Turbocharger Boost Pressure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
Low turbocharger boost pressure can cause poor engine performance and driveability concerns. The following procedure will test the turbocharger boost pressure.
Causes of low boost pressure include the following:
- Restricted air inlet system
- Leak in charge air cooler system
- Restricted/high pressure drop across charge air cooler
- Damaged turbocharger compressor wheel housing
- Restricted actuator filter
- Turbocharger actuator stuck open
- Excessive exhaust restriction
Causes of excessively high boost pressure include:
- Turbocharger actuator stuck closed
- Turbocharger actuator signal line leaking or damaged
Several Diagnostic Trouble Codes (DTCs) can be set that will indicate high or low system boost levels. There is a DTC for circuit faults relating to the electronically controlled wastegate command valve.
(Refer to EXHAUST SYSTEM/TURBOCHARGER SYSTEM/CHARGE AIR COOLER AND PLUMBING - DIAGNOSIS AND TESTING) for diagnosing of low or high boost pressure due to leaks.