Turbocharger: Testing and Inspection

DIAGNOSIS AND TESTING - BOOST PRESSURE SENSOR
If the boost pressure sensor fails, the ECM records a DTC into memory and continues to operate the engine in one of the three limp-in modes. When the ECM is operating in this mode, a loss of power will be present, as if the turbocharger was not operating. The best method for diagnosing faults with the boost pressure sensor is with the DRB III(R) scan tool.