Circuit/System Verification

Inspect for Improper routing or connecting of the vacuum hoses on the turbocharger bypass valve solenoid and the turbocharger wastegate solenoid.
Use the scan tool output controls to command the TC Bypass Solenoid ON and OFF. An audible click should be heard and felt.
Set up the scan tool for a snapshot of the induction data list. With the emergency brake on, the vehicle transmission in neutral, and the engine idling, perform a wide open throttle and then quickly release the accelerator. Review the snapshot data. With the RPM increasing the TC Bypass Solenoid parameter should remain commanded ON by the ECM. As soon as the throttle closes the TC Bypass Solenoid should be commanded OFF by the ECM and the Boost Pressure Sensor parameter should decrease drastically at first, and then gradually approach BARO. If the TC bypass valve is stuck shut, there will only be a slow and gradual reduction in the Boost Pressure Sensor parameter.