System Inspection

1. Visually inspect the components of the turbocharger system.

Mechanical

^ Air cleaner element conditions.

^ Air duct damage, looseness.

^ Vacuum hose damage, pinching, kinking, poor connections.

^ Wastegate, actuator, or linkage damaged or binding.

^ Oil leakage from turbocharger.

^ Unusual noise with engine operating.

Electrical

^ Damaged connections or insulation.

^ Damaged volume air flow meter.

2. Exercise the wiring and the connectors for the knock control module, Powertrain Cmmontrol module, and other electronic components to detect obvious problems due to looseness, corrosion, or other damage.

3. Check the air and vacuum lines and the connections for looseness, pinching, kinking, misrouting or other obvious causes for malfunction.

4. If a component is suspected as the obvious cause for the malfunction, correct the defect before proceeding.

5. For noise diagnosis, go to PFO1. LP2 - Turbo Wastegate Function

6. If all checks are OK, proceed to the pinpoint tests. LP1 - Turbo Boost Actuator Function