting bolts (or nuts) were tightened inadequately, it may cause abnormal engine noise.
If the cause of the problem is detected, retighten the mounting bolts (or nuts) as the specified torque or replace the gasket or damaged parts with new ones if necessary.
- Check the assembly between the turbo manifold module and the cylinder head.
- Check if a gasket is installed.
- Check if the mounting bolts (or nuts) are tightened properly.
- Check if there is a gas leak.
- Check if there is any damage, such as crack, on the parts.
If a gas leak occur as a gasket was not installed or mounting bolts (or nuts) were tightened inadequately, it may cause abnormal engine noise.
If the cause of the problem is detected, retighten the mounting bolts (or nuts) as the specified torque or install a new gasket if necessary.
- Check the turbocharger oil feed pipe and oil drain pipe.
- Check if a gasket is installed.
- Check if the mounting bolts (or nuts) are tightened properly.
- Check if the oil pipes are damaged (bent, crushed, torn or cracked).
If a gas leak occur as a gasket was not installed or mounting bolts (or nuts) were tightened inadequately.
If the oil drain pipe is damaged and clogged, engine oil is not drained smoothly then it may cause oil leaks from the turbocharger.
If the cause of the problem is detected, retighten the mounting bolts (or nuts) as the specified torque or replace the gasket or damaged parts with new ones if necessary.
- Check for oil leaks between center housing and compressor housing.
- Check if the bolts are tightened properly.
- Check if there is an oil leak.
If the O-ring (gasket) between the center housing and the compressor housing is damaged, it may cause oil leaks.
If an oil leak is detected, replace the turbocharger with a new one.
- Check the electronic waste gate actuator (EWGA) rod.
- Check if the EWGA rod setting mark (A).
- Check the EWGA.
- Electric waste gate actuator: Check for movement of the EWGA rod when a forced actuator operating mode is performed by KDS. (Refer to "1.6L DTC guide")
If the actuators are damaged, the engine power will drop and will not accelerate.
If abnormal, replace the turbocharger.
- Check the turbocharger compressor wheel.
- Check if the compressor wheel is damaged (bent or deformed).
- Check if the compressor wheel rotates smoothly.
EX)
If the compressor wheel are damaged, it may cause abnormal noise from the turbocharger and poor acceleration.
If the compressor wheel are damaged or deformed, replace the turbocharger with new ones.
- Check the turbocharger turbine wheel.
- Check if the turbine wheel is damaged (Damaged).
- Check if the turbine wheel rotates smoothly.
EX)
If the turbine wheel are damaged, it may cause abnormal noise from the turbocharger and poor acceleration.
If the turbine wheel are damaged or deformed, replace the turbocharger with new ones.
If any problem is not detected in the turbocharger, check the turbocharger-related parts according to the procedure as follows.
- Check the engine blow-by hose.
- Check if the breather hose is damaged (bent, clogged).
- Check if the positive crankcase ventilation (PCV) valve is clogged.
If the breather hose is bent or clogged, the internal pressure in the engine increases then engine oil is not supplied smoothly to the turbocharger.
So it may cause damage of the turbocharger and oil leaks.
If the cause of the problem is detected, replace the breather hose or the related parts with new ones.
- Check the air intake hose connected to the turbocharger.
- Check if the air intake hose is damaged (bent, crushed, detached or torn).
If a cross-section of the hose diminishes as the air intake hose is bent or crushed, intake air to the turbocharger reduces and the pressure in front of turbocharger drops.
So it may cause damage of the turbocharger and oil leaks. If the air intake hose is detached or torn, a foreign substance goes into the turbocharger and causes damage of it.
If the air intake hose is damaged, replace it with a new one.
- Check the air cleaner.
- Check the air cleaner filter for pollution state.
- Check the air cleaner filter for water influx.
- Check the air cleaner cover for dirtiness.
- heck if the air cleaner filter is a genuine part.
If the air cleaner filter is moistened or polluted excessively or a non-genuine part is used intake air to the turbocharger reduces and the pressure in front of turbocharger drops.
So it may cause damage of the turbocharger and oil leaks.
If the air cleaner filter is moistened or polluted excessively, replace it with a new one.
NOTE: Replace the air cleaner filter according to the maintenance schedule. - Check the intercooler hoses and pipes.
- Check if the intercooler hoses and pipes are connected properly.
- Check if the intercooler hoses and pipes are damaged (bent, detached or torn).
- Check if there is any damage, such as crack, on the intercooler pipes.
- Check if the clamps are positioned in place.
If the intercooler is damaged, the turbocharger may exceed the permissible speed then it may cause damage of the turbocharger.
If the intercooler is damaged, replace them with a new one.
NOTE: Use new clamps when replacing the hoses and pipes. - Check the intercooler.
- Check if the intercooler tubes and tanks are damaged (oil leak or crack).
If the intercooler is damaged, the turbocharger may exceed the permissible speed then it may cause damage of the turbocharger.
If the intercooler is damaged, replace them with a new one.
NOTE: Use new clamps when replacing the intercooler. - Check the engine oil.
- Check the engine oil level.
- Check the engine oil for discoloration, water influx and viscosity degradation.
- Check the engine oil grade.
If the engine oil level is low, amount of engine oil fed to turbocharger reduces then the bearings in the turbocharger may adhere due to insufficient lubrication and cooling.
If the cause of the problem is detected, add or change engine oil.
NOTE: Change the engine oil according to the maintenance schedule. - Check the engine oil pressure.
- Engine oil pressure: Check the oil pressure using an oil pressure gauge after removing the oil pressure switch.
- Check the engine oil screen in the oil pump if the engine oil level is low. Then check the injectors for gas leaks if foreign substances are accumulated on the oil screen.
If the engine oil level is low, amount of engine oil fed to turbocharger reduces then the bearings in the turbocharger may adhere due to insufficient lubrication and cooling.
If the cause of the problem is detected, add or change engine oil.
If foreign substances are accumulated on the oil screen, wash the oil screen and replace the injector's washer with a new one after checking the injectors for gas leaks. Check the engine oil-related parts, such as oil pump, if necessary.
- Check the injectors, sensors, EGR valve, etc.
(Refer to " Self-Diagnosis ")
- Check if the injectors operate properly.
- Sensor current operability, such as air flow measurement sensor (MAFS), intake air temperature sensor (IATS), boost pressure sensor (BPS)
If the injectors, sensors, EGR valve and etc. don't work properly, it may cause lack of engine power
If the cause of the problem is detected, replace the related parts with new ones.